TY - JOUR
T1 - Ablation behavior of C/C–Zr1-xHfxC-SiC composites under an oxyacetylene flame at above 2500 °C
AU - Jiao, Xiaoyang
AU - He, Qinchuan
AU - Qing, Mingcong
AU - Wang, Yiqun
AU - Yin, Xuemin
N1 - Publisher Copyright:
© 2023 The Authors
PY - 2023/5/1
Y1 - 2023/5/1
N2 - In order to enhance ablation resistance of C/C composites, Zr1-xHfxC and SiC were introduced into C/C composites, and ablation behavior of the composites was studied. In the composites (CHZS), HfC and ZrC produced a solid solution, and solid solubility of HfC in ZrC was 0.4, which indicated that the solid solution was defined to be Zr0.6Hf0.4C. Compared with C/C–ZrC–SiC composites (CZS), CHZS possessed a better ablation resistance. During ablation of CHZS, Zr0.6Hf0.4C is oxidized to produce HfO2 and ZrO2, and HfO2 particles played a pinning effect, which fixed molten oxide coating. Moreover, due to low CTE of HfO2 and decreasing content of ZrO2, there was a smaller thermal stress and its distribution area on CHZS ablation surface, thus thermal stress corrosion was weakened to strengthen integrity of oxide coating. In this case, a complete and continuous HfO2-ZrO2 coating was formed on CHZS surface, which could resist oxygen diffusion and reduce oxidation rate of the composites.
AB - In order to enhance ablation resistance of C/C composites, Zr1-xHfxC and SiC were introduced into C/C composites, and ablation behavior of the composites was studied. In the composites (CHZS), HfC and ZrC produced a solid solution, and solid solubility of HfC in ZrC was 0.4, which indicated that the solid solution was defined to be Zr0.6Hf0.4C. Compared with C/C–ZrC–SiC composites (CZS), CHZS possessed a better ablation resistance. During ablation of CHZS, Zr0.6Hf0.4C is oxidized to produce HfO2 and ZrO2, and HfO2 particles played a pinning effect, which fixed molten oxide coating. Moreover, due to low CTE of HfO2 and decreasing content of ZrO2, there was a smaller thermal stress and its distribution area on CHZS ablation surface, thus thermal stress corrosion was weakened to strengthen integrity of oxide coating. In this case, a complete and continuous HfO2-ZrO2 coating was formed on CHZS surface, which could resist oxygen diffusion and reduce oxidation rate of the composites.
KW - Ablation behavior
KW - C/C composites
KW - Composition
KW - Microstructure
KW - ZrHfC solid solution
UR - http://www.scopus.com/inward/record.url?scp=85152101769&partnerID=8YFLogxK
U2 - 10.1016/j.jmrt.2023.03.208
DO - 10.1016/j.jmrt.2023.03.208
M3 - 文章
AN - SCOPUS:85152101769
SN - 2238-7854
VL - 24
SP - 3235
EP - 3251
JO - Journal of Materials Research and Technology
JF - Journal of Materials Research and Technology
ER -