Nanolayered Coated Cutting Tool for Wear and Heat Resistance
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Solution Overview
Problem
Conventional coated cutting tools with AlCr-based nitride coatings have limitations in durability, particularly due to the presence of aluminum nitride with a hexagonal closest packed structure, which affects their wear resistance and heat resistance.
Innovation Solution
A coated cutting tool design featuring a layered coating film with alternating Al-rich AlCr-based and AlTi-based nitride or carbonitride layers, where each layer has a thickness of 50 nm or less, and a specific composition that reduces the amount of aluminum nitride with a hexagonal closest packed structure, enhancing adhesion and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional AlCr-based nitride coating is used, then the coating provides basic wear resistance and heat resistance, but the durability is insufficient due to the presence of aluminum nitride with hexagonal closest packed structure
Solution Approach 1:
The coating is divided into multiple thin layers (50 nm or less each) with alternating compositions of AlCr-based nitride and AlTi-based nitride, creating a nanolayered structure that prevents the formation of hexagonal AlN while maintaining durability
Solution Approach 2:
The invention uses a composite coating structure combining AlCr-based nitride layers and AlTi-based nitride layers in alternating sequence, where each layer is 50 nm or less in thickness, creating a nanolayered composite that eliminates hexagonal AlN formation and significantly improves durability
2Reliability
If the coating layers are made thinner to reduce hexagonal AlN formation, then the wear resistance improves, but the manufacturing process becomes more complex
Solution Approach 1:
The invention specifies precise parameter ranges: each layer thickness is 50 nm or less, Al content is 55 atom % or more in each layer, and the alternating layer structure with specific composition ratios. These controlled parameters ensure hexagonal AlN suppression while maintaining manufacturability through standardized deposition processes
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 significantly improves the durability of the coated cutting tool by reducing the amount of aluminum nitride with a hexagonal closest packed structure, leading to enhanced wear resistance and heat resistance, thereby extending tool lifespan.
Implementation Method 1
a peak intensity ascribable to a (010) plane of AlN having a hexagonal closest packed structure
Data Source
AI summary
Provided is a coated cutting tool, which includes a hard coating film containing a layer (b) formed of a nitride or a carbonitride, a layer (c) which is a layered coating film formed by alternately layering a nitride or carbonitride layer (c1) that contains 55 atom % or more of Al, Cr having a second highest content percentage, and at least B and a nitride or carbonitride layer (c2) that contains 55 atom % or more of Al and Ti having a second highest content percentage, each layer having a film thickness of 50 nm or less. A peak intensity Ih ascribable to a hcp (010) plane of AlN in the layer (c) and the total peak intensity Is ascribable to a plurality of predetermined crystal phases satisfy a relationship of Ih×100/Is≤15.