کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7893505 1509959 2018 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Oxidation behavior of Si3N4 fibers derived from polycarbosilane
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Oxidation behavior of Si3N4 fibers derived from polycarbosilane
چکیده انگلیسی
Si3N4 fibers prepared from polycarbosliane are exposed in dry and wet air respectively from 800 to 1300 °C for up to 1 h. After dry air oxidation, an uniform SiO2 coating doped with nitrogen is formed on fiber surface. However, the coating obtained in wet air is much thicker with more complex microstructure containing sub-layers of N-doped SiO2, near stoichiometric Si3N4 and graphite-like nanoribbons. Activation energy for oxidation in wet and dry air is determined as 108 and 152 kJ mol−1, respectively. Both of the values are lower than the known Si3N4 materials with Ea of 259-485 kJ mol−1.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Corrosion Science - Volume 136, 15 May 2018, Pages 9-17
نویسندگان
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