1. A novel high yield polyborosilazane precursor for SiBNC ceramic fibers.
- Author
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Zhang, Chenyu, Han, Keqing, Liu, Yong, Mou, Shiwei, Chang, Xuefeng, Zhang, Hui, Ni, Jiaqi, and Yu, Muhuo
- Subjects
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SILAZANES , *PRECERAMICS , *SILICON compounds , *CERAMIC fibers , *PYROLYSIS , *THERMAL properties , *METHYLAMINES , *BORON compounds - Abstract
A novel processable and high yield polyborosilazane (PBSZ) precursor for SiBNC ceramic fibers was synthesized via boron trichloride (BCl 3 ), co-polymerization of trichlorosilane (SiHCl 3 ) and methylamine (MeNH 2 ), followed by trans-amination with NH 3 . The synthesized PBSZ precursor was characterized and the results showed that the polymeric precursor exhibited good melt–processability and green fibers with a diameter of 45 µm could be easily obtained by melt spinning. The green fibers were subsequently pyrolyzed at 1200 °C in nitrogen atmospheres to provide SiBNC ceramic fibers with a cylindrical hollow structure, ca.32 µm in diameter and 720 MPa in tensile strength. The green fibers had an approximately ceramic yield of 78% at 900 °C. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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