MICRON SILVER PARTICLE-REINFORCED 316L STAINLESS STEEL MATRIX COMPOSITE MATERIAL AND PREPARATION METHOD THEREFOR

摘要

A micron silver particle-reinforced 316L stainless steel matrix composite material, comprising a 316L stainless steel matrix and silver particles that are uniformly distributed in the 316L stainless steel matrix; the silver particles account for 1-5% of the total weight of the composite material; and the density of the composite material is 7.9-8.2 g/cm3, and the compactness is above 98%. A preparation method therefor comprises: using spherical silver powder and spherical 316L stainless steel powder as raw materials, mixing same and then performing mechanical ball milling to obtain a mixed powder; after sieving, adding the mixed powder to a powder cylinder of an SLM forming machine; then, introducing an inert protective gas for printing, and obtaining said material. The silver particles are uniformly distributed in the 316L stainless steel matrix by means of SLM technology, the process is simple, time is saved, costs are low, and the prepared composite material has excellent electrical conductivity and corrosion resistance. The present invention is suitable for fuel cell bipolar plates and like technical fields having high requirements for corrosion resistance and electrical conductivity.