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Highly translucent nanostructured glass-ceramic
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DOI：10.1016/j.ceramint.2020.10.039.png)
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摘要
En 中文
Transparent and translucent glass-ceramics (GCs) are found in an increasing number of domestic and high-technology applications. In this paper, we evaluated and optimized the effects of two-stage heat treatments on the resulting crystalline phases and microstructure of a glass of the SiO2-Li2O-P2O5-TiO2-CaO-ZnO-Al 2O3 system. The objective was to develop a transparent nanostructured glass-ceramic (GC). After numerous heat treatment trials, we found that a long nucleation period of 72 h at 455 degrees C followed by a crystal growth treatment at 660 degrees C for 2 h resulted in a highly translucent GC having homogenously distributed nanocrystals. The relatively high amount of P2O5 (2.5 mol%) induced the formation of lithium disilicate as the main crystal phase. We thus developed a GC having crystals under 50 nm, with a high crystallized fraction (52%vol. Li2Si2O5 and 26% vol Li2SiO3), transmittance of approximately 80% in the visible spectrum for 1.2 mm thick specimens, nano hardness of 8.7 +/- 0.1 GPa (load of 400 mN), a high elastic modulus of 138 +/- 3 GPa as measured by nanoindentation, and good flexural strength (350 +/- 40 MPa) as measured by ball-on-3 balls tests. Due to its high content of Li+, this GC has the potential to be chemically strengthened and can be further developed to be used in a number of applications, such as on displays of electronic devices.
Keyword:
Glass-ceramic
Translucent
Crystallization
Mechanical properties
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期刊
IF:
5.6
论文数:
5.1W
被引数:
15.5W
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Behavior of the refractive index of lithium disilicate glass ceramic processed at high pressure and high temperature.png)
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OPTICAL MATERIALSIF4.2
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