摘要
以正硅酸乙酯为原料,利用溶胶-凝胶法在碳酸镁颗粒表面进行硅酸乙酯水解,生成的硅酸包敷在碳酸镁颗粒表面,然后进行干燥处理,在碳酸镁颗粒表面形成二氧化硅膜;采取正交实验研究了不同的条件对包敷效果的影响,对包敷后的碳酸镁表面进行了XRD分析.结果表明碳酸镁表面包敷了一层二氧化硅,包敷二氧化硅后的碳酸镁分解速度降低,包敷后的碳酸镁可以作为制备泡沫金属的发泡剂.
With the tetraethylorthosilicate （TEOS） used as starting material which was hydrolyzed on the surfaces of MgCO3 particles by sol-gol method, and the surfaces of MgCO3 particles were coated by the silicic acid thus formed. Then, silica films were formed on the surfaces of MgCO3 particles after heating-drying. Orthogonal tests were performed to investigate the influence of different conditions for TEOS hydrolysis on such a coating, and XRD was done to analyze the coated surfaces of MgCO3 particles. The results showed that the silica is really contained in the surface of MgCO3 particles, and the decomposition rate of coated MgCO3 particles lowers. As a result, the coated MgCO3 particles can be taken as a foaming agent to prepare foam metals.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第5期701-703,707,共4页
Journal of Northeastern University(Natural Science)
基金
国家自然科学基金资助项目(50704012)
关键词
正硅酸乙酯
水解
二氧化硅
碳酸镁
发泡剂
tetraethylorthosilicate （TEOS）
hydrolysis
silica
magnesium carbonate
foaming agent
