Friction And Wear Behaviors Of Ti₃SiC₂ Ceramic Materials

In order to apply the conductive Ti₃SiC₂-class ceramics to fabricate the pantograph strip of high-speed train, the friction and wear behaviours as well as the relevant mechanisms of a Ti₃SiC₂ material were investigated. The work of this thesis mainly involved that: â‘  preparing a high-pure polycrystalline bulk Ti₃SiC₂ sample; â‘¡ testing the friction and wear behaviors of the Ti₃SiC₂ dryly sliding against a low carbon steel disk by a high-speed friction and wear tester, discussing effects of the normal pressure, the sliding speed and the impurities in Ti₃SiC₂ sample on friction coefficient, and discussing the mechanism of the oxide film forming over the friction surface of Ti₃SiC₂; â‘¢ discussing effects of the normal pressure, the sliding speed and the impurities on the wear rate of Ti₃SiC₂, and antifriction actions of the oxide film; â‘£ measuring the performances including the relative intensity, the Vickers' hardness, the flexural strength and the room temperature resistivity.The results showed that the prepared highly-pure and highly-dense Ti₃SiC₂ samples have a good electrical conductors, a relatively low Vickers' hardness, and excellent mechanical properties; The friction coefficient and the wear rate of the highly pure Ti₃SiC₂ material against low carbon steel markedly depends on the sliding speed. In the range of the sliding speed less than 60m/s, the friction coefficient decreases with increase in the speed, while the wear rate of Ti₃SiC₂ increases with increase in the sliding speed. In addition, the normal pressure has also a certain influence. The reason induced the decrease of friction coefficient...