低温烧结纳米掺杂Ag-SnO2电接触合金放电性能研究∗

摘要

The Fe-doped nanocomposite Ag-SnO2 contact alloys were prepared by chemical co-precipitation method,high-energy ball milling,hot pressing and sintering technique.The density,hardness,resistivity, brakdown strength and electrical arc erosion of alloys were measured,and the microstructures of the nanocom-posite contact alloys were analyzed by field emission scanning electron microscopy (FESEM).Results show that the nanosized of SnO2 particles were refined doped with Fe,when Fe concentration increases,the size of oxide particles in nanocomposite Ag-SnO2 contact decreases further,and the microstructures of alloys are more ho-mogenous and fine.Meanwhile the hardness,resistivity,average filed strength and arcing life of nanocomposite Ag-SnO2 contact increase,but its the current chopping value decrease.While the Fe-doping concentration has obviously influence on the arc ablation rate of nanocomposite electrical contact alloys.%利用化学共沉淀、高能球磨技术及热压烧结等方法制备出 Fe 掺杂纳米复合 Ag-SnO2电接触合金,测定了纳米复合电接触合金密度、硬度、电阻率、耐电压强度、耐烧蚀性等基本物理性能,运用扫描电镜(SEM)对电性能测试前后组织进行观察分析。结果发现,Fe元素的加入,细化了纳米 SnO2；Fe 掺杂含量越多,纳米氧化物粒度越小,纳米复合电接触合金组织也越细小均匀,纳米复合电接触材料硬度、电阻率、平均耐电压强度和电弧寿命上升,截流值降低；且 Fe 掺杂对纳米复合电接触合金电弧烧蚀速率有明显影响。