Abstract
The effect of V 2O 5 nucleant on crystallization of stoichiometric cordierite glass ceramics in the presence of various amounts of BaO and Al 2O 3 additives were investigated by DTA, XRD and SEM. It was shown that 3 wt.% V 2O 5 and 1.5 wt.% BaO were the optimum amounts of the additives effective in inducing both surface and bulk crystallization in the above glass ceramics. This resulted in ∼90 wt.% cordierite after a 3 h heat treatment at 1020 °C. The specimens possessing 4–5 wt.% Al 2O 3 in excess of the stoichiometric cordierite composition, developed mullite along with cordierite in the temperature range of 1045–1055 °C, whereas in the specimen containing 6 wt.% excess Al 2O 3, mullite was detected as the sole crystallization product.
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