TY - JOUR
T1 - Insights into high entropy ceramics under extreme conditions
T2 - Ablation behavior and microstructure evolution of C/C-(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C composites
AU - Zhao, Junhao
AU - Fu, Yanqin
AU - Lv, Junshuai
AU - Li, Jiachen
AU - Chen, Hui
AU - Cao, Yi
AU - Li, Xue
AU - Li, Wei
AU - Ding, Jinxue
AU - Zhang, Yulei
N1 - Publisher Copyright:
© 2025 Elsevier Ltd
PY - 2025/12
Y1 - 2025/12
N2 - High entropy ceramics (HECs) exhibit superior oxidation/ablation properties than traditional ceramics, particularly forming a low melting point phase with self-healing effect during the ablation process. Herein, C/C-(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C composites were fabricated by the combination of polymer infiltration pyrolysis (PIP) and chemical vapor infiltration (CVI). Oxyacetylene ablation behavior of C/C-(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C composites was studied systematically under a heat flux of 2.4 MW/m2, resulting in mass and linear recession rates of 0.58 mg/s and 5.13 µm/s, respectively. Due to the unique preferential behavior of multi-components, a dense transition layer containing (Hf, Zr)TiO4 and (Nb, Ta, Ti)C was formed between the oxide layer and the matrix, which alleviated the thermal expansion coefficient mismatch between the oxide layer and the matrix, protecting the internal matrix at ultra-high temperatures. Our work investigated the ablation protection behavior and mechanism of C/C-(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C and broadened the application of HECs in the field of ultra-high temperature ablation resistance for carbon-based composites.
AB - High entropy ceramics (HECs) exhibit superior oxidation/ablation properties than traditional ceramics, particularly forming a low melting point phase with self-healing effect during the ablation process. Herein, C/C-(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C composites were fabricated by the combination of polymer infiltration pyrolysis (PIP) and chemical vapor infiltration (CVI). Oxyacetylene ablation behavior of C/C-(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C composites was studied systematically under a heat flux of 2.4 MW/m2, resulting in mass and linear recession rates of 0.58 mg/s and 5.13 µm/s, respectively. Due to the unique preferential behavior of multi-components, a dense transition layer containing (Hf, Zr)TiO4 and (Nb, Ta, Ti)C was formed between the oxide layer and the matrix, which alleviated the thermal expansion coefficient mismatch between the oxide layer and the matrix, protecting the internal matrix at ultra-high temperatures. Our work investigated the ablation protection behavior and mechanism of C/C-(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C and broadened the application of HECs in the field of ultra-high temperature ablation resistance for carbon-based composites.
KW - Ablation behavior
KW - C/C composites
KW - High-entropy carbides
KW - Polymer infiltration pyrolysis
UR - https://www.scopus.com/pages/publications/105007906843
U2 - 10.1016/j.jeurceramsoc.2025.117616
DO - 10.1016/j.jeurceramsoc.2025.117616
M3 - 文章
AN - SCOPUS:105007906843
SN - 0955-2219
VL - 45
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 15
M1 - 117616
ER -