Crystallization kinetics of calcium aluminate glasses studied by non-isothermal techniques

Yanhang Wang; Chengkui Zu; Kun He; Huifeng Zhao; Bin Han; Jiang Chen

doi:10.1007/s11595-013-0791-5

Journal of Wuhan University of Technology Materials Science Edition ›› 2013, Vol. 28 ›› Issue (5) : 907 -911. DOI: 10.1007/s11595-013-0791-5

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Crystallization kinetics of calcium aluminate glasses studied by non-isothermal techniques

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Abstract

The crystallization kinetics of 38.0CaO-38.0Al₂O₃-10.5BaO-6.5MgO-6.0Y₂O₃-1.0(Na₂O+K₂O) (wt%) glass was studied by differential scanning calorimeter (DSC) and X-ray diffraction (XRD) techniques. The results showed that DSC curves of calcium aluminate glass have a single glass transition temperature followed by one crystallization peak for the heating rates β = 5 K/min and two crystallization temperatures T _p1 and T _p2 for β ≥ 10 K/min. The activation energies of crystallization obtained from the Gao-Wang model of the first exothermal peak and the second exothermal peak of calcium aluminate glass are 340 and 662 kJ/mol, respectively. The Avrami exponents of the both crystallization peaks are approximately 2, indicating the twodimensional crystalline growth during its transformation from amorphous to crystalline. Ca₁₂Al₁₄O₃₃, Ca₃Al₂O₆ and unknown crystalline phases firstly appear when calcium aluminate glass is heat-treated. With the extending of heat-treatment duration, BaAl₂O₄ phase comes out.

Keywords

calcium aluminate glass / glass-ceramic / crystallization / calorimetry

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Yanhang Wang, Chengkui Zu, Kun He, Huifeng Zhao, Bin Han, Jiang Chen. Crystallization kinetics of calcium aluminate glasses studied by non-isothermal techniques. Journal of Wuhan University of Technology Materials Science Edition, 2013, 28(5): 907-911 DOI:10.1007/s11595-013-0791-5

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