摘要
以氨基乙酸和尿素为燃料,用溶液燃烧合成法制备了 MgAl2O4 纳米粉体,并研究了氨基乙酸和尿素的摩尔比(0:1,2:9 和 1:1)对粉体特性和烧结性能的影响。对粉体的扫描电子显微照片分析发现:用两种混合燃料制备的 MgAl2O4 粉体呈多孔状结构,且实验所用混合燃料有利于 MgAl2O4粉体的分散。结果表明:颗粒(团聚体)的平均粒径随所用燃料中氨基乙酸含量的增加而明显减小,粉体的比表面积随氨基乙酸含量的增加而显著增大,表明所用的混合燃料能显著降低 MgAl2O4粉体的团聚程度。此外,MgAl2O4粉体的烧结性能随所用燃料中氨基乙酸含量的增加而显著提高。
Nanoscale MgAl2O4 powders were synthesized by a solution combustion route using glycine and urea as fuels. The effects of glycine to urea mole ratio （0：1, 2：9 and 1：1, respectively） on the characteristics and sinterability of powders were investigated. The scanning electron micrographs show that the powders from two fuel mixtures are of porous structure and the fuel mixtures can make a significant contribution to dispersion of as-prepared powders. The experimental results disclose that the average size of agglomerates decreases significantly and the specific surface area of the powders remarkably increases with the increase of the glycine to urea mole ratio in the three precursors, indicating that agglomeration in as-produced MgAl2O4 powders from the fuel mixtures significantly decreases. Moreover, the sinterability of MgAl2O4 powders markedly increases as the glycine to urea mole ratio in the three pre-cursors is raised.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2010年第5期969-973,共5页
Journal of The Chinese Ceramic Society
基金
山东省教育厅科技基金(J08LA10)资助项目
关键词
溶液燃烧合成
尖晶石
烧结性能
纳米粉体
solution combustion synthesis
spinel
sintering
nanoscale powders
