کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1638615 1516997 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of pyrolytic carbon coatings on complex permittivity and microwave absorbing properties of Al2O3 fiber woven fabrics
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Influence of pyrolytic carbon coatings on complex permittivity and microwave absorbing properties of Al2O3 fiber woven fabrics
چکیده انگلیسی
The pyrolytic carbon (PyC) coatings were fabricated on Al2O3 fiber fabrics by the method of chemical vapor deposition (CVD). The microstructures of Al2O3 fibers with and without PyC coatings were characterized by SEM and Raman spectroscopy. The influence of deposition time of PyC on the DC conductivity (σd) of Al2O3 filaments and complex permittivity of fabrics at X band (8.2-12.4 GHz) were investigated. The values of σd and complex permittivity increase with increasing deposition time of PyC. The electron relaxation polarization and conductance loss were supposed to be contributed to the increase of ɛ′ and ɛ″, respectively. In addition, the reflection loss (RL) of fabrics was calculated. The results show that the microwave absorbing properties of Al2O3 fiber fabrics can be improved by PyC coatings. The best RL results are for 60 min-deposition sample, of which the minimum value is about −40.4 dB at about 9.5 GHz and the absorbing frequency band (AFB) is about 4 GHz.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Transactions of Nonferrous Metals Society of China - Volume 22, Issue 2, February 2012, Pages 354-359
نویسندگان
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