Microstructure and cavitation erosion behavior of sputtered NiCrAlTi coatings with and without N incorporations

Zhengliang Liu^1,2，Shenglong Zhu²，Mingli Shen²，Yixuan Jia^1,2，Wen Wang²，Fuhui Wang³

1. School of Materials Science and Engineering, University of Science and Technology of China2. Corrosion and Protection Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences3. Corrosion and Protection Division, Shenyang National Laboratory for Materials Science, School of Materials Science and Engineering, Northeastern University

摘 要：The NiCrAlTi coatings free of N and with N incorporations were deposited on austenitic stainless steel304 L by magnetron sputtering in Ar and in gas mixture of Ar and N2, respectively. The N incorporated in the coatings existed as nitride precipitates(from ～3 vol.% to ～17 vol.%) after vacuum annealing. All the NiCrAlTi coatings, whatever free of N or with N incorporations, exhibited better resistance against cavitation erosion than ion plating Ti N coating and the substrate 304 L in ultrasonic cavitation tests. The NiCrAlTi coating free of N incorporation presents superior cavitation erosion resistance. However, the nitrogen incorporation within the NiCrAlTi coatings showed negative effects on the resistance against cavitation erosion.

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