Glass-ceramic samples, having composition of SiO2-35,
CaO-45, Na2O-10 and P2O5-10 in weight ratio
were prepared through sintering route. Glass powder was reinforced by Al
powder. The strength of glass-ceramic composite was found to be temperature
dependent, and it varies with the addition of Al powder. Flexural strength
increases with the increase of powder addition and sintering temperature,
however, decreases with the increase of sintering time. There is an optimum
temperature (>1100℃) above which flexural strength of all samples
decreases. Bulk density changes to a higher value as the addition of Al-powder
increases up to 3% by weight above which density decreases slowly. On the other
hand, apparent porosity and water absorption decrease with the increase of
percentage of Al powder added. Porosity and water absorption also showed a
dependent characteristic on sintering time and sintering temperature.
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