Low-temperature preparation of titanium diboride fine powder via magnesiothermic reduction in molten salt
Low-temperature preparation of titanium diboride fine powder via magnesiothermic reduction in molten salt
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DOI：
10.1111/jace.14649
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发表时间：
2017-05-01
影响因子：
3.9
通讯作者：
Zhang, Shaowei
中科院分区：
文献类型：
--
作者：
Bao, Ke;Wen, Yan;Zhang, Shaowei
采用熔盐辅助镁热还原技术，以TiO2和B2O3为原料合成了100 ~ 200nm的相纯二硼化钛（TiB2）粉体。考察了盐种、Mg用量、反应温度、TiO2原料对合成过程的影响，并探讨了相关反应机理。在3种氯化盐（NaCl、KCl和MgCl2）中，MgCl2的加速效果最好。为了合成相纯TiB2，必须使用20mol%的过量Mg来补偿Mg的蒸发损失。原料TiO2的颗粒形状和大小对TiB2的形成及其形状和大小影响不大，这表明相对便宜和较粗的TiO2原料可以用于低温合成TiB2细颗粒。溶解-沉淀机制支配了整个熔盐合成过程。
Phase pure titanium diboride (TiB2) powder of 100-200nm was synthesized from TiO2 and B2O3 using a molten-salt-assisted magnesiothermic reduction technique. The effects of salt type, Mg amount, reaction temperature, and TiO2 raw materials on the synthesis process were examined and the relevant reaction mechanisms discussed. Among the three chloride salts (NaCl, KCl, and MgCl2), MgCl2 showed the best accelerating-effect. To synthesize phase pure TiB2, 20mol% excessive Mg had to be used to compensate for the evaporation loss of Mg. Particle shape and size of raw material TiO2 showed little effect on the formation of TiB2 and its shape and size, suggesting that relatively cheaper and coarser TiO2 raw materials could be used for low-temperature synthesis of TiB2 fine particles. The dissolution-precipitation mechanism governed the overall molten salt synthesis process.