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EP2818567A1 - White gold alloy, in particular for use in a stone casting method - Google Patents

White gold alloy, in particular for use in a stone casting method Download PDF

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Publication number
EP2818567A1
EP2818567A1 EP14002176.7A EP14002176A EP2818567A1 EP 2818567 A1 EP2818567 A1 EP 2818567A1 EP 14002176 A EP14002176 A EP 14002176A EP 2818567 A1 EP2818567 A1 EP 2818567A1
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EP
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Prior art keywords
weight
gold alloy
alloy
palladium
platinum
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EP14002176.7A
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German (de)
French (fr)
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EP2818567B1 (en
Inventor
Heinz-Günter Schenzel
Thomas Laag
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C Hafner GmbH and Co KG
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C Hafner GmbH and Co KG
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Priority claimed from DE102013010700.8A external-priority patent/DE102013010700B4/en
Priority claimed from DE202013005743.2U external-priority patent/DE202013005743U1/en
Application filed by C Hafner GmbH and Co KG filed Critical C Hafner GmbH and Co KG
Publication of EP2818567A1 publication Critical patent/EP2818567A1/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals
    • C22C5/02—Alloys based on gold

Definitions

  • the invention relates to a white gold alloy suitable in particular for use in a cast-on-cast method, which comprises between 56 and 60% by weight of gold, 25 to 35% by weight of silver, 5 to 10% by weight of zinc and 0.2 to 5 wt .-% palladium.
  • Such a white gold alloy is known. It contains palladium as a whitening agent. This causes the known gold alloy to have an approximately white color.
  • the known white gold alloy in a Stone casting process, ie a casting process for pieces of jewelry, in which the gems, usually diamonds, are included in the jewelry to use, the lowest possible melting temperature of the alloy is necessary, otherwise there is a risk that the miteingegossenen stones during casting to be damaged.
  • the known gold alloy should have a white color as possible, which requires a higher content of bleaching elements such as nickel or palladium.
  • a high proportion of palladium counteracts a low melting interval, since palladium shifts the melting interval of an alloy to higher temperatures than, for. As nickel.
  • the color of a gold alloy and thus also a white gold alloy is characterized by the so-called yellowness index. This goes back to an initiative of the Manufacturing Jewels and Suppliers of America and the World Gold Council. It has developed a color standardization for white gold, which z. B. in the Journal "Gold Bulletin 2005", June 2005, Issue 38/2, pages 55-67 is described. As a white gold alloy is then referred to a gold alloy, which has a yellowness index of less than 32.
  • a dental alloy which has the following composition: 40 to 80% by weight of gold; 15 to 50% by weight of silver; Palladium and platinum together in an amount of from 0 to 20% by weight, in the case that palladium and platinum are present simultaneously, one of these elements is present in a proportion of not more than 4% by weight; a total of 0 to 5 wt .-% of one or more elements from a group containing tin, zinc, indium, gallium, germanium, aluminum, silicon and Bohr; total 0 to 5% by weight of one or more elements from a group containing tantalum, titanium and rhenium; a total of 0 to 5 wt .-% of one or more elements from a group containing rhodium, iridium and rutinium; a total of 0 to 5 wt .-% of one or more elements from a group containing molybdenum, niobium, tungsten,
  • the dental alloy described in the aforementioned document is said to have a yellow-gold color even at a level of 50% by weight of gold. So it has a yellowness index, which is well above a value of 32 and, typically has a Yellowness value between 40 and 60, possesses.
  • the dental gold solders known from this publication should be used for brazing copper-free dental alloys, which in turn have a yellow-golden color. Consequently, the known copper and cadmium-free dental gold solders therefore have a yellowness index which is well above 32.
  • the JP S61-67 731 A describes a dental alloy powder for a kneading and filling material, which 0 to 20 wt .-% palladium, 0 to 5 wt .-% tin, 0 to 10 wt .-% indium, 0 to 10 wt .-% platinum, 0 to 40 wt .-% silver, 0 to 30 wt .-% copper and the remainder gold.
  • Such an alloy in turn has a yellow-gold color, so a yellowness index of well over 32.
  • the US 4,008,080 A describes a copper-free dental gold alloy, which 25 to 40 wt .-% silver, 40 to 60 wt .-% gold, 5 to 20 wt .-% palladium, 0.05 to 0.5 wt .-% iridium, 0 to 6 wt % Indium, 0 to 6 wt% tin, and 0 to 2 Wt .-% zinc, wherein at least 2% of the aforementioned non-noble metal are present.
  • This gold alloy is no white gold alloy.
  • the EP 0 225 483 describes a dental gold alloy for removable bridges. It contains 50 to 61% by weight of gold, 20 to 35% by weight of silver, 10 to 50% by weight of palladium, 0 to 2% by weight of platinum, 0 to 0.2% by weight of iridium and / or Rotinium and 3 to 5 wt .-% zinc. Again, this dental gold alloy has a golden yellow color, so represents no white gold alloy.
  • a white gold alloy of the type mentioned in such a way that the alloy according to the invention is nickel-free or substantially nickel-free and has good processability, in particular due to their melting interval is suitable for a cast-stone process.
  • the white gold alloy contains 0.05 to 5 wt .-% of platinum, and that the proportion of palladium and platinum in total not more than 5 wt .-% is that copper in a proportion of more than 0 wt .-% and 2 wt .-% is present, wherein up to 2 wt .-% of the silver are replaced by the same amount of copper, and that preferably up to 1 wt .-% gallium is present, wherein the Parts by weight of the abovementioned alloy components - apart from customary admixtures and impurities - add up to 100% by weight and that the white gold alloy has a yellowness index of less than 32.
  • a nickel-free white gold alloy is created in an advantageous manner - apart from impurities or unavoidable admixtures, which is particularly suitable for a cast-stone method and a in terms of their mechanical strength, their chemical resistance, as well as their polish at the jewelery made from such an alloy meets the requirements:
  • the alloy of the invention has a hardness between 120 to 150 HV, a yellowness index of ⁇ 32, a melting interval of ⁇ 900 ° and a sufficient oxidation and corrosion resistance.
  • An advantageous development of the invention provides that up to 2% of the zinc present in the alloy according to the invention is replaced by the same proportion of tin. Such a measure has the advantage that the melting temperature is further reduced.
  • a first embodiment provides that the white gold alloy described contains between 56 and 60% by weight gold, preferably 58-59% by weight gold, in particular 58.5% by weight gold, 25-35% by weight silver , preferably 30 wt .-% silver, 5-10 wt .-% zinc, 0.2 to 5 wt .-% palladium and 0.05-5 wt .-% platinum, wherein the aforementioned alloying components - of conventional impurities and unavoidable admixtures - supplement to 100 wt .-%. The proportion of palladium and platinum is in total at most up to 5 wt .-%.
  • the described alloy is obtained by replacing 0.05-5% by weight of palladium with the corresponding amount of platinum in a known alloy containing the abovementioned alloy components gold, silver, zinc and palladium in the abovementioned proportions.
  • the described alloy has a yellowness index between 26 and 30, well below the accepted limit of 32, where an alloy is no longer referred to as white gold.
  • the white gold alloy according to the first embodiment thus contains 56 to 60 wt .-% gold, preferably 58 to 59 wt .-% gold, in particular 58.5 wt .-% gold, in total from 25 to 35 wt .-% of silver and Copper, preferably in total 30 wt .-% silver and copper, wherein copper is present in a proportion of more than 0 and up to 2 wt .-%, 5 wt .-% zinc, 02, to 5 wt .-% palladium and 0.05 to 5 wt .-% of platinum, wherein the aforementioned alloying components - apart from conventional impurities and unavoidable admixtures - add up to 100 wt .-% and the proportion of palladium and platinum in
  • a second embodiment provides that the white gold alloy 58.5 wt .-% gold, 30.5 wt .-% silver, 6 wt .-% zinc, 1 wt .-% gallium, 1 wt .-% tin and 3 wt .-% platinum, wherein the above-mentioned components of the alloy - apart from conventional impurities and admixtures - add up to 100 wt .-%.
  • Such an alloy has an L * value of 91.47 and an a * value of-1.51 and a b * value of 14.45. It has a yellowness index of about 26.5. This is thus well below the value of 32, in which a gold alloy is referred to as white.
  • an alloy in which the above substitution of 3% by weight of the palladium has not been made by 3% by weight of platinum ie an alloy containing 58.5% by weight of gold, 30.5% by weight, has Silver, 6% by weight of zinc, 1% by weight of gallium, 1% by weight of tin and 3% by weight of palladium, has a yellowness index of 30.9, an L * value of about 91, an a * value of about -1.3 and a b * value of about 16.8.
  • the replacement of 3% by weight of palladium by 3% by weight of platinum thus leads to a significant reduction in the yellowness index from about 30.9 to about 26.5.
  • the described white gold alloy, in which 3% by weight of palladium has been replaced by 3% by weight of platinum is thus significantly lighter than the latter.
  • a third embodiment of the invention provides that the white gold alloy 58.5 wt .-% gold, 27.0 wt .-% silver, 1.5 wt .-% palladium, 1.5 wt .-% copper, 7 %
  • zinc 0.5% by weight of gallium, 1% by weight of tin and 3% by weight of platinum, with the abovementioned constituents of the alloy in turn, apart from customary impurities and admixtures 100 wt .-% complete.
  • the color parameters L *, a * and b * are 91.02, -1.09, 15.16.
  • the yellowness index is again below the value of 32 at about 28.2.
  • 3% by weight of palladium was replaced by 3% by weight of platinum.
  • a fourth embodiment of the invention provides that the white gold alloy 58.5 wt .-% gold, 24.7 wt .-% silver, 3 wt .-% palladium, 1.5 wt .-% copper, 8.3 %
  • zinc 1% by weight of gallium and 3% by weight of platinum, with the abovementioned constituents of the alloy, apart from customary impurities and admixtures, being added to 100% by weight.
  • the color parameters L *, a * and b * are 90.9, -0.96, 15.26.
  • the yellowness index is again below the yellowness index of 32, which is regarded as the limit for a white gold alloy.
  • a fifth embodiment of the invention provides that the white gold alloy 58.5 wt .-% gold, 26.5 wt .-% silver, 3 wt .-% palladium, 1.5 wt .-% copper, 7.5 %
  • zinc 1% by weight of gallium and 2% by weight of platinum, with the abovementioned constituents of the alloy, apart from conventional impurities and admixtures, being added to 100% by weight.
  • the color parameters L *, a * and b * are 90.98, -1.02, 15.38.
  • the yellowness index is again below the value of 32 at 28.71. In the alloy described above, 2% by weight of platinum was replaced.
  • a sixth embodiment of the invention provides that the white gold alloy 58.5 wt .-% gold, 28.5 wt .-% silver, 2 wt .-% palladium, 7 wt .-% zinc, 1 wt .-% Gallium and 3 wt .-% platinum, wherein the above-mentioned components of the alloy - apart from conventional impurities and admixtures - add up to 100 wt .-%.
  • the color parameters L *, a * and b * are 90.36, -1.11, 16.08.
  • the yellowness index is again below the value of 32 at 29.95.
  • the proportions of the corresponding alloy components indicated in the second to sixth embodiments are only exemplary examples which are not intended to limit the generality of the foregoing. It is essential that the above-described alloys are obtained by replacing 0.05-5% by weight of palladium with the same amount of platinum with otherwise identical alloying parameters.
  • the described alloys one or more Kornfeiner, such as. As iridium or ruthenium, are added, wherein the added proportions of the grain or the grain replace the corresponding proportion of palladium and / or platinum, so that then the aforementioned alloy components and the proportion of grain refiner (s) - apart from conventional admixtures and impurities - add up to 100% by weight.
  • Kornfeiner such as. As iridium or ruthenium
  • the measures described form a white gold alloy which has a yellowness index which is below the generally accepted index value of 32, in which a white gold alloy is no longer designated as such .
  • the described white gold alloy is characterized by the fact that - what was not to be expected - in such a constellation platinum has a better bleaching effect than palladium. Since platinum has a much higher atomic weight than palladium and therefore, with the same proportion by weight, much fewer atoms become active in the respective alloy, this is surprising. In addition, it has unexpectedly been found that platinum improves the hardness of the described alloys.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)

Abstract

Die Erfindung betrifft eine Weißgold-Legierung, die 56 bis 60 Gew.-% Gold, 25 bis 35 Gew.-% Silber, 5 bis 10 Gew.-% Zink und 0,2 bis 5 Gew.-% Palladium enthält. Erfindungsgemäß ist vorgesehen, dass die Weißgold-Legierung 0,05 bis 5 Gew.-% Platin enthält, und dass der Anteil von Palladium und Platin in Summe höchstens 5 Gew.-% beträgt, dass Kupfer in einem Anteil zwischen von mehr als 0 Gew.-% und 2 Gew.-% vorhanden ist, wobei bis zu 2 Gew.-% des Silbers durch die gleiche Menge von Kupfer ersetzt sind, und dass vorzugsweise bis zu 1 Gew.-% Gallium vorhanden sind, wobei sich die Gewichtsanteile von den Komponenten - von üblichen Beimischungen und Verunreinigungen abgesehen - zu 100 Gew.-% ergänzen, und dass die Weißgold-Legierung einen Yellowness-Index von kleiner als 32 besitzt.The invention relates to a white gold alloy containing 56 to 60 wt .-% gold, 25 to 35 wt .-% silver, 5 to 10 wt .-% zinc and 0.2 to 5 wt .-% palladium. According to the invention, it is provided that the white gold alloy contains 0.05 to 5 wt .-% platinum, and that the proportion of palladium and platinum in total is at most 5 wt .-%, that copper in a proportion between more than 0 wt and up to 2% by weight of the silver are replaced by the same amount of copper, and preferably up to 1% by weight of gallium are present, the weight proportions of Apart from customary admixtures and impurities, the components add up to 100% by weight, and the white gold alloy has a yellowness index of less than 32.

Description

Die Erfindung betrifft eine insbesondere zur Verwendung in einem Steinguss-Verfahren geeignete Weißgold-Legierung, die zwischen 56 und 60 Gew.-% Gold, 25 bis 35 Gew.-% Silber, 5 bis 10 Gew.-% Zink und 0,2 bis 5 Gew.-% Palladium aufweist.The invention relates to a white gold alloy suitable in particular for use in a cast-on-cast method, which comprises between 56 and 60% by weight of gold, 25 to 35% by weight of silver, 5 to 10% by weight of zinc and 0.2 to 5 wt .-% palladium.

Eine derartige Weißgold-Legierung ist bekannt. Sie enthält als Weißmacher Palladium. Dies bewirkt, dass die bekannte Goldlegierung eine annähernd weiße Farbe aufweist. Um eine derartige bekannte Weißgold-Legierung auch in einem Steinguss-Verfahren, also einem Gussverfahren für Schmuckstücke, bei welchem die Edelsteine, in der Regel Diamanten, beim Schmuckgut miteingegossen werden, verwenden zu können, ist eine möglichst niedrige Schmelztemperatur der Legierung notwendig, da ansonsten die Gefahr besteht, dass die miteingegossenen Steine beim Gießen beschädigt werden. Andererseits soll die bekannte GoldLegierung eine möglichst weiße Farbe aufweisen, was einen höheren Gehalt an bleichenden Elementen wie Nickel oder Palladium voraussetzt. Ein hoher Anteil von Palladium wirkt aber einem niedrigen Schmelzintervall entgegen, da Palladium das Schmelzintervall einer Legierung stärker zu höheren Temperaturen verschiebt als z. B. Nickel. Es würde sich daher aus metallurgischen Gründen der Einsatz von Nickel als Ersatz von Palladium anbieten. Die Verwendung von Nickel ist aber bei derartigen Weißgoldlegierungen aus Gründen des Gesundheitsschutzes bedenklich: Von der sog. "Nickel-Verordnung" der Europäischen Kommission wird praktisch ein Verzicht auf Nickel als Legierungskomponente gefordert, da Nickel Allergien hervorrufen kann.Such a white gold alloy is known. It contains palladium as a whitening agent. This causes the known gold alloy to have an approximately white color. To such a known white gold alloy in a Stone casting process, ie a casting process for pieces of jewelry, in which the gems, usually diamonds, are included in the jewelry to use, the lowest possible melting temperature of the alloy is necessary, otherwise there is a risk that the miteingegossenen stones during casting to be damaged. On the other hand, the known gold alloy should have a white color as possible, which requires a higher content of bleaching elements such as nickel or palladium. However, a high proportion of palladium counteracts a low melting interval, since palladium shifts the melting interval of an alloy to higher temperatures than, for. As nickel. For metallurgical reasons, it would therefore offer the use of nickel as a replacement of palladium. However, the use of nickel is questionable in such white gold alloys for reasons of health protection: The so-called "Nickel Regulation" of the European Commission practically calls for a renunciation of nickel as an alloy component since nickel can cause allergies.

Die Farbe einer Goldlegierung und somit auch einer Weißgold-Legierung wird durch den sogenannten Yellowness-Index charakterisiert. Dieser geht auf eine Initiative der Manufacturing Jewels and Suppliers of America und des World Gold Council zurück. Es wurde eine Farbstandardisierung für Weißgold erarbeitet, welche z. B. in der Zeitschrift "Gold Bulletin 2005", Juni 2005, Ausgabe 38/2, Seiten 55-67 beschrieben ist. Als Weißgold-Legierung wird danach eine Goldlegierung bezeichnet, die einen Yellowness-Index von kleiner als 32 besitzt.The color of a gold alloy and thus also a white gold alloy is characterized by the so-called yellowness index. This goes back to an initiative of the Manufacturing Jewels and Suppliers of America and the World Gold Council. It has developed a color standardization for white gold, which z. B. in the Journal "Gold Bulletin 2005", June 2005, Issue 38/2, pages 55-67 is described. As a white gold alloy is then referred to a gold alloy, which has a yellowness index of less than 32.

Aus der US 5 453 290 A ist eine Dentallegierung bekannt, welche folgende Zusammensetzung aufweist: 40 bis 80 Gew.-% Gold; 15 bis 50 Gew.-% Silber; Palladium und Platin in einem Anteil von zusammen von 0 bis 20 Gew.-%, wobei in dem Fall, dass Palladium und Platin gleichzeitig vorhanden sind, eines dieser Elemente in einem Anteil von nicht mehr als 4 Gew.-% vorhanden ist; insgesamt 0 bis 5 Gew.-% eines oder mehrerer Elemente aus einer Gruppe, die Zinn, Zink, Indium, Gallium, Germanium, Aluminium, Silizium und Bohr enthält; insgesamt 0 bis 5 Gew.-% eines oder mehrerer Elemente aus einer Gruppe, die Tantal, Titan und Rhenium enthält; insgesamt 0 bis 5 Gew.-% eines oder mehrerer Elemente aus einer Gruppe, die Rhodium, Iridium und Rutinium enthält; insgesamt 0 bis 5 Gew.-% eines oder mehrerer Elemente aus einer Gruppe, die Molybdän, Niob, Wolfram, Chrom, Kupfer, Kobalt, Nickel und Eisen enthält; insgesamt 0 bis 3 Gew.-% eines oder mehrerer Elemente aus einer Gruppe, die Scandium, Yttrium, Lathan und seltenen Erden enthält. Die in der vorgenannten Druckschrift beschriebene Dentallegierung soll bereits bei einem Anteil von 50 Gew.-% Gold eine gelbgoldene Farbe aufweisen. Sie besitzt also einen Yellowness-Index, der weit über einen Wert von 32 liegt und, typischerweise einen Yellowness-Wert zwischen 40 und 60, besitzt.From the US 5 453 290 A For example, a dental alloy is known which has the following composition: 40 to 80% by weight of gold; 15 to 50% by weight of silver; Palladium and platinum together in an amount of from 0 to 20% by weight, in the case that palladium and platinum are present simultaneously, one of these elements is present in a proportion of not more than 4% by weight; a total of 0 to 5 wt .-% of one or more elements from a group containing tin, zinc, indium, gallium, germanium, aluminum, silicon and Bohr; total 0 to 5% by weight of one or more elements from a group containing tantalum, titanium and rhenium; a total of 0 to 5 wt .-% of one or more elements from a group containing rhodium, iridium and rutinium; a total of 0 to 5 wt .-% of one or more elements from a group containing molybdenum, niobium, tungsten, chromium, copper, cobalt, nickel and iron; a total of 0 to 3 wt .-% of one or more elements from a group containing scandium, yttrium, lathane and rare earths. The dental alloy described in the aforementioned document is said to have a yellow-gold color even at a level of 50% by weight of gold. So it has a yellowness index, which is well above a value of 32 and, typically has a Yellowness value between 40 and 60, possesses.

In der EP 2 636 039 A1 sind kupfer- und kadmiumfreie Dentalgoldlote beschrieben, die 37 Gew.-% Silber, 50 bis 80 Gew.-% Gold, 0 bis 10 Gew.-% Palladium und/oder Platin, 0,05 bis 0,2 Gew.-% Iridium, 0 bis 5 Gew.-% Indium, 0 bis 5 Gew.-% Zinn und 1 bis 4 Gew.-% Zink aufweisen, wobei die Summe der Unedelmetalle maximal 14% und der Gehalt an Zinn und Zink mindestens 5 Gew.-% beträgt. Die aus dieser Druckschrift bekannten Dentalgoldlote sollten zum Verlöten von kupferfreien Dental-Legierungen, die ihrerseits eine gelbgoldene Farbe aufweisen. Demzufolge weisen auch die bekannten kupfer- und kadmiumfreien Dentalgoldlote daher einen Yellowness-Index auf, der weit über 32 liegt.In the EP 2 636 039 A1 copper and cadmium-free dental gold solders are described, the 37 wt .-% silver, 50 to 80 wt .-% gold, 0 to 10 wt .-% palladium and / or platinum, 0.05 to 0.2 wt .-% iridium , 0 to 5 wt .-% indium, 0 to 5 wt .-% tin and 1 to 4 wt .-% zinc, wherein the sum of base metals maximum 14% and the content of tin and zinc at least 5 wt .-% is. The dental gold solders known from this publication should be used for brazing copper-free dental alloys, which in turn have a yellow-golden color. Consequently, the known copper and cadmium-free dental gold solders therefore have a yellowness index which is well above 32.

Die JP S61-67 731 A beschreibt ein dentales Legierungspulver für ein Knet- und Füllmaterial, welches 0 bis 20 Gew.-% Palladium, 0 bis 5 Gew.-% Zinn, 0 bis 10 Gew.-% Indium, 0 bis 10 Gew.-% Platin, 0 bis 40 Gew.-% Silber, 0 bis 30 Gew.-% Kupfer und als Rest Gold aufweist. Auch eine derartige Legierung besitzt wiederum eine gelbgoldene Farbe, also einen Yellowness-Index von weit mehr als 32.The JP S61-67 731 A describes a dental alloy powder for a kneading and filling material, which 0 to 20 wt .-% palladium, 0 to 5 wt .-% tin, 0 to 10 wt .-% indium, 0 to 10 wt .-% platinum, 0 to 40 wt .-% silver, 0 to 30 wt .-% copper and the remainder gold. Such an alloy in turn has a yellow-gold color, so a yellowness index of well over 32.

Die US 4 008 080 A beschreibt eine kupferfreie Dentalgoldlegierung, welche 25 bis 40 Gew.-% Silber, 40 bis 60 Gew.-% Gold, 5 bis 20 Gew.-% Palladium, 0,05 bis 0,5 Gew.-% Iridium, 0 bis 6 Gew.-% Indium, 0 bis 6 Gew.-% Zinn und 0 bis 2 Gew.-% Zink aufweist, wobei wenigstens 2% der vorgenannten Nichtedelmetall vorhanden sind. Auch diese Goldlegierung stellt keine Weißgold-Legierung dar.The US 4,008,080 A describes a copper-free dental gold alloy, which 25 to 40 wt .-% silver, 40 to 60 wt .-% gold, 5 to 20 wt .-% palladium, 0.05 to 0.5 wt .-% iridium, 0 to 6 wt % Indium, 0 to 6 wt% tin, and 0 to 2 Wt .-% zinc, wherein at least 2% of the aforementioned non-noble metal are present. This gold alloy is no white gold alloy.

Die EP 0 225 483 beschreibt eine Dental-Goldlegierung für herausnehmbare Brücken. Sie enthält 50 bis 61 Gew.-% Gold, 20 bis 35 Gew.-% Silber, 10 bis 50 Gew.-% Palladium, 0 bis 2 Gew.-% Platin, 0 bis 0,2 Gew.-% Iridium und/oder Rotinium und 3 bis 5 Gew.-% Zink. Auch diese Dental-Goldlegierung besitzt wiederum eine goldgelbe Farbe, stellt also keine Weißgold-Legierung dar.The EP 0 225 483 describes a dental gold alloy for removable bridges. It contains 50 to 61% by weight of gold, 20 to 35% by weight of silver, 10 to 50% by weight of palladium, 0 to 2% by weight of platinum, 0 to 0.2% by weight of iridium and / or Rotinium and 3 to 5 wt .-% zinc. Again, this dental gold alloy has a golden yellow color, so represents no white gold alloy.

Es ist daher Aufgabe der vorliegenden Erfindung, eine Weißgold-Legierung der eingangs genannten Art derart weiterzubilden, dass die erfindungsgemäße Legierung nickelfrei oder im wesentlichen nickelfrei ist und eine gute Verarbeitbarkeit besitzt, insbesondere aufgrund ihres Schmelzintervalls für ein Steinguss-Verfahren geeignet ist.It is therefore an object of the present invention, a white gold alloy of the type mentioned in such a way that the alloy according to the invention is nickel-free or substantially nickel-free and has good processability, in particular due to their melting interval is suitable for a cast-stone process.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, die Weißgold-Legierung 0,05 bis 5 Gew.-% Platin enthält, und dass der Anteil von Palladium und Platin in Summe höchstens 5 Gew.-% beträgt, dass Kupfer in einem Anteil zwischen von mehr als 0 Gew.-% und 2 Gew.-% vorhanden ist, wobei bis zu 2 Gew.-% des Silbers durch die gleiche Menge von Kupfer ersetzt sind, und dass vorzugsweise bis zu 1 Gew.-% Gallium vorhanden ist, wobei sich die Gewichtsanteile der vorgenannten Legierungskomponenten - von üblichen Beimischungen und Verunreinigungen abgesehen - zu 100 Gew.-% ergänzen, und dass die Weißgold-Legierung einen Yellowness-Index von kleiner als 32 besitzt.This object is achieved according to the invention, the white gold alloy contains 0.05 to 5 wt .-% of platinum, and that the proportion of palladium and platinum in total not more than 5 wt .-% is that copper in a proportion of more than 0 wt .-% and 2 wt .-% is present, wherein up to 2 wt .-% of the silver are replaced by the same amount of copper, and that preferably up to 1 wt .-% gallium is present, wherein the Parts by weight of the abovementioned alloy components - apart from customary admixtures and impurities - add up to 100% by weight and that the white gold alloy has a yellowness index of less than 32.

Durch die erfindungsgemäßen Maßnahmen wird in vorteilhafter Art und Weise eine - von Verunreinigungen oder unvermeidbaren Beimischungen abgesehen-nickelfreie Weißgold-Legierung geschaffen, die insbesondere für ein Steinguss-Verfahren geeignet ist und eine hinsichtlich ihrer mechanischen Belastbarkeit, ihrer chemischen Beständigkeit, sowie ihrer Polierbarkeit den bei der Schmuckanfertigung aus einer derartigen Legierung auftretenden Anforderungen entspricht:The inventive measures a nickel-free white gold alloy is created in an advantageous manner - apart from impurities or unavoidable admixtures, which is particularly suitable for a cast-stone method and a in terms of their mechanical strength, their chemical resistance, as well as their polish at the jewelery made from such an alloy meets the requirements:

Die erfindungsgemäße Legierung weist eine Härte zwischen 120 bis 150 HV, einen Yellowness-Index von <32, ein Schmelzintervall von <900° sowie eine ausreichende Oxidations- und Korrosionsbeständigkeit auf.The alloy of the invention has a hardness between 120 to 150 HV, a yellowness index of <32, a melting interval of <900 ° and a sufficient oxidation and corrosion resistance.

Die erfindungsgemäße Lösung des zugrunde liegenden technischen Problems-der Ersatz von 0,05 bis 5 Gew.-% des in der bekannten Legierung vorhandenen Palladiums durch die gleiche Menge von Platin - ist überraschend, da nicht zu erwarten war, dass Platin eine bessere Bleichwirkung besitzt als Palladium. Platin besitzt nämlich ein viel höheres Atomgewicht als dieses chemische Element. Aus diesem Grund werden deshalb bei gleichen Gewichtsanteilen bei Platin viel weniger Atome in der Legierung wirksam. Außerdem hat sich überraschenderweise gezeigt, dass Platin die Härte der erfindungsgemäßen Legierung effektiver verbessert als Palladium.The inventive solution of the underlying technical problem-the replacement of 0.05 to 5 wt .-% of the present in the known alloy palladium by the same amount of platinum - is surprising, since it was not expected that platinum has a better bleaching effect as palladium. Platinum has a much higher atomic weight than this chemical element. For this reason, with equal proportions by weight of platinum, much fewer atoms in the alloy will be effective. In addition, it has surprisingly been found that platinum improves the hardness of the alloy according to the invention more effectively than palladium.

Bis zu 2 % des in der erfindungsgemäßen Legierung vorhandenen Silbers ist durch den gleichen Anteil von Kupfer ersetzt. Eine derartige Maßnahme besitzt den Vorteil, dass durch die Beimischung von Kupfer die Festigkeit der Weißgold-legierung erhöht wird, ohne die Farbe der erfindungsgemäßen Legierung unerwünscht zu beeinträchtigen.Up to 2% of the silver present in the alloy according to the invention is replaced by the same proportion of copper. Such a measure has the advantage that the strength of the white gold alloy is increased by the addition of copper, without undesirably impairing the color of the alloy according to the invention.

Eine vorteilhafte Weiterbildung der Erfindung sieht vor, dass bis zu 2 % des in der erfindungsgemäßen Legierung vorhandenen Zinks durch den gleichen Anteil von Zinn ersetzt ist. Eine derartige Maßnahme besitzt den Vorteil, dass die Schmelztemperatur weiter gesenkt wird.An advantageous development of the invention provides that up to 2% of the zinc present in the alloy according to the invention is replaced by the same proportion of tin. Such a measure has the advantage that the melting temperature is further reduced.

Weitere vorteilhafte Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche.Further advantageous developments of the invention are the subject of the dependent claims.

Weitere Einzelheiten und Vorteile der Erfindung sind den Ausführungsbeispielen zu entnehmen, die im Folgenden beschrieben werden.Further details and advantages of the invention can be found in the exemplary embodiments which are described below.

Ein erstes Ausführungsbeispiel sieht vor, dass die beschriebene Weißgold-Legierung zwischen 56 und 60 Gew.-% Gold, vorzugsweise 58-59 Gew.-% Gold, insbesondere 58,5 Gew.-% Gold, 25-35 Gew.-% Silber, vorzugsweise 30 Gew.-% Silber, 5-10 Gew.-% Zink, 0,2 bis 5 Gew.-% Palladium und 0,05-5 Gew.-% Platin enthält, wobei sich die vorgenannten Legierungskomponenten - von üblichen Verunreinigungen und unvermeidbaren Beimischungen abgesehen - zu 100 Gew.-% ergänzen. Der Anteil von Palladium und Platin beträgt in Summe höchstens bis 5 Gew.-%.A first embodiment provides that the white gold alloy described contains between 56 and 60% by weight gold, preferably 58-59% by weight gold, in particular 58.5% by weight gold, 25-35% by weight silver , preferably 30 wt .-% silver, 5-10 wt .-% zinc, 0.2 to 5 wt .-% palladium and 0.05-5 wt .-% platinum, wherein the aforementioned alloying components - of conventional impurities and unavoidable admixtures - supplement to 100 wt .-%. The proportion of palladium and platinum is in total at most up to 5 wt .-%.

Die beschriebene Legierung ist dadurch entstanden, dass bei einer bekannten, die vorgenannten Legierungskomponenten Gold, Silber, Zink und Palladium in den vorstehend genannten Anteilen enthaltenen Legierung 0,05-5 Gew.-% Palladium durch den entsprechenden Anteil von Platin ersetzt wurden. Die beschriebene Legierung weist einen Yellowness-Index zwischen 26 und 30 auf, liegt also deutlich unter dem anerkannten Grenzwert von 32, bei dem eine Legierung nicht mehr als Weißgold bezeichnet wird.The described alloy is obtained by replacing 0.05-5% by weight of palladium with the corresponding amount of platinum in a known alloy containing the abovementioned alloy components gold, silver, zinc and palladium in the abovementioned proportions. The described alloy has a yellowness index between 26 and 30, well below the accepted limit of 32, where an alloy is no longer referred to as white gold.

Es ist des weiteren vorgesehen, dass bei dem ersten Ausführungsbeispiel bis zu 2 Gew.-% des in der beschriebenen Weißgold-Legierung enthaltenen Silbers durch Kupfer ersetzt ist. Eine derartige Maßnahme besitzt den Vorteil, dass hierdurch die Festigkeit der beschriebenen Legierung erhöht wird. Die Weißgold-Legierung gemäß dem ersten Ausführungsbeispiel enthält somit 56 bis 60 Gew.-% Gold, vorzugsweise 58 bis 59 Gew.-% Gold, insbesondere 58,5 Gew.-% Gold, in Summe 25 bis 35 Gew.-% Silber und Kupfer, vorzugsweise in Summe 30 Gew.-% Silber und Kupfer, wobei Kupfer in einem Anteil von mehr als 0 und bis zu 2 Gew.-% vorhanden ist, 5 Gew.-% Zink, 02, bis 5 Gew.-% Palladium und 0,05 bis 5 Gew.-% Platin, wobei sich die vorgenannten Legierungskomponenten - von üblichen Verunreinigungen und unvermeidbaren Beimischungen abgesehen - zu 100 Gew.-% ergänzen und der Anteil von Palladium und Platin in Summe höchstens 5 Gew.-% beträgt.It is further provided that in the first embodiment, up to 2 wt .-% of the silver contained in the described white gold alloy is replaced by copper. Such a measure has the advantage that in this way the strength of the described alloy is increased. The white gold alloy according to the first embodiment thus contains 56 to 60 wt .-% gold, preferably 58 to 59 wt .-% gold, in particular 58.5 wt .-% gold, in total from 25 to 35 wt .-% of silver and Copper, preferably in total 30 wt .-% silver and copper, wherein copper is present in a proportion of more than 0 and up to 2 wt .-%, 5 wt .-% zinc, 02, to 5 wt .-% palladium and 0.05 to 5 wt .-% of platinum, wherein the aforementioned alloying components - apart from conventional impurities and unavoidable admixtures - add up to 100 wt .-% and the proportion of palladium and platinum in total amounts to at most 5 wt .-%.

Vorzugsweise ist vorgesehen, dass bis zu 2 Gew.-% des in der Legierung vorhandenen Zinks durch Zinn ersetzt wird. Die Verwendung des vorgenannten chemischen Elements besitzt den Vorteil, dass hierdurch die Schmelztemperatur der Weißgold-Legierung weiter gesenkt wird.It is preferably provided that up to 2% by weight of the zinc present in the alloy is replaced by tin. The use of the aforementioned chemical element has the advantage that it further reduces the melting temperature of the white gold alloy.

Demzufolge sieht ein zweites Ausführungsbeispiel vor, dass die Weißgold-Legierung 58,5 Gew.-% Gold, 30,5 Gew.-% Silber, 6 Gew.-% Zink, 1 Gew.-% Gallium, 1 Gew.-% Zinn und 3 Gew.-% Platin aufweist, wobei sich die von vorgenannten Bestandteilen der Legierung - von üblichen Verunreinigungen und Beimischungen abgesehen - zu 100 Gew.-% ergänzen.Accordingly, a second embodiment provides that the white gold alloy 58.5 wt .-% gold, 30.5 wt .-% silver, 6 wt .-% zinc, 1 wt .-% gallium, 1 wt .-% tin and 3 wt .-% platinum, wherein the above-mentioned components of the alloy - apart from conventional impurities and admixtures - add up to 100 wt .-%.

Eine derartige Legierung weist einen L*-Wert von 91,47 und einen a*-Wert von-1,51 sowie einen b*-Wert von 14,45 auf. Sie besitzt einen Yellowness-Index von ca. 26,5. Dieser liegt also weit unter dem Wert von 32, bei dem eine Goldlegierung als weiß bezeichnet wird.Such an alloy has an L * value of 91.47 and an a * value of-1.51 and a b * value of 14.45. It has a yellowness index of about 26.5. This is thus well below the value of 32, in which a gold alloy is referred to as white.

Vergleichsweise besitzt eine Legierung, bei der die vorstehende Substitution von 3 Gew.-% des Palladiums durch 3 Gew.-% Platin nicht vorgenommen wurde, also eine Legierung, die 58,5 Gew.-% Gold, 30,5 Gew.-% Silber, 6 Gew.-% Zink, 1 Gew.-% Gallium, 1 Gew.-% Zinn und 3 Gew.-% Palladium aufweist, einen Yellowness-Index von 30,9, einen L*-Wert von ca. 91, einen a*-Wert von ca. -1,3 und einen b*-Wert von ca. 16,8. Der Ersatz von 3 Gew.-% Palladium durch 3 Gew.-% Platin führt somit zu einer deutlichen Senkung des Yellowness-Index von ca. 30,9 auf ca. 26,5. Die beschriebene Weißgold-Legierung, bei der 3 Gew.-% Palladium durch 3 Gew.-% Platin ersetzt sind, ist somit deutlich heller als die letztgenannte.By comparison, an alloy in which the above substitution of 3% by weight of the palladium has not been made by 3% by weight of platinum, ie an alloy containing 58.5% by weight of gold, 30.5% by weight, has Silver, 6% by weight of zinc, 1% by weight of gallium, 1% by weight of tin and 3% by weight of palladium, has a yellowness index of 30.9, an L * value of about 91, an a * value of about -1.3 and a b * value of about 16.8. The replacement of 3% by weight of palladium by 3% by weight of platinum thus leads to a significant reduction in the yellowness index from about 30.9 to about 26.5. The described white gold alloy, in which 3% by weight of palladium has been replaced by 3% by weight of platinum, is thus significantly lighter than the latter.

Ein drittes Ausführungsbeispiel der Erfindung sieht vor, dass die Weißgold-Legierung 58,5 Gew.-% Gold, 27,0 Gew.-% Silber, 1,5 Gew.-% Palladium, 1,5 Gew.-% Kupfer, 7 Gew.-% Zink, 0,5 Gew.-% Gallium, 1 Gew.-% Zinn und 3 Gew.-% Platin aufweist, wobei sich die von vorgenannten Bestandteile der Legierung wiederum - von üblichen Verunreinigungen und Beimischungen abgesehen - zu 100 Gew.-% ergänzen. Der Farbparameter L*, a* und b* betragen 91,02, -1,09, 15,16. Der Yellowness-Index liegt mit ca. 28,2 wiederum unter dem Wert von 32. Bei dem vorstehend beschriebenen Ausführungsbeispiel wurden wiederum 3 Gew.-% Palladium durch 3 Gew.-% Platin ersetzt.A third embodiment of the invention provides that the white gold alloy 58.5 wt .-% gold, 27.0 wt .-% silver, 1.5 wt .-% palladium, 1.5 wt .-% copper, 7 % By weight of zinc, 0.5% by weight of gallium, 1% by weight of tin and 3% by weight of platinum, with the abovementioned constituents of the alloy in turn, apart from customary impurities and admixtures 100 wt .-% complete. The color parameters L *, a * and b * are 91.02, -1.09, 15.16. The yellowness index is again below the value of 32 at about 28.2. In the exemplary embodiment described above, in turn, 3% by weight of palladium was replaced by 3% by weight of platinum.

Eine Weißgold-Legierung, die 58 Gew.-% Gold, 27 Gew.-% Silber, 4,5 Gew.-% Palladium - anstelle von 1,5 Gew.-% wie bei dem vorstehend beschriebenen dritten Ausführungsbeispiel - sowie 1,5 Gew.-% Kupfer, 7 Gew.-% Zink, 0 Gew.-% Palladium, 1 Gew.-% Zinn und kein Platin aufweist, besitzt einen Yellowness-Index von ca. 30,3, er liegt also deutlich höher als der Yellowness-Index des beschriebenen Ausführungsbeispiels, der - wie vorstehend ausgeführt - ca. 28,2 beträgt.A white gold alloy containing 58% by weight of gold, 27% by weight of silver, 4.5% by weight of palladium instead of 1.5% by weight as in the third embodiment described above, and 1.5 Wt .-% copper, 7 wt .-% zinc, 0 wt .-% palladium, 1 wt .-% tin and no platinum, has a yellowness index of about 30.3, so it is significantly higher than that Yellowness index of the described embodiment, which - as stated above - is approximately 28.2.

Ein viertes Ausführungsbeispiel der Erfindung sieht vor, dass die Weißgold-Legierung 58,5 Gew.-% Gold, 24,7 Gew.-% Silber, 3 Gew.-% Palladium, 1,5 Gew.-% Kupfer, 8,3 Gew.-% Zink, 1 Gew.-% Gallium und 3 Gew.-% Platin aufweist, wobei sich die von vorgenannten Bestandteile der Legierung - von üblichen Verunreinigungen und Beimischungen abgesehen - zu 100 Gew.-% ergänzen. Der Farbparameter L*, a* und b* betragen 90,9, -0,96, 15,26. Der Yellowness-Index liegt mit ca. 28,5 wiederum unter dem als Grenzwert für eine Weißgold-Legierung angesehenen Yellowness-Index von 32.A fourth embodiment of the invention provides that the white gold alloy 58.5 wt .-% gold, 24.7 wt .-% silver, 3 wt .-% palladium, 1.5 wt .-% copper, 8.3 % By weight of zinc, 1% by weight of gallium and 3% by weight of platinum, with the abovementioned constituents of the alloy, apart from customary impurities and admixtures, being added to 100% by weight. The color parameters L *, a * and b * are 90.9, -0.96, 15.26. At around 28.5, the yellowness index is again below the yellowness index of 32, which is regarded as the limit for a white gold alloy.

Zum Vergleich: Eine Legierung, die 58,5 Gew.-% Gold, 24,5 Gew.-% Silber, 6 Gew.-% Palladium, 1,5 Gew.-% Kupfer, 8,3 Gew.-% Zink, 1 Gew.-% Gallium, aber kein Platin aufweist, besitzt einen Yellowness-Index von ca. 32,6. Während die Legierung gemäß dem vierten Ausführungsbeispiel mit einem Yellowness-Index von ca. 28,5 eindeutig von ihrer Farbe her als Weißgold-Legierung zu klassifizieren ist, liegt die letztgenannte, "bekannte" Legierung, bei der keine Substitution von Palladium durch Platin stattgefunden hat, mit einem Yellowness-Index von ca. 32,6 bereits über dem als Grenzwert angesehenen Yellowness-Index von 32.For comparison: an alloy containing 58.5% by weight of gold, 24.5% by weight of silver, 6% by weight of palladium, 1.5% by weight of copper, 8.3% by weight of zinc, 1 wt .-% gallium, but no platinum, has a yellowness index of about 32.6. While the alloy according to the fourth embodiment having a yellowness index of about 28.5 is clearly to be classified in terms of color as a white gold alloy, the latter, "known" alloy, in which no substitution of palladium by platinum has taken place , with a yellowness index of approximately 32.6, is already above the threshold Yellowness Index of 32.

Ein fünftes Ausführungsbeispiel der Erfindung sieht vor, dass die Weißgold-Legierung 58,5 Gew.-% Gold, 26,5 Gew.-% Silber, 3 Gew.-% Palladium, 1,5 Gew.-% Kupfer, 7,5 Gew.-% Zink, 1 Gew.-% Gallium und 2 Gew.-% Platin aufweist, wobei sich die von vorgenannten Bestandteile der Legierung - von üblichen Verunreinigungen und Beimischungen abgesehen - zu 100 Gew.-% ergänzen. Der Farbparameter L*, a* und b* betragen 90,98, -1,02, 15,38. Der Yellowness-Index liegt mit 28,71 wiederum unter dem Wert von 32. Bei der vorstehend beschriebenen Legierung wurden 2 Gew.-% Platin ersetzt. Eine Legierung die 58,5 Gew.-% Gold, 26,5 Gew.-% Silber, 5 Gew.-% Palladium, 1,5 Gew.-% Kupfer, 7,5 Gew.-% Zink und 1 Gew.-% Gallium, aber kein Platin aufweist, besitzt einen Yellowness-Index von ca. 30,3.A fifth embodiment of the invention provides that the white gold alloy 58.5 wt .-% gold, 26.5 wt .-% silver, 3 wt .-% palladium, 1.5 wt .-% copper, 7.5 % By weight of zinc, 1% by weight of gallium and 2% by weight of platinum, with the abovementioned constituents of the alloy, apart from conventional impurities and admixtures, being added to 100% by weight. The color parameters L *, a * and b * are 90.98, -1.02, 15.38. The yellowness index is again below the value of 32 at 28.71. In the alloy described above, 2% by weight of platinum was replaced. An alloy containing 58.5% by weight of gold, 26.5% by weight of silver, 5% by weight of palladium, 1.5% by weight of copper, 7.5% by weight of zinc and 1% by weight of gold. % Gallium, but has no platinum, has a yellowness index of about 30.3.

Ein sechstes Ausführungsbeispiel der Erfindung sieht vor, dass die Weißgold-Legierung 58,5 Gew.-% Gold, 28,5 Gew.-% Silber, 2 Gew.-% Palladium, 7 Gew.-% Zink, 1 Gew.-% Gallium und 3 Gew.-% Platin aufweist, wobei sich die von vorgenannten Bestandteile der Legierung - von üblichen Verunreinigungen und Beimischungen abgesehen - zu 100 Gew.-% ergänzen. Der Farbparameter L*, a* und b* betragen 90,36, -1,11, 16,08. Der Yellowness-Index liegt bei 29,95 wiederum unter dem Wert von 32.A sixth embodiment of the invention provides that the white gold alloy 58.5 wt .-% gold, 28.5 wt .-% silver, 2 wt .-% palladium, 7 wt .-% zinc, 1 wt .-% Gallium and 3 wt .-% platinum, wherein the above-mentioned components of the alloy - apart from conventional impurities and admixtures - add up to 100 wt .-%. The color parameters L *, a * and b * are 90.36, -1.11, 16.08. The yellowness index is again below the value of 32 at 29.95.

Die bei dem zweiten bis sechsten Ausführungsbeispiel angegebenen Anteile der entsprechenden Legierungskomponenten stellen nur exemplarische Beispiele dar, welche die Allgemeinheit der vorstehenden Ausführungen nicht beschränken sollen. Wesentlich ist, dass die vorstehend beschriebenen Legierungen dadurch erhalten werden, dass bei ansonsten gleichen Legierungsparametern 0,05-5 Gew.-% Palladium durch die gleiche Menge von Platin ersetzt werden.The proportions of the corresponding alloy components indicated in the second to sixth embodiments are only exemplary examples which are not intended to limit the generality of the foregoing. It is essential that the above-described alloys are obtained by replacing 0.05-5% by weight of palladium with the same amount of platinum with otherwise identical alloying parameters.

Vorzugsweise kann vorgesehen sein, dass den beschriebenen Legierungen ein oder mehrere Kornfeiner, wie z. B. Iridium oder Ruthenium, beigefügt sind, wobei die hinzugefügten Anteile des oder der Kornfeiner den entsprechenden Anteil von Palladium und/oder Platin ersetzen, so dass sich dann die vorgenannten Legierungskomponenten sowie der Anteil des oder der Kornfeiner - von üblichen Beimischungen und Verunreinigungen abgesehen - zu 100 Gew.-% ergänzen.Preferably, it can be provided that the described alloys one or more Kornfeiner, such as. As iridium or ruthenium, are added, wherein the added proportions of the grain or the grain replace the corresponding proportion of palladium and / or platinum, so that then the aforementioned alloy components and the proportion of grain refiner (s) - apart from conventional admixtures and impurities - add up to 100% by weight.

Zusammenfassend ist festzuhalten, dass durch die beschriebenen Maßnahmen eine Weißgold-Legierung ausgebildet wird, die einen Yellowness-Index aufweist, der unter dem allgemein als Grenzwert anerkannten Index-Wert von 32, bei dem eine Weißgold-Legierung nicht mehr als solche bezeichnet wird, liegt. Die beschriebene Weißgold-Legierung zeichnet sich dadurch aus, dass -was nicht zu erwarten war - bei einer derartigen Konstellation Platin eine bessere Bleichwirkung besitzt als Palladium. Da Platin ein viel höheres Atomgewicht als Palladium besitzt und deshalb bei gleichem Gewichtsanteil viel weniger Atome in der jeweiligen Legierung wirksam werden, ist dies überraschend. Außerdem hat sich unerwarteterweise gezeigt, dass Platin die Härte der beschriebenen Legierungen verbessert.In summary, it should be noted that the measures described form a white gold alloy which has a yellowness index which is below the generally accepted index value of 32, in which a white gold alloy is no longer designated as such , The described white gold alloy is characterized by the fact that - what was not to be expected - in such a constellation platinum has a better bleaching effect than palladium. Since platinum has a much higher atomic weight than palladium and therefore, with the same proportion by weight, much fewer atoms become active in the respective alloy, this is surprising. In addition, it has unexpectedly been found that platinum improves the hardness of the described alloys.

Claims (10)

Weißgold-Legierung, die 56 bis 60 Gew.-% Gold, 25 bis 35 Gew.-% Silber, 5 bis 10 Gew.-% Zink und 0,2 bis 5 Gew.-% Palladium enthält, dadurch gekennzeichnet, dass die Weißgold-Legierung 0,05 bis 5 Gew.-% Platin enthält, und dass der Anteil von Palladium und Platin in Summe höchstens 5 Gew.-% beträgt, dass Kupfer in einem Anteil zwischen von mehr als 0 Gew.-% und 2 Gew.-% vorhanden ist, wobei bis zu 2 Gew.-% des Silbers durch die gleiche Menge von Kupfer ersetzt sind, und dass vorzugsweise bis zu 1 Gew.-% Gallium vorhanden sind, wobei sich die Gewichtsanteile von den Komponenten - von üblichen Beimischungen und Verunreinigungen abgesehen - zu 100 Gew.-% ergänzen, und dass die Weißgold-Legierung einen Yellowness-Index von kleiner als 32 besitzt.White gold alloy containing 56 to 60% by weight of gold, 25 to 35% by weight of silver, 5 to 10% by weight of zinc and 0.2 to 5% by weight of palladium, characterized in that the white gold Alloy contains from 0.05 to 5% by weight of platinum, and in that the proportion of palladium and platinum in total is at most 5% by weight, that copper is present in an amount of between more than 0% by weight and 2% by weight. -% is present, wherein up to 2 wt .-% of the silver are replaced by the same amount of copper, and that preferably up to 1 wt .-% gallium are present, wherein the weight fractions of the components - of conventional admixtures and Contaminants - add up to 100 wt .-%, and that the white gold alloy has a yellowness index of less than 32. Weißgold-Legierung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass bis zu 2 Gew.-% des Zinks durch die gleiche Menge von Zinn ersetzt sind.White gold alloy according to any one of the preceding claims, characterized in that up to 2% by weight of the zinc is replaced by the same amount of tin. Weißgold-Legierung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Weißgold-Legierung 58 bis 59 Gew.-% Gold, insbesondere 58,5 Gew.-% Gold enthält.White gold alloy according to one of the preceding claims, characterized in that the white gold alloy contains 58 to 59 wt .-% gold, in particular 58.5 wt .-% gold. Weißgold-Legierung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Weißgold-Legierung 30 Gew.-% Silber enthält.White gold alloy according to one of the preceding claims, characterized in that the white gold alloy contains 30 wt .-% silver. Weißgold-Legierung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Weißgold-Legierung 58,5 Gew.-% Gold, 30,5 Gew.-% Silber, 6 Gew.-% Zink, 1 Gew.-% Gallium, 1 Gew.-% Zinn und 3 Gew.-% Platin enthält.White gold alloy according to one of the preceding claims, characterized in that the white gold alloy 58.5 wt .-% gold, 30.5 wt .-% silver, 6 wt .-% zinc, 1 wt .-% gallium, 1 Wt .-% tin and 3 wt .-% platinum. Weißgold-Legierung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Weißgold-Legierung 58,5 Gew.-% Gold, 27 Gew.-% Silber, 1,5 Gew.-% Palladium, 1,5 Gew.-% Kupfer, 7 Gew.-% Zink, 5 Gew.-% Gallium, 1 Gew.-% Zinn und 3 Gew.-% Platin enthält.White gold alloy according to one of the preceding claims, characterized in that the white gold alloy 58.5 wt .-% gold, 27 wt .-% silver, 1.5 wt .-% palladium, 1.5 wt .-% copper , 7 wt .-% zinc, 5 wt .-% gallium, 1 wt .-% tin and 3 wt .-% platinum. Weißgold-Legierung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Weißgold-Legierung 58,5 Gew.-% Gold, 24,7 Gew.-% Silber, 3 Gew.-% Palladium, 1,5 Gew.-% Kupfer, 8,3 Gew.-% Zink, 1 Gew.-% Gallium und 3 Gew.-% Platin enthält.White gold alloy according to one of the preceding claims, characterized in that the white gold alloy 58.5 wt .-% gold, 24.7 wt .-% silver, 3 wt .-% palladium, 1.5 wt .-% copper , 8.3% by weight of zinc, 1% by weight of gallium and 3% by weight of platinum. Weißgold-Legierung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Weißgold-Legierung 58,5 Gew.-% Gold, 26,5 Gew.-% Silber, 3 Gew.-% Palladium, 1,5 Gew.-% Kupfer, 7,5 Gew.-% Zink, 1 Gew.-% Gallium und 2 Gew.-% Platin enthält.White gold alloy according to one of the preceding claims, characterized in that the white gold alloy 58.5 wt .-% gold, 26.5 wt .-% silver, 3 wt .-% palladium, 1.5 wt .-% copper , 7.5% by weight of zinc, 1% by weight of gallium and 2% by weight of platinum. Weißgold-Legierung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Weißgold-Legierung 58,5 Gew.-% Gold, 28,5 Gew.-% Silber, 2 Gew.-% Palladium, 7 Gew.-% Zink, 1 Gew.-% Gallium und 3 Gew.-% Platin enthält.White gold alloy according to one of the preceding claims, characterized in that the white gold alloy 58.5 wt .-% gold, 28.5 wt .-% silver, 2 wt .-% palladium, 7 wt .-% zinc, 1 Wt .-% gallium and 3 wt .-% platinum. Weißgold-Legierung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Weißgold-Legierung mindestens einen Kornfeiner enthält.White gold alloy according to one of the preceding claims, characterized in that the white gold alloy contains at least one grain refiner.
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EP14002176.7A Active EP2818567B1 (en) 2013-06-27 2014-06-25 White gold alloy, in particular for use in a stone casting method

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202015006386U1 (en) 2015-09-16 2016-12-19 C. Hafner Gmbh + Co. Kg White gold alloy
DE102015011788A1 (en) 2015-09-16 2017-03-16 C. Hafner Gmbh + Co. Kg White gold alloy
EP3144401A1 (en) 2015-09-16 2017-03-22 C. Hafner GmbH + Co. KG White gold alloy for jewellery

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4008080A (en) 1974-11-13 1977-02-15 Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler Copper free dental gold alloys
DE2638837A1 (en) * 1976-08-28 1978-03-02 Heraeus Gmbh W C Gold alloy dental solder contg. no cadmium - for soldering gold base dental prostheses
JPS6167731A (en) 1984-09-07 1986-04-07 Tokuriki Honten Co Ltd Dental alloy powder for kneading and filling material
EP0225483A2 (en) 1985-12-07 1987-06-16 Degussa Aktiengesellschaft Dental-gold alloys
US5453290A (en) 1990-09-10 1995-09-26 Elephant Edelmetaal B.V. Dental procelain, a method of producing a dental restoration, a dental alloy
DE19719677A1 (en) * 1996-09-18 1998-03-26 Herbst Bremer Goldschlaegerei Precious metal alloy especially gold dental alloy
DE19958800A1 (en) * 1999-06-30 2001-01-04 Wieland Edelmetalle White gold jewelry alloy for all jewelry purposes contains alloying additions of silver and iron
DE10008744A1 (en) * 2000-02-24 2001-08-30 Wieland Edelmetalle White gold jewelry alloy
JP2006070336A (en) * 2004-09-03 2006-03-16 Nippon Shiken Kogyo Kk Gold alloy with ultralow melting characteristic and extremely low shrinkage characteristic particularly suitable for dental use
EP2636039A1 (en) 2010-11-04 2013-09-11 Qualcomm Incorporated(1/3) Stable sram bitcell design utilizing independent gate finfet

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4008080A (en) 1974-11-13 1977-02-15 Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler Copper free dental gold alloys
DE2638837A1 (en) * 1976-08-28 1978-03-02 Heraeus Gmbh W C Gold alloy dental solder contg. no cadmium - for soldering gold base dental prostheses
JPS6167731A (en) 1984-09-07 1986-04-07 Tokuriki Honten Co Ltd Dental alloy powder for kneading and filling material
EP0225483A2 (en) 1985-12-07 1987-06-16 Degussa Aktiengesellschaft Dental-gold alloys
US5453290A (en) 1990-09-10 1995-09-26 Elephant Edelmetaal B.V. Dental procelain, a method of producing a dental restoration, a dental alloy
DE19719677A1 (en) * 1996-09-18 1998-03-26 Herbst Bremer Goldschlaegerei Precious metal alloy especially gold dental alloy
DE19958800A1 (en) * 1999-06-30 2001-01-04 Wieland Edelmetalle White gold jewelry alloy for all jewelry purposes contains alloying additions of silver and iron
DE10008744A1 (en) * 2000-02-24 2001-08-30 Wieland Edelmetalle White gold jewelry alloy
JP2006070336A (en) * 2004-09-03 2006-03-16 Nippon Shiken Kogyo Kk Gold alloy with ultralow melting characteristic and extremely low shrinkage characteristic particularly suitable for dental use
EP2636039A1 (en) 2010-11-04 2013-09-11 Qualcomm Incorporated(1/3) Stable sram bitcell design utilizing independent gate finfet

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Zeitschrift Gold Bulletin 2005", June 2005, pages: 55 - 67

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202015006386U1 (en) 2015-09-16 2016-12-19 C. Hafner Gmbh + Co. Kg White gold alloy
DE102015011788A1 (en) 2015-09-16 2017-03-16 C. Hafner Gmbh + Co. Kg White gold alloy
EP3144401A1 (en) 2015-09-16 2017-03-22 C. Hafner GmbH + Co. KG White gold alloy for jewellery

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