Coated Tungsten Carbide Cutting Tool Wear Factors

Tungsten carbide is WC, TiC, TaC, NbC, VC and other refractory metal tungsten carbides and prepared by powder metallurgy from iron group metals as a binder. The tungsten carbide cutting tools are mainly TiN coating, ZrN coating, TiCN coatings, tungsten carbide cutting tools and wear resistance of the coating with many factors.

1. At low load, tungsten carbide substrate, TiN coating, ZrN coating close to the coefficient of friction, coefficient of friction when the TiCN coating at a certain range of values, TiCN coating surface to generate a more complex compound when the friction acts as a lubricant, so that friction coefficient decreases. With friction continues, the surface of the material occurs micro peeling, friction coefficient return to a normal state.

2. Tungsten carbide cutting tools coating at high speed and high load, low coefficient of friction than the load at low speed. This is because at low speed low load, the friction balls and the sample mainly localized mainly microparticles intermittent mechanical shock, will result in the coating peeling off, wear debris of these fine grains, high hardness, hindered and sliding friction of the sample, causing friction coefficient; and under high pressure, the contact surface friction increase participation and improve the wear surface was in contact stiffness, friction is converted to mechanical friction, the friction coefficient is relatively lower.

3. Wear Mechanism tungsten carbide cutting tools coated abrasive wear, friction under high load high speed state, the lowest friction coefficient ZrN coatings, friction best performance. Because the tool is often used for high-speed cutting tool material for this performance has very important significance.

4. Tungsten carbide coated with the coating hardness wear Obviously, microstructure has a close relationship, the higher the hardness, the more uniform coating of dense tissue microstructure, wear the better.

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