Abstract：Cf/SiC ceramic matrix composites were prepared byslurry brushing-needle punching-warm pressure curing- high temperature carbonization proces using SiC powders, alcohol-soluble phenolic resin powders, carbon fiber felt and carbon fibers weft free cloth as raw materials. The Cf/SiC porous preform was prepared by slurry brush coating, puncture, temperature pressure curing and high temperature carbonization. The volume fraction of phenolic resin in the slurry was respectively 10% and 15%, and temperature and pressure curing pressures was 8 MPa and 20 MPa, respectively. And then SiC was deposited by chemical vapor infiltration method to quickly prepare Cf/SiC ceramic matrix composites. The morphology and microstructure of the materials were observed and analyzed. The properties such as density, porosity, bending strength and fracture toughness of the materials were measured. The results show that the properties of Cf/SiC composites are better when the volume fraction of phenolic resin in the slurry is low, and the properties increase with the increase of curing pressure. When the volume fraction of phenolic resin was 10% and the curing pressure was 20 MPa, a high density Cf/SiC composite with open porosity of 13.1% is obtained. The matrix of Cf/SiC composite was relatively compact, and there was almost no pores between the fiber bundles and the matrix. When the composite was subjected to the applied load, the strength and toughness of the composite were improved by fiber pulling out, fiber debonding and crack deflection. The fracture mode of the composite was pseudoplastic fracture, with the highest bending strength and fracture toughness of 570 MPa and 18.6 MPa·m1/2, respectively.
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2022, Vol. 27 
