Journal of Thermal Analysis and Calorimetry

, Volume 90, Issue 1, pp 185–189 | Cite as

Crystallization of spodumene-diopside in the las glass ceramics with CaO and MgO addition

Regular Papers Material Science/Kinetics/Geoscience
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Abstract

Crystallization, morphology and mechanical properties of a spodumene-diopside glass ceramics with adding different amount of CaO and MgO in Li2O-Al2O3-2SiO2 were investigated. With CaO and MgO addition, the crystallization temperature (T p) decreased, the value of Avrami constant (n) decreased from 3.2±0.3 to 1.4±0.2, the activation energy (E) increased from 299±3 kJ mol−1 to 537±5 kJ mol−1. The crystalline phases precipitated were h-quartz solid solution, β-spodumene and diopside. The mechanism of crystallization of the glass ceramics changed from bulk crystallization to surface crystallization. The grain sizes and thermal expansion coefficients increased while flexural strength and fracture toughness of the glass-ceramics increased first, and then decreased. The mechanical properties were correlated with crystallization and morphology of glass ceramics.

Keywords

crystallization glass glass-ceramics grain growth mechanical properties 
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Copyright information

© Springer Science+Business Media, LLC. 2007

Authors and Affiliations

  1. 1.School of Materials Science and Engineering, The State Key Laboratory of the Metal Matrix CompositesShanghai Jiaotong University200030P. R. China

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