Cutting tool with coating and preparation method thereof

Abstract

The cutting tool with the coating comprises a tool base body and coating layers formed on the tool base body in a sequentially deposited mode through a CVD method, each coating layer is of a multi-layer structure and sequentially comprises a TiAlN gradient coating and a TiAlN gradient coating from inside to outside, the TiAlN gradient coating is represented by the general formula Ti1-xAlxN, x is larger than or equal to 0.5 and smaller than or equal to 0.9, and x is larger than or equal to 0.5 and smaller than or equal to 0.9. The Al content in the TiAlN gradient coating is increased in a gradient manner from low to high from the side close to the cutter base body to the side far away from the cutter base body; the composite material comprises an AlOCN layer, a TiAlOCN layer and an alpha-Al2O3 coating, and the alpha-Al2O3 coating is provided with an integral fiber texture. According to the cutting tool and the preparation method thereof, the coating hardness is high, distribution is uniform, and the binding force between the coating and the base body is high.

Description

technical field [0001] The invention belongs to the field of cutting tool production and manufacture, and in particular relates to a coated cutting tool and a preparation method thereof. Background technique [0002] The modern manufacturing industry is developing in the direction of high efficiency and environmental protection. The proportion of high-speed and dry machining is getting higher and higher, and higher requirements for the performance of tools are constantly being put forward. Ordinary carbide cutting tools can no longer meet the development trend of modern manufacturing. As a result, a variety of coated carbide tools have been developed and successfully used in modern manufacturing. [0003] At present, the use of chemical vapor deposition (CVD) method to prepare coated cemented carbide tools is still an important way for enterprise production, and the CVD method has the following advantages: thicker coatings can be prepared, the surface quality of the coating...

AI Technical Summary

Problems solved by technology

[0006] However, the current coated tools have the following problems: First, during the growth process of the TiAlN coating, as the thickness increases, the coating grains will also grow, thereby reducing the hardness of the coating itself; Due to the large residual stress caused by the different material properties between the material and the substrate, the bonding force between the coating and the substrate and the gradient coating is poor

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