航空刹车副用炭/炭复合材料渗硅增摩改性研究

Increasing friction and modifying properties for the C/C composites of airced brake pairs by infiltrating Si

对A,B2种试样作了渗硅处理.在A样的摩擦磨损试验中,其线性磨损由原来的42μm/次降低到17.56μm/次,摩擦因数较稳定,均为0.36,并且摩擦磨损曲线的线型较好.B样渗硅后也比渗硅前的摩擦磨损曲线线型好,同时解决了摩擦时的振动问题,但随试样中所生成SiC含量的增加,其摩擦因数逐渐降低(由0.40→0.34→0.30),线性磨损量增大(由(2.0/1.4)μm→(21.21/23.12)μm→(69.33/52.85)μm).同时分析了摩擦磨损的机理,认为其摩擦磨损性能一方面受A,B 2种试样的结构性能影响;另一方面也取决于渗硅后所生成SiC的性能及结构.

The friction behaviors of samples A and B were studied by infiltrating Si. For sample A, the linearwear reduced from 42 μm to 17. 56 μm each process; the curve improved and the friction coefficient wasstable at 0. 36. Sample B also had good curve except that the friction coefficient reduced from 0. 40 to 0.30, the linear wear of stator increased from 2. 0 μm to 69. 33 μm, and that of rotor increased from 1. 4μm to 52. 85 μm eveny time with the increasing of SiC in sample B. The result was analyzed by the theoryof friction-wear. The experimental results were not only effected by the microstructures of samples A andB, but also by SiC produced in the sample and its microstructure.