首页|Ag-Ni-La2Sn2O7复合材料在不同气氛中的耐电弧烧蚀性能及机理

Ag-Ni-La2Sn2O7复合材料在不同气氛中的耐电弧烧蚀性能及机理

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采用化学共沉淀法制备了 La2Sn2O7粉末,并使用真空热压烧结法制备出Ag-Ni-La2Sn2O7(85∶12∶3)复合材料.分别在空气、N2和SF6气氛中对Ag-Ni-La2Sn2O7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-La2Sn2O7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-La2Sn2O7复合材料在空气和N2气氛中烧蚀区域面积大、表面起伏小,在SF6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Ag2O、NiO、La2O3和SnO2,在N2气氛中由于O2-不足,电弧烧蚀后生成La2O3、NiO和部分SnO2,剩余部分Sn和Ag保持金属态,在SF6气氛中电弧烧蚀后金属元素被氟化,生成AgF、NiF2、LaF3和SnF4.
Anti-arc erosion capability and mechanism of Ag-Ni-La2Sn2O7 composites in different atmospheres
La2Sn2O7 powder was prepared by chemical coprecipitation method,and Ag-Ni-La2Sn2O7(85∶12∶3)composites were prepared by vacuum hot-pressing sintering method.Arc erosion experiments of the Ag-Ni-La2Sn2O7 composites were carried out in air,N2 and SF6 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-La2Sn2O7 composites in different atmospheres were analyzed.The results show that the Ag-Ni-La2Sn2O7 composites have a large erosion area and small surface roughness in air and N2 atmosphere,while the erosion area significantly decreases in SF6 atmosphere,accompanied by an increase in surface roughness.After arc erosion in an air atmosphere,all metal elements are oxidized,generating Ag2O,NiO,La2O3 and SnO2.In an N2 atmosphere,due to insufficient O2-,La2O3,Ni and some SnO2 are generated after arc erosion,while the remaining Sn and Ag remain in a metallic state.In an SF6 atmosphere,the metal elements are fluorinated after arc erosion,generating AgF,NiF2,LaF3 and SnF4.

Ag-Ni-La2Sn2O7 compositesdifferent atmospheresanti-arc erosion capabilityarc erosion mechanism

江宁远、凤仪、范贤捷、刘铸汉、于淼、张天源、王娟

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合肥工业大学材料科学与工程学院,安徽 合肥 230009

合肥职业技术学院机电工程学院,安徽合肥 230012

Ag-Ni-La2Sn2O7复合材料 不同气氛 耐电弧烧蚀性能 电弧烧蚀机理

国家自然科学基金2023年安徽省高校科研重大项目2023年合肥职业技术学院校级科研重点项目

518710852023AH0403402023RCKJA02

2024

材料热处理学报
中国机械工程学会

材料热处理学报

CSTPCD北大核心
影响因子:0.958
ISSN:1009-6264
年,卷(期):2024.45(9)
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