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采用超音速火焰喷涂技术制备常规、亚微米及多峰3种WC-12Co金属陶瓷涂层,比较分析涂层的显微硬度及显微组织。采用超声振动汽蚀装置研究3种涂层的抗汽蚀性能,并采用扫描电镜观察涂层表面的汽蚀坑,探讨不同涂层的汽蚀机理。研究表明:采用超音速火焰喷涂制备的亚微米及多峰WC-12Co涂层结构致密、孔隙率低,其显微硬度明显高于常规的WC-12Co涂层。多峰WC-12Co涂层的平均显微硬度接近HV1500,远高于常规的WC-12Co涂层。在3种涂层中,多峰WC-12Co涂层表现出最优良的抗汽蚀性能,涂层的汽蚀率大约为常规涂层的40%;与常规涂层相比,多峰WC-12Co涂层的抗汽蚀性能提高150%以上。
Conventional, sub-micron and multi-peak WC-12Co cermet coatings were prepared by supersonic flame spraying. The microhardness and microstructure of the coating were compared. The cavitation erosion resistance of the three coatings was studied by ultrasonic vibration cavitation device. The cavitation pits on the coating surface were observed by scanning electron microscope, and the cavitation erosion mechanism of different coatings was discussed. The results show that the submicron and multi-peak WC-12Co coatings prepared by supersonic flame spraying have compact structure and low porosity, and their microhardness is obviously higher than that of the conventional WC-12Co coating. The average microhardness of the multimodal WC-12Co coating is close to HV 1500, which is much higher than the conventional WC-12Co coating. Among the three coatings, the multimodal WC-12Co coating showed the best anti-cavitation performance and the corrosion rate of the coating was about 40% of that of the conventional coating. Compared with the conventional coating, the multi-peak WC- The cavitation resistance of 12Co coating is increased by more than 150%.