Gold Matrix Composite for Horological Parts
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Solution Overview
Problem
Existing metal alloys used for horological components, such as watch parts, often struggle to balance desired color with required hardness, and they may not withstand color and mechanical property modifications over time, especially when exposed to aggressive media.
Innovation Solution
A metal matrix composite material is developed, comprising a high percentage of gold, platinum, or palladium, combined with a hardening element and ceramic particles, which enhances hardness and stability while maintaining a desired color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a high gold content alloy (Au75Ag25) is used to achieve an attractive color, then the color demand is met, but the hardness is too low (less than 40 HV) for horological components
Solution Approach 1:
The patent applies composite materials by combining a gold-based metal alloy matrix with ceramic reinforcement particles (alumina, zirconia, silica, or boron nitride) comprising 5-50 wt% of the total composition. This creates a metal matrix composite that integrates the aesthetic properties of gold with the hardness and stability of ceramic particles, resolving the contradiction between color attractiveness and mechanical hardness.
Solution Approach 2:
The patent changes the compositional parameters by precisely controlling the gold content (45-75 wt%), ceramic particle content (5-50 wt%), and optional alloying elements (copper, zinc, nickel, manganese, cobalt, titanium, aluminum, or silicon at 0.1-5 wt% each). By adjusting these parameters, the material achieves both desired color characteristics and sufficient hardness for horological applications.
2Illumination intensity
If a metal alloy is used to meet color requirements, then color demand is satisfied, but the alloy lacks stability against color modification over time when exposed to aggressive media
Solution Approach 1:
The ceramic reinforcement particles (alumina, zirconia, silica, or boron nitride) form a stable network within the gold-based matrix, creating a composite structure that resists chemical attack from aggressive media. The ceramic particles do not oxidize or react with water, salts, or soaps, thereby preventing color modification over time while maintaining the aesthetic appearance of the gold alloy.
Solution Approach 2:
The patent uses small quantities of stable ceramic particles dispersed throughout the alloy matrix to provide long-term color stability. These inert ceramic inclusions act as permanent stabilizers that prevent degradation of the gold alloy's appearance when exposed to mildly aggressive aqueous media over extended periods.
3Illumination intensity
If a metal alloy is used to meet color requirements, then color demand is satisfied, but the alloy lacks sufficient mechanical strength and robustness over time
Solution Approach 1:
The metal matrix composite structure combines the ductility and formability of the gold-based alloy matrix with the high strength and stiffness of ceramic reinforcement particles. The ceramic particles (alumina, zirconia, silica, or boron nitride) act as reinforcement that prevents deformation and maintains structural integrity under mechanical stress, while the gold matrix provides the desired color and workability.
Solution Approach 2:
The patent optimizes mechanical strength by controlling the ceramic particle content (5-50 wt%), particle size (0.1-10 micrometers), and distribution within the matrix. The optional addition of hardening elements (copper, zinc, nickel, manganese, cobalt, titanium, aluminum, or silicon at 0.1-5 wt% each) further enhances mechanical properties while maintaining color characteristics.
Data Source
AI summary
The metal matrix composite material for a horological component comprises a metal alloy based on gold, with at least 75% by weight of gold, or based on platinum, with at least 95% by weight of platinum, or based on palladium, with at least 95% by weight of palladium, the composite material further including between 0.1% and 2% by weight, or even between 0.5% and 2% by weight, or even between 0.5% and 1.5% by weight, or even between 0.5% and 1.25% by weight, or even between 0.5% and 1% by weight, of at least one hardening element, and a reinforcing material, in a proportion by mass of between 1% and 10%, or even between 1% and 5%, the reinforcing material including ceramic particles.