MECHANICAL PROPERTY OF SILICA XEROGELS ESTIMATED BY MERCURY
Mercury cannot penetrate the pores, and the pressure increase induces an isostatic pressure on aerogels. According to this phenomenon, several authors have shown a new way to estimate the mechanical properties for brittle aerogels, based on a power law between the mechanical modulus and the bulk density. Two step acid-base catalyzed silica xerogels which had integrated structure were prepared through sol-gel and ambient pressure drying. Silica xerogels powder, TiO2 powder and short fibers were added as the additives in order to improve the mechanical properties of silica xerogels. The porous structure was estimated by the means of mercury intrusion porosimetry (MIP). Five exponent values with different additives were determined from MIP curves according to the theoretical model of R. Pirard. The results show that there is the coherence between microcosmic measure of MIP and macroscopical method of classical mechanical properties. The mechanical property of silica xerogels is increased by adding different additives.
Fei He Xiaodong He Mingwei Li
Center for Composite Materials, Harbin Institute of Technology, Harbin, China School of Material Science and Engineering, Harbin Institute of Technology, Harbin, China
国际会议
第九届工程结构完整性国际会议(The Ninth International Conference on Engineering Structural Integrity Assessment)
北京
英文
2007-10-15（万方平台首次上网日期，不代表论文的发表时间）