原料对碳热还原法合成氮化铝粉末的影响
来源期刊：中南大学学报(自然科学版)2002年第5期
论文作者：秦明礼 曲选辉 林健凉 肖平安 祝宝军 汤春峰
文章页码：505 - 508
关键词：原料;氮化铝粉末;碳热还原
Key words：starting material; aluminum nitride powder; carbothermal reduction 文章编号:1005-9792(2002)05-0509-04
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- Al2O3和AlN相,该原料体系反应速度较慢,在温度为1 650℃时氮化3~5 h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-Al2O3,α- Al2O3,AlON和AlN相,该原料体系反应速度较快,1 550℃时仅需1~2 h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.
Abstract: Aluminumnitride powderswere synthesized from Al2O3-carbon black systemand Al(NO3) 3·9H2O-glucose system. The effects of starting materials on the synthesis of aluminum nitride powders were studied. The results show that only α- Al2O3 and AlN are detected and the reaction rate is slow during the nitridation process of Al2O3-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(NO3) 3·9H2O -glucose system,γ- Al2O3,α- Al2O3, AlON and AlN are detected during the nitridation process and reaction rate increases and a complete conversion is obtained at 1550℃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 Al2O3-carbon black and Al(NO3) 3·9H2O -glucose are about 0.7μm and 0.1μm, respectively.
