MgO/Al2O3比对MgO-Al2O3-SiO2系统玻璃分相与析晶的影响

doi:10.11896/j.issn.1005-023X.2018.24.008

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Abstract Cordierite-based glass-ceramics with diverse MgO/Al₂O₃ ratios were prepared by high temperature melting met-hod. The impact of MgO/Al₂O₃ ratio on the phase separation and crystallization behavior of the MgO-Al₂O₃-SiO₂ glass were investigated by means of differential thermal analyzer (DTA), X-ray diffraction (XRD) and scanning electron microscope (SEM). The results indicated that with the constant content of SiO₂, the decrease of MgO/Al₂O₃ ratios leaded to the morphology change of phase separation droplets from worm-like shape to isolated sphere,and the gradual size reduce of phase separation droplets from 200—300 nm to 30—50 nm. The increase of crystallization peak temperature (T_p) from 997 ℃ to 1 105 ℃could be observed as the MgO/Al₂O₃ ratio decreased from 3 to 1, which made the crystallization become more difficult. When the MgO/Al₂O₃ ratio is 3, the MgO-Al₂O₃-SiO₂ glass would produce a large amount of phase separation droplets after heat treatment at 950 ℃. After heat treatment at 1 050 ℃, substantial cordierite crystals were precipitated in phase separation droplets, which were preferentially precipitated in Mg-rich phase. Increasing MgO/Al₂O₃ ratio was highly beneficial to the phase separation and crystallization in MgO-Al₂O₃-SiO₂ glass. Conversely, reducing the MgO/Al₂O₃ ratio would weaken the the ability of phase separation and crystallization of the glass.

Key words： MgO/Al₂O₃ ratio phase-separation crystallization cordierite

Published: 23 January 2019

CLC number:

TQ171.73

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	Articles by authors
	BAO Zhenhong
	JIANG Weihui
	MIAO Lifeng
	LUO Wei

Cite this article:

BAO Zhenhong,JIANG Weihui,MIAO Lifeng, et al. Effect of MgO/Al₂O₃ Ratio on Phase-separation and Crystallization of MgO-Al₂O₃-SiO₂ Glass[J]. Materials Reports, 2018, 32(24): 4253-4257.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.24.008 OR http://www.mater-rep.com/EN/Y2018/V32/I24/4253

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