电刷镀Ni-Co-W/Y_2O_3复合镀层的组织与摩擦磨损特性  

Microstructure and Friction-Wear Characteristics of Electro-Brush Plating Ni-Co-W Based Y_2O_3 Composite Coating

作　　者：袁庆龙[1] 凌文丹[1] 李平[1] 

机构地区：[1]河南理工大学材料科学与工程学院,河南焦作454003

出　　处：《稀有金属》2012年第4期557-562,共6页Chinese Journal of Rare Metals

基　　金：河南省科技计划项目(102102210210);河南理工大学傅恒志院士科研基金项目(506109)

摘　　要：采用复合电刷镀工艺在45钢基材上制备了含微米Y2O3颗粒的Ni-Co-W基复合刷镀层,采用扫描电镜、X射线衍射仪、显微硬度计、摩擦磨损试验机等对镀层的表面形貌、截面组织、结构、硬度及耐磨性进行了测定,与Ni-Co-W镀层进行了对比分析。结果表明:Ni-Co-W/Y2O3复合镀层厚度均匀,与基体之间呈凸凹镶嵌,结合紧密;与Ni-Co-W合金镀层相比,Ni-Co-W/Y2O3复合镀层的表面更加平整、光滑,组织更为致密,微裂纹明显减少;硬度较Ni-Co-W合金镀层更高,摩擦系数较低,Y2O3颗粒在镀层与摩擦副相互作用的过程中起支撑作用,减弱了磨损面的犁削效应和黏结效应,耐磨性显著优于Ni-Co-W合金镀层。XRD分析结果表明:此两种镀层均存在非晶态结构,微米Y2O3颗粒的加入促进镀层结构由非晶态向微晶态转变。Ni-Co-W based composite coating containing micron-Y2O3 particles were prepared by electro-brush plating on 45 steel substrate. The surface morphology, section structure, phase structure, hardness and wear resistance of coatings were determined and comparatively analyzed with scanning electron microscope, X-ray diffraction, micro-hardness tester and friction-wear tester. The results showed that Ni-Co-W/Y2O3 composite coating presented uniform thickness, and compact combination was formed with concave convex inlaying between the Ni-Co-W/Y203 composite coating and substrate. Compared with Ni-Co-W alloy coating, the surface morphology ot Ni-Co-W/Y2O3 composite coating was more leveling and smooth, the microstructure was more compact, microcrack decreased significantly, the micro-hardness was higher, and friction coefficient was lower than that of Ni-Co-W alloy coating. Y2O3particles had the ability to maintain interaction of coating and friction pairs, which weakened the effects of plough wear and adhesion wear, and the were resistance of Ni-Co-W/Y2O3composite coating was much better than that of Ni-Co-W alloy coating. The XRD analysis showed that the structure of these two kinds of coating both existed amorphous state, and the structure of coatings changed from amorphous to crystalline state due to the addition of micron-Y203 particles.

关 键 词：复合镀层 表面形貌 显微硬度 耐磨性 

分 类 号：TQ153[化学工程—电化学工业]