In the present work investigations have been made to see the role of metal oxides on the performance of the silver metal oxides electrical contact materials. Silver metal oxide materials of three different composition...In the present work investigations have been made to see the role of metal oxides on the performance of the silver metal oxides electrical contact materials. Silver metal oxide materials of three different compositions Ag-10CdO, Ag-7.6SnO2-2.3ln2O3 and Ag-10ZnO were prepared by internal oxidation process under identical processing conditions. These materials were tested for electrical conductivity, hardness, and erosion loss. Performing an accelerated test on the actual contactor assessed the electrical performance, involving erosion loss and temperature rise of the processed materials. The arc-eroded surface was characterized under scanning electron microscope. The study of the eroded surfaces of contacts indicates that the thermal stability of metal oxides depends on nature of silver-metal oxide interface and their mode of erosion. An attempt is made to correlate the surface features of the eroded contacts with the thermal stability of metal oxides.展开更多
对触头材料的熔渗机理、熔渗过程进行了详细的分析 ,并以制造 Cu Cr50和 Cu W系触头为例 ,提出了确定触头材料熔浸过程工艺参数的原则和方法 :确定烧结工艺参数时要兼顾氧化膜的去除、保证骨架强度和孔隙通道 ,要考虑不同粉末粒径及生...对触头材料的熔渗机理、熔渗过程进行了详细的分析 ,并以制造 Cu Cr50和 Cu W系触头为例 ,提出了确定触头材料熔浸过程工艺参数的原则和方法 :确定烧结工艺参数时要兼顾氧化膜的去除、保证骨架强度和孔隙通道 ,要考虑不同粉末粒径及生坯特性 ;而确定熔渗工艺参数时则要考虑骨架金属粉末的粒径、生坯的高度、牌号及熔渗剂熔点。展开更多
文摘In the present work investigations have been made to see the role of metal oxides on the performance of the silver metal oxides electrical contact materials. Silver metal oxide materials of three different compositions Ag-10CdO, Ag-7.6SnO2-2.3ln2O3 and Ag-10ZnO were prepared by internal oxidation process under identical processing conditions. These materials were tested for electrical conductivity, hardness, and erosion loss. Performing an accelerated test on the actual contactor assessed the electrical performance, involving erosion loss and temperature rise of the processed materials. The arc-eroded surface was characterized under scanning electron microscope. The study of the eroded surfaces of contacts indicates that the thermal stability of metal oxides depends on nature of silver-metal oxide interface and their mode of erosion. An attempt is made to correlate the surface features of the eroded contacts with the thermal stability of metal oxides.
文摘对触头材料的熔渗机理、熔渗过程进行了详细的分析 ,并以制造 Cu Cr50和 Cu W系触头为例 ,提出了确定触头材料熔浸过程工艺参数的原则和方法 :确定烧结工艺参数时要兼顾氧化膜的去除、保证骨架强度和孔隙通道 ,要考虑不同粉末粒径及生坯特性 ;而确定熔渗工艺参数时则要考虑骨架金属粉末的粒径、生坯的高度、牌号及熔渗剂熔点。
