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材料工程  2015 

微沸法合成纳米莫来石及活化能的研究

DOI: 10.11868/j.issn.1001-4381.2015.06.005, PP. 26-30

Keywords: 微沸法,纳米莫来石,活化能

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Abstract:

以硝酸铝和硅溶胶为原料,采用微沸法对合成纳米莫来石及其活化能进行研究,并用热重-差示扫描热量计(TG-DSC)、X射线衍射仪(XRD)和扫描电子显微镜(SEM)对合成莫来石的粒度、相组成和形貌进行分析。结果表明在原料中的铝硅摩尔比为31的条件下,温度为854℃时莫来石开始形成,温度为920℃时Al-Si尖晶石开始转变为莫来石,温度为1200℃时莫来石化完成,合成莫来石的活化能为(634.52±28.90)kJ·mol-1。经过1200℃煅烧后,莫来石含Al2O3的摩尔分数为59.8%,平均粒度约为31.7nm,形状为针状,并由这些针状莫来石构成连续的网络结构。随着铝硅摩尔比的增加,合成莫来石的温度降低,活化能降低。当铝硅摩尔比增加至61,合成莫来石的活化能降至(514.73±14.40)kJ·mol-1。

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