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以碱式碳酸镁和金属铝粉为原料,Ni(OH)2为添加剂,采用X射线衍射和差示扫描量热分析,以及拉曼光谱、高分辨透射电镜研究了纳米晶MgAl2O4-C复合粉体的机械合金化法制备。结果表明:采用机械合金化的方法,经过15 h的研磨后可直接制备高度分散的纳米晶尖晶石-碳复合粉体;随着研磨时间的延长,尖晶石及碳的生成量增多,碳的石墨化程度有所改善,研磨50h后,金属铝和碱式碳酸镁之间反应基本完成;Ni(OH)2的加入可加快体系的反应进程,促进尖晶石的形成,同时对反应体系中产物碳的石墨化具有明显促进作用。
Using Ni (OH) 2 as additive and basic magnesium carbonate and aluminum powder as raw materials, the properties of nanocrystalline MgAl2O4-C composite powder were investigated by X-ray diffraction and differential scanning calorimetry, Raman spectroscopy and high resolution transmission electron microscopy The body of the mechanical alloying method. The results show that spinel and carbon can be directly prepared by mechanical alloying after 15 h grinding. With the increase of milling time, the amount of spinel and carbon increases, The graphitization degree of carbon has been improved. After milling for 50h, the reaction between metallic aluminum and basic magnesium carbonate is basically completed. The addition of Ni (OH) 2 accelerates the reaction process of the system and promotes the formation of spinel. Meanwhile, The graphitization of the product carbon in the system has obvious promotion effect.