SiO2/Fe-Ni composites were prepared by powder metallurgy method. The hardness,density and microstructure of the com-posites were tested. The results showed that the composites have high hardness and strength,low apparent density,and can thus basi-cally meet the requirements of light weight and high strength. Also,the"support effect" of matrix on the reinforced particles and the"reinforcement effect" of particles on the matrix are obvious. The small amount of pores near the interface and the low mechanical inter-locking force of the I-type interface are the main reasons for the collapse of the material.
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