陆鹏.doc

摘要
MgAl2O4纳米陶瓷具有广阔的应用前景,因此制备MgAl2O4纳米颗粒粉体具有重要的意义。本文以硝酸镁和硝酸铝为主要原料,并分别用NH3·H2O、NH4HCO3、四乙烯五胺为沉淀剂,采用共沉淀法制备纳米粉体。研究了不同沉淀剂、不同滴定方式以及不同煅烧温度下制备的粉体的效果。
研究结果表明,在使用NH3·H2O、NH4HCO3、四乙烯五胺为沉淀剂中,四乙烯五胺所制得的纳米粉体晶粒尺寸最小。用NH4HCO3做沉淀剂研究正反滴定,无论从实验过程还是实验结果都表明反向滴定要正向滴定效果好。粉体煅烧在800℃尖晶石相已经初步形成,但是各衍射峰强度相对较低,尖晶石粉体颗粒粒径较小,粉体的活性较大。随着煅烧温度的提高,尖晶石相晶型发育更加完善。当温度达到1000℃时,形成完善的尖晶石相结构。
关键词:纳米颗粒;共沉淀;MgAl2O4;透明陶瓷
Abstract
Since MgAl2O4 nano ceramics have a promising future in application, it is of great significance to prepare MgAl2O4 nanoparticles. With magnesium nitrate and aluminum nitrate as raw materials and NH3·H2O, NH4HCO3 and TEPA as precipitants, this paper employs co-precipitation method to prepare nanoparticles and studies the effects of the particles prepared using different precipitants, adopting different titration methods and under different calcinations temperature.
The research shows that when using NH3·H2O, NH4HCO3 and TAPE as precipitants, the nanoparticles obtained from TEPA are the smallest in size. When using NH4HCO3 as precipitant to study positive and negative titration, both the experiment process and the experiment results show that the effect of negative titration is better than that of the positive titration. When the particles are calcined at 800℃, a spinel phase begins to take shape, but the intensity of the diffraction peaks is relatively low, the diameter of Alumina-Magnesia Spinel nanoparticles is relatively small and the a ctivity of these particles are relatively high. With the rise of calcination temperature, the development of the spinel phase es more perfect, and when the temperature reaches 1000℃, a perfect spinel phase structure will be formed.
Keywords:Nanoparticle, Coprecipitation; MgAl2O4 ; Transparent ceramics
目录
摘要 I
Abstract II
目录 III
第一章文献综述 1
1
MgAl2O4的分子结构 1
镁铝尖晶石的性质和应用 2
纳米陶瓷粉体 4
镁铝尖晶石粉体的制备方法 4
镁铝尖晶石粉体的制备的研究方向 10
镁铝尖晶石粉体制备中存在的问题 11
MgAl2O4尖晶石透明陶瓷的研究现状 12
本工作主要研究内容 14
第二章实验部分 15
实