METHOD FOR PRODUCING PLATINUM MATERIAL REINFORCED WITH DISPERSED OXIDE

Title:

METHOD FOR PRODUCING PLATINUM MATERIAL REINFORCED WITH DISPERSED OXIDE

Document Type and Number:

WIPO Patent Application WO/2002/000951

Kind Code:

A1

Abstract:

A method for producing a platinum material reinforced with dispersed oxide, which comprises adding powdered platinum into water to prepare a platinum suspension, admixing the platinum dispersion with a zirconium nitrate solution and a urea solution, adjusting the mixed solution to a predetermined pH value to precipitate zirconium hydroxide, thereby forming a platinum carrying zirconium hydroxide, preparing a formed product from the platinum carrying zirconium hydroxide, subjecting the formed product to a sintering treatment and a forging treatment under conditions wherein the secondary recrystallization of platinum crystals proceeds, to form a platinum ingot, and subjecting the platinum ingot to a cold rolling treatment at a rolling reduction of 70 % or more, followed by a recrystallization heat-treatment. The method allows more fine dispersion of zirconium oxide into a platinum material and thus the production of a platinum material reinforced with dispersed oxide having improved creep strength characteristics.

Inventors:

SHOJI TORU (JP)
HITOMI SOICHI (JP)
TAKAGI YOSHIKAZU (JP)
WATANABE YOSHINOBU (JP)

Application Number:

PCT/JP2001/005127

Publication Date:

January 03, 2002

Filing Date:

June 15, 2001

Export Citation:

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Assignee:

TANAKA PRECIOUS METAL IND (JP)
SHOJI TORU (JP)
HITOMI SOICHI (JP)
TAKAGI YOSHIKAZU (JP)
WATANABE YOSHINOBU (JP)

International Classes:

C22B3/44; B22F1/00; B22F1/02; B22F3/24; C03B5/167; C22B11/00; C22C1/00; C22C1/05; C22C1/10; C22C5/04; C22C32/00; (IPC1-7): C22C1/05

Foreign References:

JP2000160268A

2000-06-13

Other References: