Abstract：Phosphate slurries were prepared using aluminum dihydrogen phosphate solution and Al2O3/ZrO2. Cf/phosphate composites with phosphate as matrix and carbon fiber as reinforcing phase were prepared by paste brushing carbon fibers-laminated needling-hot pressing-vacuum impregnation-hot pressing densification process. The microstructure and phase of the composites were characterized by scanning electron microscopy and X-ray diffraction analysis. The properties of the composites such as density, open porosity and flexural strength were measured, and the effects of Al2O3 content and ZrO2 on the green body and composites were studied. The results show the highest density of Cf/phosphate composites reaches 2.27 g/cm3, and the lowest open porosity is 13.4%. The oxide content affects the mechanical properties of the composites. When m(Al(H2PO4)3):m(Al2O3):m(ZrO2) is 200:100:10, the average flexural strength of the composite is 122 MPa, and the flexural strength of the composite is 38 MPa after treatment at 600 ℃ for 30 min.
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2022, Vol. 27 
