纳米镁铝尖晶石粉体的低温燃烧合成与表征

发布时间：2018-05-13 22:32

  本文选题：镁铝尖晶石 + 纳米粉体　； 参考：《东北大学学报(自然科学版)》2017年06期

【摘要】：以硝酸盐和蔗糖为原料,利用低温燃烧合成制备纳米镁铝尖晶石(MgAl_2O_4)粉体,研究了不同煅烧温度、气氛以及加热速率等因素对纳米MgAl_2O_4粉体特性的影响.结果表明:随着前驱体煅烧温度的升高,纳米MgAl_2O_4晶粒尺寸逐渐增大;在O2环境中煅烧前驱体可以降低纯MgAl_2O_4相的形成温度,促进反应物质扩散、增大晶粒尺寸.在快速升温、蔗糖与硝酸盐物质的量比为2∶1以及通入O2的条件下,在400℃下煅烧生成MgAl_2O_4相,700℃时得到单相MgAl_2O_4纳米粉体.低温燃烧合成制备纳米MgAl_2O_4粉体结晶度高、晶粒尺寸细小,呈松散的软团聚态,有利于降低MgAl_2O_4陶瓷致密化烧结温度.
[Abstract]:Nanocrystalline MgAl2O4 powders were prepared from nitrates and sucrose by combustion synthesis at low temperature. The effects of calcination temperature, atmosphere and heating rate on the properties of nano-MgAl2O4 powders were studied. The results show that with the increase of calcination temperature of precursor, the grain size of nanometer MgAl_2O_4 increases gradually, and calcined precursor in O2 environment can decrease the formation temperature of pure MgAl_2O_4 phase, promote the diffusion of reactants and increase the grain size. Under the condition of rapid heating, the ratio of sucrose to nitrate is 2:1 and O _ 2 is passed through, the single-phase MgAl_2O_4 nano-powders can be obtained by calcination at 400 鈩，

本文编号：1885126