Microstructural Study on the Low Density SiO₂ Soot Body

Abstract:

Low density SiO₂ soot body, with a certain strength and porosity, is an intermediate of silica glass prepared by the indirect synthetic method. The microstructures of SiO₂ soot body have an important influence on the post-sintering process, such as micro-morphologies, pore structures and so on. These microstructures, including micro-morphologies, phase structure, hydroxyl structure, pore structure, pore size distribution and specific surface area, were studied by ESEM, XRD, FTIR, mercury intrusion method and nitrogen adsorption method. Experimental results indicate that, the low density SiO₂ soot body is composed of amorphous nano-SiO₂ particles with a particle diameter distribution of 100nm ~ 150nm. The pore structure of SiO₂ soot body tends to be irregular and the pore shape contains cross-linked holes, through-holes and blind holes. The pore size distribution is wide and involves macropore, mesopore and micropore.

• Periodical: Key Engineering Materials (Volume 726)
• Pages: 383-387
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.726.383
• Online since: January 2017
• Authors: Lan Jian Nie*, Ya Nan Jia, Lei Wang, Zai Kui Xiang, Fei Xiang Liu, Hui Wang
• Keywords: Indirect Synthetic Method, Low Density SiO₂ Soot Body, Mercury Intrusion Method, Microstructure, Nitrogen Adsorption Method

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