稀土La<sub>2</sub>O<sub>3</sub>对尾矿微晶玻璃显微结构和裂纹扩展行为的影响

doi:10.11901/1005.3093.2017.225

材料研究学报

2018, Vol. 32

Issue (2): 97-104 DOI: 10.11901/1005.3093.2017.225

研究论文

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稀土La₂O₃对尾矿微晶玻璃显微结构和裂纹扩展行为的影响

杜永胜¹, 杨晓薇¹, 张红霞¹, 欧阳顺利², 李保卫²

1 内蒙古科技大学理学院包头 014010
2 内蒙古科技大学白云鄂博矿多金属资源综合利用重点实验室包头 014010

Effect of La₂O₃ on Microstructures and Crack Propagation of Tailing Glass-ceramics

Yongsheng DU¹, Xiaowei YANG¹, Hongxia ZHANG¹, Shunli OUYANG², Baowei LI²

1 College of Science, Inner Mongolia University of Science & Technology, Baotou 014010, China;
2 Key Laboratory of Integrated Exploitation of Bayan Obo Multi-metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China

引用本文:

杜永胜, 杨晓薇, 张红霞, 欧阳顺利, 李保卫. 稀土La₂O₃对尾矿微晶玻璃显微结构和裂纹扩展行为的影响[J]. 材料研究学报, 2018, 32(2): 97-104.
Yongsheng DU, Xiaowei YANG, Hongxia ZHANG, Shunli OUYANG, Baowei LI. Effect of La₂O₃ on Microstructures and Crack Propagation of Tailing Glass-ceramics[J]. Chinese Journal of Materials Research, 2018, 32(2): 97-104.

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摘要:

利用白云鄂博东尾矿和粉煤灰等固体废弃物为原料,采用传统熔融法制备CaO-Al₂O₃-MgO-SiO₂(CAMS)系尾矿微晶玻璃,通过XRD、DTA和拉曼光谱仪等手段表征La₂O₃对微晶玻璃析晶特性的影响,并对密度、抗折强度和维氏硬度进行了讨论。通过分析维氏压痕裂纹揭示La₂O₃对尾矿微晶玻璃显微结构和裂纹扩展行为的影响。结果表明,随着La₂O₃的添加微晶玻璃的析晶放热峰逐渐右移,析晶程度呈弱化趋势,但是其主晶相没有改变。La₂O₃的添加引起微晶玻璃内相关元素聚集,改变了微晶玻璃的显微结构。元素聚集抑制了微晶玻璃的裂纹扩展,进而提高了维氏硬度和抗折强度。

关键词 ：无机非金属材料, 微晶玻璃, 裂纹扩展, La₂O₃, 维氏硬度

Abstract：

Tailing glass-ceramics of quaternary CaO-Al₂O₃-MgO-SiO₂(CAMS) are prepared by traditional melting method with solid waste such as Bayan Obo east mine tailing and fly ash as main raw materials. The effect of La₂O₃on crystallization characteristics, microstructure, bending strength, Vickers hardness and crack propagation behavior of glass-ceramics are characterized by X-ray diffractometer (XRD), differential thermal analysis (DTA) measurement and Raman spectroscopy, bending tester and Vickers hardness tester. The results show that with the increase amount of La₂O₃, the crystallization temperature of the as-cast glasses shifts to higher temperature; the crystalline degree is gradually decreased but the main crystalline phase does not change. The addition of La₂O₃ leads to the aggregation of elements and the microstructure variation of glass-ceramics, which thereby suppress the crack propagation of glass-ceramics. As a result, the Vickers hardness and bending strength of glass-ceramics increased.

Key words： inorganic non-metallic materials glass-ceramics crack propagation La₂O₃ Vickers hardness

收稿日期: 2017-03-31

ZTFLH:

TB321

基金资助:国家自然科学基金(11564031),国家重点基础研究发展计划(2012CB722802),内蒙古自治区自然科学基金(2017MS0507)

作者简介:

作者简介杜永胜,男,1977年生,博士,副教授

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https://www.cjmr.org/CN/10.11901/1005.3093.2017.225 或 https://www.cjmr.org/CN/Y2018/V32/I2/97

图1 不同La2O3含量微晶玻璃的DTA曲线

图2 不同La2O3含量微晶玻璃的XRD图谱

图3 不同La2O3含量微晶玻璃的拉曼光谱

图4 不同La2O3含量微晶玻璃的SEM照片

图5 未腐蚀的La-1、La-2和La-6微晶玻璃的EDS图

图6 不同La2O3加入量微晶玻璃的维氏硬度

图7 不同La2O3加入量微晶玻璃维氏压痕形貌

图8 微晶玻璃密度和抗折强度与La2O3加入量的关系

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