کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7889124 1509795 2018 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The control of abnormal grain growth in low-voltage SnO2 varistors by microseed addition
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
The control of abnormal grain growth in low-voltage SnO2 varistors by microseed addition
چکیده انگلیسی
In this research, the addition effects of three different quantities of micron-sized seeds (microseeds) to a SnO2 varistor prepared from nanomaterials on the microstructure and electrical properties were studied. Moreover, surge-withstanding capability of low-voltage SnO2 varistors was investigated. The X-ray diffraction pattern disclosed a single phase SnO2 for microseed grains. The morphological features of samples were characterized using scanning electron microscopy. The abnormal distribution of grain size with elongated grains of SnO2 in fine grains matrix was observed in sintered samples without microseeds. The low content of microseed addition (0.3 wt%) had not controlled abnormal grain growth, however, it increased mean grain size to 37 µm. Although the high content of microseeds (7.5 wt%) stopped abnormal grain growth, it had a negative effect on relative density and mean grain size. The normal grain size distribution with maximum mean grain size (45 µm) was obtained in samples containing 1.5 wt% microseeds. These samples showed the lowest breakdown field (240 V/cm) and the highest surge-withstanding capability (1.5 kA/cm2). Furthermore, the standard deviation of the electrical parameters of these samples was improved due to normal grain-size distribution.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 44, Issue 3, 15 February 2018, Pages 3388-3393
نویسندگان
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