超细硼化锆粉体纯化工艺探究

发布时间：2018-04-28 04:01

本文选题：硼化锆 + 纯化工艺　；参考：《硅酸盐通报》2017年08期

【摘要】：探究了超细ZrB_2粉体化学提纯、热处理等纯化工艺过程中的影响因素。并采用热重-差热分析仪、X射线衍射仪、扫描电镜、透射电镜和X射线荧光光谱分析仪对ZrB_2粉体及热处理后的水洗产物进行表征和分析。结果表明:B_2O_3易溶于热水生成硼酸溶液,为了有效地除去B_2O_3,需经过热水反复洗涤、过滤;随着热处理温度增加,粉体中的C杂质逐渐氧化挥发,但当热处理温度升至700℃时,产物中的ZrB_2被氧化生成ZrO_2,致使产物迅速增重;热处理温度650℃和热处理时间80 min为最佳热处理除杂工艺,此时产物中残留的碳基本全部被除去,但是产物中氧含量较高,后期研究建议选择在惰性气氛中进行。
[Abstract]:The factors affecting the purification of ultrafine ZrB_2 powder by chemical purification, heat treatment and other purification processes were investigated. The ZrB_2 powder and the water washing products after heat treatment were characterized and analyzed by thermogravimetric differential thermal analyzer, X ray diffractometer, scanning electron microscope, transmission electron microscope and X ray fluorescence spectrometer. The results showed that B_2O_3 was easily dissolved in hot water. In order to remove the B_2O_3 effectively, in order to remove the boric acid effectively, it needs to be washed and filtered through hot water. As the heat treatment temperature increases, the C impurities in the powder gradually oxidize and volatilize, but when the heat treatment temperature rises to 700 C, the ZrB_2 in the product is oxidized to ZrO_2, resulting in the product's rapid weight gain, the heat treatment temperature 650 and the heat treatment time 80 min are the best heat. In the process of removing impurity, the residual carbon in the product is basically removed, but the oxygen content in the product is higher. Later research suggests that it should be selected in inert atmosphere.

【作者单位】：昆明理工大学材料科学与工程学院;
【基金】：国家自然科学基金(U1037601)
【分类号】：TQ174.6

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