Low Temperature Synthesis of Magnesium Aluminate Spinel from AlOOH and MgO powder
Ultrafine MgAl2O4 powders have been successfully synthesized by solid-state reaction from the mixture of AlOOH and MgO at the lower temperature. The samples were investigated by DTA/TG、XRD and SEM analyses. The results showed that AlOOH can be decomposed into γ-Al2O3 from DG/TDA curves, which can improve the activity of Al2O3 and promote the process of solid-state reaction. The XRD analysis showed the single-phase MgAl2O4 was formed at 1400℃. Meanwhile it was detected by ICP-MS that the purity of powders was 99.995％. The SEM images showed that the mineralizer containing fluoride such as AlF3, NH4F can promote the resultant to grow into regular octahedrons and disperse the particles. The XRD analysis indicated the mixture containing 5％ AlF3 can transform the integrated MgAl2O4 powders at 1200℃, nearly 200℃ lower than general solid-state reaction. Furthermore, The SEM images showed that fluoride can crystal the fine particles into the larger MgAl2O4 crystals, about 0.5～1.5μm.
low temperature solid-state reaction MgAl2O4 crystal ultrafine powders high purity mineralizer
Wang Xiuhui Lu Shengbo Wang Chengmin Yu Hongbo
Liaoning Key Laboratory for fabrication and Application of Super-fine Inorganic Powders, Dalian Jiaotong University, Dalian, Liaoning, 116028, China
国际会议
青岛
英文
1811-1814
2009-10-09（万方平台首次上网日期，不代表论文的发表时间）