作　　者： ; ; ; ; ; ;

机构地区： 中南大学材料科学与工程学院

出　　处： 《中南大学学报（自然科学版）》 2007年第2期232-237,共6页

摘　　要： 采用X射线衍射仪、金相显微镜和扫描电镜,研究了内氧法制备的Ag-Y2O3和Ag-CeO2材料的相组成和显微组织的演变,并测量了其密度、电阻率和硬度。结果表明:Ag-Y和Ag-Ce合金粉末经内氧化处理后生成Ag和稀土氧化物2种物相;Ag-Y2O3和Ag-CeO2材料烧结坯中氧化物颗粒分布不均匀且团聚严重,但材料经过大变形加工后,氧化物颗粒细小,均匀地弥散分布在银基体上;最终产品丝材的相对密度均达到99%以上,电阻率较低(<2.2μΩ.cm)。 The phase constitution, evolvement of microstructures of Ag-Y2O3 and Ag-CeO2 materials fabricated by internal oxidation were analyzed by X-ray diffractometry （XRD）, optic microscopy （OM） and scanning electron microscopy （SEM）, respectively. The density, electrical contact resistance and hardness of these two alloys were tested. The results show that Ag and rare earth oxide appear in Ag-Y and Ag-Ce alloy after internal oxidation. The distribution of oxide particles is inhomogeneous and seriously conglomerated in Ag-Y2O3 and Ag-CeO2 sintered bulk, but they are dispersed and uniform in Ag matrix after severe plastic deformation. The relative densities of wire materials are larger than 99% and the electrical contact resistances are low （〈2.2 μΩ .cm）.

关 键 词： 银稀土氧化物 电接触材料 内氧化 显微组织 物理性能

领　　域： [电气工程] [一般工业技术]