CHARACTERIZATION OF THE SPINEL PHASE FROM SIO2-AL2O3 XEROGELS AND THE FORMATION PROCESS OF MULLITE
CHARACTERIZATION OF THE SPINEL PHASE FROM SIO2-AL2O3 XEROGELS AND THE FORMATION PROCESS OF MULLITE
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DOI：
10.1111/j.1151-2916.1986.tb07466.x
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发表时间：
1986-09-01
影响因子：
3.9
通讯作者：
OTSUKA, N
中科院分区：
文献类型：
--
作者：
OKADA, K;OTSUKA, N
以乙醇为溶剂，以正硅酸乙酯和非水合硝酸铝为原料，通过缓慢和快速的水解反应制备了两种干凝胶。慢速水解法制备的干凝胶在烧成时直接从非晶态晶化莫来石，而快速水解法制备的干凝胶在莫来石形成之前先晶化成尖晶石相。用各种方法表征了尖晶石相的组成，使其接近SiO_2·6Al_2O_3。讨论了莫来石的形成过程与原料结构的关系。
Two kinds of xerogels were prepared by the slow and rapid hydrolyses of tetraethoxysilane and aluminum nitrate nonahydrate dissolved in ethanol. Xerogels prepared by slow hydrolysis crystallized mullite directly from the amorphous state on firing whereas those formed by rapid hydrolysis crystallized a spinel phase before mullite formation. The composition of the spinel phase was characterized by various methods to be near SiO2·6Al2O3. The process of mullite formation is discussed in relation to the structures of the starting materials.