Relationship Tungsten Carbide Coated Tool Coating Hardness and Thickness of The Tool Wear

Tungsten carbide coated tool hardness and thickness of the coating of the tool wear plays a great influence, the higher the hardness, wear resistance is also relatively higher. However, the high hardness, crack sensitivity of the coating is also increased. The coating is too thin, can not protect the base material, the wear resistance relatively badly; thick coating, the residual stress due to the difference in thermal expansion coefficient between the coating and the substrate material is produced on a large, excessive residual stress will cause cracks produced, thereby reducing the strength of the material. Therefore, the coating thickness should be appropriate. Coating interfacial bonding force matching coat and showed good tool materials, combined with strength, long service life of the tool. Tool material and the coating material matching the better, the closer the coefficient of thermal expansion, the tool will have a high thermal conductivity and heat resistance.