کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1474438 991089 2014 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fabrication and properties of borazine derived boron nitride bonded porous silicon aluminum oxynitride wave-transparent composite
ترجمه فارسی عنوان
ساخت و خواص بورازین مشتق شده از نیترید بور نیترید متصل سیلیکون آلومینیوم اکسینیتوریدهای موج شفاف کامپوزیت
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی

Boron nitride bonded porous silicon aluminum oxynitride composite was fabricated by gel-casting, precursor infiltration and pyrolysis process, and the composition, microstructure, mechanical and dialectical properties of the composite were characterized. The results show that the composite is comprised of β-SiAlON (z = 3) synthesized from mixed ceramic powders, and continuous h-BN pyrolyzed from borazine, with a relatively high porosity of 24.21%. The flexural strength, elastic modulus and fracture toughness of the composite are 178.58 MPa, 75.51 GPa and 4.54 MPa m1/2, respectively. The sintering shrinkage of SiAlON ceramics can be greatly decreased by the borazine infiltration and pyrolysis process. The existence of h-BN phase and the high porosity reduce the values of dielectric constant and loss tangent of the composite, which are 3.51–3.69 and 0.9–3.1 × 10−3 at the frequency from 7 to 18 GHz with the elevating temperature from 25 to 1200 °C.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 34, Issue 15, December 2014, Pages 3591–3595
نویسندگان
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