Research on catalytic graphitization progress of C/C-SiC composites by compression moulding

Compression moulding of short carbon fiber and resin,liquid resin impregnation and pyrolysis was included in C/C-SiC composites fabrication.Firstly,the analysis on graphitization shows carbon-silicon reaction enhanced Si activation to B and its graphitization rises from 87.9% to 97.3%.Investigation of morphologies and gradients shows graphitization occurred with carbon-silicon reaction.SiC shows uniform distribution inside materials.Secondly,boron-catalytic graphitization is discussed.With mass fractions of boracic formaldehyde-phenol resin,decreased from 69.9% to 46.3%,the graphitization degrees reduce from 91.6% to 70.4%.Finally,catalytic graphitization mechanism of Si is put forward.As contents of Si rises from 0 to 6.3%,graphitization degree of composites rises from 78.1% to 90.7%.