Friction and Wear Performance of Carbon Ceramic Composite

Carbon ceramic composite for aircraft brake block with density of 2.0-2.2 g·cm^-3 was prepared on the basis of carbon carbon body by liquid phase siliconizing method. The phase composition, microstructure and mechanical properties of the material were studied. By simulating different braking conditions of aircraft, the dry and wet friction and wear performance of the material friction pair under 1.4 MJ load was studied by a large sample test bench. The results show that the material was composed of carbon phase, β-SiC phase and silicon phase, and SiC phase mainly distributed between carben fiber bundles and the mesh layer composed of chopped carbon fibers. The material had vertical and parallel bending strength of 132.7, 135.5 MPa, respectively and interlaminar shear strength of 12.2 MPa. Under the braking pressure of 0.2-0.5 MPa and the braking speed of 5-27 m·s^-1, with increasing the braking speed, the dry dynamic friction coefficient of the material increased first and then decreased in the range of 0.30-0.65, and was negatively correlated with the braking pressure. Under the braking pressure of 0.5 MPa, when the braking speed increased from 25 m·s^-1 to 27 m·s^-1, the attenuation rate of wet dynamic friction coefficient was less than 10%. Under the braking pressure of 0.55 MPa and the braking speed of 25 m·s^-1, the average linear wear rate of each surface per time was 0.001 2-0.001 3 mm, and the overall wear rate was small and relatively stable.