کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10629874 991195 2005 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Oxidation protection of C/C-SiC composites by an electrophoretically deposited mullite precursor
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Oxidation protection of C/C-SiC composites by an electrophoretically deposited mullite precursor
چکیده انگلیسی
Electrophoretic deposition (EPD) is a suitable technique to produce mullite layers for acceptable oxidation protection of C/C-SiC composites. Combining sol-gel synthesis of 3Al2O3·2SiO2 mullite through hydrolysis and condensation of tetraethoxysilane (TEOS) and aluminum-tri-sec-butylate (Al-(OBu)3) with EPD yields sufficiently thick and homogeneous layers, which transform into mullite at 1300 °C. The protectiveness of the deposited mullite layers was tested in air in the temperature range 1300°C≤T≤1550 °C by means of isothermal thermogravimetric analysis for up to 200 h. The experimental data can be described by a phenomenological model of the (reduced) oxidation rate of the SiC layer underneath the outer mullite layer, which suggests that transport of carbon monoxide through mullite and silica is rate determining. Comparing the oxidation rate of electrophoretically coated C/C-SiC samples to that of uncoated reference samples clearly demonstrates that mullite offers a significant improvement to the oxidation resistance of the reference material.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 25, Issue 5, February 2005, Pages 577-587
نویسندگان
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