TY - JOUR
T1 - Multicomponent (Hf-Zr-Ta)B2 coatings for carbon/carbon composites and structural optimization enabling superior ablation resistance
AU - Lv, Junshuai
AU - Li, Wei
AU - Li, Tao
AU - Gao, Ben
AU - Li, Jiachen
AU - Fu, Yanqin
AU - Guo, Lingxiang
AU - Zhang, Yulei
N1 - Publisher Copyright:
© 2024
PY - 2025/1/1
Y1 - 2025/1/1
N2 - Multicomponent (Hf-Zr-Ta)B2 potentially provides improved ablation resistance compared with silicon-based ceramics. Here we deposited (Hf0.5–x/2Zr0.5–x/2Tax)B2 (x = 0, 0.1, and 0.2) coatings onto C/C composites, and investigated their ablation behaviors under an oxyacetylene torch with a heat flux of 2.4 MW m–2. It was observed that the x = 0.1 oxide scale bulged but was denser, and the x = 0.2 oxide scale was blown away due to the formation of excessive liquid. Based on these findings, we further developed a duplex (Hf-Zr-Ta)B2 coating that showed a linear recession rate close to zero (0.11 μm s–1) after two 120-s ablation cycles. It is identified that the resulting oxide scale is mainly composed of (Hf, Zr)6Ta2O17 and (Hf, Zr, Ta)O2 by performing aberration-corrected (scanning) transmission electron microscopy. The protective mechanism is related to the peritectic transformation of orthorhombic-(Hf, Zr)6Ta2O17 to tetragonal-(Hf, Zr, Ta)O2 plus Ta-dominated liquid. This study contributes to the development of Ta-containing multicomponent UHTC bulk and coatings for ultra-high temperature applications.
AB - Multicomponent (Hf-Zr-Ta)B2 potentially provides improved ablation resistance compared with silicon-based ceramics. Here we deposited (Hf0.5–x/2Zr0.5–x/2Tax)B2 (x = 0, 0.1, and 0.2) coatings onto C/C composites, and investigated their ablation behaviors under an oxyacetylene torch with a heat flux of 2.4 MW m–2. It was observed that the x = 0.1 oxide scale bulged but was denser, and the x = 0.2 oxide scale was blown away due to the formation of excessive liquid. Based on these findings, we further developed a duplex (Hf-Zr-Ta)B2 coating that showed a linear recession rate close to zero (0.11 μm s–1) after two 120-s ablation cycles. It is identified that the resulting oxide scale is mainly composed of (Hf, Zr)6Ta2O17 and (Hf, Zr, Ta)O2 by performing aberration-corrected (scanning) transmission electron microscopy. The protective mechanism is related to the peritectic transformation of orthorhombic-(Hf, Zr)6Ta2O17 to tetragonal-(Hf, Zr, Ta)O2 plus Ta-dominated liquid. This study contributes to the development of Ta-containing multicomponent UHTC bulk and coatings for ultra-high temperature applications.
KW - Ablation resistance
KW - C/C composites
KW - Coating
KW - Multicomponent
KW - Ultra-high temperature ceramics
UR - http://www.scopus.com/inward/record.url?scp=85192747142&partnerID=8YFLogxK
U2 - 10.1016/j.jmst.2024.03.050
DO - 10.1016/j.jmst.2024.03.050
M3 - 文章
AN - SCOPUS:85192747142
SN - 1005-0302
VL - 204
SP - 115
EP - 126
JO - Journal of Materials Science and Technology
JF - Journal of Materials Science and Technology
ER -