Ti Interlayer Coated Cutting Tool for Stronger Coating Adhesion
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Solution Overview
Problem
Existing coated tools face challenges in improving the adhesion between the coating layer and the base body, which affects wear resistance and durability.
Innovation Solution
A coated tool design featuring a WC-based cemented carbide base body with a coating layer and an intermediate layer containing Ti, where the intermediate layer has an average thickness of 1 nm or more and 15 nm or less, enhancing adhesion between the base body and the coating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a coating layer is applied directly on the base body to improve wear resistance, then wear resistance is improved, but adhesion between the coating layer and base body deteriorates
Solution Approach 1:
An intermediate layer containing Ti is introduced between the base body and the coating layer. This intermediate layer serves as a mediator that improves adhesion between the coating layer and the WC-based cemented carbide base body, while allowing the coating layer to maintain its wear resistance properties.
Solution Approach 2:
The coating structure is designed as a composite system consisting of the base body, an intermediate layer containing Ti, and the coating layer. This composite structure combines the advantages of each layer to achieve both strong adhesion and high wear resistance.
2Reliability
If the intermediate layer thickness is increased to improve adhesion, then adhesion is improved, but coating layer integrity deteriorates
Solution Approach 1:
The thickness of the intermediate layer is precisely controlled within the range of 1 nm to 15 nm. This parameter optimization ensures that the intermediate layer is thick enough to provide adequate adhesion improvement while remaining thin enough to maintain coating layer integrity and prevent defects.
Data Source
AI summary
A coated tool according to the present disclosure includes a base body made of WC-based cemented carbide containing WC particles as a hard phase component and Co as a main component of a binding phase, a coating layer located on the base body, and an intermediate layer located between the base body and the coating layer. The intermediate layer contains Ti, and has an average layer thickness of 1 nm or more and 15 nm or less. The coating layer includes a first coating layer in contact with the intermediate layer. The first coating layer includes at least one element selected from the group consisting of Al, Group 5 elements, Group 6 elements, and Group 4 elements except for Ti, at least one element selected from the group consisting of C and N, Si, and Cr.