Friction and Wear Properties of Ti3SiC2-Ag Composite Sliding against Different Counterparts
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摘要: 采用放电等离子烧结技术制备了Ti3SiC2-Ag复合材料,研究了其在室温下与Si3N4、Al2O3、SiC等摩擦配副对摩时的摩擦磨损性能,并与纯Ti3SiC2材料在相同摩擦配副条件下的摩擦磨损性能进行了对比。运用扫描电子显微镜、X射线光电子能谱仪等对磨损表面的形貌组织和元素价态等进行了表征分析,并探讨了摩擦磨损机理。结果表明:摩擦配副材料的不同对Ti3SiC2-Ag复合材料的摩擦磨损行为有显著影响,Ti3SiC2-Ag复合材料与SiC和Si3N4对摩时,磨损率均较低,尽管存在晶粒拔出等机械磨损,但TiO2和SiOx等摩擦氧化膜的形成有效地抑制了晶粒拔出并起到了减摩作用;Ti3SiC2-Ag复合材料与Al2O3对摩时磨损率则较高,以脆性断裂、晶粒拔出为主的机械磨损是该摩擦副的主要磨损机制。Ti3SiC2材料与Si3N4和Al2O3对摩时,包含脆性断裂、晶粒拔出、脱落以及磨粒磨损在内的机械磨损是其主要的磨损机制;Ti3SiC2材料与SiC对摩时,磨损表面的塑性变形和氧化膜起到了抑制晶粒拔出的作用,使得Ti3SiC2的磨损率相对较低。
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关键词:
- Ti3SiC2-Ag复合材料 /
- 摩擦磨损性能 /
- 摩擦配副
Abstract: The Ti3SiC2-Ag composite was fabricated through spark plasma sintering technology. The friction and wear properties of Ti3SiC2-Ag composite sliding against different counterparts,including Si3N4,Al2O3 and SiC balls were investigated at ambient temperature and compared with that of pure Ti3SiC2under the same condition. The morphologies of worn surfaces were observed by scanning electron microscope,elemental valence states analyzed by X ray photoelectron spectroscopies and the friction and wear mechanisms were discussed. The results showed that the different counterparts have a significant impact on the friction and wear properties of Ti3SiC2-Ag composite. The Ti3SiC2-Ag composite showed lower wear rate sliding against Si3N4 and SiC balls for TiO 2and SiO xoxide films could inhibit grain pulling out and have antifriction effect,even though there is mechanical wear characterized by grain pulling out. The higher wear rate of Ti3SiC2-Ag composite sliding against Al2O3 balls is attributed to the predominant mechanical wear mechanism characterized by brittle fracture and grain pulling out. For the Ti3SiC2sliding against Si3N4 and Al2O3 balls,the friction and wear mechanism is mainly the mechanical wear involving brittle fracture,grain pulling out,falling off and bals abrasive wearing. The plastic deformation and oxide film make wear rate lower by inhibiting grain pulling out when Ti3SiC2sliding against SiC. -
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