Method for processing a dispersion-hardened platinum composition

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.

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 .