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微波辅助燃烧法是一种制备纳米无机功能材料的新技术。以硝酸镁、硝酸铝为原料,尿素为燃料,制备镁铝尖晶石(Mg Al_2O_4)细粉。并且通过X射线衍射分析(XRD)、扫描电镜(SEM)、激光粒度分析等表征手段研究了微波输出功率以及烧结温度对于产物结构形貌的影响。微波整体加热的特点使得溶液发生剧烈燃烧反应,并能在短时间内释放出大量的能量和气体,利于提高粉体的分散性,促使了超细颗粒的形成。微波功率的递增有利于晶粒的生长。在微波输出功率为640 W时,可制备结晶度高的Mg Al_2O_4粉体。烧结促进镁铝尖晶石晶粒的生长,当烧结温度为1500℃时,晶体生长较完整,有明显的八面体结构。
Microwave assisted combustion is a new technology for preparing nano inorganic functional materials. Magnesium nitrate, aluminum nitrate as raw materials, urea fuel, prepared MgAl 2 O 4 fine powder. The effects of microwave output power and sintering temperature on the morphology of the product were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and laser particle size analysis. The overall heating of the microwave makes the solution undergo violent combustion reaction and can release a large amount of energy and gas in a short time, which helps to improve the dispersibility of the powder and promote the formation of ultrafine particles. Increasing microwave power is conducive to the growth of grains. When the output power of microwave is 640 W, Mg Al 2 O 4 powder with high crystallinity can be prepared. Sintering promotes the growth of Mg-Al spinel grains. When the sintering temperature is 1500 ℃, the crystal grows more intact with obvious octahedral structure.