Effect of Bayan-Obo Tailings Content on Crystallization Characteristics and Properties of Glass-ceramics

被引：0

作者：

Song X. ^{[1
]}

Li Y. ^{[1
]}

Ren J. ^{[1
]}

Zhong Y. ^{[1
]}

Zhang H. ^{[1
]}

Ouyang S. ^{[1
]}

机构：

[1] School of Science, Inner Mongolia University of Science & Technology, Baotou

来源：

Zhang, Hongxia (46588582@qq.com) | 1600年 / Chinese Journal of Materials Research卷 / 34期

关键词：

Bayan-Obo tailings; Cr[!sub]2[!/sub]O[!sub]3[!/sub; Crystallization characteristics; Glass-ceramics; Inorganic non-metallic materials; Rare earth;

D O I：

10.11901/1005.3093.2019.472

中图分类号：

学科分类号：

摘要：

Metallic tailings built glass-ceramics were prepared with Bayan-Obo tailings as the main raw material and Cr2O3 as nucleating agent. The crystallization characteristics of tailings built glass-ceramics were characterized by means of DSC, XRD, SEM and Raman spectra and the properties of glass-ceramics were evaluated by bending strength, Vickers hardness and acid resistance tests. Results show that the glass-ceramics are mainly composed of crystalline phases of diopside and gehlenite, while the nucleating agent of Cr2O3 can promote the precipitation of the main crystalline phase of diopside by forming spinel. The mechanical and corrosion resistance characteristics of glass-ceramics showed a decreasing trend with the increase of tailings content. The higher CaO content caused by the increase of tailings content can lead to the obstruction of sliding and migration of crystalline phases in the crystal growth process. As a result, it was easy to produce cavities and defects in glass-ceramics. Meanwhile, the increase of the ratio of gehlenite/diopside was not conducive to the improvement of the properties of the glass-ceramics. In addition, the rare earth elements intergrowth in Bayan-Obo tailings can form the second phase of cerium calcium silica at the grain boundary, which can reduce the area and the total energy of grain boundaries, which was helpful to improve the mechanical and corrosion resistance of glass-ceramics. © All right reserved.

引用

页码：368 / 378

页数：10

共 27 条

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