Microstructure and Ablation Behavior of C/C Composites Doped with ZrB2

doi:10.3724/SP.J.1077.2011.10918

Journal of Inorganic Materials ›› 2011, Vol. 26 ›› Issue (6): 669-672.DOI: 10.3724/SP.J.1077.2011.10918

• Research Letter • Previous Articles

Microstructure and Ablation Behavior of C/C Composites Doped with ZrB₂

SUN Hui-Hui, LI He-Jun, SHEN Xue-Tao, CAO Gao-Xiang, QIANG Xin-Fa, REN Xiao-Bin, FU Qian-Gang

(State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China)

Received:2010-12-28 Revised:2011-03-02 Published:2011-06-20 Online:2011-06-07
About author:SUN Hui-Hui(1986-), female, candidate of master. E-mail: sunhuihui4243@126.com
Supported by:
National Natural Science Foundation of China (50832004, 90716024); the “111” Project (08040)

Abstract

Abstract: ZrB₂ was first introduced into carbon preforms through ultrasonic and vacuum immersion-carbonthermal reduction method. After densification using thermal gradient chemical vapor in-ltration and graphitization, ZrB₂ doped C/C composites were prepared. The oxyacetylene ablation results show that the linear and mass ablation rates of the composites after doping with 6.87wt% ZrB₂ decreased by 64.9% and 67.5%, respectively. The ablation of C/C composites is mainly controlled by thermochemical and thermophysical reactions and mechanical denudation does not play a dominant role. The evaporation of ZrO₂/B₂O₃ during ablation would take away large amounts of heat, reducing the thermal impact of flame to the ablation surface.

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Key words: ablation, ZrB₂, C/C composites, ZrO₂

CLC Number:

TB332

SUN Hui-Hui, LI He-Jun, SHEN Xue-Tao, CAO Gao-Xiang, QIANG Xin-Fa, REN Xiao-Bin, FU Qian-Gang. Microstructure and Ablation Behavior of C/C Composites Doped with ZrB₂[J]. Journal of Inorganic Materials, 2011, 26(6): 669-672.

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Microstructure and Ablation Behavior of C/C Composites Doped with ZrB₂

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