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Preparation and Property of SiBN Ternary Ceramic Fibers Prepared by Polyborosilazane-Derived Method |
Yongjie CUI,Yong LIU( ),Shuai PENG,Keqing HAN,Muhuo YU |
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China |
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Cite this article:
Yongjie CUI,Yong LIU,Shuai PENG,Keqing HAN,Muhuo YU. Preparation and Property of SiBN Ternary Ceramic Fibers Prepared by Polyborosilazane-Derived Method. Chinese Journal of Materials Research, 2019, 33(2): 155-160.
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Abstract Polyborosiliazne precursor was synthesized via multi-stage polymerization process with HSiCl3, Me6Si2NH, BCl3 and CH3NH2 as raw materials. Then SiBN ceramic fibers were obtained by melt spinning, curing and pyrolysis of the as-synthesized polyborosilazane precursor. The chemical structure, high temperature thermal stability, dielectric property and mechanical property of the polyborosilazane and its pyrolysis products were investigated by FT-IR, NMR, XRD, TEM and TGA. FT-IR and NMR. Results show that the polyborosilazane precursors prepared at different temperatures exhibited similar chemical structures, namely, containing Si-N, B-N and N-CH3 bonds. The obtained SiBN ceramic fibers remained amorphous structure with 14 μm in diameter and 0.91 GPa in tensile strength after heat treatment at 1400oC. The SiBN ceramic fibers have excellent thermal stability with only 1.5% mass loss in the temperature range from room temperature to 1400oC. The dielectric constant and dielectric loss loss tangent magnitude of SiBN ceramic fibers are 2.6~2.8 and 10-2 at 1100oC, respectively.
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Received: 06 June 2018
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Fund: National Natural Science Foundation of China(51703025) |
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