Thermal Expansion Coefficient and Thermal Conductivity of WC Based Cemented Carbides.

Damage of physical vapor deposition coatings of cutting tools during alloy 718 turning

“…While the TiN coating was deformed, no deformation was observed in the hardmetal because either the high-temperature strength of the hardmetal is higher than that of the TiN coating or the thermal conductivity of the TiN coating is smaller than that of the hardmetal. The thermal conductivity of the WC-Co sample by the laser flash method is reported to be 120-140 W/mK [20] and that of TiN coating by the pulsed photothermal reflectance technique is reported to be about 12 W/mK [21]; therefore, it is believed that excessive heat accumulation occurred only inside the coating and softened it, causing plastic deformation. Table 3.…”