Thermophysical characterisation of ZrC x N y ceramics fabricated via carbothermic reduction-nitridation
Thermophysical characterisation of ZrC x N y ceramics fabricated via carbothermic reduction-nitridation
复制标题
碳热还原氮化制备 ZrC x N y 陶瓷的热物理表征
DOI：
10.1016/j.jnucmat.2014.07.030
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发表时间：
2014
影响因子：
3.1
通讯作者：
Harrison R
中科院分区：
文献类型：
--
作者：
Harrison R
采用两步碳热还原氮化法制备了ZrCxNy陶瓷，研究了该陶瓷在2200 K下的热物理性能。氮化机制的初步证据表明，在ZrC颗粒表面的气-固相反应，这是第一个这样的观察与此系统。电导率和热导率高于市售的ZrC和ZrN。室温下ZrC x N y相的热导率值在35 - 43 Wm− 1 K− 1之间，由于电子对热传导的贡献增加，随着氮含量的增加而增加，并随着温度的增加而增加到40-50 Wm− 1 K− 1。电导率随氮含量的增加而增加，其值在100-450× 104 Ω-1m1之间，但随温度的升高而降低，表现出金属性。
Thermophysical properties of ZrC x N y ceramics prepared from powders produced via a two-step carbothermic reduction–nitridation of zirconia were characterised to 2200 K. Preliminary evidence for the mechanism of nitridation shows a gas–solid phase reaction at the ZrC particle surface which is the first such observation with this system. Electrical and thermal conductivities were higher than commercially available ZrC and ZrN. Thermal conductivity values of the ZrC x N y phases at room temperature were between 35 and 43 Wm− 1 K− 1, increasing with nitrogen content due to increased electronic contribution to thermal conduction and increased to 40–50 Wm− 1 K− 1 with temperature. Electrical conductivity also increased with nitrogen content and values were in the range of 100–450× 10 4 Ω-1 m 1, but decreased with increasing temperature showing metallic behaviour.