Liquid precursor-derived high-entropy carbide nanopowders
Liquid precursor-derived high-entropy carbide nanopowders
复制标题
液体前体衍生的高熵碳化物纳米粉末
DOI：
10.1016/j.ceramint.2019.07.244
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发表时间：
2019-12-01
影响因子：
5.2
通讯作者：
Zhang, Guo-Jun
中科院分区：
文献类型：
--
作者：
Li, Fei;Lu, Ying;Zhang, Guo-Jun
我们报告了一种用于合成单相高熵碳化物（HEC）纳米粉末的简单液体前驱体方法。使用过渡金属卤化物(TiCl4、ZrCl4、HfCl4、NbCl5、TaCl5)和糠醇作为金属源和碳源。该液态前驱体可在1400℃真空下碳热还原转化为五种二元碳化物的混合物，并可在2000℃热处理固溶体进一步转化为单相HEC纳米粉体。合成的HEC纳米粉体平均粒径为132+/-5nm，比表面积为24.5m(2)/g，氧含量为分别为 0.22 重量％。
We report a simple liquid precursor method for the synthesis of single-phase high-entropy carbide (HEC) nanopowders. Transition metal halides (TiCl4, ZrCl4, HfCl4, NbCl5, TaCl5) and furfuryl alcohol are used as metal sources and carbon source. The liquid precursor can be converted into mixtures of five binary carbides via carbothermal reduction at 1400 degrees C in vacuum, and can be further transformed into single-phase HEC nanopowders through solid solution formation by heat treatment at 2000 degrees C. The as-synthesized HEC nanopowders possess an average particle size of 132 +/- 5 nm, a specific surface area of 24.5 m(2)/g, and an oxygen content of 0.22 wt%, respectively.