摘要
以正硅酸乙酯为先驱体，乙醇为溶剂，用溶胶-凝胶法在Al2O3基体上制备了SiO2无机膜，就pH、化学添加剂、热处理过程中升温速率、正硅酸乙酯和乙醇的摩尔比对无机膜质量的影响进行了研究。结果表明，pH影响正硅酸乙酯的聚合速度，从而直接关系到膜层的质量，pH为1．8时，凝胶时间最长；加入化学添加剂N，N-二甲基甲酰胺能够防止膜层龟裂；在后续加热过程中，升温速率是影响膜层质量的主要因素，控制升温速率应该分为两个阶段，在210℃之前应控制升温速率在0.5℃／min，在210～600℃应控制在1℃／min；正硅酸乙酯和乙醇的摩尔比为1：6．08时的涂膜周期比1：13．64时的涂膜周期短。
Silicon dioxide inorganic membranes on a1203 matrix were prepared by Sol - Gel method using tetraethoxysilane （TEOS） as precursor and ethanol as the solvent. The effects of pH, chemical additives, heat treatment rate of temperature increase and the mole ratio of TEOS to ethanol on the quality of inorganic membranes were investigated. The results show that pH can affect the polymerization rate of TEOS, accordingly relate the quality of film directly. The gelation time is the longest when pH is 1.8. Adding chemical additive N, N - dimethylformamide can prevent the film to chap. The rate of temperature increase during the heat treatment process is the main factor of film quality. Controlling the rate of temperature increase should be divide into two stages. It is controlled at 0.5 ℃/min before 210 ℃ , and 1 ℃/min from 210 ℃to 600 ℃. When the mole ratio of TEOS to ethanol is 1：6.08, the film coating period is shorter than that of 1 ： 13.64.
出处
《辽宁石油化工大学学报》
CAS
2006年第2期19-22,共4页
Journal of Liaoning Petrochemical University
关键词
溶胶-凝胶法
制备
二氧化硅
无机膜
Sol- Gel method
Preparation
Silicon dioxide
Inorganic membranes
