Multilayer Cutting Tool Coating for Hot Nickel-Alloy Machining
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Solution Overview
Problem
Cutting tools experience reduced life due to high cutting edge temperatures during machining of nickel-based alloys, particularly in high-efficiency applications, leading to a need for improved durability and longevity.
Innovation Solution
A cutting tool with a coating comprising an alternate layer of AlaTi(1-a-b)SibN and AlcCr(1-c-d)AgdN unit layers, where a and b satisfy specific ranges, providing enhanced hardness, heat resistance, and lubricity, while the layer structure suppresses crack propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional coatings are used on cutting tools, then the tool can perform basic cutting functions, but the tool life is reduced due to high cutting edge temperatures during machining of nickel-based alloys
Solution Approach 1:
The coating is segmented into multiple alternating layers with different compositions (AlaTi(1-a-b)SibN and AlcCr(1-c-d)AgdN), where each layer has specific thickness ranges (2-50 nm). This segmented multi-layer structure allows different layers to perform different functions: some layers provide heat resistance while others provide hardness and lubricity, collectively resolving the contradiction between withstanding high temperatures and maintaining tool life
Solution Approach 2:
The invention uses composite coating materials with specific compositional ranges (0.50≤a≤0.75, 0.005≤b≤0.20, 0.50≤c≤0.85, 0.005≤d≤0.20) to create a coating that simultaneously provides heat resistance, hardness, and lubricity. The composite nature of the coating allows it to resist high cutting edge temperatures while extending tool life during high-efficiency machining of nickel-based alloys
Data Source
AI summary
A cutting tool, comprising a substrate and a coating disposed on the substrate,wherein the coating comprises a first layer,the first layer consists of an alternate layer in which a first unit layer and a second unit layer are alternately stacked,the first unit layer is composed of AlaTi(1-a-b)SibN,the second unit layer is composed of AlcCr(1-c-d)AgdN,the a, the b, the c, and the d satisfy0.50≤a≤0.75,0.005≤b≤0.20,0.50≤c≤0.85, and0.005≤d<0.10,an average thickness of the first unit layer is 2 nm or more and 50 nm or less, andan average thickness of the second unit layer is 2 nm or more and 50 nm or less.