WC-Co-Cr涂层的孔率和层状结构对冲蚀行为的影响  

Effect of Porosity and Laminar Structure on Erosion Resistance of WC-Co-Cr Coatings

作　　者：李阳[1] 李曙[1] 刘阳[1] 王华仁 

机构地区：[1]中国科学院金属研究所,辽宁沈阳110016 [2]东方电机股份有限公司,四川德阳618000

出　　处：《摩擦学学报》2011年第3期228-234,共7页Tribology

摘　　要：采用3种高速火焰热喷涂设备将6种商业粉末喷涂在0Cr13Ni5Mo不锈钢基材上,制成结构不同的WC-Co-Cr涂层.用自行研制的料浆罐冲蚀试验机对9种涂层和基材的冲蚀行为进行研究,重点分析气孔率和层状结构对涂层耐冲蚀性能的影响.结果表明:气孔率和层状结构均降低了涂层的耐冲蚀性能,低速低料浆浓度时,气孔率对涂层耐冲蚀能力的影响较层状结构严重,气孔率高的涂层耐冲蚀性能甚至不如基材;高速和高料浆浓度时,层状结构明显的涂层耐冲蚀性能更差.本文探讨了利用单摆冲击划痕法测定涂层比能耗来定量表征层状结构的有效性,讨论了利用涂层气孔率和比能耗的测量结果推测其耐冲蚀性能的可能性.Three different HVOF/HVAF spray devices and six kinds of commercial powders were used to prepare specimens of WC-Co-Cr coatings with different microstructure on 0Cr13Ni5Mo stainless steel substrate.Their erosion behaviors were investigated on a self-manufactured slurry pot erosion tester.The effects of porosity and laminar structure on erosion resistance of coatings were researched.The result shows that the poor erosion resistance was due to their porosity and laminar structure.In low velocity and concentration slurry,the effect of porosity on erosion resistance of coatings was more pronouced than that of laminar structure.The erosion resistance of high porosity coatings was even worse than that of substrate.In high velocity and concentration slurry,the coatings with laminar structure showed the worst erosion resistance.The validity of characterization about laminar structure of coating by specific energy consumption（SEC） in single pendulum impact scratch testing was explored.Moreover,the possibility of deduction about the erosive resistance from the porosity and SEC of coating was discussed.

关 键 词：高速火焰热喷涂 WC-Co-Cr涂层 气孔率 层状结构 

分 类 号：TH117.1[机械工程—机械设计及理论]