期刊
COMPOSITES PART B-ENGINEERING
卷 251, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2022.110467
关键词
Medium entropy carbide; First -principles calculations; Carbothermal reduction; Carbon; carbon composites; MEC coating; Ablation resistance
Compared to conventional monocarbides, the oxides of medium/high-entropy carbides (M/HECs) show excellent antioxidant resistance and high-temperature structural stability, with great potential to enhance the oxidation/ablation resistance of carbon/carbon (C/C) composites. The novel MEC (Hf1/3Zr1/3Ti1/3)C coating prepared on SiC-coated C/C composites significantly prolongs the anti-ablation time above 2100 degrees C in an oxyacetylene flame ablation environment, compared to monocarbide coating. The unique structure of oxide scale formed by the MEC coating provides a new way to improve the ablation resistance of monocarbide coatings and shows promise for new-generation structural materials at ultra-high temperature environments.
Compared to conventional monocarbides, the oxides of medium/high-entropy carbides (M/HECs) expressed excellent antioxidant resistance and high-temperature structural stability, which are great potential to improve the oxidation/ablation resistance of carbon/carbon (C/C) composites. M/HECs ceramics coated C/C composites are ideal long-term ablation-resistant structural materials applied in ultra-high-temperature (above 2100 degrees C) and oxygen-containing environments. This work reported a novel MEC (Hf1/3Zr1/3Ti1/3)C coating first prepared on SiC-coated C/C composites. The fabricated MEC coating significantly prolonged the anti-ablation time (more than 210 s) above 2100 degrees C in an oxyacetylene flame ablation environment with a heat flux of 2.4 MW/m2, compared to monocarbide coating (less than 90 s). The ablated surface of MEC coating was composed of amorphous Zr-Hf-Ti-C-O oxycarbide pinned by m-(Hf, Zr, Ti)O2 nanoparticles, forming a unique structure of oxide scale for long-term ablation resistance. This work provides a new way to improve the ablation resistance of monocarbide coatings and develops a great promise for new-generation structural materials at ultra-high temperature environments.
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