低温超音速火焰喷涂WC-10Co4Cr涂层的抗泥浆冲蚀性能  

Anti-slurry Erosion Performance of WC-10Co4Cr Coatings Sprayed by LT-HVOF

作　　者：陈文龙[1,2] 刘敏[2] 韩滔[3] 

机构地区：[1]广东工业大学材料与能源学院,广州510006 [2]广州有色金属研究院,广州510651 [3]中南大学材料科学与工程学院,长沙410083

出　　处：《有色金属工程》2016年第2期1-5,共5页Nonferrous Metals Engineering

基　　金：广东省科技计划项目(2011B010400040)

摘　　要：以5～20μm超细WC-10Co4Cr粉末为原料,采用低温超音速火焰喷涂技术（LT-HVOF）制备WC涂层。利用扫描电镜（SEM）和X射线衍射（XRD）表征和分析WC-10Co4Cr粉末及涂层的显微结构形貌与相结构。用冲刷磨损试验机测试涂层泥浆的冲蚀性能。结果表明,泥浆冲蚀攻角变化对涂层的冲蚀质量损失影响不明显。低攻角下涂层冲蚀机制以黏结相的微切削为主,剥落凹坑的面积大而浅,高攻角下涂层的主要冲蚀机制为裂纹萌生和扩展导致的涂层剥落,凹坑面积小而深。The WC-10Co4 Cr coatings are prepared by the flame spraying technology with low temperature and high velocity（ LT-HVOF） technology using 5 ～ 20 μm ultra-fine powders as raw material. The microstructural topography and phase structure of the WC-10Co4 Cr powers and the coatings are characterized and analyzed by SEM and X-ray diffraction, respectively. The slurry erosion performances of the WC-10Co4 Cr coatings are tested by Scouring Abrasion Tester. The results show that the erosion mass loss of the coating is scarcely influenced by the variation of impingement angle in the slurry erosion experience. The dominant erosion mechanism is the micro-cutting of cohere phase at the shallow impingement angle,and the crater is large and superficial. The dominant erosion mechanism is crack enlarge result in the detachment of the coatings at high impingement angle,and the crater is small and deep.

关 键 词：低温超音速火焰喷涂 WC-10Co4Cr 泥浆冲蚀性能 攻角 

分 类 号：TG174.5[金属学及工艺—金属表面处理]