Synthesis, Structure and Properties of MgO-Al2O3-SiO2-B2O3 Transparent Glass-Ceramics
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MgO-Al2O3-SiO2-B2O3 system transparent glass-ceramics have been prepared by conventional melt-quenching method followed by controlled crystallization, and their properties were also studied. The crystalline phases, crystal morphology, physical and light transmittance properties of glass-ceramics were characterized by DSC, XRD, FTIR, FE-SEM, thermo-mechanical analyzer and UV spectrophotometer. The results indicated that the crystal phase μ-cordierite turned to α-cordierite with increase in heat treatment temperature, and cordierite nanocrystals with size less than 50 nm were precipitated from the matrix glass, which was confirmed by the X-ray and SEM results. It is observed that the main elements in the glass-ceramics are uniformly distributed from EDS element distribution maps. The light transmittance of glass-ceramics obviously decreases with rising of crystallization time. All things considered, when the parent glass was crystallized at 1045 °C for 1 h, the prepared glass-ceramics possesses good light transmittance (76 %), lower density (2.498 g/cm3), lower thermal expansion coefficient (2.469 × 10− 6/°C), higher bending strength (167 MPa), compressive strength (376 MPa) and higher Vickers hardness (7.8 GPa). The combination of excellent mechanical, thermal and optical properties makes this family of transparent glass-ceramics showing potential applications.
KeywordsGlass-ceramics Crystallization Heat treatment Light transmittance
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This work has been supported by the National Nature Science Foundation of China (No. 51672310) and the Project of Technology Promotion and Industrialization for key basic Materials in China (No. 2017YFB0310200).
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