In this study, the amorphous C, ZrB 2 , and BN single-layer coatings as well as C/ BN, C/ZrB 2 , ZrB 2 /BN, and C/ZrB 2 /BN composite coatings were prepared on SiC fibers (SiC f ) by an in situ synthesis and solution impregnation-pyrolysis method.Subsequently, SiC f /SiBCN composites were fabricated by hot-pressing sintering at 1900℃/60 MPa/30 min to explore the influence of different coatings on the microstructure and mechanical performance of resulting composites. After the preparation of single-layer-coated SiC f , the SiC f (BN) or SiC f (ZrB 2 ) tended to be overlapped with each other, whereas the dispersion of amorphous C-coated SiC f was satisfying. Besides, some uneven areas and attached particles have appeared on fiber surfaces of the SiC f (BN) or SiC f (ZrB 2 ), whereas smooth and dense surfaces of amorphous C-coated SiC f were observed. Because the uniformity of ZrB 2 coatings can be partially damaged by the subsequent coating process of BN, the composite coatings of ZrB 2 /BN and C/ZrB 2 /BN were thereby not suitable for strengthening SiBCN matrix. The SiC f /SiBCN composites with C/ZrB 2 coatings have desirable comprehensive mechanical properties. Nevertheless, the conventional toughening mechanisms such as fiber pull-out and bridging, and crack deflection are not available for these composites because the serious crystallization of SiC f leading to great strength loss, resulting in catastrophic brittle fracture.
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