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熔盐中镁热还原合成二硼化钛纳米粉体

DOI: 10.7521/j.issn.0454-5648.2014.06.04

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Abstract:

以二氧化钛、硼粉、三氧化二硼、钛粉为原料,金属镁粉为还原剂,在NaCl-KCl熔盐中利用镁热还原法合成了TiB2纳米粉体。研究了TiO2-Mg-B和B2O3-Mg-Ti体系在熔盐中合成TiB2粉体的反应过程及机理,分析了两体系中合成TiB2的起始温度、最佳温度、形貌和尺寸的差异,对粉体的物相组成及显微结构进行了表征。结果表明2个体系合成TiB2的起始温度均为800℃,TiB2的结晶性及纯度随温度升高而提高,最佳合成温度均为1000℃。经1000℃保温4h后,TiO2-Mg-B体系合成的TiB2粉体形貌不规则,颗粒尺寸约为30~100nm;而在相同条件下,采用B2O3-Mg-Ti体系合成的立方形态的TiB2粉体颗粒尺寸约为40~200nm。B2O3在NaCl-KCl熔盐中的溶解度较TiO2高,更易被金属Mg还原,因此,B2O3-Mg-Ti体系合成的TiB2结晶性优于TiO2-Mg-B体系。

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