A novel high yield polyborosilazane precursor for SiBNC ceramic fibers

作者:Zhang, Chenyu; Han, Keqing*; Liu, Yong*; Mou, Shiwei; Chang, Xuefeng; Zhang, Hui; Ni, Jiaqi; Yu, Muhuo
来源:Ceramics International, 2017, 43(13): 10576-10580.
DOI:10.1016/j.ceramint.2017.04.120

摘要

A novel processable and high yield polyborosilazane (PBSZ) precursor for SiBNC ceramic fibers was synthesized via boron trichloride (BCl3), co-polymerization of trichlorosilane (SiHCl3) and methylamine (MeNH2), followed by trans-amination with NH3. 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 mu m could be easily obtained by melt spinning. The green fibers were subsequently pyrolyzed at 1200 degrees C in nitrogen atmospheres to provide SiBNC ceramic fibers with a cylindrical hollow structure, ca.32 mu m in diameter and 720 MPa in tensile strength. The green fibers had an approximately ceramic yield of 78% at 900 degrees C.