Tungsten Carbide Cutting Tool Coating Process Parameters Influence(A)

Tungsten carbide cutting tool coating performance largely depends on the quality of the coating process and the coating, the coating quality preparation include: coating density, texture, microstructure, structural defects, residual stress. Tungsten carbide cutting tool coating process parameters include a deposition temperature, arc current, N2 partial pressure, a negative bias, coating time, the degree of vacuum and the like.

1. The deposition temperature
Tungsten carbide cutting tool coating deposition temperature on the microstructure, hardness and adhesion plays a crucial role. Temperature is too low, non-uniform nucleation, is loose, thick tissue, film hardness, adhesion, poor abrasion resistance and other mechanical properties; temperature is too high, the substrate surface is overheating, is obtained coarse crystalline organization, lower hardness. Only a suitable temperature to obtain a dense columnar crystals, the atomic arrangement of the film hardness due to more regular, reduced porosity and increased reasons.

2. The arc source current
Under certain bias, arc source current determines the temperature and macroscopic mechanical properties of the matrix, the target current increases, the substrate temperature, the crystal growth from the column to a dense crystalline equiaxed growth and transformation, tungsten carbide cutting tool coating With the improvement of hardness.


 

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