超音速火焰喷涂工艺对WC-CoCr涂层的力学性能影响研究  

Effect of Spraying Process on the Mechanical Property of HVOF Spraying WC-CoCr coating

作　　者：万伟伟[1,2] 卢晓亮[1] 高峰[1,2] 侯伟骜[1,2] 国俊丰[1,2] 崔崇[1] 

机构地区：[1]北京矿冶研究总院,北京100160 [2]北京市工业部件表面强化与修复工程技术研究中心,北京100026

出　　处：《热喷涂技术》2013年第3期49-51,67,共4页Thermal Spray Technology

基　　金：科技支撑计划2012BAE06B02

摘　　要：采用超音速火焰喷涂(HVOF)在调质45钢表面制备WC-CoCr涂层,调节不同喷涂工艺制备3种涂层。运用扫描电镜(SEM)、能谱分析(EDS)手段及LeiCa DMIMR图像分析系统对所制备涂层的组织形貌和成份进行表征与分析;并利用显微硬度仪对涂层的力学性能进行表征。结果表明:WC-CoCr涂层的孔隙率随着喷涂距离的增加而减小,进一步增加时涂层的孔隙率反而增大,涂层的显微硬度也随着喷涂距离的增加而减小,喷涂距离为370时其显微硬度达到最优,显微硬度值为1477.61HV0.3。通过以上工艺对比分析可知喷涂距离对涂层的性能影响较大。WC-CoCr coating was prepared on 45 steel by HVOF. The microstructure morphology and phase composition were analyzed by SEM, image analysis system and EDS; microhardness were analyzed by micro- penetration hardness. The results show that： The porosity of the WC-CoCr coatings decreases with the increase of the spraying distance, To fturther increase the porosity of coating increases, the microhardness of the coatings decreases with the increase of the spray distance, spraying distance was 370 and the hardness is optimal, micro hardness value is 1477.61HV0.3, Comparing the above spray process, the spraying distance effect on the properties of coating greatly.

关 键 词：超音速火焰喷涂 WC-CoCr涂层 喷涂工艺 涂层表征 

分 类 号：TG174.4[金属学及工艺—金属表面处理]