Oxidation of ZrB2–SiC ultra-high temperature composites over a wide range of SiC content
Oxidation of ZrB2–SiC ultra-high temperature composites over a wide range of SiC content
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DOI：
10.1016/j.jeurceramsoc.2012.05.021
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发表时间：
2012-11
影响因子：
5.7
通讯作者：
Peter A. Williams;R. Sakidja;J. Perepezko;P. Ritt
中科院分区：
文献类型：
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作者：
Peter A. Williams;R. Sakidja;J. Perepezko;P. Ritt
研究了SiC含量为20 ~ 80vol%的ZrB_2-SiC超高温陶瓷在1773 K下氧化50 h和2073 K下氧化20 min的氧化性能。氧化反应途径进行了解释，使用ZrB 2-SiC系统的挥发图。在1773 K保温50 h后，SiC含量为20 ~ 80vol%的ZrB_2-SiC复合材料表面均形成了一层SiO_2保护层。SiC含量≤50vol%的样品在1773 K和2073 K下形成了明显的SiC耗尽层。在约2073 K下进行20 min的高温火炬测试表明，具有≥65vol% SiC的样品在火炬火焰下表现出凹陷。富ZrB 2的样品在类似的暴露后主要由ZrO 2层。在超高温陶瓷中加入65vol%以上的SiC，可以降低陶瓷的整体重量密度，改善陶瓷在1773 K的氧化性能。
The oxidation performance of ZrB2–SiC ultra-high temperature ceramics with SiC content ranging from 20 to 80vol% has been evaluated at 1773K for 50h and at 2073K for 20min. Oxidation reaction pathways were interpreted using volatility diagrams of the ZrB2–SiC system. At 1773K for 50h, all ZrB2–SiC composites from 20 to 80vol% SiC formed a protective SiO2surface coating. Samples with ≤50vol% SiC developed a distinguishable SiC-depleted layer at 1773K and 2073K. High temperature torch testing for 20min at approximately 2073K revealed that samples with ≥65vol% SiC exhibit a depression under the torch flame. Samples rich in ZrB2were dominated by a ZrO2layer after a similar exposure. The overall weight density of ultra-high temperature ceramics can be reduced with improved oxidation performance at 1773K by adding at least 65vol% SiC.