Cemented carbide coated inserts are widely used in ordinary steel finishing and semi-finishing and roughing. Coating material includes: TiC, TiN, TiCN, and AL2O3 composite. Carbide the gold blade CVD coating process, the common coating structure is: TiN-Al2O3-TiCN-matrix.
TiC coating has high hardness and wear resistance, oxidation resistance is also good, cutting can produce titanium dioxide film, effectively reduce the coefficient of friction and reduce tool wear. The general cutting speed can be increased by about 40%. TiC and steel is a high bonding temperature, the surface of the crystal grains finer, and rarely produce BUE cutting, suitable for finishing. The TiC coating drawback is formed between the linear expansion coefficients of the base body large difference with the substrate, a fragile decarburized layer, reducing the flexural strength of the tool. Therefore, heavy cutting, the machining of hard material or the workpiece with the inclusions, the coating is easy to crack.
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