EFFECT OF PYROCARBON COATINGS OF THIN-WALLED CARBON-CARBON COMPOSITES ON THEIR SILICONIZING DEGREE

The results of studies on vapor-phase siliconizing of thin plates of carbon-silicon carbide materials (CSCM) of 2D+1 structure having pyrocarbon coating of various thickness was described. The increase in CSCM density and pyrocarbon coating thickness leads to the decrease in silicon content. Silicon content in C/C-SiC CM not exceed 13 mass %, if pyrocarbon coating thickness and CSCM density is more than 2 mu m and 1.53 g/cm(3), respectively. Close tensile and bending strength values of initial CSCM and obtained CSCM is evident of keeping the carbon fibers skeleton after siliconizing.