原料对碳热还原法合成氮化铝粉末的影响  

Effect of starting materials on the synthesis of aluminum nitride powders by carbothermal reduction method

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

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《中南工业大学学报》2002年第5期505-508,共4页Journal of Central South University of Technology(Natural Science)

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

摘　　要：以氧化铝、碳黑、硝酸铝、葡萄糖为原料 ,采用 2种不同的工艺制备了氧化铝 碳黑和硝酸铝 葡萄糖 2种体系的原料混合物 ,研究了原料的种类对氮化铝粉末合成反应的影响 .研究结果表明 :以氧化铝和碳黑为原料时 ,氮化反应过程中只出现了α Al2 O3和AlN相 ,该原料体系反应速度较慢 ,在温度为 16 5 0℃时氮化 3～ 5h才能实现完全氮化 ;而以硝酸铝和葡萄糖为原料时 ,氮化反应过程中相变较复杂 ,出现了γ Al2 O3,α Al2 O3,AlON和AlN相 ,该原料体系反应速度较快 ,15 5 0℃时仅需 1～ 2h便可实现完全氮化 ;不同的起始原料不仅可以影响反应速度 ,还对粉末的粒度有较大影响 ,以氧化铝和碳黑为原料合成的氮化铝粉末的平均粒度约为 0 .7μm ;而以硝酸铝和葡萄糖为原料合成的氮化铝粉末的平均粒度约为 0 .1μm .Aluminum nitride powders were synthesized from Al_2O_3-carbon black system and Al(NO_3)_3·9H_2O-glucose system. The effects of starting materials on the synthesis of aluminum nitride powders were studied. The results show that only α-Al_2O_3 and AlN are detected and the reaction rate is slow during the nitridation process of Al_2O_3-carbon black system. A complete conversion for this system needs a high temperature of 1?650 ℃ and a long reaction period of 3～5 h. As for Al(NO_3)_3·9H_2O-glucose system, γ-Al_2O_3, α-Al_2O_3, AlON and AlN are detected during the nitridation process and reaction rate increases and a complete conversion is obtained at 1?550 ℃ for 1～2 h. Starting materials can affect the reaction rate as well as the size and morphology of AlN powders. The mean particle sizes of AlN powders synthesized from Al_2O_3-carbon black and Al(NO_3)_3·9H_2O-glucose are about 0.7 μm and 0.1 μm, respectively.

关 键 词：碳热还原法 合成 原料 氮化铝粉末 反应速度 粉末粒度 氮化铝陶瓷 

分 类 号：TQ174.758[化学工程—陶瓷工业]