کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1476161 991144 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
New manufacturing process for nanometric SiC
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
New manufacturing process for nanometric SiC
چکیده انگلیسی

Nanometric β-SiC powder was prepared by carbothermal reduction of freeze-dried gel. Initially, the gel was obtained by polycondensation of sol consisting of resorcinol and formaldehyde as a source of C and tetraethoxysilane as a source of silicon. The effect of temperature and time of heat treatment (carbothermal reduction) as well as the effect of C/Si ratio on SiC powder properties was studied. It was possible to obtain nanosized (∼20 nm) β-SiC powder after one-hour heat treatment at relatively low temperature of 1200 °C. The powder was successfully synthesised without the need for excess carbon which is typical for conventional carbothermal reduction using some other sources of graphite. The increase in temperature of heat treatment to 1400 °C caused considerable growth of SiC particles up to 400 nm. It was found that prolonged heat treatment at 1200 °C is an effective way to obtain well crystallized SiC and keep the size of SiC particles below 50 nm at the same time.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 32, Issue 9, July 2012, Pages 1901–1906
نویسندگان
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