C/SiC摩擦材料的制备及摩擦磨损性能

通过化学气相渗透法(CVI)结合反应熔体浸渗法(RMI)制备了低成本、高性能的C/SiC飞机摩擦材料, 并模拟飞机正常着陆条件进行了摩擦磨损实验. 实验结果表明: C/SiC是比C/C更优的飞机摩擦材料, 具有动、静摩擦系数高(分别为0.34、0.41), 湿态几乎无衰减(约2.9%), 磨损小(约1.9μm/次), 摩擦性能稳定等特点. 并采用金相显微镜、扫描电镜等对C/SiC摩擦材料的摩擦面以及磨屑形貌进行了观察, 并对其磨损机理进行了探索. 结果表明, 磨损机理以磨粒磨损为主, 同时由于垂直于摩擦面的纤维束增强了其层间抗剪切能力, 从而提高了其抗磨损性能.

Preparation and Tribological Properties of C/SiC Friction Materials

The cost effective and high performance carbon/silicon carbide aircraft friction materials were prepared by the combination of chemical vapor infiltration (CVI) and reactive melt infiltration (RMI). The tribological properties of the as-manufactured C/SiC composites were measured under the simulated conditions of normal landing of the aircraft. The test results indicate the more excellent tribological properties of C/SiC composites than that of C/C composites. The average coefficients of kinetic friction and static friction are about 0.34 and 0.41, respectively, the wet fading ratio is about 2.9%, the linear wear rate is less then 1.9μm·cycle-1, and the coefficient of friction is stable. The surface microstructure and wear debris on wear-induced surfaces of C/SiC disks were investigated by optical microscope and SEM. The results indicate that the main wear mechanism of the C/SiC composites is the grain-abrasion. The wear resistance is improved due to the enhanced in-plane shear strength derived from the fiber bundle vertical to the friction surface.