以针刺炭纤维整体毡为预制体, 联用化学气相沉积法与熔融渗硅法制得炭纤维增强C/SiC双基体(C/C-SiC)复合材料; 研究了C/C-Si材料的显微结构、力学性能和不同制动速度下的摩擦磨损性能及机理.结果表明: C/C-SiC材料具有适中的纤维/基体界面结合强度, 弯曲强度和压缩强度分别达240MPa和210MPa, 具有摩擦系数高(0.41～0.54), 磨损小(0.02cm3/MJ), 摩擦性能稳定等特点. 随着制动速度提高, C/C-Si材料的摩擦磨损机制也随之变化: 在低速制动条件下主要表现为磨粒磨损; 中速时以黏着磨损为主; 高速时以疲劳磨损和氧化磨损为主.
Carbon fibre-reinforced carbon and silicon carbide dual matrix composites (C/C-SiC) were fabricated by a combination of chemical vapor infiltration with liquid silicon infiltration. The structural characteristics, mechanical performance and tribological properties of the C/C-SiC composites and their wear mechanism at different braking speeds were investigated using a QDM150 friction testing machine, SEM and X-ray energy dispersive analysis. Results indicate that the C/C-SiC composites show an increased bonding strength at the fibre/matrix interface, and the value of flexural strength and compressive strength of the C/C-SiC composites can reach 240 and 210 MPa, respectively. The friction coefficients are between 0.41 and 0.54. Wear rates are not sensitive to the brake speed and remain constant at about 0.02 cm3/MJ, and the friction coefficient is stable. Frictional films with a thickness of 1-3μm are formed on the worn surface of the composites upon braking. The wear mechanism changes with increased braking speed, from abrasion at 8m/s, adhesion at 12 m/s and 16 m/s to fatigue and oxidation at 20 m/s and 24 m/s, respectively.
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