尿素溶液法合成纳米AlN粉体

以尿素为固体氮源,甲醇为溶剂,AlCl3·6H2O为铝源,采用尿素溶液法制备了纳米AlN粉体.采用FT-IR对前驱盐进行了结构分析,并通过XRD和SEM分别对最终煅烧产物进行了结构和形貌的表征.重点研究了尿素/金属摩尔比R值和煅烧温度对合成产物的晶体结构和形貌的影响.结果发现: AlN的纯度随R值的增加而增大,R值大于6可以获得单一AlN相,R值小于6获得AlN和Al2O3的混合相;此外,R值也直接影响到AlN纳米粉体和团聚颗粒的形貌,所制备AlN纳米粉体的粒径和团聚的球状颗粒的粒径随R值的增加出现细化的趋势.

Synthesis of Nano AlN Powder by Soft Urea Pathway

High pure nano-sized AlN powder was synthesized by a soft urea way with AlCl3·6H2O as an aluminums source, methanol as a solvent, urea as a solid N source.The structure of the AlN precursor salt was analyzed by FT-IR, the as-obtained powders were characterized by XRD and SEM.The effect of the urea/metal molar ratio R and the calcination temperatures on the crystal structure and morphology of AlN powders was studied significantly.The results show that pure AlN phase is obtained as the urea/metal molar ratio (R) is more than 6, and compound of AlN and Al2O3 are obtained when the R is less than 6;The mor-phology of AlN is also affected by the R value, the size of AlN powder and agglomeration particles decrease with the increase of R value.