Ti_3SiC_2增强铝基复合材料的摩擦磨损特性研究

Friction and wear characteristics of Ti_3SiC_2 reinforced aluminum matrix composite materials

通过机械合金化制备出了Ti3SiC2粉体,真空热处理对机械合金化粉体进行了提纯,采用脉冲放电等离子烧结(SPS)技术制备出了Ti3SiC2/Al复合材料,并对该复合材料进行了组织观察和摩擦磨损特性的表征。研究结果表明,采用机械合金化技术可以将Ti,Si和C单质粉体合成Ti3SiC2,机械合金化合成Ti3SiC2粉体中含有的TiC杂质相可通过真空热处理去除,当热处理温度为1 000℃时,可将Ti3SiC2的纯度提高至99.1%。在550℃时,采用SPS技术烧结的Ti3SiC2/Al复合材料组织均匀摩擦磨损特性优良,其中含5 vol%Ti3SiC2的复合材料摩擦系数较低且耐磨性较好。

Ti3SiC2 powders are prepared with mechanical alloying and then are purified with vacuum heat treatment.Ti3SiC2/Al composite materials are fabricated with pulse plasma sintering technology.XRD and SEM are used to analyze the structure and friction and wear characterization of the Ti3SiC2/Al composite materials.Results show that Ti3SiC2 powders can be fabricated by mechanically alloying Ti,Si and C element single powders,and TiC impurity phase in as-fabricated powders can be removed by vacuum heat treatment.The purity of the Ti3SiC2 powders can be increased up to 99.1% at the temperature 1 000 ℃.Friction and wear characteristics of Ti3SiC2/Al composite materials at 550 ℃ is good while the composite with 5 vol% Ti3SiC2/Al has better friction and wear resistance.