کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1480319 1510404 2016 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Glass-forming ability, sinter-crystallization behavior and microwave dielectric properties of MgO-B2O3-(Al2O3)-SiO2 glass-ceramics
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Glass-forming ability, sinter-crystallization behavior and microwave dielectric properties of MgO-B2O3-(Al2O3)-SiO2 glass-ceramics
چکیده انگلیسی


• Addition of Al2O3 to the composition led to an increase in the glass forming potential of the studied glasses.
• Magnesium borate, magnesium silicate and cordierite precipitated in the fabricated glass-ceramics.
• Dielectric characterization confirmed the suitability of the fabricated glass-ceramics as fully dense dielectric substrates.

The present work aims to survey sinterability, crystallization behavior and microwave dielectric characteristics of MgO-B2O3-SiO2 glass-ceramics in the presence of 1–10 weight ratios of Al2O3. It was shown that changing the base composition and addition of Al2O3 led to an increase in the glass-forming potential. Fully densified glass-ceramics were achieved by sintering below 950 °C from all selected compositions. During sintering, magnesium borate and magnesium silicate were formed in all specimens whilst cordierite was also crystallized in the specimens contained > 5 weight ratios of Al2O3. Based on the FESEM observation, magnesium borate and magnesium silicate adopted a nanometric spherical morphology and cordierite had a platelet-like morphology.Due to the increased interface areas between crystalline phases and consequent intensified space charge polarization, addition of Al2O3 to the studied compositions did not affect dielectric properties, positively. However, the microwave dielectric characterization confirmed the suitability of the fabricated glass-ceramics as low-permittivity fully dense dielectric substrates.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 441, 1 June 2016, Pages 34–41
نویسندگان
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