Ag Composite Plating Layer with Carbon and Sb for Low-Friction Wear
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Solution Overview
Problem
Existing composite plating materials for conductor materials like copper and copper alloys, which incorporate silver and carbon particles, lack sufficient wear resistance due to insufficient carbon and antimony content, leading to poor hardness and adhesion.
Innovation Solution
A composite plating material with a carbon content of 6.0 mass % or more and a Sb content of 0.5 mass % or more, along with a surface area ratio of carbon particles between 15 to 80%, and a Vickers hardness of 150 or more, is developed, using an electroplating method with a specific Ag plating solution and underplating layer to enhance wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silver plating is used on conductor materials, then oxidation prevention is improved, but wear resistance deteriorates due to softness and high friction coefficient
Solution Approach 1:
The patent applies composite materials by incorporating carbon particles and antimony into the silver plating matrix. This creates a composite structure where the silver provides oxidation resistance while carbon particles reduce friction and wear, and antimony enhances hardness. The composite nature allows simultaneous achievement of oxidation prevention and improved wear resistance that pure silver cannot provide.
Solution Approach 2:
The patent changes the compositional parameters of the plating by controlling the content of carbon particles (0.1-10 mass%) and antimony (0.1-5 mass%). By adjusting these parameters within specific ranges, the plating achieves optimal balance between oxidation resistance, wear resistance, and surface properties, resolving the contradiction through precise parameter optimization.
2Strength
If carbon content is increased to improve wear resistance, then wear resistance is improved, but surface roughness increases leading to higher friction coefficient
Solution Approach 1:
The patent employs a composite structure where carbon particles provide wear resistance while the silver matrix maintains surface smoothness. The antimony component further refines the microstructure. This composite approach allows high carbon content (up to 10 mass%) for wear resistance without proportionally increasing surface roughness and friction, as the carbon particles are distributed within the smooth silver matrix rather than forming a rough surface layer.
Solution Approach 2:
The patent optimizes the carbon particle content parameter within the range of 0.1-10 mass% and combines it with antimony content (0.1-5 mass%). This parameter optimization ensures sufficient wear resistance through adequate carbon content while preventing excessive surface roughness by maintaining the carbon content within the specified range and using antimony to refine the microstructure.
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 composite plating material exhibits improved wear resistance, hardness, and adhesion, maintaining a high level of performance even after sliding tests, with a friction coefficient of 0.5 or less and excellent contact reliability.
Implementation Method 1
performing electroplating using a composite plating solution in which carbon particles are added to an Ag plating solution containing Sb, thereby forming a composite plating layer on a base material
Data Source
AI summary
There is provided a composite plating material and a related technique thereof, the composite plating material including: a base material, and a composite plating layer on the base material, the composite plating layer comprising a composite material containing carbon particles and Sb in an Ag layer, with a carbon content of 6.0 mass % or more and a Sb content of 0.5 mass % or more.