The effect of Cr2O3 as a nucleating agent in iron-rich glass-ceramics |
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| Affiliation: | 1. UNESP – Univ Estadual Paulista, Departamento de Física, 13506-900 Rio Claro, SP, Brazil;2. UFGD – Univ Federal da Grande Dourados, Faculdade de Ciências Exatas e Tecnologias, 79804-970 Dourados, MS, Brazil;3. UFSC – Univ Federal de Santa Catarina, Centro de Ciências da Educação, 88010-970 Florianópolis, SC, Brazil;4. USP – Univ de São Paulo, Instituto de Física de São Carlos, 13566-590 São Carlos, SP, Brazil;1. Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, UNIST-NUIST Research Center of Environment and Energy, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, PR China;2. Datang Nanjing Environmental Protection Technology Co., Ltd, Nanjing, 21111, PR China;1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China;2. Key Laboratory of Space Applied Physics and Chemistry, Northwestern Polytechnical University, Xi’an, 710072, China;1. Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, PR China;2. Datang Nanjng Environmental Protection Technology Co, Ltd, Nanjing 21111, PR China;3. School of Chemical and Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China |
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| Abstract: | In this work, the effect of Cr2O3 as a nucleating agent, in iron rich glasses has been investigated by means of DTA, XRD and density measurements. By Cr2O3 addition, from 0·4 to 1·0 wt%, a lowering of the crystallisation peak temperature resulted in the DTA trace, the maximum effect corresponding to 0·7 wt%. By evaluating the degree of crystallisation of the glass at 0·7 wt% Cr2O3, the highest efficiency in the nucleation process also corresponds. The optimum values for the nucleation and crystallisation time and temperature, determined for 0·7 wt% Cr2O3 addition, have been 70 min at 630°C and 30 min at 800°C. The crystalline phases formed at different thermal treatment temperatures of the parent glass have been investigated by XRD; the spinel is the only phase after the nucleation; pyroxene is the major phase after the crystallisation. The results of this study have highlighted that a small percentage of Cr2O3 strongly affects the spinel formation thereby reducing the time and temperature of the thermal treatment and enhancing the degree of crystallisation of high iron content glasses. © |
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