WC颗粒尺寸对WC-CoCr涂层组织与性能的影响  

Effect of WC Particle Size on Microstructure and Properties of WC-CoCr Coating

作　　者：杨二娟[1] 李太江[1] 李巍[1] 李勇[1] 刘刚[1] 米紫昊[1] 

机构地区：[1]西安热工研究院有限公司,西安710054

出　　处：《中国表面工程》2015年第4期70-76,共7页China Surface Engineering

基　　金：中国华能集团科技项目(HNKJ12-H34)

摘　　要：喷涂粉末颗粒尺寸是影响碳化钨涂层性能的关键因素。采用HVOF工艺制备3种不同WC颗粒尺寸的WC-CoCr涂层,利用扫描电镜、X射线衍射仪、显微硬度计和颗粒冲蚀磨损试验机等对涂层的组织结构及性能进行分析,系统研究了WC颗粒尺寸对涂层组织及性能的影响。结果表明:FN-WC涂层中碳化钨分解严重,PN-WC及M-WC涂层中碳化钨颗粒少量分解。FN-WC、PN-WC及M-WC涂层孔隙率分别为2.1%、2.0%和2.3%,硬度分别为1 254、1 241和1 229HV0.3,结合强度分别为68.7、73.5和72.9 MPa。15°攻角下FN-WC、PN-WC及M-WC涂层的抗冲蚀磨损阻力Re分别为9.3×104、15.5×104和10.74×104 g/cm3,90°攻角下的抗冲蚀磨损阻力Re分别为4.68×104、4.70×104和4.26×104 g/cm3。PN-WC涂层组织更均匀,WC相分解轻微,涂层硬度分布更集中,结合强度最高,在15°攻角下表现出最好的耐冲蚀性,综合性能优异。Particle size of spraying powder is the key factor which affets the properties of tungsten carbide coating. Three types of WC-CoCr coatings with different WC particle size were sprayed by high velocity oxy-fuel （HVOF）. The microstructure and properties were analyzed by SEM, XRD, micro-hardness tester, particle erosion abrasion tester and so on. The results show that the decomposition of WC is serious in the FN-WC coating, while little decomposition of WC is observed in the PN-WC coating and M-WC coating. The porosity of FN-WC coating, PN-WC coating and M- WC coating are 2.1~/00, 2.0% and 2.3% ,respectivly. The micro hardness are 1 254, 1 241 and 1 229 HV0.3 for the three kind of coatings. The bonding strength of FN-WC coating, PN-WC coating and M-WC coating are 68.7, 73.5 and 72.9 MPa. The erosion wear resistance of the FN-WC coating, PN-WC coating and M-WC coating under attack an an-gle of 15° are 9.3×10^4 , 15.5×10^4 and 10.74×10^4g/cm^3 , while the erosion wear resistance are 4.68×10^4 , 4.70×10^4 and 4.26×10^4 g/cm^3 under an attack angle of 90°. Compared with FN-WC coating and M-WC coating, the PN-WC coating shows uniform microstructure, slight decomposition of WC, concentrated distribution of hardness value, high bonding strength and good erosion wear resistance under an attack angle of 15°and thus an excellent comprehensive per-formance.

关 键 词：超音速火焰喷涂(HVOF) WC-CoCr涂层 冲蚀磨损 

分 类 号：TG174.442[金属学及工艺—金属表面处理]