A silicon carbide particle reinforced aluminum matrix composite material and a method for producing the same

Abstract

The application discloses a kind of silicon carbide particle reinforced aluminum matrix composite and preparation method thereof, for the problem of interface reaction and big thermal mismatch stress easily occurring in selective laser melting (SLM) forming, the preparation method provided by the application comprises: high-temperature oxidation (900-1200 ℃, 2-6 h) is carried out to SiC raw material, so that its corner is passivated and in-situ generates 0.5-3 μm thick amorphous SiO2 continuous layer;Modified SiC particles are mixed with AlSi10Mg alloy powder to obtain composite powder with a SiC volume fraction of 15%-20%;Finally, SLM process is used to scan and melt layer by layer forming.The application uses amorphous SiO2 layer as a physical barrier, effectively inhibits the generation of brittle Al4C3 harmful phase, and significantly buffers the thermal mismatch stress.The method is simple in process, effectively eliminates the stress concentration of particle tip, greatly improves the density and comprehensive mechanical properties of the formed part.

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