Investigating the highest melting temperature materials: A laser melting study of the TaC-HfC system.
Investigating the highest melting temperature materials: A laser melting study of the TaC-HfC system.
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DOI：
10.1038/srep37962
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发表时间：
2016-12-01
影响因子：
4.6
通讯作者：
Lee WE
中科院分区：
文献类型：
--
作者：
Cedillos-Barraza O;Manara D;Boboridis K;Watkins T;Grasso S;Jayaseelan DD;Konings RJ;Reece MJ;Lee WE
TaC、HFC及其固溶体具有很高的熔化温度(>；4000 K)等特性，有望成为高超声速飞行器热防护结构的候选材料。略低于化学计量比的TaC、HFC和三种固溶体成分(Ta1−xHfxC，x = 为0.8、0.5和0.2)的熔化温度长期以来一直被认为是已知的最高温度。在目前的研究中，使用激光加热技术对它们进行了重新评估，这是过去50年来的第一次。它们的熔点在4041-4232 K之间，其中氢氟碳化物的熔点最高，而三氯化铝的熔点最低。现场测量了热样品的光谱辐射度，表明这些化合物的光发射率在其热平衡中起着基础性的作用。独立的结果表明，HfC0.98的熔点为(4232 ± 84)K，是目前所研究的所有化合物中最高的。
TaC, HfC and their solid solutions are promising candidate materials for thermal protection structures in hypersonic vehicles because of their very high melting temperatures (>4000 K) among other properties. The melting temperatures of slightly hypostoichiometric TaC, HfC and three solid solution compositions (Ta1−xHfxC, with x = 0.8, 0.5 and 0.2) have long been identified as the highest known. In the current research, they were reassessed, for the first time in the last fifty years, using a laser heating technique. They were found to melt in the range of 4041–4232 K, with HfC having the highest and TaC the lowest. Spectral radiance of the hot samples was measured in situ, showing that the optical emissivity of these compounds plays a fundamental role in their heat balance. Independently, the results show that the melting point for HfC0.98, (4232 ± 84) K, is the highest recorded for any compound studied until now.
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影响因子：
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作者：
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影响因子：
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DOI：
10.1016/j.jeurceramsoc.2016.02.009
发表时间：
2016-06-01
影响因子：
5.7
作者：
Cedillos-Barraza, Omar;Grasso, Salvatore;Lee, William E.
通讯作者：
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