Fe掺杂对纳米Ag-SnO_2电接触合金润湿性及电性能的影响  

Effect of Fe doping on wettability and properties of Ag-SnO_2 electrical contact alloys

作　　者：付翀[1,2] 姜凤阳[2] 王俊勃[2] 杨敏鸽[2] 刘英[2] 蒋百灵[1] 

机构地区：[1]西安理工大学材料科学与工程学院,西安710048 [2]西安工程大学机电工程学院,西安710048

出　　处：《粉末冶金材料科学与工程》2010年第4期362-366,共5页Materials Science and Engineering of Powder Metallurgy

基　　金：陕西省科学技术研究发展计划资助项目(2007K06-09);西安市产学研促进工程-工业应用技术研发项目(CXY08001(4));陕西省教育厅专项科研计划资助项目(07JK259;09JK446);西安工程大学基础研究基金资助项目(2010JC10)

摘　　要：采用座滴法研究Fe掺杂对Ag与纳米SnO2之间润湿性的影响,进一步利用化学共沉淀和常压烧结法制备掺杂Fe元素的Ag-SnO2电接触合金,对该合金进行耐电压和模拟电弧侵蚀试验,并通过冷场发射扫描电镜(FESEM)及X射线能谱仪(EDS)分别对其在电弧侵蚀前后的形貌和成分进行观察和分析。结果发现,Fe的加入使Ag与纳米SnO2之间的润湿性提高,但掺杂含量达到一定值(Sn与Fe的原子比为14:5)后,增加掺杂量对润湿角影响不大。所制备的电接触合金呈现纳米第二相弥散均匀地分布在Ag基体中;随掺杂元素Fe含量增加,合金的耐电压强度提高,表面发生的局部熔化和Ag液集中喷溅现象明显减轻。Wettability of Ag on nanosized SnO2 with different Fe content was measured by sessile drop method.Fe-doped nanocomposite Ag-SnO2 electrical contact alloys were prepared by chemical coprecipitation,high-energy ball milling and sintering technique.The effects of Fe doping on properties including microstructures,breakdown strength and arc erosion of electrical contact alloys were investigated.Results show that Fe doping leads to obvious improvement of the wettability of Ag on nano-SnO2,but contact angle has not change obviously with Fe content increasing.The nano-scaled second phase particles disperse evenly in silver matrix of nanocomposite contacts alloys.The breakdown strength of electrical contact alloys increases with doping concentration increasing,and the splash of Ag is slight.

关 键 词：FE掺杂 纳米复合Ag-SnO2 润湿性 耐电压强度 电弧侵蚀 

分 类 号：TG146.4[一般工业技术—材料科学与工程]