Cobalt Substrate Cutting Tool with Multilayer Coating for Wear Resistance
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Solution Overview
Problem
Existing cutting tools with conventional coating layers fail to provide sufficient wear resistance for cutting hard-to-cut materials like stainless steel, leading to increased cutting temperatures and diffusion wear, and the methods to improve adhesiveness between substrates and coatings often result in reduced fracture resistance.
Innovation Solution
A cutting tool with a substrate containing cobalt and a coating layer comprising a titanium nitride layer, a titanium carbonitride layer, an intermediate layer of titanium oxycarbide, titanium oxynitride, or titanium oxide, and an aluminum oxide layer with cobalt particles, which is deposited using a CVD method to enhance wear and fracture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coating layers are used on cutting tools, then the coating can be applied to the substrate, but the wear resistance is insufficient for cutting hard-to-cut materials like stainless steel
Solution Approach 1:
The patent applies composite materials by creating a multilayer coating structure consisting of alternating hard layers (titanium nitride, titanium carbonitride, aluminum oxide) and intermediate layers (titanium oxycarbide, titanium oxynitride, titanium carboxynitride). This composite structure combines the high hardness and wear resistance of ceramic materials with the crack-absorbing properties of the intermediate layers, enabling the coating to withstand the high temperatures and diffusion wear associated with cutting hard-to-cut materials like stainless steel
Solution Approach 2:
The intermediate layers composed of titanium oxycarbide, titanium oxynitride, or titanium carboxynitride serve as mediators between the hard coating layers and the substrate. These intermediate layers have intermediate physical and chemical properties that facilitate stress distribution, prevent direct contact between the substrate and harsh cutting environments, and reduce thermal shock, thereby protecting the overall coating system from failure under high temperature and mechanical stress
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 tool effectively suppresses cracks in the coating layer during heavy interrupted cutting, maintaining cutting performance over a long period with improved wear resistance and fracture resistance.
Implementation Method 1
a coating layer which includes at least a titanium nitride layer deposited on the surface of the substrate, a titanium carbonitride layer deposited on the surface of the titanium nitride layer, an intermediate layer deposited on the surface of the titanium carbonitride layer and an aluminum oxide layer deposited on the surface of the intermediate layer
Data Source
Figure 1(a)~1(b)
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AI summary
Disclosed is a cutting tool having excellent wear resistance. Specifically disclosed is a cutting tool having a substrate and a coating layer formed on a surface of the substrate. The cutting tool is characterized in that the substrate contains at least cobalt; the coating layer includes at least a titanium nitride layer formed on the surface of the substrate, a titanium carbonitride layer formed on the surface of the titanium nitride layer, an intermediate layer formed on the surface of the titanium carbonitride layer and an aluminum oxide layer formed on the surface of the intermediate layer; the intermediate layer contains at least oxygen and titanium, and the aluminum oxide layer incorporates particles composed mainly of cobalt.