Toward hard and highly crack resistant magnesium aluminosilicate glasses and transparent glass-ceramics

X.F. Ke, Z:T. Shan, Z.H. Li, Y.H. Tao, Yuanzheng Yue, H.Z. Tao*

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Abstrakt

High hardness and high crack resistance are usually mutually exclusive in glass materials. Through the aerodynamic levitation and laser melting technique, we prepared a series of magnesium aluminosilicate glasses with a constant MgO content, and found a striking enhancement of both hardness and crack resistance with increasing Al2O3. The crack resistance of the magnesium aluminosilicate glass is about five times higher than that of the binary alumina-silica glass for the similar [Al]/([Al] + [Si]) molar ratio (around 0.6). For the selected magnesium aluminosilicate glass with R = 0.32, when subjected to isothermal treatment at 1283K, we observed a further drastic enhancement of both hardness and crack resistance by extending the heating time. Based on the structural analyses, we propose an atomic-scale model to explain the mechanism of synergetic enhancement in hardness and crack resistance for the magnesium aluminosilicate glasses and glass-ceramics.

OriginalsprogEngelsk
TidsskriftJournal of the American Ceramic Society
Vol/bind103
Udgave nummer6
Sider (fra-til)3600-3609
Antal sider10
ISSN0002-7820
DOI
StatusUdgivet - 1 jun. 2020

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