Coated Cutting Tool Interface Layer for Stronger Coating Adhesion
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Solution Overview
Problem
Existing coated tools face challenges in achieving strong adhesion between the base and coating layer, leading to reduced wear resistance and fracture resistance, particularly in cutting tools like end mills.
Innovation Solution
Incorporating a coating adhesion phase at the interface between the base and coating layer, composed of metal compounds containing Ti, W, and Co, enhances adhesion and improves wear resistance and fracture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a coating layer is formed on a base of cemented carbide to improve wear resistance, then wear resistance is improved, but adhesion between the base and coating layer deteriorates
Solution Approach 1:
The patent introduces a coating adhesion phase as an intermediary layer between the cemented carbide base and the coating layer. This adhesion phase contains specific metal compounds (carbide, nitride, or carbonitride with Ti and W, plus Co) that mediate the bonding between the base and coating, solving the adhesion problem while maintaining wear resistance.
Solution Approach 2:
The patent creates a composite structure by incorporating a coating adhesion phase with specific composition (metal compounds containing Ti, W, and Co) into the cemented carbide base. This composite approach allows the base to have both good adhesion to the coating layer and maintained mechanical properties.
Data Source
AI summary
A coated tool in a non-limiting embodiment of the present disclosure includes a base and a coating layer located on a surface of the base. The base includes a coating adhesion phase containing at least one kind of metal compound selected from carbide, nitride, and carbonitride, each of which contains Ti and W, and Co. The coating adhesion phase is located at an interface between the base and the coating layer. A cutting tool in a non-limiting embodiment of the present disclosure includes a holder that extends from a first end toward a second end and includes a pocket on a side of the first end, and the coated tool located in the pocket.