Effects of LaB6 addition on arc-jet convectively heated SiC-containing ZrB2-based ultra-high temperature ceramics in high enthalpy supersonic airflows
Effects of LaB6 addition on arc-jet convectively heated SiC-containing ZrB2-based ultra-high temperature ceramics in high enthalpy supersonic airflows
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DOI：
10.1016/j.corsci.2013.06.029
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发表时间：
2013-10
影响因子：
8.3
通讯作者：
F. Monteverde;D. Alfano;R. Savino
中科院分区：
文献类型：
--
作者：
F. Monteverde;D. Alfano;R. Savino
研究了ZrB 2-SiC-LaB 6超高温陶瓷在高焓超声速气流中的性能。的UHTC材料达到并保持稳定状态的辐射表面温度为1973 K（高温计监测）5分钟，并幸存的电弧喷射等离子体暴露没有任何光学证据的机械损伤。样品表面的氧化膜演化为不同的织构。通过计算流体动力学处理的瞬态热分析提供了一个很好的协议之间的数值稳态温度和实验获得的温度分布。在ZrB 2中同时添加LaB 6和SiC对整体抗氧化性有不利影响。
The performances of a ZrB2–SiC–LaB6ultra-high temperature ceramic (UHTC) was investigated in high enthalpy supersonic air flow. The UHTC material reached and maintained steady-state radiative surface temperature of 1973 K (monitored by pyrometer) for 5 min, and survived the arc-jet plasma exposure without any optical evidence of mechanical damage. The oxide scale covering externally the sample evolved into different textures. Transient thermal analysis processed via CFD provided a good agreement between the numerical steady-state temperature and the temperature distribution obtained experimentally. The contemporary addition of LaB6and SiC to ZrB2had a detrimental effect on the overall oxidation resistance.