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DE2013996C3 - Process for increasing the service life of thermocouple outer protection tubes - Google Patents

Process for increasing the service life of thermocouple outer protection tubes

Info

Publication number
DE2013996C3
DE2013996C3 DE19702013996 DE2013996A DE2013996C3 DE 2013996 C3 DE2013996 C3 DE 2013996C3 DE 19702013996 DE19702013996 DE 19702013996 DE 2013996 A DE2013996 A DE 2013996A DE 2013996 C3 DE2013996 C3 DE 2013996C3
Authority
DE
Germany
Prior art keywords
service life
outer protection
tubes
increasing
protective tubes
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.)
Expired
Application number
DE19702013996
Other languages
German (de)
Other versions
DE2013996A1 (en
DE2013996B2 (en
Inventor
Klaus-Dieter 5810 Wittenbommern Bruehl
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 DE19702013996 priority Critical patent/DE2013996C3/en
Publication of DE2013996A1 publication Critical patent/DE2013996A1/en
Publication of DE2013996B2 publication Critical patent/DE2013996B2/en
Application granted granted Critical
Publication of DE2013996C3 publication Critical patent/DE2013996C3/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/08—Protective devices, e.g. casings
    • G01K1/10—Protective devices, e.g. casings for preventing chemical attack

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Erhöhung der Standzeit von in Aluminiumschmelzen, Zinn-, Zink- oder Bleibädern einzusetzenden Thermoelement-Außenschutzrohren aus Metallen, deren wesentlicher Bestandteil Eisen ist.The invention relates to a method for increasing the service life of molten aluminum, tin, Thermocouple outer protection tubes to be used in zinc or lead baths from metals, the essential component of which is iron.

Bekannte Außcnschutzrohre von Thermoelementen aus Grauguß, Grafit, technisch reinem Gisen, emailliertem Stahl St.35.N oder aus Metallen mit hohen Nickel- und Chromanteilen haben nur eine verhältnismäßig kurze Lebensdauer, wenn die Thermoelemente zur Temperaturmessung in vorgehe nannten Schmelzen Verwendung finden. Known outer protection tubes of thermocouples made of gray cast iron, graphite, technically pure cast iron, enamelled steel St.35.N or of metals with high nickel and chromium contents only have a relatively short lifespan if the Find thermocouples for temperature measurement in the aforementioned melts use.

Aufgabe der Erfindung ist es nun. Maßnahmen zuThe object of the invention is now. Measures to

schaffen, mit jvelchen für die Außenschutzr:>hre von Thermoelementen, die in vorbeschriebenen Gebieten Anwendungfinden, weit höhere Standzeiten als bishercreate, with jvelchen for the external protection:> hear from Thermocouples that are used in the areas described above have a much longer service life than before

1S erzielbar sind. 1 S can be achieved.

Die Lösung dieser Aufgabe kennzeichnet sich erfiiidungsgcmäß dadurch, daß die Schutzrohre in Stickstoff abgebenden gas- oder pulverförmigen Medien bei Temperaturen zwischen 450° C und 700° C geglüht werden.The solution to this problem is characterized according to the invention in that the protective tubes in nitrogen-releasing gaseous or powdery media annealed at temperatures between 450 ° C and 700 ° C.

Als besonders vorteilhaft hat es sich herausgestellt, wenn die Schutzrohre in 520 bis 620" C heißen Cyansalzbädern in eisenfreien, belüfteten Tiegeln behandelt werden, wobei die Cyansalzbäder 50 r'c Cyanid und 50 % Cyanat enthalten und die Behandlungsdauer im Cyansalzbad sich über 6 Stunden erstreckt. Hierdurch wird in die vorzugsweise aus Eisen bestehenden Schutzrohre vornehmlich Stickstoff eindiffundiert und damit eine gegen eingangs genannte Schmelzen bisher unerreicht widerstandsfähige Schulzrohroberfläche erzielt, aus welcher erfahrungsgemäß eine Standzeitenerhöhung bis 1000 % für die Schutzrohre resultiert.As it is particularly advantageous has been found when the protective tubes in 520-620 "C hot Cyansalzbädern be treated in the iron-free, aerated crucibles said Cyansalzbäder contain 50 r 'c cyanide and 50% cyanate and the treatment time in Cyansalzbad extends over 6 hours As a result, primarily nitrogen is diffused into the protective tubes, which are preferably made of iron, and a Schulz tube surface that is previously unmatched resistant to melting is achieved, from which experience has shown an increase in the service life of the protective tubes by up to 1000%.

Claims (5)

Patentansprüche:Patent claims: 1. Verfahren zur E.höhung der Standzeit von in Aluminijimschmelzen, Zinn-, Zink- oder Bleibädern einzusetzenden Thermoelement-Außenschutzrohrcn aus Metallen, deren wesentlicher Bestandteil Eisen ist, d a d u r c h g e k e η η ζ e i c hnet, daß die Schutzrohre in Stickstoff abgebenden, gas- oder pulverförmigen Medien bei Temperaturen zwischen 450° C und 700° C geglüht werden.1. Procedure to E. increase the service life of Thermocouple outer protection tubes to be used in aluminum melts, tin, zinc or lead baths of metals, the essential component of which is iron, d a d u r c h g e k e η η ζ e i c hnet, that the protective tubes in nitrogen-releasing, gaseous or powdery media Temperatures between 450 ° C and 700 ° C are annealed. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Schutzrohre in Stickstoff und Kohlenstoff abgebenden gas- oder pulverförmigen Medien bei Temperaturen zwischen 450 bis 700° C behandelt werden.2. The method according to claim 1, characterized in that the protective tubes in nitrogen and carbon-releasing gaseous or powdery media at temperatures between 450 to 700 ° C. 3. Verfahren nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Schutzrohre in 520 bis 620° C heißen Cyansalzbädern in eisenfreien, belüfteten Tiegeln behandelt werden.3. The method according to claims 1 and 2, characterized in that the protective tubes in 520 Cyan salt baths with a temperature of up to 620 ° C can be treated in iron-free, ventilated crucibles. 4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß die Cyansalzbäder 50 % Cyanid und 50 % Cyanat enthalten.4. The method according to claim 3, characterized in that the cyan salt baths contain 50 % cyanide and 50% cyanate. 5. Verfahren nach den Ansprüchen 3 und 4, dadurch gekennzeichnet, daß die Behandlungsdauer im Cyansalzbad sich über 6 Stunden erstreckl.5. The method according to claims 3 and 4, characterized in that the treatment duration in the cyan salt bath extends over 6 hours.
DE19702013996 1970-03-24 1970-03-24 Process for increasing the service life of thermocouple outer protection tubes Expired DE2013996C3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19702013996 DE2013996C3 (en) 1970-03-24 1970-03-24 Process for increasing the service life of thermocouple outer protection tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702013996 DE2013996C3 (en) 1970-03-24 1970-03-24 Process for increasing the service life of thermocouple outer protection tubes

Publications (3)

Publication Number Publication Date
DE2013996A1 DE2013996A1 (en) 1971-10-14
DE2013996B2 DE2013996B2 (en) 1973-10-18
DE2013996C3 true DE2013996C3 (en) 1974-05-16

Family

ID=5766071

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19702013996 Expired DE2013996C3 (en) 1970-03-24 1970-03-24 Process for increasing the service life of thermocouple outer protection tubes

Country Status (1)

Country Link
DE (1) DE2013996C3 (en)

Also Published As

Publication number Publication date
DE2013996A1 (en) 1971-10-14
DE2013996B2 (en) 1973-10-18

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Legal Events

Date Code Title Description
C3 Grant after two publication steps (3rd publication)
E77 Valid patent as to the heymanns-index 1977
EHJ Ceased/non-payment of the annual fee