TY - JOUR
T1 - Influence of curing atmosphere on the pyrolysis mechanism of (Hf1/2Zr1/3Ti1/6)C precursor
AU - Yan, Shengman
AU - Song, Xin
AU - Yan, Han
AU - Ye, Li
AU - Han, Weijian
AU - Cui, Haifeng
AU - Li, Cheng
AU - Zhao, Tong
AU - Qiu, Wenfeng
AU - Zhang, Zhongwei
N1 - Publisher Copyright:
© 2025 The American Ceramic Society.
PY - 2025
Y1 - 2025
N2 - This work systematically investigated the effects of curing atmospheres (air vs. nitrogen) on the pyrolysis mechanism of (Hf1/2Zr1/3Ti1/6)C (HZT) liquid precursor. The results indicated that curing in an air atmosphere led to the formation of HfO2 nanocrystals in the curing products. These nanocrystals served as nucleation sites during the following polymer-to-ceramic process, facilitating the generation of numerous small-sized oxide nanocrystals, which exhibited high reactivity and promoted the carbothermal reduction reaction. Detailed analysis of the Cued-Air samples demonstrated a complex phase evolution: (1) formation of HfO2, ZrO2, and TiO2 nanocrystals at 600°C, (2) solid-solution into (Hf, Zr, Ti)O2 at 800°C, (3) carbothermal reduction reaction to form Ti-rich Ti(Hf, Zr)C and (Hf, Zr)-rich (Hf, Zr)TiC solid-solution at 800°C–1200°C, (4) diffusion to form a homogeneous HZT solid-solution ceramics at 1400°C–1600°C. The results particularly highlight the crucial role of curing atmosphere in controlling nanocrystal formation and subsequent phase evolution during pyrolysis. This investigation offers valuable theoretical insights and experimental references for understanding curing and pyrolysis process of multi-component solid-solution carbide ceramic precursors.
AB - This work systematically investigated the effects of curing atmospheres (air vs. nitrogen) on the pyrolysis mechanism of (Hf1/2Zr1/3Ti1/6)C (HZT) liquid precursor. The results indicated that curing in an air atmosphere led to the formation of HfO2 nanocrystals in the curing products. These nanocrystals served as nucleation sites during the following polymer-to-ceramic process, facilitating the generation of numerous small-sized oxide nanocrystals, which exhibited high reactivity and promoted the carbothermal reduction reaction. Detailed analysis of the Cued-Air samples demonstrated a complex phase evolution: (1) formation of HfO2, ZrO2, and TiO2 nanocrystals at 600°C, (2) solid-solution into (Hf, Zr, Ti)O2 at 800°C, (3) carbothermal reduction reaction to form Ti-rich Ti(Hf, Zr)C and (Hf, Zr)-rich (Hf, Zr)TiC solid-solution at 800°C–1200°C, (4) diffusion to form a homogeneous HZT solid-solution ceramics at 1400°C–1600°C. The results particularly highlight the crucial role of curing atmosphere in controlling nanocrystal formation and subsequent phase evolution during pyrolysis. This investigation offers valuable theoretical insights and experimental references for understanding curing and pyrolysis process of multi-component solid-solution carbide ceramic precursors.
KW - carbothermal reduction reaction
KW - curing atmosphere
KW - liquid precursor derived ceramic
KW - pyrolysis mechanism
UR - http://www.scopus.com/inward/record.url?scp=105007941818&partnerID=8YFLogxK
U2 - 10.1111/jace.70023
DO - 10.1111/jace.70023
M3 - Article
AN - SCOPUS:105007941818
SN - 0002-7820
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
ER -