硫酸钾熔盐法微硅粉制备莫来石晶须研究  

Study on Preparation of Mullite Whisker by Molten Method Utilizing Micro Silica Fume

作　　者：王涛[1] 铁生年[1] 汪长安[2] 

机构地区：[1]青海大学化工学院,西宁810016 [2]清华大学材料学院,北京100084

出　　处：《人工晶体学报》2014年第3期597-600,共4页Journal of Synthetic Crystals

基　　金：青海省科技项目(2011-G-204)

摘　　要：以微硅粉和Al2（SO4）3，为反应物料，硫酸钾为熔盐介质，分别在800oC、900℃、1000oC和1100℃下煅烧并保温1h，溶解、过滤、烘干后得到白色疏松状莫来石粉体。利用XRD和SEM对合成粉体进行物相分析和显微形貌观察。结果表明：1000℃为合成莫来石最佳温度，合成的莫来石晶须直径为0．1～0．8μm，长度为4—5μm。同时对莫来石晶须的形成机理进行了探讨。The mullite powders were prepared through reaction of micro silica fume and aluminum sulfate in molten potassium sulfate at different temperature of 800 ℃, 900 ℃, 1000 ℃ and 1100 ℃ for 1 h, sequently dissolved, separated and dried. The phase composition and morphology of synthesized powders were characterized by X-ray diffraction and scanning electron-microscopy. The results show that 1000 ℃ is regarded as the best synthesis temperature, and the mullite whiskers are 0.14）. 8μm in diameter and 4-5 μm in length. Meanwhile, the formation mechanism of the mullite whiskers was discussed.

关 键 词：微硅粉 熔盐 莫来石晶须 

分 类 号：O784[理学—晶体学]