High-hardness precious metal alloy and method for producing the same
A Pt—Au—Ni—Pd quaternary alloy enhances hardness via spinodal decomposition and ordering, overcoming embrittlement issues in conventional alloys, achieving 500 Hv or more hardness for electric and medical applications.
US20250305094A1Pending Publication Date: 2025-10-02TANAKA PRECIOUS METAL TECHNOLOGIES CO LTD
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Patent Information
- Application Number
- US18/700703
- Authority / Receiving Office
- US · United States
- Patent Type
- Applications(United States)
- Current Assignee / Owner
- Priority Date
- 2021-10-15
- Filing Date
- 2022-10-04
- Publication Date
- 2025-10-02
AI Technical Summary
Technical Problem
Conventional precious metal alloys used in electric and medical applications face limitations in hardness enhancement due to material embrittlement and reduced workability from excessive work hardening, necessitating a different strengthening mechanism.
Method used
A Pt—Au—Ni—Pd quaternary alloy is developed through spinodal decomposition and ordering, optimized by specific compositional ranges and heat treatment, achieving a hardness of 500 Hv or more without work hardening.
Benefits of technology
The alloy achieves unprecedented hardness without material embrittlement, suitable for applications requiring high mechanical properties like probe pins and medical tools, with a modulated texture and ordered phase contributing to dislocation resistance.
✦ Generated by Eureka AI based on patent content.
Abstract
A precious metal alloy mainly including a quaternary alloy of Pt, Au, Ni, and Pd includes 7.5% by atom or more and 72.5% by atom or less of Pt, 5.5% by atom or more and 62.5% by atom or less of Au, 3% by atom or more and 62.5% by atom or less of Ni, and 0.15% by atom or more and 38% by atom or less of Pd. When respective concentrations (% by atom) of Pt, Au, Ni, and Pd represent CPt, CAu, CNi, CPd, the value of the following first compositional parameter z1 is 0.5 or more and 2.88 or less and also the concentration CPd of Pd satisfies CPd≤z2 with respect to the following second compositional parameter z2. A present inventive precious metal alloy is a high-hardness precious metal alloy to which a strengthening mechanism by spinodal decomposition and / or ordering is applied.z1=(CPt×CAu×CNi) / 10000[Expression 1]z2=a×(CAu)3+b×(CAu)2+c×CAu+d[Expression 2]coefficients a, b, c, and d are the following numerical values.a=0.00077, b=−0.102,c=3.607, d=1.722
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