Effects of Adding SiC Powder on the Properties of Carbon Fiber Reinforced Si-O-C Composites Fabricated via Precursor Pyrolysis

Abstract

Three dimensional carbon fiber reinforced silicon oxycarbide (3D Cf/Si-O-C) composites with low cost silicon resin as precursors and 3D Cf as reinforcement. Effects of adding SiC powder (SiCP) on the microstructure, mechanical properties and anti-oxidation properties of 3D Cf/Si-O-C composites were investigated. The results showed that adding SiCP filler could reduce the porosity and improve the interface bonding, therefore the properties of composites increased. But when the SiCP content was excessive, it was difficult to dense the matrix of composites at the further cycles and pores existed in the matrix. As a result, the mechanical properties of the composites decreased. It was found that when fabricated with 18.2 weight percent SiCP the composites exhibited highest mechanical properties, and the flexural strength and fracture toughness reached 421.3MPa and 13.0 MPa•m1/2, respectively. And the anti-oxidation properties were improved with the increase of the SiCP content. When fabricated with 25.0 weight percent SiCP the composites exhibited best oxidation resistance properties, and the composites retained 89.5% of original flexural strength.

SiOC Glass–Diamond Composites

“…) nor TEM observations could reveal any interphase between diamond particles and matrix. The addition of SiC powder to carbon fiber reinforced Si–O–C composites was found beneficial to the mechanical and physical (density) properties . Diamond particles might have a similar role in the present case.…”

“…The addition of SiC powder to carbon fiber reinforced Si-O-C composites was found beneficial to the mechanical and physical (density) properties. 24 Diamond particles might have a similar role in the present case. Increase in surface-to-volume ratio due to reduction in particle size may be one of the reasons explaining the difference in the bonding nature between the two particle size ( Figs.…”

“…However, in case of high diamond particle content, densification of the matrix becomes difficult and as a result, the mechanical properties of the samples decrease. Degradation of the mechanical properties due to excess amount of filler particles has been also reported in the literature for various types of materials …”

“…Degradation of the mechanical properties due to excess amount of filler particles has been also reported in the literature for various types of materials. 5,22,24…”