1. Effects of hydrolysis of precursor on the structures and properties of polymer-derived SiBN ceramic fibers.
- Author
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Liu, Yong, Chen, Kangzhuang, Dong, Fengbo, Peng, Shuai, Cui, Yongjie, Zhang, Chenyu, Han, Keqing, Yu, Muhuo, and Zhang, Hui
- Subjects
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HYDROLYSIS , *POLYMERS , *CERAMICS , *X-ray diffraction , *TENSILE strength - Abstract
In this paper, polyborosilazane precursor was synthesied from HMDZ, HSiCl 3 , BCl 3 and CH 3 NH 2 using a multistep method. By controlling the storage conditions, parts of the polyborosilazane fibers were hydrolyzed. FT-IR, NMR, XRD, TEM and monofilament tensile strength test were employed to study the effects of hydrolysis of precursor on the structures and properties of polymer-derived SiBN ceramic fibers. FT-IR and NMR results indicate that Si-N group in PBSZ reacts with H 2 O to form Si-O-Si group. After pyrolysis reaction at 1400℃, Si-O-Si group will finally transformed into highly ordered cristobalite and β-quartz, resulting in formation of the wrinkled surface of the obtained SiBN ceramic fiber. The strip-like defects on fiber surface, according to monofilament tensile strength test, had a significant effect on mechanical property of the obtained SiBN ceramic fiber and caused no increase in fiber tensile strength of hydrolytic polyborosilazane fiber before and after pyrolytic process. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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