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首页> 外文期刊>European Journal of Glass Science and Technology, PartB. Physics and Chemistry of Glasses >Crystallization kinetics of borosilicate glasses for CHROMPIC nuclear waste vitrification
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Crystallization kinetics of borosilicate glasses for CHROMPIC nuclear waste vitrification

机译：用于CHROMPIC核废料玻璃化的硼硅酸盐玻璃的结晶动力学

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摘要

Borosilicate glasses used for vitrification of CHROMPIC radioactive waste into a boroaluminosilicate glass matrix are considered. The composition dependence of the crystallisation kinetics of glasses with chemical composition close to that currently used for CHROMPIC vitrification was studied. Pairs of glass samples were studied in which the amount (in wt%) of each of the seven components were increased and decreased as follows: (3.5 +/- 3.5)Li2O, (9.0 +/- 5.0)Na2O, (14.5 +/- 3.5) B2O3, (5.5 +/- 5.5)Al2O3, (5.5 +/- 5.5)TiO2, (4.5 +/- 4.5)Fe2O3, (57.5 +/- 5.5)SiO2. A crystallisation peak was observed for only five glasses, and a crystallisation kinetics analysis could only be performed for these glasses. The crystallisation kinetics were studied by DTA at constant heating rates of 2.5, 5.0, 7.5, 10.0, 12.5, and 15.0 degrees C/min. The kinetic parameters of crystallisation were calculated by a model-fitting approach, using the Johnson-Mehl-Avrami-Kolmogorov kinetic model and a nonlinear least squares method. It was found that decreasing the content of network modifying alkaline oxides, Li2O, and Na2O, as well as increasing the content of network forming oxides, Al2O3, and TiO2, increases the tendency of the glass to crystallise.
机译：考虑了用于将CHROMPIC放射性废物玻璃化为硼铝硅酸盐玻璃基体的硼硅酸盐玻璃。研究了化学组成与目前用于CHROMPIC玻璃化的化学成分接近的玻璃的结晶动力学的成分依赖性。研究了成对的玻璃样品，其中七个成分中的每一个的含量（以重量％计）按以下方式增加和减少：（3.5 +/- 3.5）Li2O，（9.0 +/- 5.0）Na2O，（14.5 + / -3.5）B2O3，（5.5 +/- 5.5）Al2O3，（5.5 +/- 5.5）TiO2，（4.5 +/- 4.5）Fe2O3，（57.5 +/- 5.5）SiO2。仅对五个玻璃观察到结晶峰，并且只能对这些玻璃进行结晶动力学分析。通过DTA在2.5、5.0、7.5、10.0、12.5和15.0℃/ min的恒定加热速率下研究结晶动力学。使用Johnson-Mehl-Avrami-Kolmogorov动力学模型和非线性最小二乘法，通过模型拟合方法计算结晶的动力学参数。发现减少网络改性碱性氧化物，Li 2 O和Na 2 O的含量，以及增加网络形成氧化物，Al 2 O 3和TiO 2的含量，增加了玻璃结晶的趋势。

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