含云母钛铝基自润滑合金的摩擦磨损性能  

Friction and Wear Properties of TiAl Based Self-Lubricating Alloy Containing Muscovite

作　　者：欧阳子路 章桥新[2] 余栋[2] 何鹏[3] 赵志高[3] 潘成刚[4] 

机构地区：[1]武汉理工大学交通学院,湖北武汉430063 [2]武汉理工大学机电工程学院,湖北武汉430070 [3]武汉第二船舶设计研究所,湖北武汉430205 [4]武汉科技大学耐火材料与冶金国家重点实验室,湖北武汉430081

出　　处：《材料保护》2017年第6期31-36,60,共7页Materials Protection

基　　金：国家自然科学基金(51375353)资助

摘　　要：为了提高Ti Al基合金的摩擦磨损性能,采用放电等离子烧结(SPS)技术制备含云母的Ti Al基合金(TAM);采用光学显微镜、扫描电镜、X射线衍射仪及能谱仪考察了试样的显微组织形貌及其物相结构与成分;采用维氏硬度计测试了试样的显微硬度;采用球盘式摩擦试验机测试了其室温和400℃下的摩擦磨损性能。结果显示:TAM主要含有γ-Al Ti、α2-Ti3Al和云母颗粒,且云母与基体呈现良好的界面结合;TAM的维氏硬度较之基材下降了约54 HV4.9 N;室温下TAM的摩擦系数由基材的0.57下降至0.44,体积磨损量下降幅度达62.5%;高温下TAM的摩擦系数最终与基材一致,表现出零磨损量的特征。云母在常温下发挥了自润滑、自修复功能,表现出良好的减摩抗磨特征;400℃下云母减摩特征被黏着磨损机制掩盖,但保留了自修复性能,展现出了良好的抗磨特性。TiAl based alloy containing mica （TAM） was fabricated by spark plasma sintering technology （SPS） for wear improvement,and the microstructure morphology and phase composition of sample were characterized by optical microscope,scanning electron microscope,X-ray diffractometer and energy disperse spectroscopy.The microhardness of sample was studied by Vickers hardness tester.Moreover,the friction and wear properties of sample under room temperature and 400 ℃ were evaluated by ball plate friction testing machine.Results showed that TAM was composed of γ-AlTi,αα2-Ti3 A1 and mica granules,and the interface combination of mica and substrate was well.Under room temperature,the friction factor of TAM decreased from 0.57 to 0.44（friction factor of substrate）,and the wear volume decreased by 62.5%.Under the high temperature,the friction factor of TAM finally presented similar to that of substrate,and no wear loss was observed.In general,the mica in the alloy played a role of self-lubricating and self-repairing,which exhibited excellent anti-wear characteristics.Under 400 ℃,the anti-wear characteristics of TAM were covered by adhesive wear mechanism,but the self-repairing property was retained,which endowed the TAM with good anti-wear property.

关 键 词：云母 钛铝基合金 摩擦磨损性能 自润滑 自修复 

分 类 号：TG146.23[一般工业技术—材料科学与工程]