Microstructural and Mechanical Characterization of SiBNC Coated Carbon Fibers Prepared via PIP Method

Abstract

The preparation of SiBNC ceramic oxidation-resistant coating on carbon fiber via precursor-solution infiltration and pyrolysis (PIP) method was presented and discussed in detail. Moreover, the microstructures and the components of the coating were characterized. The experiment results showed that the 0.5% polyborosilazane (PBSZ) solution in the coating preparation gave fewer defects, in contrast with the 1% and the 5% PBSZ solutions. The strength of the carbon fiber coated with SiBNC-0.5wt%(3.08GPa) was decreased by 12%. Compared with uncoated carbon fiber, the starting oxidation temperature and the reaction activation energy of the coated carbon fibers (SiBNC-0.5wt%) have increased by about 300 °C and 104%, respectively. The oxidation resistance of the SiBNC coated carbon fiber was improved dramatically.

Keywords

SiBNC coating / mechanical properties / microstructure / carbon fiber / oxidation resistant

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