發(fā)布時間：2018-04-28 04:01

  本文選題：硼化鋯 + 純化工藝�。� 參考：《硅酸鹽通報》2017年08期

【摘要】：探究了超細ZrB_2粉體化學提純、熱處理等純化工藝過程中的影響因素。并采用熱重-差熱分析儀、X射線衍射儀、掃描電鏡、透射電鏡和X射線熒光光譜分析儀對ZrB_2粉體及熱處理后的水洗產(chǎn)物進行表征和分析。結果表明:B_2O_3易溶于熱水生成硼酸溶液,為了有效地除去B_2O_3,需經(jīng)過熱水反復洗滌、過濾;隨著熱處理溫度增加,粉體中的C雜質(zhì)逐漸氧化揮發(fā),但當熱處理溫度升至700℃時,產(chǎn)物中的ZrB_2被氧化生成ZrO_2,致使產(chǎn)物迅速增重;熱處理溫度650℃和熱處理時間80 min為最佳熱處理除雜工藝,此時產(chǎn)物中殘留的碳基本全部被除去,但是產(chǎn)物中氧含量較高,后期研究建議選擇在惰性氣氛中進行。
[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.

【作者單位】： 昆明理工大學材料科學與工程學院;
【基金】：國家自然科學基金(U1037601)
【分類號】：TQ174.6

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