Journal
CERAMICS INTERNATIONAL
Volume 45, Issue 16, Pages 20172-20177Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.06.286
Keywords
Polymeric precursor; Pyrolysis mechanism; High-temperature behavior; SiBN ceramic fibers
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Funding
- National Natural Science Foundation of China [51703025]
- Fundamental Research Funds for the Central Universities [2232019D3-06, 2232019G-02]
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A novel polymeric precursor polyborosilazane (PBSZ) for SiBN ternary ceramic fibers was successfully synthesized from trichlorosilane (HSiCl3), boron trichloride (BCl3) and hexamethyldisilazane (HDMZ) by a simple one step reaction process. The chemical structures and ceramic yield of the PBSZ precursors were investigated by NMR spectroscopy, FT-IR and TGA. The preparation of PBSZ fibers was conducted in a lab-scale melt-spinning equipment at a spinning speed of 130 m/min. SiBN ternary ceramic fibers were obtained after the non-fusible treatment and pyrolysis of PBSZ fibers in an NH3 atmosphere. The pyrolysis mechanism, high-temperature behavior and morphologies of the SiBN ternary ceramic fibers were investigated by NMR, XRD, TEM and SEM. The obtained SiBN ternary ceramic fibers had good flexibility, and possessed a tensile strength of 0.84 GPa with a diameter of 18 pm. Furthermore, these SiBN ceramic fibers exhibited excellent thermal stability, and maintained the amorphous state up to 1600 degrees C.
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