硫酸钠熔盐法微硅粉制备莫来石晶须  

Preparation of Mullite Whiskers Using Waste Silica Fume in Sodium Sulfate Flux

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,青海西宁810016 [2]清华大学材料学院,北京100084

出　　处：《材料科学与工程学报》2014年第3期389-392,共4页Journal of Materials Science and Engineering

基　　金：青海省科技资助项目(2011-G-204)

摘　　要：以微硅粉和Al2(SO4)3为反应原料,硫酸钠为反应介质,反应混料分别在800℃、900℃、1000℃和1100℃下煅烧保温1h后,经溶解、过滤、烘干后得到莫来石晶须。利用XRD和FESEM对合成粉体进行物相分析和显微形貌观察,结果表明:1000℃为莫来石晶须最佳的合成温度,样品在经NaOH溶液碱处理后得到的莫来石晶须长度约为3~4μm,直径约为10~30nm。同时对合成莫来石晶须形成机理进行了探讨。Mullite whiskers have been prepared by reactions of silica fume with aluminum sulfate in molten sodium sulfate at temperatures of 800,900,1000and 1100℃for 1h,followed by dissolving,filtering, and drying.Phase composition and morphology of samples were characterized by X-ray diffraction and FieldEmission Scanning Electron Microscopy.Results indicated that 1000℃ is the best reaction temperature to produce mullite whiskers.The mullite whiskers after treated in sodium hydroxide solution were 3-4μm in diameter and 10-30μm in length.The process of formation of the mullite whiskers was also discussed based on all observation and findings above.

关 键 词：微硅粉 硫酸钠熔盐 莫来石晶须 

分 类 号：TQ175.712.1[化学工程—硅酸盐工业]