کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7901329 | 1510434 | 2015 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Viscosity profiles of phosphate glasses through combined quasi-static and bob-in-cup methods
ترجمه فارسی عنوان
پروفیل ویسکوزیته عینک فسفات از طریق روش های ترکیبی شبه استاتیک و بوب در فنجان
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
چکیده انگلیسی
This study used a combined viscosity approach to determine theoretical fibre drawing points for glasses in the series: xP2O5, 24MgO, 16CaO, (60-x)Na2O (x = 40,45,50,55) and yP2O5, 24MgO, 16CaO, (55-y)Na2O, 5Fe2O3 (y = 40,45,50,55). The points cannot be measured directly since the glasses are only kinetically stable at these points and would crystallise if allowed to equilibrate. Quasi-static and bob-in-cup viscosity data from above and below the range of interest were fitted to the Vogel-Fulcher-Tammann equation and provided good agreement. The theoretical drawing points were taken as the temperature at which the glass has a viscosity of 2 Log Pa·s, based on the known drawing point viscosity of silica glasses. The theoretical drawing points for the glasses ranged from 657 to 839 °C. The viscosity information was also used to assess the fragility of the glasses in comparison with a borosilicate standard by using Doremus and Angell parameters. All of the glasses were of low viscosity and high fragility in comparison to the borosilicate. The fragility improved above 50% content of phosphate in the glass and the addition of iron had little effect on the fragility. Additionally, the limitations of the borosilicate 717a standard glass and the measurement of Tg are discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 408, 15 January 2015, Pages 76-86
Journal: Journal of Non-Crystalline Solids - Volume 408, 15 January 2015, Pages 76-86
نویسندگان
A.J. Parsons, N. Sharmin, Sharifah I.S. Shaharuddin, M. Marshall,