Abstract
Compared with TiN coating and TiAlN coating, the TiAlSiN superhard coating has more outstanding comprehensive properties. However, the TiAlSiN superhard coating has different physical properties from the substrate, which causes large internal stress at the interface, and reduces the bonding strength of the coating and the substrate. In this paper, according to the design criteria of nano-micron multilayer structure coating, a multilayer gradient TiAlSiN coating is designed to improve the bonding strength of TiAlSiN superhard coating, and studying the bonding strength and mechanical properties after high temperature oxidation of TiAlSiN multilayer gradient coatings prepared by cathodic arc ion plating. The results show that the designed multilayer gradient structure TiAlSiN coating has four layers: TiN layer, TiAlN layer, TiAlSiN layer and TiSiN layer. The bonding strength of the TiAlSiN multilayer gradient coating conforms to the industrial grade HF1 and it maintains good bonding properties and mechanical properties in a high temperature environment below 1000°C. It is expected to provide reference for the study and design of improving the bonding strength of the coating.
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