Method for processing a dispersion-hardened platinum composition

Patent metadata

Field	Value
Publication number	US-2016289808-A1
Application number	US-201415100809-A
Country	US
Kind code	A1
Filing date	Dec 4, 2014
Priority date	Dec 6, 2013
Publication date	Oct 6, 2016
Grant date	—

Abstract

A method for processing a dispersion-hardened platinum composition is provided. A three-dimensional body of a dispersion-hardened platinum composition containing at least 70% by weight platinum and maximally 29.95% by weight other precious metals, as well as 0.05% by weight to 0.5% by weight of at least one partially-oxidized non-precious metal selected from zirconium, cerium, scandium, and yttrium is provided and cold formed, whereby the cross-sectional area of the three-dimensional body is reduced by maximally 20% during the cold forming, Subsequently a temperature treatment is performed on the cold-formed three-dimensional body, in which the cold-formed product is tempered at at least 1,100° C. for at least one hour. A method for producing a product made of a dispersion-hardened platinum composition, a dispersion-hardened platinum material obtained according to the processing method, and the use of a dispersion-hardened platinum material are also described.

First claim

1 .- 15 . (canceled)

16 . A method for processing a dispersion-hardened platinum composition, comprising:
providing a three-dimensional body of a dispersion-hardened platinum composition comprising at least 70% by weight platinum, maximally 29.95% by weight other precious metals, and 0.05% by weight to 0.5% by weight of at least one partially-oxidized non-precious metal selected from zirconium, cerium, scandium, and yttrium; cold forming the dispersion-hardened platinum composition to form a cold-pressed three-dimensional body, wherein a cross-sectional area of the three-dimensional body is reduced by maximally 20% during the cold forming; and subsequently performing a temperature treatment on the cold-formed three-dimensional body by tempering at a temperature of at least 1,100° C. for at least one hour.

17 . The method according to claim 16 , further comprising before the cold forming step, forming the dispersion-hardened platinum composition by a hot forming process at a temperature of at least 800° C.

18 . The method according to claim 16 , wherein multiple consecutive cold forming steps are performed and the cross-sectional area of the three-dimensional body is reduced by more than 20% by the cold forming steps, wherein each individual cold forming step reduces a cross-sectional area of the three-dimensional body by maximally 20%, and wherein a temperature treatment is performed on the cold-formed three-dimensional body between each cold forming step by tempering at a temperature of at least 1,100° C. for at least one hour.

19 . The method according to claim 18 , wherein the tempering comprises tempering at a temperature of at least 1,550° C. for at least 24 hours, at a temperature of at least 1,600° C. for at least 12 hours, at a temperature of at least 1,650° C. for at least one hour, or at a temperature of 1,690° C. to 1,740° C. for at least 30 minutes during the last temperature treatment after the last cold forming step.

20 . The method according to claim 16 , wherein the cold forming comprises drawing, pushing, pressing, or rolling a wire, sheet or tube of the dispersion-hardened platinum composition, wherein a cross-sectional area of the wire, the sheet, or the tube, or a thickness of the sheet is reduced by maximally 20% during the cold forming step.

21 . The method according to claim 16 , wherein the cold forming is performed at a temperature of 500° C. or less.

22 . The method according to claim 16 , wherein the temperature treatment heals defects of the three-dimensional body.

23 . The method according to claim 16 , wherein the tempering is performed at a temperature of at least 1,250° C. for at least one hour.

24 . The method according to claim 16 , wherein the dispersion-hardened platinum composition is produced from a composition comprising at least 70% by weight platinum, maximally 29.95% by weight other precious metals, and 0.05% by weight to 0.5% by weight of at least one non-precious metal selected from ruthenium, zirconium, cerium, scandium, and yttrium by at least partial oxidation of the at least one non-precious metal.

25 . The method according to claim 24 , wherein the oxidation of the at least one non-precious metal is performed at a temperature between 600° C. and 1,600° C. in an oxidizing atmosphere.

26 . A dispersion-hardened platinum material produced by the method according to claim 16 .

27 . A cylindrical three-dimensional body made of the dispersion-hardened platinum material according to claim 26 , wherein the body withstands a tensile strain of 9 MPa in a direction of the length of the three-dimensional body at a temperature of 1,600° C. for at least 40 hours without tearing.

28 . A sheet metal made of the dispersion-hardened platinum material according to claim 26 , wherein the sheet has a rectangular cross-section of 0.85 mm×3.9 mm and a length of 140 mm, and wherein the sheet sags by less than 40 mm after 40 hours in a oven chamber at 1,650° C. on two parallel-arranged cylindrical rods with a circular cross-section and a diameter of 2 mm at a distance of 100 mm when the middle of the sheet metal is exposed to a load of 30 g.

29 . A sheet metal, a tube, a wire, or a product formed from a wire, tube, and/or sheet metal comprising the dispersion-hardened platinum material according to claim 26 .

30 . The dispersion-hardened platinum material according to claim 26 , wherein the dispersion-hardened platinum material comprises 0.05% by weight to 0.3% by weight of at least one at least partially-oxidized non-precious metal selected from zirconium, cerium, scandium, and yttrium.

31 . A device comprising a dispersion-hardened platinum material produced according to the method of claim 16 .

Assignees

• Heraeus Deutschland Gmbh & Co Kg

Inventors

• Maier Dirk

Classifications

• C22C5/04 Primary

  Alloys based on a platinum group metal · CPC title

• B22F2999/00

  Aspects linked to processes or compositions used in powder metallurgy · CPC title

• C22F1/14 Primary

  of noble metals or alloys based thereon · CPC title

• B22F2003/248

  Thermal after-treatment · CPC title

• C22C1/1078

  by internal oxidation of material in solid state · CPC title