کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9777943 | 1510152 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Complete characterisation of BN fibres obtained from a new polyborylborazine
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
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چکیده انگلیسی
A new polymer was prepared at room temperature from a di-chloroborazine and a reactive aminoborane. It displays borazine rings unambiguously linked through three atoms N-B-N bridges. This connecting mode was evidence by 15N solid state NMR. This polyborazine was processed into a continuous polymer fibre of about 21 μm diameter, which was subsequently heat-treated under NH3/N2 up to 1800 °C for conversion into BN fibres. The achievement of hexagonal boron nitride was confirmed by X-ray diffraction and Raman spectroscopy. Tensile tests were carried out on the ceramic fibres. The average tensile strength is about 1000 MPa and the Young's modulus is close to 200 GPa. Structural characterisation of the BN fibres was undertaken by polarised light and transmission electronic microscopies.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 25, Issues 2â3, 2005, Pages 137-141
Journal: Journal of the European Ceramic Society - Volume 25, Issues 2â3, 2005, Pages 137-141
نویسندگان
B. Toury, D. Cornu, F. Chassagneux, P. Miele,