کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1571732 | 1000652 | 2010 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
SiC-based cermet with electrically conductive grain boundaries
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The present paper deals with the characterization of structural and electrical properties of SiC-based cermets prepared by in situ reaction. The surface structure and electrical conductivity of the samples was investigated by the standard four-point probe method, SEM, TEM, AFM, and STM techniques. It was found that the electrical conductivity of the SiC-based ceramic-metal composites increases with increased fraction of metallic phases. Interestingly, samples containing app. 12Â vol.% of non-percolated (isolated) metallic phases exhibit up to 2 orders of magnitude better electrical conductivity compared with the base-line liquid phase sintered SiC (LPS SiC). This effect results from doping of the SiC grains by diffusion of metallic components as well as from chemical modification of the grain boundary phases due to the reaction of sintering aids and metallic particles at high sintering temperatures. Absorbed current measurements using SEM, as well as AFM in spreading resistance and STM in tunneling mode were used for visualization of electrical pathways.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 61, Issue 4, April 2010, Pages 420-426
Journal: Materials Characterization - Volume 61, Issue 4, April 2010, Pages 420-426
نویسندگان
M. Balog, J. KováÄ, A. Å atka, D. HaÅ¡ko, J. Zhang, M.A. Crimp, O. Vávra, I. Vávra,