11:00 〜 11:20
[15F-T14-06] Fabrication of ZrB2-SiC and Its Related Composites by SPS and Their Oxidation Behavior
キーワード:spark plasma sintering, boride ceramics, silicon carbide, thermal protection system, oxidation
Zirconium diboride (ZrB2) is a leading candidate for thermal protection systems (TPS) for re-entry vehicles due to its high melting point, thermal shock resistance, and low density. ZrB2 does not fully possess oxidation resistance necessary for surviving the re-entry condition. It improves oxidation resistance when composited with silicon carbide (SiC) and can withstand the intense oxidation environment caused by aerodynamic heating during re-entry. In order to develop TPS, high-density ZrB2-SiC with different composition ratios were fabricated by spark plasma sintering (SPS). In addition, TPS with carbides and silicides added to ZrB2-SiC were also fabricated for enhanced sinterability and oxidation resistance. Static oxidation experiments in an oxidizing atmosphere were conducted to evaluate their oxidation resistance.