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摘要
A mixture of 0.1% graphene oxide and 0.5% ultrafine alumina particles (both mass fraction) were added to the copper powder for a mixed mechanical milling. Then the powders mixture was densified by vacuum hot pressing sintering technique and the thermal reduction of graphene oxide was realized at the same time. Graphene/ODS (G/ODS) copper matrix composites were prepared using graphene as the second reinforcement phase in the copper matrix composite. The effects of milling time on the microstructures and properties of Cu-0.5Al2O3-0.1GO composite before and after sintering were studied by SEM, XRD, Raman spectrum, mechanical properties test and physical properties test. The results show that the mechanical and physics properties both increase by increasing ball milling time (0-8 h). Graphene has a better combination and distribution in copper matrix with the 8-hour ball milling, which result in optimal comprehensive properties of sintered composites. The compression yield strength of G/ODS copper composite is 324MPa, 29.6% higher than that of ODS copper (250 MPa).The bending strength is 621 MPa, which is very near to that of ODS copper (629 MPa). The fracture mechanism of the composite is ductile fracture. The hardness, electric conductivity and thermal conductivity are 100 HV, 87.23%IACS and 385 W/(m?K), respectively. ? 2018, Editorial Office of Materials Science and Engineering of Powder Metallurgy. All right reserved.
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