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TiAlN/AlCrSiN multilayer coatings were prepared by arc ion plating. The implements of various thickness ratio (0, 0.89, 1.04, 1.14 and 1.49) of TiAlN/AlCrSiN on microstructure, mechanical properties and thermal stability of TiAlN/AlCrSiN multilayer coatings were investigated. The AlCrSiN single coating without TiAlN inserted layer exhibits a mixed-phase structure of c-AlN and c-CrN, while TiAlN/AlCrSiN multilayer coatings show a single-phase cubic structure. As the thickness ratio of TiAlN/AlCrSiN increases, the critical load of multilayer coating gradually increases up to 99 N, the hardness decreases and the thermal stability improved. The TiAlN/AlCrSiN multilayer coating with a high thickness ratio of 1.49 was able to maintain a single (200) preferred c-TiAlN/AlCrN solid solution phase structure after annealing at 800°C in Ar for 2 h. The obtained single-phase cubic structure of AlCrSiN at room temperature and the improved thermal stability properties can be explained by the template effect of TiAlN on the AlCrSiN.

Improved thermal stability of AlCrSiN coatings base on the template effect of TiAlN layer