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

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 crac...

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Bibliographic Details
Published inJournal of the American Ceramic Society Vol. 103; no. 6; pp. 3600 - 3609
Main Authors Ke, Xuefei, Shan, Zhitao, Li, Zihuang, Tao, Yunhang, Yue, Yuanzheng, Tao, Haizheng
Format Journal Article
LanguageEnglish
Published Columbus Wiley Subscription Services, Inc 01.06.2020
Subjects
Aluminosilicates
Aluminum oxide
Aluminum silicates
Ceramics
crack growth resistance
Crack propagation
glass
glass‐ceramics
Hardness
Industrial research
Isothermal treatment
Laser beam melting
Levitation
Magnesium aluminosilicate
Scale models
Silica glass
Silicon dioxide
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Summary: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. Synergistically enhanced HV and CR for MgO‐Al2O3‐SiO2 glasses and glass ceramics
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.17048