本文選題：鎂鋁尖晶石 + 納米粉體�。� 參考：《東北大學(xué)學(xué)報(自然科學(xué)版)》2017年06期

【摘要】：以硝酸鹽和蔗糖為原料,利用低溫燃燒合成制備納米鎂鋁尖晶石(MgAl_2O_4)粉體,研究了不同煅燒溫度、氣氛以及加熱速率等因素對納米MgAl_2O_4粉體特性的影響.結(jié)果表明:隨著前驅(qū)體煅燒溫度的升高,納米MgAl_2O_4晶粒尺寸逐漸增大;在O2環(huán)境中煅燒前驅(qū)體可以降低純MgAl_2O_4相的形成溫度,促進(jìn)反應(yīng)物質(zhì)擴(kuò)散、增大晶粒尺寸.在快速升溫、蔗糖與硝酸鹽物質(zhì)的量比為2∶1以及通入O2的條件下,在400℃下煅燒生成MgAl_2O_4相,700℃時得到單相MgAl_2O_4納米粉體.低溫燃燒合成制備納米MgAl_2O_4粉體結(jié)晶度高、晶粒尺寸細(xì)小,呈松散的軟團(tuán)聚態(tài),有利于降低MgAl_2O_4陶瓷致密化燒結(jié)溫度.
[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，

本文編號：1885126