Preparation of hollow Si-B-N ceramic fibers by partial curing and pyrolysis of polyborosilazane fibers

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• 作者：Wenhua Li ; Jun Wang ; ^{csgl4519783@hotmail.com} ; Zhengfang Xie ; Hao Wang ; Yun Tang
• 关键词：Polymers ; Fiber technology ; Ceramics ; Dielectric properties
• 刊名：Materials Letters
• 出版年：2012
• 出版时间：1 July, 2012
• 年：2012
• 卷：78
• 期：Complete
• 页码：1-3
• 全文大小：339 K

文摘

Hollow silicon boron nitride (Si-B-N) ceramic fibers with composition of Si_0.3BN_1.4 were prepared by melt-spinning, partial curing with trichlorosilane (HSiCl₃), and pyrolysis of a novel polyborosilazane under NH₃ up to 1000 ¡ãC. The polyborosilazane fibers with low ceramic yield were partially cured to make sure the hollow Si-B-N ceramic fibers could be fabricated after pyrolysis. The hollow Si-B-N ceramic fibers were ~ 16 ¦Ìm in diameter with inner hollow pore diameter of ~ 4 ¦Ìm, and showed good average tensile strength of 1.03 GPa and elastic modulus of 106 GPa. Moreover, the hollow Si-B-N ceramic fibers also exhibited excellent dielectric properties with the average dielectric constant real part and loss tangent about 3.06 and 0.0032 at 2-18 GHz, respectively, making them to be promising microwave-transparent materials.