Engine Sliding Member Coating with Precipitation-Hardened Copper Alloy
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Solution Overview
Problem
The existing hard coating methods for sliding members in internal combustion engines are insufficient in wear resistance.
Innovation Solution
A sliding member with a coating layer comprising copper alloy portions derived from precipitation-hardening copper alloy particles, where the copper alloy portions are bonded to each other via interfaces, containing nickel and silicon as additive elements, and optionally including hard particle portions and an intermediate layer, to enhance wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hard coating is formed on a sliding member surface, then the surface hardness is improved, but the wear resistance becomes insufficient
Solution Approach 1:
The patent applies composite materials by forming a coating layer containing copper alloy particles (with nickel and silicon additives) combined with hard particles on the sliding member surface. This composite structure integrates the beneficial properties of both soft copper alloy (good thermal conductivity, adhesion) and hard particles (wear resistance), resolving the contradiction between surface hardness and wear resistance
Solution Approach 2:
The patent changes the chemical composition parameters of the coating layer by incorporating specific additives (nickel: 1-10 wt%, silicon: 1-10 wt%) into the copper alloy particles. These parameter changes enhance both the hardness and wear resistance of the coating while maintaining thermal conductivity, addressing the technical contradiction
2Reliability
If a hard coating is applied to sliding surfaces, then the coating provides initial protection, but porosity reduces thermal conductivity and adhesion
Solution Approach 1:
The patent changes the microstructural parameters of the coating layer by controlling particle size distribution (0.1-10 μm), copper alloy content (5-80 wt%), and additive concentrations. These parameter optimizations reduce porosity formation while maintaining thermal conductivity pathways through the copper alloy matrix, resolving the contradiction between coating protection and thermal energy loss
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 solution provides a sliding member with excellent wear resistance, improved thermal conductivity, and reduced porosity, effectively addressing the wear resistance issues of existing hard coatings.
Implementation Method 1
a coating layer formed on the base substrate, wherein the coating layer includes copper alloy portions (21) derived from precipitation-hardening copper alloy particles
Implementation Method 2
the metal powder is made of a metal material that can cause strain-induced transformation, which is sprayed onto the base substrate at such a high speed that causes the strain-induced transformation, so that the metal powder is plastically deformed into a flat shape and is deposited as layers on the surface of the base substrate
Data Source
AI summary
A sliding member includes a base substrate and a coating layer formed on the base substrate. The coating layer includes a copper alloy part derived from a plurality of precipitation hardening copper alloy particles. The copper alloy parts are bonded to each other via interfaces between the copper alloy parts. The copper alloy part contains nickel and silicon as additive elements. The copper alloy part contains 2 to 5 percent by mass of nickel.A sliding member for an internal combustion engine includes the sliding member at a sliding part of the internal combustion engine.