Graphene-Coated Ceramic Sliding Member for Abrasion Resistance
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Solution Overview
Problem
Ceramic components with graphene filler exhibit low hardness and modulus of elasticity, leading to reduced abrasion resistance, making them unsuitable for mechanically and thermally impacted systems.
Innovation Solution
A ceramic component with a particulate support material coated using a graphene-containing material, where the graphene is derived from a dopamine-containing carbon source, forming a strong bond that enhances electrical conductivity and abrasion resistance, and includes a mixture of particulate and coated support materials for improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If graphene filler is added to ceramic components, then electrical conductivity is improved, but hardness and modulus of elasticity decrease
Solution Approach 1:
The patent creates a composite material system where graphene-coated ceramic particles are embedded in a ceramic matrix. The graphene coating on the particles provides conductive pathways while the ceramic matrix maintains structural strength. This composite approach allows simultaneous achievement of electrical conductivity through graphene networks and mechanical strength through the ceramic base material.
Solution Approach 2:
The invention applies graphene selectively as a coating on the surface of ceramic particles rather than uniformly mixing it throughout. This localized application ensures that graphene provides its conductive function at particle interfaces and surfaces, while the bulk ceramic material retains its inherent hardness and mechanical properties. The coating thickness and coverage can be optimized to balance conductivity and mechanical strength.
2Reliability
If graphene is added to ceramic components, then electrical conductivity is improved, but abrasion resistance decreases
Solution Approach 1:
The composite structure combines graphene-coated particles with a hard ceramic matrix. The ceramic matrix provides abrasion resistance while the graphene coating on particles maintains electrical conductivity. The synergistic combination allows the material to resist wear from the ceramic phase while conducting electricity through the graphene phase.
Solution Approach 2:
Graphene is applied as a surface coating on ceramic particles rather than being distributed throughout the bulk material. This localized presence ensures that the hard ceramic surfaces face the wear environment, providing abrasion resistance, while the graphene coating at particle boundaries and surfaces establishes conductive pathways without compromising the wear-resistant surface properties.
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 ceramic component achieves high hardness, modulus of elasticity, and fracture toughness, ensuring high abrasion resistance and stability under mechanical and thermal impacts while maintaining good sliding properties and electrical conductivity.
Implementation Method 1
wherein a dopamine-containing carbon source is used as the starting material for the graphene-containing material
Implementation Method 2
The material bond may be characterized by physical and/or chemical interactions between the particulate support material and the graphene-containing material
Data Source
AI summary
The invention relates to a sliding member having a first sliding surface, wherein the first sliding surface (29) comprises a particulate support material (6) and a graphene-containing material (7), wherein the particulate support material (6) is at least partially coated with the graphene-containing material (7), and wherein a material bond (14) is present between the particulate support material (6) and the graphene-containing material (7).