کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1576115 1514765 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microstructure and room temperature mechanical properties of mullite fibers after heat-treatment at elevated temperatures
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Microstructure and room temperature mechanical properties of mullite fibers after heat-treatment at elevated temperatures
چکیده انگلیسی
The composition and microstructure of Nitivy ALF 2880D fibers after heat-treatment at elevated temperatures are investigated by XRD, FT-IR, SEM and TEM analyses. Tensile properties of as-received and heat-treated fiber bundles have been studied. The results show that as-received fibers consist of γ-Al2O3, amorphous silica, and a little boron oxide. During heat-treatment process, boron oxide firstly melts and flows, resulting in large amount of liquid ravines, and then volatilizes, leaving several holes on fiber surface. Reaction between γ-Al2O3 and amorphous silica begins when heat-treated temperature is above 1100 °C, and completes at 1300 °C. As heat-treated temperature increases from 1100 °C to 1400 °C, grain growth of mullite starts and leads to the reduction of room temperature tensile strength of fibers. Tensile strength of fibers stays stable when heat-treated temperature is below 1200 °C, while the strength retention of fibers sharply decreased to 50% after heat-treatment at 1300 °C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 578, 20 August 2013, Pages 287-293
نویسندگان
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