Journal
CERAMICS INTERNATIONAL
Volume 41, Issue 5, Pages 7185-7190Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2015.02.041
Keywords
PyC; BN; Dip-coating; Precursor infiltration and pyrolysis; SiCf/SiC composites
Categories
Funding
- National Nature Science Foundation of China [51372274]
- Aid program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
- Aid program for Innovative Group of National University of Defense Technology
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To tailor the fibre matrix interface of continuous-silicon-carbide-fibre-reinforced silicon carbide (SiCf/SiC) composites for improved mechanical properties, SiC fibres were coated with pyrolytic carbon (PyC) and BN interfaces using chemical vapour deposition (CVD) and the dip-coating process, and three-dimensional SiCf/SiC composites with such interfaces were fabricated using the precursor infiltration and pyrolysis (PIP) process. The microstructures of the SiC fibres with different coatings were characterised using a scanning electron microscope. The effects of the coating processes on the tensile strengths of the SiC fibres were studied using a single-filament tensile strength test. The mechanical properties of the SiCf/SiC composites were evaluated using the three-point bending test and single-edged notch beam test. The results indicate that the SiC fibres with single-layer PyC coating have larger single-filament tensile strengths than the original fibres. The SiCf/SiC composites with a single-layer PyC coating as an interface exhibit an optimal mechanical property. The average flexural strength and fracture toughness of the single PyC-coated composites were 433.1 MPa and 20.0 MPa m(1/2), respectively. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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