Fabrication and properties of precursor-derived SiBN ternary ceramic fibers

Publication date: 15 August 2017
Source:Materials & Design, Volume 128
Author(s): Yong Liu, Shuai Peng, Yongjie Cui, Xuefeng Chang, Chenyu Zhang, Xianhua Huang, Keqing Han, Muhuo Yu
In this paper, polymer precursor polyborosilazane (PBSZ) was synthesized from hexamethyldisilazane, HSiCl3, BCl3 and CH3NH2 using a multi-step polymerization process. Continuous PBSZ fibers were prepared by a laboratory scale melt-spinning machine. SiBN ceramic fibers were then obtained by the pyrolysis of PBSZ fibers. The chemical structure character and its ceramic conversion of the polymer precursor were presented. After high temperature pyrolysis process at 1100°C, SiBN ceramic fibers were obtained with a diameter of about 14μm. Those fibers showed average tensile strength of 0.87GPa. The carbon content of the obtained SiBN ceramic fibers was less than 0.1wt%. SiBN ceramic fibers revealed excellent dielectric properties and structural stability at high temperatures.

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