Title:
HIGH-HARDNESS NOBLE METAL ALLOY AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2023/063156
Kind Code:
A1
Abstract:
The present invention is a noble metal alloy mainly made from a Pt-Au-Ni-Pd quaternary alloy. The noble metal alloy contains 7.5 at% to 72.5 at% inclusive of Pt, 5.5 at% to 62.5 at% inclusive of Au, 3 at% to 62.5 at% inclusive of Ni and 0.15 at% to 38 at% inclusive of Pd. When the concentrations (at%) of Pt, Au, Ni and Pd are respectively defined as CPt, CAu, CNi and CPd, the value of a first composition parameter z1 mentioned below is 0.5 to 2.88 inclusive and the concentration of Pd CPd is CPd ≤ z2 relative to the value of a second composition parameter z2 mentioned below. The noble metal alloy according to the present invention is a high-hardness noble metal alloy to which a strengthening mechanism by spinodal decomposition and/or ordering is applied. z1 = (CPt×CAu×CNi)/10000 z2 = a×(CAu)3+b×(CAu)2+c×CAu+d In the formulae, variables a, b, c and d are respectively the following values. a = 0.00077, b = -0.102, c = 3.607, d = 1.722
Inventors:
EBISUGI MASATO (JP)
Application Number:
PCT/JP2022/037042
Publication Date:
April 20, 2023
Filing Date:
October 04, 2022
Export Citation:
Assignee:
TANAKA PRECIOUS METAL IND (JP)
International Classes:
C22C5/02; C22C5/04; C22C19/03; C22C30/00; C22F1/00; C22F1/10; C22F1/14
Domestic Patent References:
| WO2020110986A1 | 2020-06-04 |
Foreign References:
| JPH04147932A | 1992-05-21 | |||
| JPS56156729A | 1981-12-03 | |||
| JP2004093355A | 2004-03-25 | |||
| JP2005233967A | 2005-09-02 | |||
| JP2012242184A | 2012-12-10 | |||
| JP6372952B2 | 2018-08-15 |
Other References:
MASAHARU KATO, INTRODUCTION TO THE THEORY OF DISLOCATIONS, August 1999 (1999-08-01)
AKIRA TAKEUCHIAKIHISA INOUE: "Classification of Bulk Metallic Glasses by Atomic Size Difference, Heat of Mixing and Period of Constituent Elements and Its Application to Characterization of the Main Alloying Element", MATERIALS TRANSACTIONS, vol. 46, 2005, pages 2817 - 2829
AKIRA TAKEUCHIAKIHISA INOUE: "Classification of Bulk Metallic Glasses by Atomic Size Difference, Heat of Mixing and Period of Constituent Elements and Its Application to Characterization of the Main Alloying Element", MATERIALS TRANSACTIONS, vol. 46, 2005, pages 2817 - 2829
Attorney, Agent or Firm:
ORIGINATE IP (JP)
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