Noble Metal Alloy Green Compact for Uniform Sintered Composition
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Solution Overview
Problem
Conventional powder metallurgy techniques are unsuitable for producing multicomponent noble metal alloys due to issues such as embrittlement, crumbling during resin removal, compositional non-uniformity, and lack of high crystallinity, which affect the uniformity and properties of the final product.
Innovation Solution
Using a noble metal alloy powder with specific average particle diameter, crystallite size, and X-ray diffraction spectrum characteristics, along with a resin, to form a green compact and subsequently firing it to achieve a noble metal alloy with high crystallinity and compositional uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional powder metallurgy techniques are used to mix multiple noble metal powders and perform compacting and sintering, then multicomponent noble metal alloy products can be produced, but the compact cannot be maintained due to embrittlement and crumbling during resin removal
Solution Approach 1:
The invention changes the particle size parameter of the noble metal alloy powder to 10 μm or less, which fundamentally alters the compact's mechanical properties and prevents embrittlement during resin removal while maintaining the ability to produce multicomponent alloys
Solution Approach 2:
The invention uses a composite noble metal alloy powder containing multiple noble metal elements (Au, Ag, Cu, Pt, Pd, Rh, Ir, Ru, Os) in specific proportions, creating a composite material that maintains compact stability while enabling multicomponent alloy production
2Adaptability or versatility
If conventional powder metallurgy techniques are used to produce noble metal alloys, then various alloy compositions can be achieved, but microscopic non-uniformity of element distribution and compositional variation occur
Solution Approach 1:
The invention merges multiple noble metal elements into a single alloy powder phase with uniform distribution, eliminating the non-uniformity that occurs when separate powders are mixed. The alloy powder contains all elements uniformly distributed at the atomic level, ensuring compositional precision while maintaining composition adjustability
Solution Approach 2:
The invention changes the structural parameter of the powder from a mixed powder state to a single-phase alloy powder state with uniform element distribution, achieving compositional uniformity while preserving the ability to adjust alloy composition
3Manufacturing precision
If conventional powder metallurgy techniques are used with fine powders, then compositional uniformity can be improved, but the powder lacks high crystallinity
Solution Approach 1:
The invention changes the crystallite size parameter to 60 nm or more, which simultaneously improves crystallinity and maintains compositional uniformity. This parameter change stabilizes the crystal structure while preserving the uniform element distribution achieved through the alloy powder formulation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method results in a noble metal alloy with uniform composition and high crystallinity, ensuring stable properties and efficient utilization in applications like hydrogen storage, molecular sieves, catalysts, and electrodes.
Implementation Method 1
powder metallurgy is a technique whereby a metal powder serving as a raw material is mixed with a binder as necessary and is subsequently subjected to compacting and firing to obtain a metal product (fired product)
Implementation Method 2
exhibits an X-ray diffraction spectrum in which a number of peaks observed in a diffraction angle 2θ range of 38° to 44° is 1
Data Source
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AI summary
Provided are a noble metal alloy green compact and fired product having high crystallinity and excellent compositional uniformity. The green compact is formed of an alloy powder and a resin. The alloy powder is a noble metal alloy powder formed of an alloy of 5 or more noble metal elements, has an average particle diameter of 0.1 µm to 100 µm, has a crystallite size of 60 nm or more, and exhibits an X-ray diffraction spectrum in which a number of peaks observed in a diffraction angle 2θ range of 38° to 44° is 1.