Ceramics and Composite Materials

Biography

Biography: QIN ZOU

Abstract

Ti3SiC2-Cu alloy matrix composite (T-Cu) of brake pad was fabricated through partly replacing flake graphite in graphite-Cu alloy matrix composite (G-Cu) of brake pad with Ti3SiC2 particle as antifriction component. Friction and wear properties of T-Cu and G-Cu composites were measured in order to investigate the effect of Ti3SiC2 and obtain the effect differences of Ti3SiC2 and flake graphite on them. Friction coefficients of G-Cu and T-Cu decreased as applied loads increased from 100 N to 400 N within 900 s. Friction coefficients of T-Cu were 1.5-2 times as those of G-Cu in the same conditions. Friction coefficients of T-Cu increased slightly with measured time increase, while the G-Cu’s was almost constant. T-Cu showed relatively stabler average friction coefficients than those of G-Cu from room temperature to 500℃ measured in the conditions of 200 N load, 1.2 m/s speed and within 900 s. Average wear rates of G-Cu and T-Cu decreased with applied load increase. Worn surfaces of T-Cu were smoother than those of G-Cu after being worn. Wear resistance of T-Cu was better than that of G-Cu. Ti3SiC2 had superior properties and distributed evenly in Cu alloy matrix. Interdiffusion of Ti3SiC2 and Cu alloy matrix enhanced their combination and prevented Ti3SiC2 fall off easily from Cu alloy matrix. Lubricant films were formed on T-Cu surfaces consisting of Ti and Si oxides, which effectively improved T-Cu oxidization resistance. Thus comprehensive properties of T-Cu were better than those of G-Cu.