[go: up one dir, main page]

WO1998048067A1 - Procede de formation direct de titane ou d'alliages de titane - Google Patents

Procede de formation direct de titane ou d'alliages de titane Download PDF

Info

Publication number
WO1998048067A1
WO1998048067A1 PCT/AU1998/000205 AU9800205W WO9848067A1 WO 1998048067 A1 WO1998048067 A1 WO 1998048067A1 AU 9800205 W AU9800205 W AU 9800205W WO 9848067 A1 WO9848067 A1 WO 9848067A1
Authority
WO
WIPO (PCT)
Prior art keywords
titanium
melting point
low melting
semi
process according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/AU1998/000205
Other languages
English (en)
Inventor
Claude Fortin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AU64899/98A priority Critical patent/AU6489998A/en
Publication of WO1998048067A1 publication Critical patent/WO1998048067A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/11—Making porous workpieces or articles
    • B22F3/1121—Making porous workpieces or articles by using decomposable, meltable or sublimatable fillers
    • B22F3/1125—Making porous workpieces or articles by using decomposable, meltable or sublimatable fillers involving a foaming process
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C14/00—Alloys based on titanium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
    • C22F1/18—High-melting or refractory metals or alloys based thereon
    • C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/11—Making porous workpieces or articles
    • B22F3/1121—Making porous workpieces or articles by using decomposable, meltable or sublimatable fillers
    • B22F3/1125—Making porous workpieces or articles by using decomposable, meltable or sublimatable fillers involving a foaming process
    • B22F2003/1128—Foaming by expansion of dissolved gas, other than with foaming agent

Definitions

  • alloy refers to a mixture of combination of metals whether or not they are chemically joined.
  • the titanium or titanium alloy can be formed with one or more structures depending on the particular elements present and the level of the vacuum/pressure and temperature employed.
  • the titanium is introduced to liquid bismuth or liquid low melting point alloy comprising bismuth and/or antimony and/or lead.
  • the alloy comprises bismuth and an element chosen from the group comprising selenium, antimony, zinc, lead, aluminium, tin and vanadium. More typically the low melting point alloy comprises bismuth and antimony.
  • the drawing of the titanium from the liquid bismuth or liquid low melting point alloy may be carried out by many different processes.
  • the titanium is drawn using a vacuum column.
  • the lower end of a vacuum column is partly immersed in a bath of liquid bismuth or low melting point alloy, and the pressure in the vacuum column is then reduced by opening the upper end of the column to a vacuum pump.
  • Titanium particles gather at the immersed base of the vacuum column by virtue of the relatively low density of titanium.
  • a combination of titanium and bismuth and possibly other elements, climbs to the upper, low pressure part of the column. The titanium and bismuth and other elements are thus drawn along the vacuum column to progressively form the semi-finished titanium product.
  • the vacuum column facilitates segregation along its length. For example, without wishing to be bound by theory, it is believed that typically the TiBi at the bottom of the column will become Ti 3 Bi . Furthermore, under vacuum and high temperature, the bismuth can evaporate and allow titanium crystals to grow the higher in the column they rises.
  • the semi-finished titanium product may be directly used to manufacture a finished product.
  • the semi-finished product may be subjected to further processing steps which alter the composition, remove undesirable species or alter the physical characteristics (such as the porosity) of the semi-finished product.
  • the semi-finished product may be subjected to further processing steps such as degassing and homogenisation.
  • further processing may be required to remove metal species such as magnesium or sodium from the semi-finished product.
  • metal species such as magnesium or sodium
  • magnesium may be present in the semi-finished product if the titanium was produced using the Kroll process or sodium may be present if the titanium was produced using the Hunter process.
  • the process of the present invention comprises a further degassing step, that is, a step which causes at least one species to diffuse out of the semifinished species as a gas.
  • Degassing may be carried out by any convenient method but typically the degassing is carried out by heating the semi-finished product in a vacuum oven and reducing the pressure in the oven.
  • the semi-finished product comprises titanium in combination with bismuth
  • degassing may cause a certain amount of the bismuth to diffuse out of the product. It is believed that where the semi-finished product comprises titanium in admixture with bismuth, the degassing and diffusion of bismuth may permit the rearrangement of atoms in the semi-finished product to form an intermetallic compound or alloy such as Ti 3 Bi. It is believed that similar rearrangements may occur in respect of other metals present in the semi-finished product.
  • Diffusion of gas out of the semi-finished product may also increase the porosity or micro-porosity of the semi-finished product.
  • the process of the present invention may further comprise an expansion step in which the semi-finished product undergoes such an extensive diffusion of gas that the entire structure of the semi-finished product expands, thus converting the semi-finished product into an expanded porous product resembling foam.
  • the expansion may be sufficient to fill the interior of the tube with porous expanded material.
  • the extruded semi-finished product is submitted to a degassing step which causes partial degassing before the expansion step.
  • the expansion step may be carried out by many different methods but typically, expansion is carried out using a method similar to that used for degassing, but with higher power, vacuum and processing rates.
  • the semi-finished product is pre-cooled before undergoing an expansion step.
  • the porous, expanded product is again subjected to a degassing step and the stabilized by being placed in a vacuum.
  • the process of the present invention may further comprise a step of homogenisation.
  • the semi-finished product is held at high temperature, preferably under vacuum, until sufficient diffusion occurs within semi-finished product to provide a uniform composition and structure.
  • the semi-finished product obtained by the process of the present invention has good high temperature properties which allows easy homogenisation.
  • Homogenisation may be carried out by any convenient method known in the art such as moving an inductor along the semi-finished product, or moving the semi-finished product through an inductor. Alternatively, homogenisation may be achieved using laser or electronic bombardment methods .
  • the semi-finished product may be subjected to the step of superficial refusion by induction, application of a laser or any other convenient process.
  • the superficial refusion step causes the outermost pores to close over and seal, thus forming a skin on the surface of the semi-finished product.
  • the product thus obtained is of particularly low density and has superior mechanical characteristics compared to products of the prior art, thus opening the way to new applications of titanium.
  • the precise physical characteristics of the semi-finished product obtained will depend upon the exact processing parameters applied.
  • the column is inclined upwards at an angle.
  • an open structured product is obtained.
  • the continuous product may then proceed under vacuum along a horizontal section of column where stabilization, degassing and skin formation may occur.
  • the product may then continue along a downward sloping column which terminates in a second bath of low melting point alloy.
  • ground titanium sponge is introduced into a bath of liquid, low melting point alloy comprising bismuth.
  • the lower end of a first inclined vacuum column is partly immersed in the liquid, and the pressure in the first vacuum column is then reduced by opening the upper end of the first vacuum column to a vacuum pump.
  • Titanium gathers at the immersed base of the vacuum column by virtue of the relatively low density of titanium.
  • Under pull of the vacuum a combination of titanium particles and bismuth climbs to the upper, low pressure part of the column.
  • the titanium and bismuth are thus drawn along the vacuum column to form a pre-consolidated semi-finished product which is extruded through a nozzle in the form of a tube and is later heated in a vacuum oven to de-gas.
  • the degassed semi-finished product is then passed through an inductor to homogenise the structure and composition.
  • a continuous piece of metal wire preferably titanium wire
  • This continuous titanium wire ensures sufficient strength for the product to proceed through the column and the process.
  • the product then passes to a second, horizontal column where the product is degassed under vacuum.
  • the semi-finished titanium product of examples 1 and 2 differed in so far as the product of example 1 comprised an admixture of titanium and bismuth in combination with some intermetallic species while the product of example 2 was comprised almost entirely of Ti 3 Bi.
  • a semi-finished titanium product produced by the process described in Example 1 was placed in a vacuum oven at elevated temperatures such that the pores dilated and the product expanded substantially and increased in porosity until resembling foam.
  • the method used for the expansion step was similar to the method used for degassing semi-finished titanium product but the power, vacuum and relative processing rates used were substantially higher than for the degassing performed according to Example 2.
  • the semi-finished product of examples 2 and 3 differed in so far as the product of example 3 had an open, porous structure resembling foam and concomitantly lower density than the less porous structure of the product of example 2.
  • a semi-finished titanium product was produced by the process described in Example 1 was placed in a vacuum oven at elevated temperatures and subjected to degassing, then passed through an inductor to homogenize the composition and then subjected to a final diffusion treatment under vacuum.
  • a semi-finished titanium product was produced by the process described in Example 4 and then subjected to superficial refusion.
  • the semi-finished titanium product is then drawn along a substantially horizontal vacuum column where it is subjected to degassing by application of vacuum, homogenisation by being passed through an inductor, and finally, superficial refusion.
  • the semi-finished titanium product thus formed was suitable for direct supply to a commercial process.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Powder Metallurgy (AREA)

Abstract

La présente invention a pour objet un procédé pour former des alliages métalliques de titane, directement à partir d'éponges de titane écrasées ou de poudres. Ce procédé fait appel à un bain à faible point de fusion, contenant du bismuth et permettant d'introduire du titane sous vide, ainsi que d'autres éléments, tout en facilitant l'extrusion à basse température. Les produits extrudés semi-finis subissent ensuite un traitement de dégazage, groupement, homogénéisation et diffusion. Les produits semi-finis ainsi obtenus peuvent être coupés, étirés, roulés, etc.. Le traitement de dégazage et diffusion crée des pores ou des micro-pores qui peuvent être éliminés pendant le traitement d'homogénéisation ou qui peuvent être, par ailleurs, dilatés pour produire des matériaux poreux et plus légers. Pour obtenir ce résultat, les caractéristiques doivent nécessairement être adaptés et il est possible d'ajouter un agent approprié au bain. La refonte superficielle permet de former une peau.
PCT/AU1998/000205 1997-04-18 1998-03-26 Procede de formation direct de titane ou d'alliages de titane Ceased WO1998048067A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU64899/98A AU6489998A (en) 1997-04-18 1998-03-26 Process of direct forming titanium or titanium alloys

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPO6307A AUPO630797A0 (en) 1997-04-18 1997-04-18 Process of direct forming of titanium alloys
AUPO6307 1997-04-18

Publications (1)

Publication Number Publication Date
WO1998048067A1 true WO1998048067A1 (fr) 1998-10-29

Family

ID=3800602

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1998/000205 Ceased WO1998048067A1 (fr) 1997-04-18 1998-03-26 Procede de formation direct de titane ou d'alliages de titane

Country Status (3)

Country Link
AU (1) AUPO630797A0 (fr)
WO (1) WO1998048067A1 (fr)
ZA (1) ZA98604B (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998014622A1 (fr) * 1996-09-30 1998-04-09 Kleeman, Ashley Processus de production de titane ou d'autres metaux a partir d'alliages navettes

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998014622A1 (fr) * 1996-09-30 1998-04-09 Kleeman, Ashley Processus de production de titane ou d'autres metaux a partir d'alliages navettes

Also Published As

Publication number Publication date
ZA98604B (en) 1999-07-22
AUPO630797A0 (en) 1997-05-15

Similar Documents

Publication Publication Date Title
KR101184464B1 (ko) 향상된 특성을 가진 티타늄 합금 와이어의 제조 방법
EP1397223B1 (fr) Production de mousses metalliques
JPH07331364A (ja) 近似γチタンアルミナイド合金で形作られた製造物を熱機械的に処理するための方法
EP0479757B1 (fr) Procédé et dispositif pour la fabrication d'alliages à base de titane-aluminium
UA81254C2 (uk) Спосіб виробництва металевого виробу без будь-якого плавлення
WO2002061160A2 (fr) Realisation de mousses structurees metalliques planes
EP1444065B1 (fr) Procede de production d'alliages intermetalliques (ingots)
EP1017864B1 (fr) Alliage destine a la production de corps metalliques en mousse a l'aide d'une poudre ayant des adjuvants formant des germes
Lehmhus et al. Potential new matrix alloys for production of PM aluminium foams
US20020085941A1 (en) Processing of aluminides by sintering of intermetallic powders
WO2006005150A1 (fr) Procedes de production de corps en aluminium mousse a partir de poudre d'aluminium enrobee
DE19717894B4 (de) Verfahren zur Herstellung von porösen Matrixmaterialien, insbesondere Formkörper auf Basis von Metallen, und von Halbzeug dafür
CA2454169A1 (fr) Procede de fabrication de produits semi-fabriques poreux en poudres d'alliages d'aluminium
AT413344B (de) Verfahren zur herstellung von metallschaumkörpern
WO2009030194A1 (fr) Procédé de fabrication d'un corps façonné, à structure du type mousse
WO1998048067A1 (fr) Procede de formation direct de titane ou d'alliages de titane
EP2425027B1 (fr) Traitement d'aluminides de fer par frittage sans pression de fer et aluminium elementaires
EP3661677A1 (fr) Procédé de moussage de métal dans un bain de liquide
DE19810979C2 (de) Aluminiumlegierung zum Herstellen von Aluminiumschaumkörpern unter Verwendung eines Pulvers mit keimbildenden Zusätzen
DE10215086B4 (de) Aufschäumbarer Metallkörper, Verfahren zu seiner Herstellung und seine Verwendung
WO2003037552A1 (fr) Procedes de realisation d'articles a partir d'alliage d'etain et/ou de titane
JPS5834103A (ja) ＮｉＴｉ系合金の製法
EP0868956B1 (fr) Procédé de fabrication d'articles métalliques à porosité interne
EP1602739B1 (fr) Procédé de recyclage de pièces en métal léger
JPS59157201A (ja) 亜鉛−アルミニウム合金粉末の成形体の製造方法

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GE GH GM GW HU ID IL IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG US UZ VN YU ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW SD SZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN ML MR NE SN TD TG

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

NENP Non-entry into the national phase

Ref country code: JP

Ref document number: 1998544546

Format of ref document f/p: F

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: CA