| Magnesium alloy has the advantages of light-weight, high strength/weight ratio, high stiffness/weight ratio, high damping property and electromagnetism shielding property and so on. It is regarded as the most promising green material of the21st century. In recent years, it is one of important research fields on magnesium alloy for materials scholars.Powder metallurgy method was used to fabricate SiCw reinforced AZ91matrix composites in this research. The disperse modes of SiCw was studied. The hardness, tensile strength and frictional wear of acquired composites was analyzed respectively.SiCw was dispersed better in lwt.%silane coupling agent (KH550)-absolute ethyl ethanol solution than0.5g/L sodium pyrophosphate (SPP) aqueous solution and5%Tween80(Tween80)-absolute ethyl ethanol solution. The reasonable properties were obtained after dispersing in lwt.%silane coupling agent (KH550)-absolute ethyl ethanol solution.The composite materials were prepared in a vacuum hot pressing sintering. The results indicate that it is reasonable to sinter composites in550℃,30KN and300s.The composites are brittle so that their tensile performance is not very well, only52.92Mpa. The hardness was improved obviously with the highest micrhardness of95HV0.1. It is higer33.3%than AZ91matix.The main wear mechanism of the matrix AZ91is abrasive wear and a little adhesive wear and oxidative wear. The main wear mechanism of the no-diapersed20%SiCw/AZ91is abrasive wear, the ware quantity is the maximum. The main wear mechanism of the diapersed20%SiCw/AZ91is abrasive wear and the adhesive ware, and the the ware quantity is little, the matrix and the SiCw combines closely, and it has the best hardness and the friction and wear properties. |
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