Synthesis of ZrCx with controlled carbon stoichiometry by low temperature solid state reaction
Synthesis of ZrCx with controlled carbon stoichiometry by low temperature solid state reaction
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DOI：
10.1016/j.jeurceramsoc.2019.03.004
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发表时间：
2019-07
影响因子：
5.7
通讯作者：
Yue Zhou;T. Heitmann;W. Fahrenholtz;G. Hilmas
中科院分区：
文献类型：
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作者：
Yue Zhou;T. Heitmann;W. Fahrenholtz;G. Hilmas
以氢化锆粉和炭黑为原料，在1300~2000℃的反应温度范围内，采用固相法合成了碳化锆粉。在两种不同的起始ZrH_2：C比(1：0.60和1：0.98)下，对合成的ZrCx粉末的晶体结构、晶格参数和晶粒度进行了表征。在低至1600℃的温度下合成了化学计量比接近于0.98的粉末，而在较低温度下合成的粉末的碳含量较低，而无论起始的ZrH_2：C比如何。由于合成温度较低，微晶尺寸可达50 nm左右。当存在碳空位时，氧溶解到了ZrCx晶格中。中子衍射分析表明，随着合成温度的升高，碳化学计量比增加，溶解氧含量降低。
Zirconium carbide (ZrCx) powders were synthesized at temperatures between 1300℃ and 2000℃ by solid state reaction of zirconium hydride (ZrH2) and carbon black. Crystal structure, lattice parameters, and grain sizes of the as-synthesized ZrCxpowders were characterized for two different starting ZrH2:C ratios of 1:0.60 and 1:0.98. Powders with stoichiometry approaching ZrC0.98were synthesized at temperatures as low as 1600℃ whereas ZrCxpowders synthesized at lower temperatures had lower carbon contents regardless of the starting ZrH2:C ratio. Crystallite sizes as small as about 50 nm were obtained due to the low synthesis temperature. Oxygen dissolved into the ZrCxlattice when carbon vacancies were present. Neutron diffraction analysis was used to determine that carbon stoichiometry increased and dissolved oxygen content decreased as synthesis temperature increased.