کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1460465 | 989605 | 2015 | 6 صفحه PDF | دانلود رایگان |
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 m1/2, respectively.
Journal: Ceramics International - Volume 41, Issue 5, Part B, June 2015, Pages 7185–7190