کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1652749 1007647 2007 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Difference in carbo-thermal reduction reaction kinetics of NiO in microwave E- and H-fields
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Difference in carbo-thermal reduction reaction kinetics of NiO in microwave E- and H-fields
چکیده انگلیسی

A powder mixture of NiO and graphite was heated in a single mode-microwave (MW) applicator at 2.45 GHz for carbo-thermal reduction of NiO. The specimen was placed in the wave guide at maximum positions of either electric (E) field or magnetic (H) field and kept at a constant temperature.A tendency was observed that the reduction rate at 600 °C was larger in the H-field than in the E-field. Considering the fact that NiO can be heated only in the E-field, while graphite can be heated in both fields, graphite particles in the powder mixture might be selectively heated in the H-field. Hence, it is postulated that a microscopic temperature gradient is formed more in the H-field, which caused the gas convection, then the mass transfer and the gas–solid reaction is enhanced, so the enhanced reduction kinetics resulted, eventually.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Letters - Volume 61, Issue 10, April 2007, Pages 2096–2099
نویسندگان
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