Microstructure of C/SiC Braking Material

Carbon fiber reinforced silicon carbide matrix(C/SiC)braking materials were prepared by a reactive melt infiltration method.The microstructure characteristics of SiC were studied by means of optical microscope,scanning electron microscope and transmission electron microscope in combination with component analysis by X-ray diffraction.Results show thatβ-SiC zone usually forms inside the short-cut fabric,around the needling fibers,and among the fiber bundles in the non-woven web.Residual Si locates among SiC grains.In C/SiC composites,there exist two different areas of SiC,one is coarserβ-SiC grains between 5-15μm at the SiC-Si interface,and the other is a zone of a fine grainedβ-SiC layer with dimension of about 100nm at the SiC-C interface.