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Journal of Inorganic Materials

Journal of Inorganic Materials >

2008 , Vol. 23 >Issue 4: 734 - 738

DOI: https://doi.org/10.3724/SP.J.1077.2008.00734

Research Paper

Ablation Mechanism of ZrB2-SiC and Csf/ZrB2-SiC Ultra-high Temperature Ceramic Composites

  • YANG Fei-Yu ,
  • ZHANG Xing-Hong ,
  • HAN Jie-Cai ,
  • DU Shan-Yi
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  • Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150001, China

Received date: 2007-08-21

  Revised date: 2007-11-21

  Online published: 2008-07-20

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Abstract

ZrB2-SiC and Csf/ZrB2-SiC, two kinds of ultra-high temperature ceramic composites were fabricated by hot-pressing. The ablation behavior of them was studied by oxyacetylene torch test at a heat flux of 4186.8kW/m2 for 180s. For ZrB2-SiC, the surface temperature increases to 2406℃ during torch test and the average mass loss is -0.14%, linear ablation rate is
-1×10-3mm/s. For Csf/ZrB2-SiC, the maximum surface temperature is 1883℃, and the average mass loss is -0.19%, linear ablation rate is -4×10-4mm/s. From the surface and cross section analysis it is found that loosen ZrO2 oxidation layer, SiC rich layer and unaltered layer form from outer layer to inner layer in ablated ZrB2-SiC microstructure, where SiC rich layer has oxidation resistance. For Csf/ZrB2-SiC, ZrO2-SiO2 oxidation layer, SiC depletion layer and unaltered layer distribute from outer layer to inner layer, where the SiO2 filled ZrO2 oxidation layer formed in the surface can prevent
oxygen effectively.

Key words： ZrB2-SiC; Csf /ZrB2-SiC; ultra-high temperature ceramic composites; ablation mechanism

Cite this article

YANG Fei-Yu , ZHANG Xing-Hong , HAN Jie-Cai , DU Shan-Yi . Ablation Mechanism of ZrB2-SiC and Csf/ZrB2-SiC Ultra-high Temperature Ceramic Composites[J]. Journal of Inorganic Materials, 2008 , 23(4) : 734 -738 . DOI: 10.3724/SP.J.1077.2008.00734

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