Erosion resistance of HVOF/AC-HVAF sprayed WC-10Co-4Cr coatings
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摘要: 采用高速火焰热喷涂系统（HVOF/AC-HVAF）在0Cr13Ni5Mo不锈钢表面制备了三种组织结构不同的WC-10Co-4Cr涂层，通过料浆罐冲蚀试验机对三种涂层和0Cr13Ni5Mo基材的冲蚀行为和冲蚀机制进行了研究，重点分析涂层组织与耐冲蚀性能的关系. 结果表明，三种涂层的耐冲蚀性能均优于0Cr13Ni5Mo基材，冲蚀失重仅为基材的6% ~ 35%，组织越均匀、致密的涂层耐冲蚀性能越优. 低攻角冲击时，涂层冲蚀机制以粘结相去除，WC颗粒剥落为主，基材冲蚀机制主要为微切削；高攻角冲击时，涂层冲蚀机制以涂层剥落为主，基材的冲蚀机制主要为变形磨损. 涂层的组织决定了不同试验条件下涂层的冲蚀行为和冲蚀机制.
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关键词:
- 高速火焰热喷涂 /
- WC-10Co-4Cr涂层 /
- 耐冲蚀性能 /
- 冲蚀机制
Abstract: Three WC-10Co-4Cr coatings with different microstructure were prepared on 0Cr13Ni5Mo stainless steel by high velocity oxy-fuel/air-fuel (HVOF/AC-HVAF) thermal spray systems. The erosion behavior and mechanisms of three WC-10Co-4Cr coatings and 0Cr13Ni5Mo were investigated using slurry pot erosion equipment, and the relation between microstructure and erosion resistance of coatings was analyzed. The results indicated that the erosion resistance of three coatings was better than that of 0Cr13Ni5Mo. The erosion mass loss of three coatings was 6% ~ 35% of the 0Cr13Ni5Mo. The coatings with more homogeneous microstructure behaved better erosion resistance. For coatings, the dominant erosion mechanism was removal of binder and WC cuboids pull out at shallow impingement angle while coatings spallation mechanism dominated at high impingement angle. In contrast, micro-cutting mechanism dominated at shallow impingement angle while its dominant erosion mechanism was repeated deformation which resulted in the removal of materials at high impingement angle for 0Cr13Ni5Mo stainless steel. The erosion behavior and mechanisms of coatings at different test condition were dependent on their microstructure.-
Keywords:
- HVOF/AC-HVAF /
- WC-10Co-4Cr coatings /
- erosion resistance /
- erosion mechanism
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