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RESEARCH PRODUCT
Mechanism of crystallization of fast fired mullite-based glass–ceramic glazes for floor-tiles
Francisco Jose TorresEsther Ruiz De SolaJavier Alarcónsubject
AcicularMaterials scienceGlass-ceramicRietveld refinementGlazeMineralogyMulliteCondensed Matter PhysicsMicrostructureElectronic Optical and Magnetic MaterialsCeramic glazelaw.inventionlawMaterials ChemistryCeramics and CompositesComposite materialCrystallizationdescription
Abstract The mechanism of crystallization from a B 2 O 3 -containing glass, with composition based in the CaO–MgO–Al 2 O 3 –SiO 2 system, to a glass–ceramic glaze was studied by different techniques. Glass powder pellets were fast heated, simulating current industrial tile processing methods, at several temperatures from 700 to 1200 °C with a 5 min hold. Microstructural study by field emission scanning electron microscopy revealed that a phase separation phenomenon occurred in the glass, which promoted the onset of mullite crystallization at 900 °C. The amount of mullite in the glass heated between 1100 and 1200 °C was around 20 wt%, as determined by Rietveld refinement. The microstructure of the glass–ceramic glaze heated at 1160 °C consisted of interlocked, well-shaped, acicular mullite crystals longer than 4 μm, immersed in a residual glassy phase.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2006-07-01 | Journal of Non-Crystalline Solids |