Friction and wear behavior of polycrystalline diamond at temperatures up to 700 °C

► The friction coefficient of the PCD is different depending on the temperature, and decreases with the increase of temperature. ► The surface damage of the PCD appears to happen around 600 °C accompanied by extensive Co phase extrusion out of PCD. ► Numerous micro-cracks both at the grain boundaries and in the grains are observed with the increase of temperature to 700 °C.