Friction and Wear Properties of Tungsten Carbide Cutting Tools

In each tungsten carbide cutting tool friction processes follow a similar law, namely the initial dynamic friction coefficient have experienced a rapid increase in the transition period from the initial value, and then remained relatively stable and fluctuated in a stable phase characteristics. Initially, under normal loading, the friction surface is only partially asperity contact, a smaller adhesive area, the contact surface of the molecular attraction is small, the friction coefficient is small; as rubbing process, interfere asperity gradually being polished, adhesion area increases, the molecular attraction also increases, resulting in friction coefficient increases. The whole process is the carbide friction contact surface mount constantly, then they continue to cut under shear stress process. Since the surface of Co phase peeling, crushing the sample surface caused by wear, local surface adhesion soon reach a dynamic equilibrium, causing the friction coefficient of the surface is maintained in a more stable range, called the stationary phase.