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.

TiNi形状记忆合金具有出色的抗气蚀性。因此，将这种材料用作涂层是防止气蚀的有效方法。在本文中，将不同量的Cr ₃ C ₂ -NiCr粉末添加到TiNi合金粉末中，以生产TiNi-（Cr ₃ C ₂-NiCr）复合涂层，通过大气等离子喷涂进行喷涂。用超声振动空化方法研究了空化腐蚀行为。表征了TiNi基复合涂层的组织和显微硬度。结果表明，在所有TiNi基复合涂层中均出现了具有缺陷（如孔隙，微裂纹和未熔化颗粒）的层状微结构。适当添加Cr ₃ C ₂ -NiCr有助于降低TiNi基复合涂层的孔隙率并促进致密的微观结构。TiNi基复合涂层的基体相为TiNi相。添加Cr ₃ C ₂ -NiCr后，Cr ₇ C ₃相，Cr在涂层中观察到₃ C ₂相和NiCr相。基于钛镍基复合涂层的显微硬度为添加Cr后增加₃ c ^ ₂ -NiCr由于Cr的高硬度₃ c ^ ₂ -NiCr和孔隙率的降低。通过适当地添加Cr ₃ C ₂ -NiCr，由于具有低孔隙率的致密微观结构，可显着改善TiNi基复合涂层的抗气蚀性。