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闫涛,刘贵民,朱硕,杜林飞.MoW喷涂层导电性及电弧烧蚀试验研究[J].稀有金属材料与工程(英文),2019,47(3):953~959.[YAN Tao,LIU Gui-min,ZHU Shuo and DU Lin-fei.Research on Conductivity and Arc Erosion Test of MoW Coating[J].Rare Metal Materials and Engineering,2019,47(3):953~959.]
Research on Conductivity and Arc Erosion Test of MoW Coating
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Received:July 30, 2017  Revised:September 05, 2017
Key words: MoW coating  supersonic plasma spraying  conductivity  arc erosion
Foundation item:北京市自然科学基金资助(2152031),重点实验室资助(9140C8502010C85)
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YAN Tao,LIU Gui-min,ZHU Shuo and DU Lin-fei  
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      MoW coating was prepared by supersonic plasma spraying technology on 45CrNiMoVA steel. The bonding strength of the coating were tested. The electrical conductivity of the coating was tested by resistance tester. The arc erosion test of MoW coating with different discharge current in atmosphere was carried out by using high voltage arc device. The coating structure was analyzed by field emission scanning microscope (SEM) and electron spectrometer (EDS), and the phase composition of the coating was tested by X ray diffractometer. The results show that the MoW coating prepared by the supersonic plasma spraying process has good adhesion with the substrate, and the conductivity is 6.12%IACS. The addition of W improves the chemical defect ratio of coating and leads to the decrease of conductivity. Porosity is one of the main reasons for low conductivity of coating. The oxidation has little influence on the conductivity of MoW coating. As the discharge current increases, the MoW coating arc erosion area increased significantly; the current size of the errosion coating reflects two different errosion morphology; the greater the porosity, surface roughness, arc erosion resistance of the coating performance worse. The arc erosion resistance of MoW coating is better than that of pure Mo coating.