Gradient Tungsten Carbide Cutting Tools Characteristics

Gradient tungsten carbide cutting tools can be seen as a kind of coated tungsten carbide cutting tools, but can be seen as an extension of the coated substrate gradient of research. Surface coated with a thin layer of tungsten carbide cutting tools with high hardness wear-resistant coating material, can greatly improve the tungsten carbide cutting tools and service life. However, due to the large difference in thermal expansion coefficients of each phase and thermal stress, it is easy to appear in the phase boundary coating flaking or cracking phenomenon. In order to prevent the crack from the surface of the material to expand and cause substrate failure, the matrix may gradient processing to continuously varying composition gradient instead of abrupt interface, eliminate the mutations physical properties, the thermal stress is minimized. Since it may well absorb the energy of the crack propagation, which can effectively prevent the crack to the inside of alloy expansion, improve the performance of cemented tungsten carbide cutting tools.

To get good performance gradient tungsten carbide coating product, in addition to selecting the coating material and control the coating process, the preparation of gradient alloy matrix is a very critical issue. Cobalt-rich alloy substrate surface with a gradient structure can improve the coating cutting edge strength, improve the coating resistance to crack propagation capacity, improve the flexural strength substrate and coating bond strength and the gradient of tungsten carbide cutting tools.


 

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