The mechanism of crystallization from a B2O3-containing glass, with composition based in the CaO–MgO–Al2O3–SiO2 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 lm, immersed in a residual glassy phase.
2006 Elsevier B.V. All rights reserved.
PAC
The mechanism of crystallization from a B2O3-containing glass, with composition based in the CaO–MgO–Al2O3–SiO2 system, to aglass–ceramic glaze was studied by different techniques. Glass powder pellets were fast heated, simulating current industrial tile processingmethods, at several temperatures from 700 to 1200 C with a 5 min hold. Microstructural study by field emission scanning electronmicroscopy revealed that a phase separation phenomenon occurred in the glass, which promoted the onset of mullite crystallization at900 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 longerthan 4 lm, immersed in a residual glassy phase. 2006 Elsevier B.V. All rights reserved.PAC
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