标题：Low-temperature combustion synthesis and sintering properties of MgAl2O4 powders
作者：Bai, Jia-Hai ;Liu, Jun-Cheng
作者机构：[Bai, Jia-Hai ;Liu, Jun-Cheng ] School of Materials Science and Engineering, Shandong University of Technology, Zibo 255049, China
来源：Rengong Jingti Xuebao/Journal of Synthetic Crystals
摘要：Nano-sized MgAl2O4 powders were synthesized via a low-temperature combustion process using urea, glycine and starch as fuel, and the effects of NH4NO3 (as an oxidizer) addition on combustion process, characteristics and sinterability of MgAl2O4 powders were also investigated. The microstructure and phase composition of MgAl2O4 powders were characterized by XRD and SEM, respectively. The experimental results reveal that as the NH4NO3 addition increasing, the combustion type transforms from flamless combustion to flaming combustion, the flaming combustion time increases significantly, ignition loss of the combustion products decreases remarkably, and the crystallite size of MgAl2O4 powders enlarges markedly. On the other hand, the sinterability of MgAl2O4 powders firstly increases significantly and then decreases as the NH4NO3 addition increasing. The MgAl2O4 powder synthesized from the precursor with the NH4NO3/(Al(NO3)3 + Mg(NO3)2) molar ratio of 0.04/0.15 exhibits higher sinterability as compared with other powders and the ceramics from the powder has a relative density as high as 98%.