Mechanism of crystallization of fast fired mullite-based glass–ceramic glazes for floor-tiles

The mechanism of crystallization from a B 2O 3-containing glass, with composition based in the CaO–MgO–Al 2O 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 temperat...

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Bibliographic Details
Published in:Journal of non-crystalline solids 2006-07, Vol.352 (21), p.2159-2165
Main Authors: Torres, Francisco Jose, Ruiz de Sola, Esther, Alarcón, Javier
Format: Article
Language:English
Subjects:
Aluminosilicates
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Ceramic tiles
Chemical industry and chemicals
Exact sciences and technology
Glass–ceramics
Heavyclay products, whiteware
Microstructure
X-ray diffraction
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Summary:The mechanism of crystallization from a B 2O 3-containing glass, with composition based in the CaO–MgO–Al 2O 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.
ISSN:0022-3093
1873-4812
DOI:10.1016/j.jnoncrysol.2006.01.038