尿素对前驱物及氮化铝粉末粒度形貌的影响  

EFFECT OF UREA ON THE MORPHOLOGY OF PRECURSOR AND ALUMINUM NITRIDE POWDERS

作　　者：秦明礼[1] 曲选辉[1] 肖平安[2] 林健凉[2] 汤春峰[2] 祝宝军[2] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]中南大学

出　　处：《硅酸盐学报》2003年第4期351-355,共5页Journal of The Chinese Ceramic Society

基　　金：国家杰出青年科学基金 (5 0 0 2 5 412 );国家重点基础研究发展规划 (G2 0 0 0 0 672 0 3)资助项目

摘　　要：以硝酸铝 [Al(NO3) 3·9H2 O]、葡萄糖 [C6 H1 2 O6 ·H2 O]为原料 ,利用碳热还原法制备氮化铝粉末 ,研究了尿素对前驱物及其氮化反应产物的组成和显微形貌的影响。研究发现 :尿素不仅可以影响前驱物的组成和显微形貌 ,还对氮化反应产物的显微形貌有重要影响。在溶液里添加尿素后 ,它与硝酸铝发生了低温燃烧合成反应 ,生成了比表面积高的泡沫状前驱物 ,该过程中碳燃烧损失较大。在没有添加尿素的溶液中 ,没有燃烧反应发生 ,碳的损失小 ,生成的前驱物团聚现象严重 ,比表面积低。两种前驱物的氮化反应产物保留了各自前驱物的形貌特征 ,对于不添加尿素合成的前驱物 ,在其氮化反应后所生成的氮化铝粉末板结严重 ;而添加尿素合成的前驱物的氮化反应产物是由球形颗粒组成的软团聚体。利用XRD 。Aluminum nitride powders were synthesized by the carbothermal reduction method from aluminum nitrate [Al(NO3)3&middot9H2O] and glucose (C6H12O6&middotH2O). The effects of urea on the morphology and the composition of the precursor and its nitridation products were studied. It is found that urea could affect not only the morphology and the composition of the precursor but also the morphology of the AlN powders. When urea is added in the solution, a low-temperature combustion process takes place between urea and aluminum nitrate accompanied with lots of carbon loss in the process, which results in forming a precursor with high specific surface area. Whereas no combustion reaction occurs when the solution without urea is used and a badly agglomerated precursor is formed. The carbon loss is relatively low in this process. The AlN powder synthesized in the experiment retains the morphology of the precursors. The powder obtained from the precursor prepared without urea is agglomerated badly, while the powder synthesized from the precursor prepared with urea is a soft aggregate in the fine particle form, which can be easily dispersed. The powder prepared in this method was analyzed by XRD and SEM.

关 键 词：氮化铝 尿素 前驱物 碳热还原 

分 类 号：TQ172[化学工程—水泥工业]