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Journal of Applied Sciences
  Year: 2009 | Volume: 9 | Issue: 16 | Page No.: 2981-2986
DOI: 10.3923/jas.2009.2981.2986
Effect of Different Concentrations of Titanium Oxide (TiO2) on the Crystallization Behavior of Li2O-Al2O3-SiO2 Glasses Prepared from Local Raw Materials
Omar A. Al-Harbi, Esmat M.A. Hamzawy and M. Mujtaba Khan

Abstract:
Lithium Aluminum Silicate (LAS) glasses produced from local raw materials (white silica sand and clay) and Li2CO3 were nucleated by different concentrations of TiO2 to transform into glass-ceramics. Studies were performed using Differential Thermal Analysis (DTA), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Dilatometer. Addition of TiO2 affected phase evolution, morphology and formation of β-spodumene along with brookite and Al2TiO5 phases. The SEM micrographs of the heat-treated glass samples also reflected bulk crystallization. However, softness of crystal edges took place on samples subjected to muliti-stage heat-treatment. This may attributed to partial melting of the pre-developed phases. The CTE values were low to medium with the formation of β-spodumene and brookite, but were high with the formation of Al2TiO5 and amorphous phasesin addition to both the β-spodumene and brookite phases. The values of low, medium and high Coefficient of Thermal Expansion (CTE) ranged between 3.02-49.672x10-7 °C-1 in the double and -2.171-31.737x10-7 °C-1 in the multi-stage heat treatments with in a temperature range of 25-300°C.
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How to cite this article:

Omar A. Al-Harbi, Esmat M.A. Hamzawy and M. Mujtaba Khan, 2009. Effect of Different Concentrations of Titanium Oxide (TiO2) on the Crystallization Behavior of Li2O-Al2O3-SiO2 Glasses Prepared from Local Raw Materials. Journal of Applied Sciences, 9: 2981-2986.

DOI: 10.3923/jas.2009.2981.2986

URL: https://scialert.net/abstract/?doi=jas.2009.2981.2986

 
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