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Acta Chimica Sinica ›› 2009, Vol. 67 ›› Issue (23): 2750-2754. Previous Articles Next Articles
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唐云,王军,李效东,李文华,王小宙,王浩
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国防基础科研项目(No.A2820060068);国家高技术研究发展(863)计划(No. 2006AA03217);国家自然科学基金(No. 50702075;50802113)
Tang, Yun*,Wang, Jun,Li, Xiaodong,Li, Wenhua,Wang, Xiaozhou,Wang, Hao
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Si-B-N ceramic fibers with composition Si1.13BN2.47 were prepared by melt-spinning, curing and pyrolysis of a preceramic polyborosilazane. The composition, structure and properties of the fibers were characterized by elemental analysis, FT-IR, X-ray diffraction, SEM and wave-guide methods. The fibers show good room temperature mechanical properties. The average tensile strength (σ) and elastic modulus (E) of Si-B-N fibers is 1.8 and 196 GPa, respectively. They also exhibit excellent high temperature resistance and remain amorphous up to 1700 ℃ in inert atmospheres. A mixture of Si3N4 and BN crystalline phases was observed upon heating to 1850 ℃. In addition, the obtained fibers show good dielectric properties according to the measurement by a wave-guide technique. The average dielectric constant (ε) and loss tangent (tan δ) of the as-obtained fibers are about 3.68 and 0.0042 in 2~18 GHz, respectively. Such performance characteristics make the Si-B-N fiber promising candidate as reinforcement for application to high temperature radar-wave transparent composite materials.
Key words: Si-B-N ceramic fiber, polymer derived method, polyborosilazane, wave-transparent fiber, high temperature resistance
TANG Yun, WANG Jun, LI Xiao-Dong, LI Wen-Hua, WANG Xiao-Zhou, WANG Gao. Preparation of High Performance Si-B-N Ceramic Fibers by Polymer Derived Method[J]. Acta Chimica Sinica, 2009, 67(23): 2750-2754.
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