Synthesis and characterization of a new liquid polymer precursor for Si–B–C–N ceramics

Author： Zhang Zongbo Zeng Fan Han Juanjuan Luo Yongming Xu Caihong

ISSN： 0022-2461

Source： Journal of Materials Science, Vol.46, Iss.18, 2011-09, pp. : 5940-5947

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Abstract

A new liquid polyborosilazane precursor for Si–B–C–N ceramic was synthesized by co-condensation reaction of boron trichloride, organodichlorosilanes, and hexamethyldisilazane. The structure and properties of polyborosilazane were studied by means of Fourier transform-infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR), rheology, and thermogravimetric analysis (TGA). The conversion of polymer to ceramic and the high-temperature behavior of the new polymer-derived ceramic were investigated by TG–MS, FT-IR, X-ray diffraction (XRD) and high-temperature TGA (HTGA). The ceramics showed good oxidative resistance and thermal stability with weight gain of 1.8 wt% at 1350 °C under air atmosphere and weight loss of 2.6% at 1900 °C under Ar atmosphere.