Tungsten-Ditungsten Carbide Coating for Heat-Resistant Cutting Tools
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Solution Overview
Problem
Cutting tools face challenges in maintaining longevity during high heat load environments, such as milling titanium alloys, due to issues with breakage and wear resistance.
Innovation Solution
A cutting tool with a coating film comprising a first layer of metal tungsten and hexagonal ditungsten carbide, and optionally additional layers, applied to a substrate like cemented carbide or ceramic, which enhances breakage and wear resistance through specific thickness and composition configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a coating film containing cubic tungsten carbide is applied to a substrate, then wear resistance is improved, but breakage resistance deteriorates under high heat load conditions
Solution Approach 1:
The invention changes the material composition parameters by using metal tungsten and hexagonal ditungsten carbide instead of conventional cubic tungsten carbide, and optimizes the elastic deformation rate to 43.0-58.0%, which resolves the contradiction between wear resistance and breakage resistance under high heat load conditions
Solution Approach 2:
The invention creates a composite coating film combining metal tungsten and hexagonal ditungsten carbide in specific proportions, where the metal tungsten provides ductility and breakage resistance while the hexagonal ditungsten carbide provides wear resistance, achieving both requirements simultaneously
Data Source
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AI summary
A cutting tool includes a substrate and a coating film that is disposed on the substrate, wherein the coating film includes a first layer composed of metal tungsten and hexagonal ditungsten carbide, and the first layer has an elastic deformation rate of 43.0 or more and 58.0 or less.