Abstract
Two-dimensional plain-weave silicon carbide fiber fabric reinforced silicon carbide (2D-SiC/SiC) composites were molded by stacking method and densified through precursor infiltration and pyrolysis (PIP) process. SiC coating was deposited as the fiber/matrix interphase layer by chemical vapor deposition (CVD) technique. Fiber/matrix debonding and relatively long fiber pullouts were observed on the fracture surfaces. Additionally, the flexural strength and elastic modulus of the composites with and without fiber/matrix interphase layer were investigated using three-point bending test and single-edge notched beam test. The results show that the fiber fraction and the porosity of 2D-SiC/SiC composites with and without coating are 27.2% (volume fraction) and 11.1%, and 40.7% (volume fraction) and 7.5%, respectively. And the flexural strength and elastic modulus of 2D-SiC/SiC composites with and without coating are 363.3 MPa and 127.8 GPa, and 180.2 MPa and 97.2 GPa, respectively. With a proper thickness, the coating can effectively adjust the fiber/matrix interface, thus causing a dramatic increase in the mechanical properties of the composites.
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Foundation item: Project(NCET-07-0228) support by the New Century Excellent Talents in University
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Yu, Hj., Zhou, Xg., Wang, Hl. et al. Processing and properties of 2D SiC/SiC composites by precursor infiltration and pyrolysis. J. Cent. South Univ. Technol. 16, 190–194 (2009). https://doi.org/10.1007/s11771-009-0032-4
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DOI: https://doi.org/10.1007/s11771-009-0032-4