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

doi:10.11901/1005.3093.2017.225

Chinese Journal of Materials Research

2018, Vol. 32

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

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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

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Yongsheng DU, Xiaowei YANG, Hongxia ZHANG, Shunli OUYANG, Baowei LI. Effect of La₂O₃ on Microstructures and Crack Propagation of Tailing Glass-ceramics. Chinese Journal of Materials Research, 2018, 32(2): 97-104.

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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

Received: 31 March 2017

ZTFLH:

TB321

Fund: Supported by National Natural Science Foundation of China (No. 11564031) , National Basic Research Program of China (No. 2012CB722802) and Natural Science Foundation of Inner Mongolia (No. 2017MS0507)

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	Yongsheng DU
	Xiaowei YANG
	Hongxia ZHANG
	Shunli OUYANG
	Baowei LI

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.225 OR https://www.cjmr.org/EN/Y2018/V32/I2/97

Fig.1 DTA curves of the glass-ceramics with different contents of La₂O₃

Fig.2 XRD spectra of glass-ceramics with different contents of La₂O₃

Fig.3 Raman spectra of glass-ceramics with different contents of La₂O₃

Fig.4 SEM images of glass-ceramics with different contents of La₂O₃ (a) La-1,(b) La-2, (c) La-3, (d) La-4, (e) La-5, (f) La-6. Left: high magnification; right: low magnification

Fig.5 EDS images of unetched La-1 (a), La-2 (b) and (c) La-6 glass-ceramics

Fig.6 Vickers hardness of glass-ceramics with different La₂O₃ addition

Fig.7 Vickers indentation morphology of glass-ceramics with different La₂O₃ addition (a) La-1, (b) La-2, (c) La-3, (d) La-4, (e) La-5, (f) La-6

Fig.8 The density and bending strengths of glass-ceramics with different La₂O₃ additions

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