Sliding Mechanism with Dispersed Hard Phase
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Solution Overview
Problem
Heat-resistant copper alloys used in high-temperature sliding applications have low heat conductivity and poor high-temperature abrasion resistance due to the formation of solid solutions with zinc, leading to adhesion issues and reduced performance.
Innovation Solution
A sliding mechanism comprising a first sliding member with a dispersed hard phase, embedded in a copper or copper alloy matrix, and a second sliding member harder than the matrix, which enhances both high-temperature abrasion resistance and heat conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If copper forms solid solution with zinc and other elements to create heat-resistant copper alloy, then the alloy achieves high strength and corrosion resistance, but the heat conductivity decreases significantly (to 60-110 W/m·K compared to pure copper)
Solution Approach 1:
The invention uses a composite material structure consisting of a copper-based matrix phase combined with dispersed hard phase particles (such as oxide particles). This composite structure allows the soft copper matrix to maintain high heat conductivity while the dispersed hard particles provide strength reinforcement, achieving both high strength and high heat conductivity simultaneously
Solution Approach 2:
The invention applies local quality by creating a non-uniform microstructure where the matrix phase maintains copper's inherent high heat conductivity while localized hard phase particles are distributed throughout to provide strength. This localized reinforcement approach preserves the overall heat conduction pathways while adding strength where needed
2Strength
If copper forms solid solution with zinc and other elements, then the alloy achieves high strength, but the melting point decreases and adhesion to partner members occurs easily in high-temperature environments, resulting in poor high-temperature abrasion resistance
Solution Approach 1:
The composite material structure with dispersed hard phase particles (oxide particles) in the copper matrix provides high-temperature stability. The hard particles maintain structural integrity at elevated temperatures, preventing adhesion to partner members and maintaining abrasion resistance where pure copper alloys would fail
Solution Approach 2:
The invention changes the material parameters by introducing oxide particles with high melting points into the copper matrix. This parameter change (adding high-melting-point particles) raises the effective temperature threshold for adhesion and maintains abrasion resistance in high-temperature environments
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 configuration provides a sliding mechanism with improved high-temperature abrasion resistance and heat conductivity, effectively addressing the limitations of existing heat-resistant copper alloys by utilizing the hard phase for abrasion resistance and the continuous matrix for heat conductivity.
Implementation Method 1
a hard phase that is harder than the matrix phase, in which the hard phase is embedded in the matrix phase in a dispersed state
Data Source
AI summary
A sliding mechanism 1 includes a first sliding member 10 and a partner second sliding member 20 configured to slide relative to the first sliding member 10. The first sliding member 10 includes a matrix phase 11 and a hard phase 13 that is harder than the matrix phase 11, in which the hard phase 13 is embedded in the matrix phase 11 in a dispersed state. The second sliding member 20 includes a base 21 and a surface-treatment layer 23 that is formed on the sliding surface 20 of the base 21 and is harder than the matrix phase 11.