1. Mechanical properties of transparent sodium phosphosilicate glass-ceramics
- Author
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Zhang, Qi, Christensen, Rasmus, Bødker, Mikkel L., Du, Tao, To, Theany, Muñoz, Francisco, Bauchy, Mathieu, Smedskjaer, Morten M., Zhang, Qi, Christensen, Rasmus, Bødker, Mikkel L., Du, Tao, To, Theany, Muñoz, Francisco, Bauchy, Mathieu, and Smedskjaer, Morten M.
- Abstract
[EN] Glass-ceramics feature excellent mechanical properties but tend to lack transparency due to the presence of large crystals with a different refractive index from the matrix glass. Here, we investigate the relationship between the heterogeneous microstructure, mechanical properties (hardness, crack resistance, and fracture toughness), and transparency in Na2O–P2O5–SiO2 glass-ceramics. The mechanical properties are determined by the combination of crystal type, content, and size, as well as the remaining glass-matrix structure. The crystal fraction and size increase upon heat treatment, whereas the network connectivity of the residual glass-matrix phase decreases. These observed changes have opposite effects on crack resistance and fracture toughness. Changes in crystallization behavior have a more significant effect on crack resistance relative to that on fracture toughness, while changes in crystal size have a more pronounced effect on fracture toughness. The glass-ceramic samples feature excellent transmittance and reach a maximum fracture toughness of 1.1 MPa m 0.5.
- Published
- 2023