Silicon Carbide Sealing Member With Uniform Graphite Dispersion
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Solution Overview
Problem
Existing sealing members made of silicon carbide-graphite composites suffer from non-uniform dispersion of graphite particles, leading to reduced hardness, wear resistance, and lubricity, resulting in uneven wear and shortened lifespan due to locally non-uniform dispersion and increased wear during long-term use.
Innovation Solution
The sealing member is manufactured by dispersing cylindrical or polygonal columnar graphites in a silicon carbide substrate, with controlled spacing and orientation, followed by filling with a silicon carbide and binder composition, pressing, machining, and sintering to achieve uniform distribution and improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a significant amount of graphite particles are dispersed in the silicon carbide substrate to improve lubricity, then the lubricity increases, but the hardness and wear resistance of the silicon carbide-graphite composite decrease
Solution Approach 1:
The invention applies local quality by creating distinct regions within the composite material: a silicon carbide substrate providing hardness and wear resistance, and graphite particles dispersed throughout providing lubricity. Each component maintains its local functional properties rather than requiring uniform distribution of a single material.
Solution Approach 2:
The invention uses composite materials by combining silicon carbide and graphite particles to create a material that exhibits properties of both components - the hardness and thermal conductivity of silicon carbide plus the self-lubricating properties of graphite.
2Ease of operation
If fine graphite particles are dispersed in the silicon carbide substrate, then the lubricity improves, but it is difficult to uniformly control the graphite particles leading to non-uniform dispersion
Solution Approach 1:
The invention applies preliminary action by pre-mixing the graphite particles with the silicon carbide powder before forming the composite material. This preliminary mixing ensures uniform distribution of graphite particles throughout the silicon carbide matrix, avoiding the problem of non-uniform dispersion that occurs when particles are added later.
Solution Approach 2:
The invention uses parameter changes by controlling the particle size of graphite within a specific range (1-10 μm) and adjusting the mixing parameters during manufacturing. These parameter optimizations enable uniform dispersion of fine graphite particles throughout the silicon carbide substrate.
3Ease of operation
If graphite particles are dispersed in the silicon carbide substrate, then the self-lubricating effect improves, but the specific gravity and mechanical strength of the product are degraded
Solution Approach 1:
The invention applies parameter changes by optimizing the graphite particle size to 1-10 μm and controlling the graphite content within specific ranges. These parameter optimizations maintain mechanical strength and specific gravity while achieving the desired self-lubricating effect.
Solution Approach 2:
The invention uses composite materials to combine the advantages of both silicon carbide (high strength and specific gravity) and graphite (self-lubricating effect), creating a material that exhibits properties of both components simultaneously rather than sacrificing mechanical properties for lubricity.
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 resulting sealing member exhibits enhanced hardness, wear resistance, and lubricity, ensuring smooth mechanical operation and thermal conductivity, thereby extending its lifespan and effectiveness in sealing gaps between rotating and fixed elements.
Implementation Method 1
a friction surface of the sealing member is made of a composite material of graphite and silicon carbide to have lubricity and wear resistance at the same time
Implementation Method 2
excellent thermal conductivity to prevent thermal deformation
Implementation Method 3
a method for manufacturing the same
Data Source
AI summary
The present invention provides a sealing member which includes a substrate including silicon carbide; and a plurality of cylindrical or polygonal columnar graphites dispersed in the substrate, and a method for manufacturing the same.