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Reactive Preparation and Properties of ZrB2 Coating

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Author(s): ZHAO Dan, ZHANG Chang-Rui, ZHANG Yu-Di, CHEN Si-An, HU Hai-Feng

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 26;
Issue: 9;
Start page: 902;
Date: 2011;
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Keywords: ZrB2; ultra high temperature ceramics; coating; ablation resistance; C/SiC composite

ABSTRACT
In order to improve the ablation property of C/SiC composite at ultra high temperatures, ZrB2 coatings upon C/SiC composite were prepared by pasting the slurry of zirconium powder, boron powder and phenolic resin, followed by high temperature sintering. The reactions in the sintering process were investigated, and the component, microstructure and ablation property of the coatings were characterized. The results show that zirconium powder reacts firstly with pyrolytic carbon to form ZrC till 1200¡æ, and then ZrC reacts with boron to form ZrB2 during 1400¡æ―1600¡æ. When the mole ratio of Zr/B/C is 1.0/1.5/1.0, the coating sintered at 1600¡æ is composed of mainly ZrB2, small amount of ZrC and ZrO2. After ablation for 60 s in oxyacetylene torch environment, the C/SiC composite with ZrB2 coating shows a linear recession rate of zero, due to the ZrO2 formation from ZrB2 oxidation, while the C/SiC composite without coating shows a linear recession ratio of 0.064mm/s.

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