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.
Nanocrystalline magnesium aluminate spinel （MgAl2 O4） powders were prepared by a low temperature combustion synthesis method using nitrates and sucrose as starting materials, the characteristics of the as-synthesized powders were investigated in terms of heating temperature, environmental atmosphere and heating rate. The results show that particle sizes of MgAl2O4 spinel powder increase with the heating temperature of polymer precursors. When the precursors are heated in O2 atmosphere, the reduced formation temperature of pure MgAl2 O4 phase and accelerated reactive species diffusion along with enlarged particle sizes can be achieved. Under the conditions of fast heating,2：1 molar ratio of sucrose to nitrates and O2 atmosphere, the formation temperature of MgAl2O4 phase is at 400 t and further pure single phase is obtained at 700 t . The highly crystalline, soft agglomerated nano-sized MgAl2O4 powders are in favor of decreasing sintering temperature of high dense MgAl2O4 ceramics.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2017年第6期814-818,共5页
Journal of Northeastern University(Natural Science)
基金
国家自然科学基金资助项目(61372014)
关键词
镁铝尖晶石
纳米粉体
低温合成
固相燃烧
蔗糖
magnesium aluminate spinel
nanocrystalline powder
low temperature synthesis
solid state combustion
sucrose
