Improved ablation resistance of C-C composites usingzirconium diboride and boron carbide

摘要

Zirconium diboride and boron carbide particles were used to improve the ablation resistance of carbon-carbon (C-C) composites at high temperature(1500℃). Our approach combines using a precursor to ZrB 2 and processing them with B 4C particles as filler material within the C- C composite.An oxyacetylene torch test facility was used to determine ablation rates for carbon black, B_4C, and ZrB_2- B_4C filled C-C composites from 800 to1500. Ablation rates decreased by 30% when C-C composites were filled with a combination of ZrB_2- B_4C particles over carbon black and B4Cfilled C-C composites. We also investigated using a sol-gel precursor method as an alternative processing route to incorporate ZrB_2 particles withinC-C composites. We successfully converted ZrB_2 particles within C-C composites at relatively low temperatures (1200℃). Our ablation results suggest that a combination of ZrB_2-B_4C particles is effective in inhibiting the oxidation of C- C composites at temperatures greater than 1500 .