Abstract
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.
Original language | English |
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Journal | Journal of the American Ceramic Society |
Volume | 103 |
Issue number | 6 |
Pages (from-to) | 3600-3609 |
Number of pages | 10 |
ISSN | 0002-7820 |
DOIs | |
Publication status | Published - 1 Jun 2020 |
Keywords
- aluminosilicates
- crack growth resistance
- glass
- glass-ceramics
- hardness