Study on synthesis, curing kinetics and ceramic product’s properties of SiBCN ceramic precursor

doi:10.19936/j.cnki.2096-8000.20240628.002

Abstract

Abstract: Four SiBCN precursors with low viscosity were synthesized by dehydrogenation of polysilazane and borazine. The precursor molecular structure, curing kinetics and ceramicized product’s properties of SiBCN precursorswere investigated by fourier transform infrared spectrometry (FTIR), differential scanning calorimetry (DSC), ultra-high temperature thermogravimetric analysis (TG), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), respectively. The results show that four SiBCN precursors are the viscosity of 198~275 mPa·S at room temperature and curing temperature of 120~235 ℃. The curing process of SiBCN precursors make double exothermic peaks. The kinetic parameters of SiBCN precursor P1, P2, P3, P4 are calculated by Kissinger, Ozawa and Crane equations depended on main exothermic peak, where the results are summarized as follows: Apparent activation energy are 96.9 kJ/mol, 88.4 kJ/mol, 119.5 kJ/mol, 268.2 kJ/mol with reaction order of 0.933, 0.930, 0.940, 0.943. The XRD results indicate that the ceramic product of P4 maintains amorphous structure by sintering at 1 300 ℃. The content of B in the ceramic product of P4 is 4.67% and decomposition temperature is higher than 1 650 ℃. The decomposition temperature shows a certain relationship with content of B in ceramic product of SiBCN precursors: The high-temperature stability of the ceramic product is effectively improved when the B content of SiBCN precursor exceeds a certain concentration.

Key words: SiBCN precursor, SiBCN ceramic, dehydrogenation, curing kinetics, high temperature resistance, composites

CLC Number:

TB332

PENG Zhe, YAO Lichao, CHAI Xiaoxiao, LI Song. Study on synthesis, curing kinetics and ceramic product’s properties of SiBCN ceramic precursor[J]. COMPOSITES SCIENCE AND ENGINEERING, 2024, 0(6): 15-21.

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