TY - JOUR
T1 - Microstructure and flexural strength of C/HfC-ZrC-SiC composites prepared by reactive melt infiltration method
AU - Kou, Sijie
AU - Ma, Jingchao
AU - Ma, Yujie
AU - Liu, Yinghao
AU - Luan, Chenghua
AU - Yang, Shaobo
AU - Fan, Shangwu
AU - Deng, Juanli
AU - Wang, Peng
N1 - Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2023/5
Y1 - 2023/5
N2 - C/HfC-ZrC-SiC composites were fabricated via reactive melt infiltration (RMI) of the mixed HfSi2 and ZrSi2 alloys. The microstructure, infiltration behavior of the hybrid silicide alloys infiltrating C/C composites, and flexural strength of C/HfC-ZrC-SiC composites was studied. Inside composites, there were more Hf-rich (Hf, Zr)C phases distributed in the exterior region, while more SiC and Zr-rich (Zr, Hf)Si2 in the interior region. There was compositional segregation in (Hf, Zr)C, with the HfC content decreasing from the exterior region to interior region. The RMI process was performed at different temperatures to investigate the structural evolution, and a model for the reactive melt infiltration of the mixed HfSi2 and ZrSi2 alloys into C/C composites was established. Compared with C/HfC-SiC and C/ZrC-SiC prepared by same process, C/HfC-ZrC-SiC had the highest flexural strength of 247Mpa and 213Mpa after oxidation at 1200 ℃ for 15 min. Both the unoxidized and oxidized samples presented a pseudo-plastic fracture behavior.
AB - C/HfC-ZrC-SiC composites were fabricated via reactive melt infiltration (RMI) of the mixed HfSi2 and ZrSi2 alloys. The microstructure, infiltration behavior of the hybrid silicide alloys infiltrating C/C composites, and flexural strength of C/HfC-ZrC-SiC composites was studied. Inside composites, there were more Hf-rich (Hf, Zr)C phases distributed in the exterior region, while more SiC and Zr-rich (Zr, Hf)Si2 in the interior region. There was compositional segregation in (Hf, Zr)C, with the HfC content decreasing from the exterior region to interior region. The RMI process was performed at different temperatures to investigate the structural evolution, and a model for the reactive melt infiltration of the mixed HfSi2 and ZrSi2 alloys into C/C composites was established. Compared with C/HfC-SiC and C/ZrC-SiC prepared by same process, C/HfC-ZrC-SiC had the highest flexural strength of 247Mpa and 213Mpa after oxidation at 1200 ℃ for 15 min. Both the unoxidized and oxidized samples presented a pseudo-plastic fracture behavior.
KW - Ceramic-matrix composites (CMCs)
KW - Flexural strength
KW - Microstructure
KW - Reactive melt infiltration (RMI)
KW - UHTCs
UR - http://www.scopus.com/inward/record.url?scp=85146417577&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2022.12.015
DO - 10.1016/j.jeurceramsoc.2022.12.015
M3 - 文章
AN - SCOPUS:85146417577
SN - 0955-2219
VL - 43
SP - 1864
EP - 1873
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 5
ER -