Cutting Tool Coating With Titanium Carbonitroxide Layer
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Solution Overview
Problem
Existing cutting tools face challenges in maintaining wear resistance and welding resistance due to increased speed and efficiency in cutting processes, leading to a shorter tool life.
Innovation Solution
A cutting tool configuration featuring a substrate with a coating comprising a first alumina layer, a titanium compound layer directly on the alumina layer, and a second alumina layer on top, where the titanium compound layer includes titanium carbonitroxide and has specific nitrogen content regions for enhanced adhesiveness and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cutting speed and efficiency are increased, then productivity is improved, but tool life deteriorates due to reduced wear resistance and welding resistance
Solution Approach 1:
The coating is divided into three distinct layers (first alumina layer, titanium compound layer, second alumina layer) with specific functional assignments. The first alumina layer provides wear resistance, the titanium compound layer prevents welding, and the second alumina layer provides additional protection, allowing the tool to maintain high productivity while extending tool life through specialized layer functions.
Solution Approach 2:
The coating uses a composite structure combining aluminum oxide and titanium compounds in specific layers. This composite material approach leverages the complementary properties of each material: alumina for wear resistance and titanium compounds for welding prevention, enabling the tool to withstand higher cutting speeds while maintaining extended service life.
2Reliability
If a multi-layer coating structure is implemented, then wear resistance and welding resistance are improved, but device complexity increases
Solution Approach 1:
Each layer in the coating structure is designed with specific local properties: the first alumina layer has specific nitrogen content (0.2-11 at%) for enhanced wear resistance, the titanium compound layer (containing TiC, TiN, TiCN, or TiON) provides localized welding prevention, and the second alumina layer offers additional protection. This local quality differentiation achieves superior reliability without excessive complexity by assigning specific functions to each layer.
Solution Approach 2:
The invention controls specific parameters within defined ranges to optimize performance while managing complexity. Key parameters include nitrogen content in the first alumina layer (0.2-11 at%), layer thickness ratios, and material composition proportions. By controlling these parameters within specific ranges rather than requiring exact values, the design achieves reliable wear and welding resistance while maintaining manufacturing feasibility.
Data Source
AI summary
A cutting tool comprises a substrate and a coating provided on the substrate, the coating including a first alumina layer provided on the substrate, a titanium compound layer provided directly on the first alumina layer, and a second alumina layer provided directly on the titanium compound layer, in which a portion adjacent to the titanium compound layer in the first alumina layer serves as an interface region, a portion that is not the interface region in the first alumina layer serves as a non-interface region, a content of nitrogen in the interface region is 0.2 at % or more and 11 at % or less, and a content of nitrogen in the non-interface region is 0 at % or more and 0.15 at % or less; and the titanium compound layer comprises a layer of titanium carbonitroxide adjacent to the first alumina layer.