Dry Friction and Wear Properties of Ti_3SiC_2 Ceramic under Different Pressure

Ti3SiC2 ceramic is prepared with reaction-sintering,whose dry friction and wear behaviours are investigated by a ring-disk tribology tester.Low carbon steel is chosen as the counterpart.The test is conducted at room temperature and relative humidity of 23%~25%,the sliding speed and the normal pressure are taken as 0.5 m/s and 20~60 N for 0.5 h.The results show that the coefficient of friction and wear ratio of Ti3SiC2 increase first and then decrease with the increasing normal pressure.The peak values of coefficient of friction and wear ratio appear when the normal pressure gets 30 N and 40 N,respectively.The effect of normal pressure on the wear behaviours of Ti3SiC2 is analyzed by scanning device.When the pressure is low,the main wear mechanisms are found to be slight abrasive wear caused by the desquamating of Ti3SiC2 particles and rheologic behavior of worn surface;when the pressure is higher than 40 N,the main wear mechanisms are found to be slight scratch and light adhesive wear of the oxidation film.