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Research on laser surface cladding of tungsten cathode with Ni60A Alloy powders

Lan LANPing GAOChun-xia YANGXin-ming HE

Inner Mongolia Metal Materials Institute

摘要:Ni60 A alloy cladding coating was fabricated on tungsten cathode substrate by laser cladding to improve the local corrosion resistance of the tungsten cathode.The microstructure morphology,phase constitution,phase distribution and the micro-zone composition were measured and analyzed by OM,SEM,XRD,EDS,respectively.In the paper through static corrosion test,gravimetric analysis,XRD test,and SEM observation of molten salt corrosion morphology,the anti-molten salt corrosion mechanism of the coating was analyzed.The results indicated that the cladding coating had good metallurgical bonding with the substrate.The cladding coating had good convection and diffusion with matrix element.The surface of tungsten cathode produces a loose and non-protective oxidation film,which cannot effectively prevent the internal diffusion of O2 and the external diffusion of F2,accelerating the corrosion of tungsten cathode.The cladding coating has excellent corrosion resistance to molten salt,and its corrosion products are LiCrO2,Li2 CrO4,Li3 CrO4 and bonding phase Nd2(CO33,LiNdSiO4 and NdCrO4.
会议名称:

2018国际防务技术大会(ICDT)

会议时间:

2018-10-21

会议地点:

中国北京

  • 专辑:

    工程科技Ⅰ辑; 工程科技Ⅱ辑

  • 专题:

    金属学及金属工艺; 航空航天科学与工程; 武器工业与军事技术

  • 分类号:

    V252;TJ04;TG146.15

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