Ablation behavior of ZrB₂–SiC ultra high temperature ceramics under simulated atmospheric re-entry conditions

详细信息	查看全文 | 推荐本文 |

• 作者：Xinghong Zhang ; Ping Hu ; Jiecai Han ; Songhe Meng
• 关键词：A. ZrB₂ ; A. SiC ; B. Ablation behavior
• 刊名：Composites Science and Technology
• 出版年：2008
• 期刊代码：19_02663538
• 类别：ms
• 出版时间：June 2008
• 卷：68
• 期：7-8
• 页码：1718-1726
• 文件大小：1758 K

摘要

ZrB₂–20vol%SiC ultra high temperature ceramic (UHTC) was prepared by hot-pressing. Ablation tests of the flat-face models were conducted under ground simulated atmospheric re-entry conditions using arc-jet testing with heat fluxes of 1.7 MW/m² and 5.4 MW/m² under subsonic conditions, respectively. There was little weight or configuration change after ablation at a heat flux of 1.7 MW/m². However, ZrB₂–SiC composite underwent severe ablation and whose surface temperatures exceeded 2300 °C at a heat flux of 5.4 MW/m². Sharp-shape leading edge models were ablated under supersonic conditions with the stagnation pressure and Mach number of 1.2 atm and 2.7 M, respectively, and sharp-shaped leading edge C/SiC models were also ablated under the same condition for comparison. ZrB₂–SiC composite exhibited an excellent thermal-oxidative and configurational stability in the simulated re-entry environment compared with C/SiC material. Results indicate that ZrB₂–SiC ultra high temperature ceramics are the potential candidates for leading edges. The temperature limit for UHTC is controlled by the softening and degradation of the formed oxide scale.