Reactive Preparation and Properties of ZrB2 Coating

doi:10.3724/SP.J.1077.2011.00902

Abstract

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℃, and then ZrC reacts with boron to form ZrB₂during 1400℃-1600℃. When the mole ratio of Zr/B/C is 1.0/1.5/1.0, the coating sintered at 1600℃ 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.

Key words: ZrB₂, ultra high temperature ceramics, coating, ablation resistance, C/SiC composite

CLC Number:

TG146

ZHAO Dan, ZHANG Chang-Rui, ZHANG Yu-Di, CHEN Si-An, HU Hai-Feng. Reactive Preparation and Properties of ZrB₂ Coating[J]. Journal of Inorganic Materials, 2011, 26(9): 902-906.

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Reactive Preparation and Properties of ZrB₂ Coating

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