کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
831117 1470364 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microstructure and mechanical properties of porous Si3N4 ceramics prepared by freeze-casting
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی (عمومی)
پیش نمایش صفحه اول مقاله
Microstructure and mechanical properties of porous Si3N4 ceramics prepared by freeze-casting
چکیده انگلیسی

Porous silicon nitride (Si3N4) ceramics were prepared from water-based Si3N4 slurries via a freeze-casting process. The green body shows good replica of ice dendrites with uniform pore channels. The microstructure of porous Si3N4 ceramics could be controlled by the freezing temperature. After sintering, porous Si3N4 ceramics with uniform microstructure was obtained. At low freezing temperature, the pore size distribution was narrower and concentrated with pore morphology from tree-like to vimineous channels. Porous Si3N4 ceramics with a porosity of 51%, flexural strength of 77 MPa, and aspect ratio (AR) of 5.20 was obtained at 1850 °C with 3% sintering additives.


► The porous ceramics was a good replica of ice dendrites with uniform pore channels.
► With temperature decreasing, the sample was a simpler pore size distribution.
► The porous Si3N4 ceramics was vimineous channels pore with lower temperature.
► The sample was not only a uniform microstructure but also good mechanical properties.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials & Design - Volume 33, January 2012, Pages 98–103
نویسندگان
, , ,