期刊
SCRIPTA MATERIALIA
卷 145, 期 -, 页码 118-121出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2017.10.023
关键词
Hydrothermal sintering; Ceramics; Nanocrystalline microstructure; Low-temperature water-assisted densification
We report the first successful densification of polycrystalline alpha-quartz. The innovative hydrothermal sintering process was used as a low temperature route on sol-gel silica nanoparticles (350 MPa, 300 degrees C, 90 min) in presence of water or aqueous sodium hydroxide solution (from 0.2 M up to 5 M). For the lowest NaOH concentrations, amorphous silica densification is observed, reaching a compactness of 86%. The basic physical-chemical mechanism proceeds through dissolution-precipitation. When NaOH concentration increases, the kinetics of dissolution are faster, nanoparticles totally dissolve and alpha-quartz is stabilized during precipitation. 98% dense alpha-quartz is obtained, the crystallite size increases with NaOH concentration. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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