粉末冶金法制备SiCwAZ91复合材料研究

AbstractAbstractMagnesium alloy has the advantages of light-weight,high strength/weight ratio,high stiffess /weight ratio,high damping property and electromagnetism shieldingproperty and so on.It is regarded as the most promising green material of the 21stcentury.In recent years,it is one of important research fields on magnesium alloy formaterials scholars.Powder metallurgy method was used to fabricate SiCw reinforced AZ91 matrixcomposites 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 1wt.%silane coupling agent KH550)-absoluteethyl ethanol solution than 0.5g/L sodium pyrophosphate(SPP )aqueous solutionand 5%Tween 80(Tween80)-absolute ethyl ethanol solution.The reasonableproperties were obtained after dispersing in 1wt.%silane coupling agent KH550)-absolute ethyl ethanol solution.The composite materials were prepared in a vacuum hot pressing sintering.Theresults indicate that it is reasonable to sinter composites in 550'C,30KN and 300s.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 higer 33.3%than AZ91 matix.The main wear mechanism of the matrix AZ91 is abrasive wear and a littleadhesive wear and oxidative wear.The main wear mechanism of the no-diapersed20%SiCw/AZ91 is abrasive wear,the ware quantity is the maximum.The main wearmechanism of the diapersed 20%SiCw/AZ91 is abrasive wear and the adhesive ware,and thethe ware quantity is little,the matrix and the SiCw combines closely,and ithas the best hardness and the friction and wear properties.Keywords:SiCw;Powder metallurgy;Dispersant;Magnesium matrix composites;Property