Low temperature hydrothermal sintering process for the quasi -complete densification of nanometric α-quartz
Language
en
Article de revue
This item was published in
Scripta Materialia. 2018-03, vol. 145, p. 118-121
Elsevier
English Abstract
We report the first successful densification of polycrystalline α-quartz. The innovative hydrothermal sintering process was used as a low temperature route on sol-gel silica nanoparticles (350 MPa, 300 °C, 90 min) in ...Read more >
We report the first successful densification of polycrystalline α-quartz. The innovative hydrothermal sintering process was used as a low temperature route on sol-gel silica nanoparticles (350 MPa, 300 °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 α-quartz is stabilized during precipitation. 98% dense α-quartz is obtained, the crystallite size increases with NaOH concentration.Read less <
Origin
Hal imported