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Synthesized ceramic precursor of silicon-containing polyborazine (SPBZ) was introduced to fabricate the modified phenolic resins (SPBZ-PR), which was then performed as resin matrix to obtain carbon fibers reinforced SPBZ-PR (CF/SPBZ-PR) laminated composites via hot-compression. The incorporation of SPBZ could improve the thermal stabilities of PR, and the optimal decomposition temperature at 5% weight loss (T 5) of the SPBZ 15-PR (15 wt% of phenol to SPBZ) was increased to 406.8 o C and the char yield at 1200 o C still retained 70.3%, owing to borazine ring and formed SiO x structure during pyrolysis process. Furthermore, the CF/SPBZ 15-PR laminated composites presented relatively higher ILSS, more excellent ablation properties and shape retention abilities than that of CF/PR laminated composites. The corresponding linear and mass ablation rate were both decreased from 0.013 mm/s and 0.033 g/s for CF/PR laminated composites to 0.0079 mm/s and 0.025 g/s, decreased by 39.2% and 24.2%, respectively.

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