Surface-Coated Cutting Tool with Ti Multilayers for Deposition Resistance
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Solution Overview
Problem
Existing surface-coated cutting tools face challenges with deposition resistance, as they are either rough on the cutting edge portion or have insufficient deposition resistance, leading to inadequate performance in high-temperature cutting operations.
Innovation Solution
A surface-coated cutting tool with a multilayer structure containing titanium, featuring a titanium carbide and titanium nitride layer stack, and an aluminum oxide layer, along with voids in the interface between the inner and outer layers, to enhance deposition resistance and maintain wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional coating is applied to improve wear resistance, then wear resistance is improved, but deposition resistance remains insufficient
Solution Approach 1:
The coating is divided into multiple functional layers: an inner layer containing an aluminum oxide layer for deposition resistance, and an outer layer containing titanium carbide and titanium nitride for wear resistance. This segmentation allows each layer to specialize in one function, resolving the contradiction between wear resistance and deposition resistance.
Solution Approach 2:
The coating uses composite material structure combining different ceramic materials (aluminum oxide, titanium carbide, titanium nitride) with distinct properties. The inner layer uses aluminum oxide for its non-stick properties, while the outer layer uses titanium carbide and nitride for hardness and wear resistance, achieving both requirements simultaneously.
2Reliability
If the coating surface is made rough to increase deposition resistance, then deposition resistance is improved, but cutting edge quality deteriorates
Solution Approach 1:
The coating applies different surface qualities to different regions: the inner layer provides a slightly rough surface for deposition resistance, while the outer layer provides a smooth, hard surface for cutting edge quality. This local differentiation resolves the contradiction between deposition resistance and cutting edge quality.
Data Source
AI summary
A surface-coated cutting tool includes a substrate and a coating that is disposed on the substrate and formed so as to cover at least a portion of a flank face, in which the coating includes an inner layer and an outer layer formed on the inner layer, the inner layer is formed of at least one layer and includes an aluminum oxide layer as a layer in contact with the outer layer, the outer layer has a multilayer structure that includes three or more layers stacked on top of one another, and each of the layers that constitute the multilayer structure contains titanium.