Abstract：In this paper, SiC and ZrC powders were used as raw materials to prepare a water-based ceramic slurry with a volume fraction of 30% solid content. Slurry injection method and vacuum impregnation method were used to introduce slurry into the carbon fiber preform with a density of 0.2 g/cm3. Combined with chemical vapor infiltration and reactive melt infiltration, Cf/SiC-ZrC composites were prepared. The morphology and microstructure of the blank and Cf/SiC-ZrC composites were observed and analyzed. The density, porosity, bending strength and oxidation resistance of the composites were measured. The results show that, compared with the vacuum impregnation method, the SiC and ZrC powders can be uniformly introduced into the carbon fiber preform by slurry injection method, and the green body volume is filled by 37.3% at one time. The average density of the injected composites is 2.91 g/cm3, and the bending strength of the center and outer layer of the composites is 41.12 MPa and 43.90 MPa, respectively. The fracture modes of the composites are all pseudoplastic fracture. After oxidation in air for 120 min, a relatively continuous and dense oxide layer is formed on the surface of the injected composite. Oxidation tends to be balanced and stable, the samples show good antioxidant properties.
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2022, Vol. 27 
