A study of oxidation behavior of AlTiN-and AlCrN-based multilayer coatings

作者：Xiao, Baijun; Li, Haixu; Mei, Haijuan; Dai, Wei; Zuo, Fei; Wu, Zhengtao^*; Wang, Qimin^*

来源：Surface and Coatings Technology, 2018, 333: 229-237.

DOI：10.1016/j.surfcoat.2017.10.078

• AlCrN-and AlTiN-based multilayer
• Thermogravimetric analysis
• High temperature oxidation
• Oxidation mechanism

In this work, AlTiN/TiSiN and AlCrN/TiSiN multilayer coatings were deposited by arc ion plating on Al2O3 and cemented carbide substrates. The oxidation resistances of the coatings were studied under isothermal conditions up to 1000 degrees C. The oxidation behaviors of the multilayer coatings were studied by means of cross-sectional SEM (X-SEM), energy dispersive X-ray (EDX) maps analysis, X-ray diffraction (XRD) and EDX line-scanning after oxidation at 800 degrees C, 900 degrees C and 1000 degrees C in air for 2 h. The oxide scale formed on the surface region of the AlTiN/TiSiN coating illustrates a mixture of porous (Al, Ti)-Oxide scale. On the contrary, the oxide scale of the AlCrN/TiSiN coating mainly consists of a mixed (Ti, Al)-oxide scale outside layer and a dense (Al, Cr)(2)O-3 inner layer. During the isothermal oxidation, the AlCrN/TiSiN coating exhibits lower weight increment. The oxidation result shows that the AlCrN/TiSiN multilayer coating exhibits more considerable oxidation resistance than that of the AlTiN/TiSiN coating. The formation of a dense protective mixed (Al, Cr)-oxide scale beneath the TiSiN layer acts as a barrier layer, blocking the outward diffusion of the Al, Ti and Cr atoms and retarding inward diffusion of oxygen into the AlCrN/TiSiN coating.

• 出版日期2018-1-15
• 单位广东工业大学