烧结Ag-ZnO(8)电触头的性能和显微结构

PROPERTIES AND MIGROSTRUCTURES OF SINTERED Ag-ZnO(8)ELECTRICAL CONTACTS

探讨了机械混合,化学共沉淀两种制粉方法和压制、烧结等工艺参数及添加元素对Ag-ZnO(8)材料基本性能和显微结构的影响。对采用不同制粉方法,含有不同添加元素的Ag-ZnO(8)电触头的通断能力、温升、电弧腐蚀率、抗熔焊性及电弧对触头表面结构的影响作分析比较。结果表明,采用化学共沉淀法制粉,添加少量镍的Ag-ZnO(8)电触头材料的基本性能和电性能最佳。

The present work has studied the effect of two methods for making mixture powder by mechanical mixing and by chemical coprecipitation, pressing, sintering and other technological parameters as well as addition elements on the basic properties and the microstructures of Ag-ZnO(8) materials.The making and breaking capacity,temPerature rise, the arc erosion rate and the resistivity agAlNst welding of the Ag-ZnO(8) electrical contacts made by different methods and contAlNing different addition elements have been analysed and compared each other. The effect of the eletrical arc on the surface structure of contacts has been also analysed. It is found that the basic properties and the electrical performance of the material for Ag-ZnO(8) contacts can be optimized by adopting the chemical coprecipitation method and by adding a little content of nickel.