Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; Cixi Institute of Biomedical Engineering, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; Department of Mechanical Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
Ultrason Sonochem. 2020 Jan;60:104760. doi: 10.1016/j.ultsonch.2019.104760. Epub 2019 Aug 29.
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.
制备了几种典型的高速氧燃料（HVOF）喷涂涂层，包括 WC-10Co4Cr 涂层、Co 基涂层、WC-10Co4Cr/Co 基复合涂层和 Fe 基非晶/纳米晶涂层，并在去离子水中评估了它们的空蚀行为。此外，还采用原位 SEM 表面观察来了解测试涂层的微观结构。结果表明，空蚀最初发生在涂层的现有缺陷处。同时，发现含有硬增强相（WC-10Co4Cr 相）和软基体相（Co 基相）的 WC-10Co4Cr/Co 基复合涂层的空蚀损伤优先发生在增强体中的孔隙和微裂纹处或其周围，而不是在无缺陷的基体中。这表明缺陷是复合涂层空蚀损伤的一个关键因素。此外，提出了一种解释复合涂层空蚀行为的机制。使用原位 SEM 表面观察的方法被证明对分析工程材料和防护涂层的空蚀机制很有用。
