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采用无压反应烧结技术制备Ti3SiC2/TiC复合材料,利用XRD-7000型衍射仪、INSTRON-1195型电子万能试验机、JSM-6700F型扫描电子显微镜、HST-100型摩擦磨损试验机对Ti3SiC2/TiC复合材料烧结试样的相组成、抗弯强度、断口显微形貌和载流摩擦磨损性能进行了研究.结果表明:在1550℃下可制备得到均匀致密的Ti3SiC2/TiC复合材料;随着试样中TiC含量的增加,复合材料抗弯强度逐渐增大;当TiC质量分数达到18%左右时,抗弯强度明显增加,摩擦系数趋于稳定,磨损率快速下降;电流强度是Ti3SiC2/TiC复合材料摩擦磨损性能的主要影响因素,随着试验电流强度的增强,摩擦系数和磨损率明显增大;同时在摩擦表面生成一层熔融状氧化膜(非载流:SiO2、TiO2和FeTiO3载流:FeTiO3和Fe2.35Ti0.65O4),主要磨损形式为电弧烧蚀和氧化磨损.
Ti3SiC2 / TiC composites were prepared by pressureless reaction sintering technique. The microstructures of Ti3SiC2 / TiC composites were characterized by XRD-7000 diffractometer, INSTRON-1195 electronic universal testing machine, JSM-6700F scanning electron microscope and HST-100 friction and wear tester. The phase composition, flexural strength, fracture microstructure and current-carrying friction and wear properties of the sintered samples were studied.The results show that uniform and compact Ti3SiC2 / TiC composites can be prepared at 1550 ℃, When the content of TiC reaches about 18%, the flexural strength increases obviously, the friction coefficient tends to be stable and the wear rate decreases rapidly. The current density is Ti3SiC2 / TiC composite With the increase of test current intensity, the friction coefficient and wear rate obviously increase. At the same time, a layer of molten oxide film is formed on the friction surface (non-current carrying: SiO2, TiO2 and FeTiO3 current carrying: FeTiO3 and Fe2.35Ti0.65O4), the main forms of wear arc erosion and oxidation wear.