Study on the high performance impregnating pitch used in C/C composite

According to the character of primary QI impurities composed of carbonaceous particles with the size of several micrometers, the coal tar was purified by the solvent flocculation method. Using the purified tar as raw material, the high performance impregnating pitch with low QI content was prepared. The rheologic behavior and the permeability of the high performance impregnating pitch were comparatively studied. It has been confirmed that the high performance impregnating pitch modifies greatly the impregnation efficiency. The mechanical characteristics of the C/C composite have been evidently improved.