Ag-Ni-La_(2)Sn_(2)O_(7)复合材料在不同气氛中的耐电弧烧蚀性能及机理  

Anti-arc erosion capability and mechanism of Ag-Ni-La_(2)Sn_(2)O_(7)composites in different atmospheres

作　　者：江宁远 凤仪[1] 范贤捷 刘铸汉 于淼 张天源 王娟 JIANG Ning-yuan;FENG Yi;FAN Xian-jie;LIU Zhu-han;YU Miao;ZHANG Tian-yuan;WANG Juan(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China;School of Mechanical and Electrical Engineering,Hefei Technology College,Hefei 230012,China)

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009 [2]合肥职业技术学院机电工程学院,安徽合肥230012

出　　处：《材料热处理学报》2024年第9期39-54,共16页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51871085);2023年安徽省高校科研重大项目(2023AH040340);2023年合肥职业技术学院校级科研重点项目(2023RCKJA02)。

摘　　要：采用化学共沉淀法制备了La_(2)Sn_(2)O_(7)粉末,并使用真空热压烧结法制备出Ag-Ni-La_(2)Sn_(2)O_(7)(85∶12∶3)复合材料。分别在空气、N_(2)和SF_(6)气氛中对Ag-Ni-La_(2)Sn_(2)O_(7)复合材料进行电弧烧蚀实验,通过热场发射扫描电镜(SEM)和三维激光共聚焦扫描显微镜(3D LSCM)对复合材料烧蚀后的表面形貌进行分析,使用能谱仪(EDS)和X射线光电子能谱(XPS)对烧蚀后的样品成分进行分析。分析了Ag-Ni-La_(2)Sn_(2)O_(7)复合材料在不同气氛中的电弧烧蚀行为及机理。结果表明:Ag-Ni-La_(2)Sn_(2)O_(7)复合材料在空气和N_(2)气氛中烧蚀区域面积大、表面起伏小,在SF_(6)气氛中烧蚀区域面积显著缩小,伴随的是表面起伏程度增大。在空气气氛中电弧烧蚀后金属元素均被氧化,生成Ag_(2)O、NiO、La_(2)O_(3)和SnO_(2),在N_(2)气氛中由于O~(2-)不足,电弧烧蚀后生成La_(2)O_(3)、NiO和部分SnO_(2),剩余部分Sn和Ag保持金属态,在SF_(6)气氛中电弧烧蚀后金属元素被氟化,生成AgF、NiF_(2)、LaF_(3)和SnF_(4)。La_(2)Sn_(2)O_(7)powder was prepared by chemical coprecipitation method,and Ag-Ni-La_(2)Sn_(2)O_(7)(85∶12∶3)composites were prepared by vacuum hot-pressing sintering method.Arc erosion experiments of the Ag-Ni-La_(2)Sn_(2)O_(7)composites were carried out in air,N_(2)and SF_(6)atmospheres,respectively.The surface morphology of the composites after arc erosion was analyzed by thermal field emission scanning electron microscopy(SEM)and three-dimensional laser confocal scanning microscopy(3D LSCM),and the composition of the samples after arc erosion was analyzed using energy dispersive spectrometer(EDS)and X-ray photoelectron spectroscopy(XPS).The behavior and mechanism of arc erosion of the Ag-Ni-La_(2)Sn_(2)O_(7)composites in different atmospheres were analyzed.The results show that the Ag-NiLa_(2)Sn_(2)O_(7)composites have a large erosion area and small surface roughness in air and N_(2)atmosphere,while the erosion area significantly decreases in SF_(6)atmosphere,accompanied by an increase in surface roughness.After arc erosion in an air atmosphere,all metal elements are oxidized,generating Ag_(2)O,NiO,La_(2)O_(3)and SnO_(2).In an N_(2)atmosphere,due to insufficient O_(2-),La_(2)O_(3),Ni and some SnO_(2)are generated after arc erosion,while the remaining Sn and Ag remain in a metallic state.In an SF_(6)atmosphere,the metal elements are fluorinated after arc erosion,generating AgF,NiF_(2),LaF_(3)and SnF_(4).

关 键 词：Ag-Ni-La_(2)Sn_(2)O_(7)复合材料 不同气氛 耐电弧烧蚀性能 电弧烧蚀机理 

分 类 号：TB333[一般工业技术—材料科学与工程]