Progress Review on Preparation of Hard Coating on Cermet Surface and Its Bonding Strength with Substrate

Cermet is widely used in manufacturing cutting tools because of its excellent strength, high temperature thermal conductivity and thermal stability of metal materials, and high temperature resistance and corrosion resistance of ceramic materials. The lack of wear resistance and hardness of cermet limits its application range, which can be solved by preparing hard coating on its surface, but the bonding strength of the coating is weak, resulting in peeling off of the coating. The preparation method of the hard coating, the influencing factors on the bonding strength between the coating and the substrate are introduced, and the methods to improve the bonding strength of the hard coating are expounded. Finally, the preparation technique and the improvement of bonding strength of hard coating on cermet surface are prospected.