论文部分内容阅读
实验研究了燃气流量、氧气流量和喷涂距离对超音速火焰 (HVOF)喷涂Cr3C2 NiCr涂层冲蚀磨损性能的影响 ,在对不同角度冲蚀后涂层表面和横截面结构分析的基础上 ,探讨了其冲蚀磨损失效机制 .结果表明 :Cr3C2 NiCr涂层的冲蚀磨损呈现脆性材料的冲蚀磨损特征 ,在 90°冲蚀率最大 ;磨料冲击引起的裂纹沿涂层内粒子界面萌生、扩展并最终导致粒子剥落 ,是涂层主要的冲蚀磨损机制 .
The effects of gas flow rate, oxygen flow rate and spray distance on the erosion and wear properties of HVOF sprayed Cr3C2 NiCr coatings were investigated experimentally. Based on the analysis of the coating surface and cross-sectional structure after erosion at different angles, The results show that the erosive wear of Cr3C2 NiCr coating shows the characteristics of erosion and wear of brittle materials, and the erosion rate is the largest at 90 °. The cracks caused by abrasive impact initiate and spread along the particle interface within the coating And eventually lead to particle spalling, the main erosive wear mechanism of the coating.