电火花沉积制备Fe-8B-Mo非晶涂层的可行性  

Feasibility on Preparation of Fe-8B-Mo Amorphous Coatings by Electro-spark Deposition

作　　者：魏祥[1] 陈志国[2,3] 钟掘 黄奇胜 张怡[2] 张雨龙[2] 

机构地区：[1]中南大学轻合金研究院,长沙410083 [2]中南大学材料科学与工程学院,长沙410083 [3]湖南人文科技学院材料工程系,湖南娄底417000

出　　处：《中国表面工程》2016年第5期16-23,共8页China Surface Engineering

基　　金：湖南省科技创新重点项目(湘发改投资[2014]658号)

摘　　要：为研究Fe-8B-Mo合金的非晶形成能力,采用电火花沉积工艺制备了4种Fe-8B-x Mo(x=13.62,23.62,33.62和43.62,w/%)合金涂层。通过X射线衍射仪(XRD)表征涂层的物相组成,探索获得非晶涂层的可行性,并采用扫描电镜(SEM)、显微硬度测试及摩擦磨损试验进一步研究所得涂层的微观组织与性能。结果表明:4种涂层都由非晶相、马氏体相和Fe2B相组成,其中,13.62%Mo涂层主要含Fe2B相和马氏体相,而23.62%Mo、33.62%Mo和43.62%Mo涂层主要含非晶相,且随着Mo含量的增加,涂层中非晶相含量逐渐减少。4种涂层的组织结构致密,缺陷少,与基体呈良好的冶金结合。23.62%Mo涂层具有最大的峰值显微硬度(1 138.1 HV0.05);同时,该涂层在摩擦磨损的稳定阶段具有最小的平均摩擦因数,且其2 h的磨损质量也最小,表现出更好的摩擦磨损性能。4种涂层的磨损机制均为磨粒磨损和疲劳磨损。To investigate the amorphous forming ability of the Fe-8B-Mo alloy, four types of the Fe-8B-Mo （x = 13.62, 23.62, 33.62 and 43.62, w/%） alloy coatings were successfully prepared by electro-spark deposition. Phase composition of the coatings was characterized by X-ray diffraction （XRD） for exploring the feasibility of forming amorphous coatings. Moreover, scanning electron microscope （SEM） observation, mircohardness test, friction and wear tes~ were conducted for further investigation of their microstructure and properties. XRD results show that four types of th,e Fe-8B-Mo coatings are all composed of amorphous phase, martensite phase and Fe2B phase. The 13.62% Mo coating consists mainly of Fe2B phase and martensite phase, whereas the others consist primarily of amorphous phase, furthermore, the amorphous phase decreases as the Mo increases. The coatings are dense, barely defective and metallurgically bonded with the substrate. The 23.62% Mo coating has a maximum peak microhardness of 1 138.1 HV0.05. It shows the minimum mean friction coefficient in the steady state and the minimum wear mass after abrasion of 2 h as evidence of its better friction and wear performance. The abrasion mechanism of four types of the Fe-8B-Mo coatings is both abrasive wear and fatigue wear.

关 键 词：电火花沉积 非晶涂层 显微组织 性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]