Dynamic oxidation protective ultrahigh temperature ceramic TaB2-20%wtSiC composite coating for carbon material

TaB2–20%wtSiC composite coating containing high content of TaB2 was synthesized by liquid phase sintering method to enhance the anti-oxidation property of the carbon materials. The coated sample exhibits a trend of sustained weight gain whose final value is about 1.35%, while there is no weight loss...

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Bibliographic Details
Published in:Composites. Part B, Engineering Engineering, 2019-03, Vol.161, p.220-227
Main Authors: Ren, Xuanru, Wang, Wenhao, Shang, Tianqi, Mo, Hongsheng, Feng, Peizhong, Guo, Litong, Li, Ziyu
Format: Article
Language:English
Subjects:
Carbon-carbon composites (CCCs)
Heat treatment
High-temperature properties
Surface analysis
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Summary:TaB2–20%wtSiC composite coating containing high content of TaB2 was synthesized by liquid phase sintering method to enhance the anti-oxidation property of the carbon materials. The coated sample exhibits a trend of sustained weight gain whose final value is about 1.35%, while there is no weight loss zone in weight loss rate curves, but a rapid weight gain region around 800 °C. The generated compound glass layer presents a structure of Ta-oxides/TaBSiO/SiO2 triple glass layer. The rough surface of top Ta-oxides layer increases the oxidation defensive area of the glass layer, while the self-sealing TaBSiO/SiO2 compound glass ceramics layer can arrest the microcracks, blocking the fast diffusion channel of oxygen.
ISSN:1359-8368
1879-1069
DOI:10.1016/j.compositesb.2018.10.080