کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1530883 1512004 2008 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microstructure of silicon carbide nano powder–polycarbosilane–solvent mixed slurries and observed shear rate dependence in slurry viscosity
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Microstructure of silicon carbide nano powder–polycarbosilane–solvent mixed slurries and observed shear rate dependence in slurry viscosity
چکیده انگلیسی

SiC powder, polycarbosilane and xylene mixed slurries were prepared for microstructure observation and viscosity measurement. Slurries with averaged primary SiC size of 270 or 50 nm revealed existence of isolated secondary particles smaller than 1 μm in optical microscope observation. These secondary particles showed a Brownian motion in a xylene-PCS medium. On the other hand, slurry with an averaged primary SiC size of 20 nm revealed existence of large secondary particles in the size of 2–5 μm. The apparent area occupied with these secondary particles was far larger than that occupied by secondary particles of 270 or 50 nm in spite of a low SiC content. It was suggested that the secondary particles observed in the 20 nm slurry possessed small spaces among the primary SiC particles. Viscosity measurement presented that apparent viscosity of the slurry was high in general when the primary SiC particle size was small. In particular, the 20 nm SiC slurries showed quite high viscosity even at a SiC content of 5–6 mass%, which almost corresponded to that of 40 mass% for a SiC 270 nm slurry. Shear thinning effect was also remarkable when the primary SiC particle size was small.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: B - Volume 148, Issues 1–3, 25 February 2008, Pages 187–191
نویسندگان
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