کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1460809 989610 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Temperature dependence of Young׳s modulus of silica refractories
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Temperature dependence of Young׳s modulus of silica refractories
چکیده انگلیسی

The temperature dependence of Young׳s modulus of silica refractories exhibiting pore volume fractions in the range 18.6–20.9% is investigated via impulse excitation up to 800–1000 °C and four-point bending up to 500 °C. This temperature dependence exhibits a broad valley approximately below 200 °C, where Young׳s modulus values decrease to 55–62% of their room temperature magnitude. Upon further heating, Young׳s modulus increases steeply within a few degrees around 230 °C, followed by an S-shaped increase to maximum values corresponding to 174–282% of the room temperature values. Cooling branches are different from heating branches and do not form closed loops, indicating damage accumulation. Dilatation measurements, polarization microscopy, micromechanical calculations and X-ray phase analysis are used to underpin the conclusion that the observed elastic effects are not caused by phase transitions alone, but are combined effects of phase transitions and microcrack opening and partial closure.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 41, Issue 1, Part B, January 2015, Pages 1129–1138
نویسندگان
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