Multicomponent (Hf-Zr-Ta)B2 coatings for carbon/carbon composites and structural optimization enabling superior ablation resistance

Junshuai Lv, Wei Li, Tao Li, Ben Gao, Jiachen Li, Yanqin Fu, Lingxiang Guo, Yulei Zhang

科研成果: 期刊稿件文章同行评审

18 引用 (Scopus)

摘要

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.

源语言英语
页(从-至)115-126
页数12
期刊Journal of Materials Science and Technology
204
DOI
出版状态已出版 - 1 1月 2025

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