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总结了关于热处理气氛对于应用溶胶-凝胶柠檬酸法合成纳米级镁铝尖晶石粉末的影响。以BET特定表面积测量方法、晶粒尺寸、同步热分析以及微观观察为基础,在对先驱物进行热处理时使用氩气气氛会明显的减小合成陶瓷粉末的晶粒尺寸。与空气气氛中进行的热处理相比,在柠檬酸中残留的含碳材料在阻碍颗粒烧结方面发挥了很重要的作用。在氩气气氛下进行缓慢的加热为获得尺寸为5～7nm的纳米级镁铝尖晶石粉末提供了机会。本文所述的新方法经氩气处理利用溶胶-凝胶柠檬酸法合成尺寸在20～100nm的纳米级镁铝尖晶石粉末会遇到突然加热的问题。
The effects of heat treatment atmosphere on the synthesis of nano-scale Mg-Al spinel powder by sol-gel citric acid method are summarized. Based on BET specific surface area measurements, grain size, simultaneous thermal analysis, and microscopic observations, the use of an argon atmosphere in the heat treatment of the precursor significantly reduces the grain size of the synthetic ceramic powder. The carbonaceous material remaining in the citric acid plays an important role in hindering the sintering of the particles compared to the heat treatment in the air atmosphere. Slow heating in an argon atmosphere offers the opportunity to obtain nanoscale magnesium aluminum spinel powder with a size of 5 to 7 nm. The new method described herein solves the problem of sudden heating by the sol-gel citric acid synthesis of nano-sized magnesium aluminum spinel powder with a size of 20-100 nm by argon treatment.