Abstract
TiNi shape memory alloy exhibits an excellent cavitation erosion resistance. Therefore, it is an effective method for preventing cavitation erosion to apply this material as a coating. In this paper, different amounts of Cr3C2-NiCr powders were added into TiNi alloy powder in order to produce TiNi-(Cr3C2-NiCr) composite coatings sprayed by atmospheric plasma spraying. The cavitation erosion behavior was investigated by the ultrasonic vibration cavitation method. The microstructure and microhardness of the TiNi-based composite coating were characterized. The results show that the lamellar microstructures with defects, such as pores, microcracks and unmelted particles, are presented in all TiNi-based composite coatings. The appropriate addition of Cr3C2-NiCr is beneficial to reduce the porosity of the TiNi-based composite coating and promote a denser microstructure. The matrix phase of the TiNi-based composite coating is TiNi phase. After adding Cr3C2-NiCr, Cr7C3 phase, Cr3C2 phase and NiCr phase are observed in the coatings. Microhardness of TiNi-based composite coating is increased after adding Cr3C2-NiCr due to the high microhardness of Cr3C2-NiCr and the decreased porosity. The cavitation erosion resistance of TiNi-based composite coating can be significantly improved due to the dense microstructure with low porosity by the appropriate addition of Cr3C2-NiCr.
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