Journal
ULTRASONICS SONOCHEMISTRY
Volume 60, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.ultsonch.2019.104760
Keywords
Cavitation erosion; Coatings; Failure mechanism; HVOF; In-situ SEM observation
Categories
Funding
- China Scholarship Council [201804910094]
- CAS-Iranian Vice Presidency for Science and Technology Joint Research Project [174433KYSB20160085]
- Chinese Academy of Sciences President's International Fellowship Initiative [2020VEA0005]
- National Natural Science Foundation of China [41706076, 31500772, 21705158]
- Natural Sciences and Engineering Research Council of Canada Discovery Grant [NSERC RGPIN-2018-04298]
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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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