کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
830313 1470353 2013 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microstructure and properties of porous silicon nitride ceramics prepared by gel-casting and gas pressure sintering
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی (عمومی)
پیش نمایش صفحه اول مقاله
Microstructure and properties of porous silicon nitride ceramics prepared by gel-casting and gas pressure sintering
چکیده انگلیسی

Wave-transparent porous Si3N4 ceramics were prepared by gel-casting and gas pressure sintering, and the effects of solid loading on microstructure, mechanical and dielectric properties were investigated. Microstructures with interlocked elongated β-Si3N4 grains and uniformly distributed pores were observed, while both the β-Si3N4 phase content and grain aspect ratio reduced as the solid loading increased due to the restrained anisotropic growth of β-Si3N4 grains. As the solid loading increased from 30 to 45 vol.%, the porosity of ceramics declined from 57.6% to 36.4%. The flexural strength increased linearly from 108.3 to 235.1 MPa, and the dielectric constant and loss tangent of ceramics increased from 2.63 and 2.85 × 10−3 to 3.68 and 3.56 × 10−3 (10 GHz), respectively.


► Gel-casting and GPS is an effective way to prepare porous Si3N4 ceramics.
► Porosity and microstructure are largely dependent on the solid loadings.
► Porous Si3N4 ceramics have desirable mechanical properties.
► Porous Si3N4 ceramics have suitable dielectric properties.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials & Design - Volume 44, February 2013, Pages 114–118
نویسندگان
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