The effect of BaO and Al2O3 addition on the crystallization behaviour of cordierite glass ceramics in the presence of V2O5 nucleant
The effect of BaO and Al2O3 addition on the crystallization behaviour of cordierite glass ceramics in the presence of V2O5 nucleant
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DOI：
10.1016/j.jeurceramsoc.2008.05.026
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发表时间：
2009
影响因子：
5.7
通讯作者：
V. Marghussian;U. Balazadegan;B. Eftekhari-yekta
中科院分区：
文献类型：
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作者：
V. Marghussian;U. Balazadegan;B. Eftekhari-yekta
采用差热分析、X射线衍射仪和扫描电子显微镜研究了在不同BaO和Al_2O_3添加剂存在下，V_2O_5成核剂对化学计量比堇青石微晶玻璃析晶的影响。结果表明，3wt.%V2O5和1.5wt.%BaO是诱导上述微晶玻璃表面析晶和块体析晶的最佳添加量。当Al_2O_3含量超过化学计量比的4~5wt%时，在1045~1055℃的温度范围内，与堇青石一起形成莫来石，而在Al_2O_3含量为6wt.%的样品中，唯一的结晶产物是莫来石。
The effect of V2O5nucleant on crystallization of stoichiometric cordierite glass ceramics in the presence of various amounts of BaO and Al2O3additives were investigated by DTA, XRD and SEM. It was shown that 3wt.% V2O5and 1.5wt.% BaO were the optimum amounts of the additives effective in inducing both surface and bulk crystallization in the above glass ceramics. This resulted in ∼90wt.% cordierite after a 3h heat treatment at 1020°C. The specimens possessing 4–5wt.% Al2O3in excess of the stoichiometric cordierite composition, developed mullite along with cordierite in the temperature range of 1045–1055°C, whereas in the specimen containing 6wt.% excess Al2O3, mullite was detected as the sole crystallization product.