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Issue 20, 2015
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Oriented crystallization of a β-Quartz Solid Solution from a MgO/Al2O3/SiO2 glass in contact with tetragonal ZrO2 ceramics

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Abstract

Model experiments concerning the nucleation of MgO/Al2O3/SiO2 glass are reported. A glass with the composition 22.5MgO·22.5Al2O3·55SiO2 (in mol%) is brought into contact with ceramic samples of tetragonal ZrO2 at a temperature of 1500 °C. This leads to a heavy corrosion of the ceramics and the diffusion of zirconia into the glass. Subsequent thermal treatments at 820/850 °C and 1050 °C provoke the formation of different phases at the glass/ceramic interface: monoclinic and tetragonal ZrO2, β-quartz solid solution (β-QSS), and spinel. At some distance from the ceramics, the only detected crystalline phase is the highly oriented β-QSS. Only mullite is observed at the air/glass interface where it also grows into the bulk. A sample directly crystallized at 1050 °C shows a very different behavior and only mullite is formed at both the air/glass as well as the glass/ceramic interface. The thermal treatment at the nucleation temperatures of 820/850 °C is thus essential for the precipitation of zirconia and β-QSS in the glass. X-ray diffraction, high resolution (scanning) transmission electron microscopy, and scanning electron microscopy including electron backscatter diffraction are performed to elucidate the underlying mechanisms.

Graphical abstract: Oriented crystallization of a β-Quartz Solid Solution from a MgO/Al2O3/SiO2 glass in contact with tetragonal ZrO2 ceramics

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Article information


Submitted
01 Dec 2014
Accepted
20 Jan 2015
First published
22 Jan 2015

This article is Open Access

RSC Adv., 2015,5, 15164-15171
Article type
Paper
Author version available

Oriented crystallization of a β-Quartz Solid Solution from a MgO/Al2O3/SiO2 glass in contact with tetragonal ZrO2 ceramics

S. Berndt, A. Gawronski, C. Patzig, W. Wisniewski, T. Höche and C. Rüssel, RSC Adv., 2015, 5, 15164
DOI: 10.1039/C4RA15584J

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