HVOF制备亚微米WC-12Co涂层的抗汽蚀性能研究

Study on Cavitation Erosion Resistance of Submicron WC-12Co Coating by HVOF

采用超音速火焰喷涂(HVOF)分别制备了微米及亚微米WC-12Co金属陶瓷复合涂层,采用超声振动汽蚀装置研究了涂层的抗汽蚀性能,使用SEM微观分析的方法对蚀坑的形貌进行了观察,并对汽蚀机理做了初步探讨。结果表明:亚微米WC-12Co涂层表现出优异的抗汽蚀性能,汽蚀率仅为微米涂层的70%左右,涂层中亚微米WC的存在是涂层抗汽蚀性能提高的主要因素。

Submicron and conventional WC-12Co coating were deposited by HVOF.The cavitation erosion resistance of the coating was studied by ultrasonic vibration cavitation equipment.Cavitation holes were observed by SEM and cavitation mechanisms were explored.The results show that the submicron WC-12Co coating demonstrates more excellent performance in cavitation erosion,cavitation rate is approximately 70% of the conventional coating.The existence of submicron WC grain in the coating is an important factor,which influences the cavitation erosion resistance of the coating.