Study on Densification Characteristics of SiCp/2024 Aluminum Matrix Composites by Cold-pressing
Taking SiCp with double-particle size of 50 μm,10 μm and 2024 aluminum powder as raw materials,the compaction behavior and mechanism of mixed powders using uniaxial molding method under cold pressure of 102 MPa,204 MPa and 306 MPa were studied.SiCp/Al matrix composites with a total SiCp content of 20vol%were prepared by powder metallurgy and the microstructure and fracture characteristics of the composites after hot pressed sintering were studied.The results show that the density of the cold pressed billet and the composite increases with the increase of cold pressure,and the increase of the density of the cold pressed billet above 204 MPa is not obvious.Under the condition of 306 MPa cold pressure,the density of the cold pressed billet reaches 85.8%,and the density of the aluminum matrix composites after sintering reaches the maximum of 99.87%.The interfacial bonding between the two-particle SiCp and Al matrix is metallurgical bonding,and there is no SiC/Al interface disadhesion phenomenon and pore formation,and the transgranular fracture of SiCp occurs in the fracture of the composites,showing good interfacial bonding performance.
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