In-situ SEM observations of ultrasonic cavitation erosion behavior of HVOF-sprayed coatings

材料科学 空化 热喷涂 纳米晶材料 复合数 涂层 微观结构 复合材料 相(物质) 无定形固体 声化学 冶金 纳米技术 物理 有机化学 化学 机械
作者
Haijun Zhang,Xiuyong Chen,Yongfeng Gong,Ye Tian,André McDonald,Hua Li
出处
期刊:Ultrasonics Sonochemistry [Elsevier BV]
卷期号:60: 104760-104760 被引量:52
标识
DOI:10.1016/j.ultsonch.2019.104760
摘要

Several typical high-velocity oxy-fuel (HVOF)-sprayed coatings, including WC-10Co4Cr coatings, Co-based coatings, WC-10Co4Cr/Co-based composite coatings, and Fe-based amorphous/nanocrystalline coatings were fabricated, and their cavitation behavior was evaluated in deionized water. Further, in-situ SEM surface observations were used to understand the microstructure of tested coatings. The results show that cavitation erosion initially occurred at pre-existing defects in the coatings. Meanwhile, it was found that cavitation erosion damage of the WC-10Co4Cr/Co-based composite coating, which contained a hard reinforcing phase (WC-10Co4Cr phase) and a soft matrix phase (Co-based phase), preferentially occurred at or around pores and microcracks in the reinforcement, rather than in the defect free matrix. This suggested that defects were a critical contributing factor to cavitation damage of the composite coatings. Furthermore, a mechanism was suggested to explicate the cavitation behavior of composite coatings. The approach of using in-situ SEM surface observations proved to be useful for the analysis of the cavitation mechanism of engineering materials and protective coatings.
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