Effect of addition of tartaric acid on synthesis of boron carbide powder from condensed boric acid–glycerin product
Effect of addition of tartaric acid on synthesis of boron carbide powder from condensed boric acid–glycerin product
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DOI：
10.1016/j.jallcom.2013.03.255
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发表时间：
2013-10
影响因子：
6.2
通讯作者：
N. Tahara;Masaki Kakiage;I. Yanase;Hidehiko Kobayashi
中科院分区：
文献类型：
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作者：
N. Tahara;Masaki Kakiage;I. Yanase;Hidehiko Kobayashi
研究了酒石酸的加入对稠合硼酸-甘油合成碳化硼(B4C)粉末的影响。将等摩尔量的H3B3和甘油直接混合后，加入0-50mol%的酒石酸(以甘油计)，通过脱水缩合得到缩合产物，然后在空气中热分解，得到消除多余碳的前驱体粉末。与未加入酒石酸的前驱体相比，添加25mol%酒石酸的凝聚产物制备的前驱体中的B2O3和碳组分的分散状态更好，两种前驱体都具有三维双连续的B2O_3/碳网络结构。在较短的热处理时间内，前驱体B4C在1250℃下完全形成晶态B4C粉末，分散性好。由于形核位置的增加，合成的B4C粉末变得细小。
The effect of the addition of tartaric acid on the synthesis of boron carbide (B4C) powder from a condensed boric acid (H3BO3)–glycerin product was investigated in this study. The condensed product was prepared by dehydration condensation after directly mixing equimolar amounts of H3BO3and glycerin with the addition of 0–50mol% tartaric acid (based on glycerin), which was followed by thermal decomposition in air to obtain a precursor powder from which excess carbon had been eliminated. The dispersion state of the boron oxide (B2O3) and carbon components in the precursor prepared from the condensed product with 25mol% tartaric acid added was finer than that without tartaric acid added, in which both precursors had a three-dimensional bicontinuous B2O3/carbon network structure. The complete formation of crystalline B4C powder was achieved at 1250°C within a shorter heat treatment time for the precursor with a fine dispersion state. The synthesized B4C powders became fine owing to the increased number of nucleation sites.