Qualitative analysis of hafnium diboride based ultra high temperature ceramics under oxyacetylene torch testing at temperatures above 2100°C
Qualitative analysis of hafnium diboride based ultra high temperature ceramics under oxyacetylene torch testing at temperatures above 2100°C
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2100℃以上氧乙炔炬测试下二硼化铪基超高温陶瓷的定性分析
DOI：
10.1016/j.jeurceramsoc.2013.11.018
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发表时间：
2014
影响因子：
5.7
通讯作者：
Carney C
中科院分区：
文献类型：
--
作者：
Carney C
采用氧乙炔焰炬对HfB_2-SiC、HfB_2-HfC、HfB_2-WC-SiC和HfB_2-WSi_2陶瓷进行了氧化试验。样品在2100至2300 °C之间氧化。从横截面图像中可以看出，鳞片不粘附是抗氧化性的限制因素。具有最佳结垢粘附性的样品是HfB 2-WSi 2。考虑了蒸汽压、热膨胀系数不匹配和相变等涉及尺度不粘附的因素。在比较样品的水垢粘附性时，假设蒸汽压累积是在测试样品中观察到的水垢粘附性差异的主要影响因素。然而，热膨胀系数的失配和HfO 2相变不能被忽略的贡献因素，在所有样品的规模非粘附。
Oxidation tests were carried out on HfB2–SiC, HfB2–HfC, HfB2–WC–SiC, and HfB2–WSi2ceramics using an oxyacetylene torch. The samples were oxidized between 2100 and 2300 °C. From cross-sectional images, scale non-adherence was noted as a limiting factor in oxidation resistance. The sample with the best scale adherence was HfB2–WSi2. Factors involving scale non-adherence such as vapor pressure, coefficient of thermal expansion mismatch and phase transformations were considered. In comparing the scale adherence of the samples it was hypothesized that vapor pressure buildup is the principal contributing factor in the scale adherence differences observed among the tested samples. However, the coefficient of thermal expansion mismatch and HfO2phase transformation cannot be neglected as contributing factors to scale non-adherence in all samples.