ISSN   1004-0595

CN  62-1224/O4

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反应烧结Ti3SiC2/TiC复合材料摩擦磨损性能研究

Friction and Wear Characteristics of Ti3SiC2/TiC Composites by Reactive Sintering

  • 摘要: 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1 550℃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-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.

     

    Abstract: Ti3SiC2/TiC composite material was prepared by reactive sintering technology, the phase composition of Ti3SiC2/TiC composite material was examined using XRD-7000 X-ray diffraction, the bending strength, SEM photograph, friction and wear properties of Ti3SiC2/TiC were investigated using an INSTRON-1195 electronic universal testingmachine, JSM-6700F SEM and a HST-100 pin-on-disc friction and wear testing machine, respectively.The results showed that uniform and dense Ti3SiC2/TiC bulks can be synthesized by reactive sintering of starting composition of 3Ti/1.2Si/2C at 1 550℃.The flexural strength increased with the content increase of TiC. When the amount of TiC was higher than 18%, the flexural strength increased obviously while the frictional coefficient was tending towards stability and wear rate decreased obviously. Current intensity is the main influence factors, friction coefficient and wear rate increased obviously with the current intensity enhanced, oxide scales (Non-current-carrying: SiO2, TiO2 and FeTiO3, Current-carrying: FeTiO3 and Fe2.35Ti0.65O4)will be formed on the surface, the main wear forms of Ti3SiC2/TiC were arc erosion and oxidation wear under the current-carrying conditions.

     

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