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Mechanical properties of SiC_f/NiFe_2O_4 composite

ZHANG Shu-ting~(1,2),YAO Guang-chun~2(1.Institute of Metal Materials,Beijing General Research Institute of Mining and Metallurgy, Beijing 100044,China; 2.School of Materials and Metallurgy,Northeastern University,Shenyang 110004,China)  
The SiC_f/NiFe_2O_4 composite was prepared by the solid-state reaction.The effect of addition of SiC_f on the density,porosity,impact toughness and thermal shock resistance was studied.The results show that the mechanical properties of composite are improved considerably in comparison with that of the NiFe_2O_4 spinel.The impact toughness of specimen with 2%SiC_f is raised about 160%, the prevalent toughening mechanism operating in composites is debonding and pullout of fibers.The strength retention of specimen with 2%SiC_f is increased to 96% after thermal shock.The properties of specimen are appropriated when it contains 2%SiC_f in comprehensive consideration.The fiber/matrix interface plays a critical role in the determination properties.
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