以四氢呋喃作稳定剂,通过异丙醇铝在硝酸镁溶液中水解的Sol-Gel过程合成了MgAl2O4尖晶石纳米粉体,采用DTA、XRD及TEM等分析手段研究了其前驱体的晶化过程和不同煅烧温度对尖晶石粉体晶粒尺寸及烧结性能的影响。结果表明,该方法能明显降低MgAl2O4的合成温度,在900℃已能得到单一尖晶石相纳米粉体,一次粒子平均粒径约为20nm。并且,900℃煅烧的粉体烧结活性最高,在1600℃烧结即能获得相对密度为99％的致密尖晶石陶瓷。
MgAl2O4 spinel nanometer powders were synthesized via sol-gel process of aluminium
isopropoxide that hydrated in the solution of magnesium nitrate with tetrahydrofuran being stabilizer. The crystallization process of
MgAl2O4 precursor and the effect of calcination temperatures on spinel grain size and sinterability were investigated by DTA, XRD and
TEM. The results indicated that this method could lower the formation temperature of MgAl2O4 apparently. Monolithic spinel nanometer
powders were produced at the temperature as low as 900℃, with primary particle sizes of about twenty nanometers. The powder
calcined at 900℃ showd best sinterability, and dense spinel ceramic with 99% relative density could be obtained at the sintering
temperature as low as 1600℃.
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