Abstract
The crystallization of magnesium–aluminosilicate glasses is monitored, described and discussedviaX-ray absorption spectroscopy and analytical transmission electron microscopy.
Highlights
Glass-ceramics based on the MgO/Al2O3/SiO2 (MAS) system have excellent mechanical properties, such as high hardness, Young's modulus, strength and fracture toughness.[1,2,3,4,5,6,7] Since the MAS system tends to surface nucleation,[8,9,10,11] the addition of nucleating agents such as TiO2,1,12–14 ZrO2 2–7,14–16 or both[17,18] is necessary to achieve bulk crystallization
Thorough presentations of the X-ray diffraction (XRD) and (S)TEM results of these samples have been published previously, they are, summarized and recapitulated in the following in order to complete the picture of the crystallization processes that is drawn within this study.[5,6]
In the Y2O3-containing glass, strong differences in the microstructure and in the phase composition are observed in comparison to the glass without the addition of Y2O3 a er an appropriate two-stage heat treatment at 950 C for 5 h and at 1060 C for 0–1 h
Summary
Glass-ceramics based on the MgO/Al2O3/SiO2 (MAS) system have excellent mechanical properties, such as high hardness, Young's modulus, strength and fracture toughness.[1,2,3,4,5,6,7] Since the MAS system tends to surface nucleation,[8,9,10,11] the addition of nucleating agents such as TiO2,1,12–14 ZrO2 2–7,14–16 or both[17,18] is necessary to achieve bulk crystallization.
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