Abstract
Cf/PyC/SiC-Si3N4 composites are fabricated using silazane modified phenol formaldehyde (SPF) as preceramic matrix resin, pyrocarbon (PyC) as interphase and 2D carbon fabric as reinforcement. The PyC interphase was deposited via chemical vapor infiltration (CVI) technique on the carbon fabric reinforcement and densified with matrix via polymer impregnation and pyrolysis (PIP) process. The changes in the SPF composition significantly affects the mechanical properties as shown by the changes observed in stress-strain behavior, flexural strength and flexural modulus. Cf/PyC/SiC-Si3N4 composites exhibited a gradual increase in flexural strength from 50 ± 6 MPa to 92 ± 5 MPa with change in SiC-Si3N4 composition. The fractography of Cf/PyC/SiC-Si3N4 composites were closely evaluated using optical microscope and scanning electron microscope techniques. The fracture behavior of the Cf/PyC/SiC-Si3N4 composites highlights fiber pull-out or partial delamination phenomenon depending on the SiC-Si3N4 composition. This study establishes silazane modified phenol formaldehyde as a potential preceramic matrix resin for the fabrication of Cf/PyC/SiC-Si3N4 composites to achieve improved mechanical properties for thermo-structural applications.
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