Abstract
In order to study the effect of coating deposition on cermets and cemented carbides properties, Ti(C,N)-based cermets and YT15 cemented carbides were prepared by powder metallurgy technique, and then coated by CVD and PVD. The microstructure and elemental contents of the coatings were analyzed by SEM and EDS. The scratches, friction coefficient and cutting performance of the coatings were tested. The results show that the CVD coatings and PVD coatings are well bonded by the combined CVD+PVD technologies. For both the cermets or cemented carbides substrate, both the adhesion force and friction coefficient are the highest for the CVD coatings, while lowest for the PVD coatings, and moderate for the combined CVD+PVD coatings. As to the substrate cermets and cemented carbides, the cutting performance is the best for the combined CVD+PVD coatings, while is worst for the CVD coatings, and moderate for the PVD coatings. The wear mechanism during cutting is mainly oxidative and abrasive wear.
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