Abstract
Pressed compacts of an industrial spray-dried porcelain stoneware powder, consisting mainly of albite, quartz, kaolinite, and illite, were thermally treated at different temperatures and times. Fired test piece bulk density and water absorption, in addition to phase content (using X-ray diffraction (XRD) data and Rietveld refinements) and microstructure (using scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM–EDS)), were determined. The isothermal kinetics of densification, mullite precipitation, and feldspar and quartz dissolution were obtained. The evolution of the mullite, quartz, feldspar, and vitreous phase mass percentages with the dissolved feldspar fraction was independent of thermal treatment. The evolution of water absorption, linear shrinkage, and bulk density with vitreous phase content was also independent of thermal treatment. Water absorption decreased linearly as vitreous phase content increased, until it cancelled out at a vitreous phase content of 66% by weight.
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call