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《High Voltage Engineering》 2009-01
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Influences of HF Acid Eroding Treatment on Surface Insulation Performances of Machinable Ceramics

LIU Guo-qing,YU Kai-kun,TIAN Jie,ZHANG Guan-jun(State Key Laboratory of Electrical Insulation and Power Equipment,Xi'an Jiaotong University,Xi'an 710049,China)  
Machinable ceramic,as a new kind of material that is composed of crystal phase and glass phase,has an excellent performance on machining and dielectric property.We prepared different machinable ceramic sample.The different glass-phase contents on surface of samples treated by hydrofluoric(HF) solutions of diverse concentrations affect their flashover characteristics in vacuum.The proportions of crystal to glass phase are measured by X-ray diffract meter(XRD),and their flashover characteristics are also investigated.It is found that the influences on flashover characteristics are closely associated with the concentrations of HF solutions;the higher concentration the HF solution is,the lower glass-phase content and better flashover characteristic samples will perform.The treatment on machinable ceramics by HF can partly erode the glass-phases of sample surface,which changes the flashover heights of free electrons and hence influences the surface insulation performances of machinable ceramics in vacuum.
【Fund】: 国家自然科学基金(50777051)~~
【CateGory Index】: TQ174.1
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