Abstract：B4C particles modified C/C-SiC composites were prepared by slurry infiltration combined with precursor infiltration and pyrolysis. The effect of the addition of B4C particles on the mechanical properties of C/C-SiC composites was investigated. The results show that,the flexural strength and fracture toughness of B4C particles modified C/C-SiC composites are 250.41 MPa and 13.56 MPa·m1/2, respectively. Compared with C/C-SiC composites, the flexural strength decreases by 45.5%, the toughness increases by 46.0%. The B4C particles can promote the sintering of SiC matrix. However, the bending strength of the composites decrease due to the formation of a large number of closed pores and weak interfaces of the matrix. The main reason for the improvement of the fracture toughness of the C/C-SiC composites modified by B4C particles is that the weak interface between B4C particles and SiC matrix make the cracks deflect effectively in the SiC matrix, increase the propagation path of the cracks in the matrix, and improve the fracture toughness of the composites.
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2019, Vol. 24 
