溶胶-凝胶法制备纳米镁铝尖晶石纳米粉  

Synthesis of MgAl_2O_4 Spinel Nannopowder by Sol-gel Process

作　　者：张显[1] 曾庆丰[2] 郝富锁 

机构地区：[1]西安电子科技大学技术物理学院,西安710071 [2]西北工业大学超高温结构复合材料国防科技重点实验室,西安710072 [3]阳泉市华夏高级耐火材料有限公司,阳泉045202

出　　处：《硅酸盐通报》2009年第B08期130-133,共4页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(No.50802076)

摘　　要：以硝酸镁和硝酸铝为原料,柠檬酸为络合剂,混合后制得柠檬酸盐先驱体,并将脲加到柠檬酸盐先驱体中,得到另一种新的含脲柠檬酸盐先驱体。两种先驱体分别经800℃和1000℃煅烧,可得到镁铝尖晶石纳米粉。XRD分析表明,800℃煅烧已有镁铝尖晶石形成,镁铝尖晶石结晶化程度随煅烧温度的升高而提高,而在同一热处理温度下,含脲柠檬酸盐前驱体比柠檬酸盐前驱体制得的纳米镁铝尖晶石颗粒细。TEM结果表明:800℃煅烧含脲柠檬酸盐可得到的镁铝尖晶石纳米粉体,颗粒大小均匀,粒径尺寸在20～30nm。A new precursor was obtained by adding urea to the original citrate precursor. The MgAl2O4 spinel nannopowder was synthesized by the sol-gel combustion process of the both precursors sintered at 800 ℃ and 1000 ℃, respectively. The synthesis mechanism of the MgAIEO4 spinel nannopowder is discussed based on the results of XRD and TEM. The MgAl2O4 spinel is formed at 800℃, The crystallinity of MgAl2O4 spinel depends on the calcination temperature： the higher the temperature, the higher the crystallinity. In addition, the size of MgAl2O4 spinel nanopowder synthesized by the sol-gel combustion process of Aluminum-Mgnesium Citrate with urea is finer than that by the sol-gel combustion process of Aluminum-Mgnesium Citrate without urea at same temperature. Nano- MgAl2O4 with the particle size of about 20 - 30 nm was prepared by sol-gel combustion process of the aluminum-mgnesium citrate-urea precursor at 800 ℃.

关 键 词：纳米粉 镁铝尖晶石 溶胶-凝胶法 柠檬酸铝镁盐 尿素 

分 类 号：TQ174[化学工程—陶瓷工业]