Structure and leaching property of Al-doped zirconolite-based glass-ceramics

被引：0
作者：
Wu L. [1 ]
Li H. [1 ]
Wang X. [1 ]
Teng Y. [1 ]
Li Y. [1 ]
机构：
[1] State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang, 621010, Sichuan
来源：
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2016年 / 44卷 / 03期
关键词：
Alumica; Barium borosilicate glass; Glass-ceramics; Zirconolite;
D O I：
10.14062/j.issn.0454-5648.2016.03.16
中图分类号：
学科分类号：
摘要：
Zirconolite-based barium borosilicate glass-ceramics were prepared by a melting-heat treatment method. The effect of Al2O3 content on the glass network former, crystalline phases and microstructure of barium borosilicate glass-ceramics was investigated. The leaching properties of glass-ceramics were also analyzed by the product consistency test (PCT). The results show that the more Al3+ ions combine with free oxygen to form [AlO4] in the glass network when the concentration of aluminum increases, leading to the decrease of [BO4] and the increase of [BO3]. Only zirconolite and titanite crystalline phases form in the glass-ceramic without Al2O3. Calcium titanate phase appears in the glass-ceramic with Al2O3 of 2% (in mass fraction), and calcium titanate phase increases with the increase of concentration of aluminum. When the content of Al2O3 increases to 6%, titanite crystalline phase disappear mostly, only strip-shape CaZrTi2O7 and cubic CaTiO3 exist in the glass-ceramics. According tp the PCT experimental results, the addition of Al2O3 has a slight influence on the leaching properties of glass-ceramics. The normalized leaching rates of B and Ca in glass-ceramics are the same order of magnitude of borosilicate glass waste (i.e., 10-3 g/(m2·d)), and the normalized leaching rate of Nd (about 10-6 g/(m2·d)) is one order of magnitude lower than that of borosilicate glass waste. © 2016, Chinese Ceramic Society. All right reserved.
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页码：444 / 449
页数：5
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