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王博锋,胡旭华,周冠丽,周健勇,张永清,张兆传.电子枪零件钽钼激光焊接显微结构和性能分析[J].稀有金属材料与工程(英文),2020,49(5):1567~1575.[Bofeng Wang,Xuhua Hu,GuanLi Zhou,Jianyong Zhou,Yongqing Zhang and 中国科学院电子学研究所.Microstructures and Properties of Tantalum and Molybdenum Laser Welding for Electron Guns[J].Rare Metal Materials and Engineering,2020,49(5):1567~1575.]
Microstructures and Properties of Tantalum and Molybdenum Laser Welding for Electron Guns
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Received:January 01, 2019  Revised:March 06, 2019
DOI:
Key words: Tantalum  Molybdenum  pure Pt filler wire  laser welding  microstructures  properties
Foundation item:国家自然科学基金项目(面上项目), Grant no.61771454
Author NameAffiliation
Bofeng Wang,Xuhua Hu,GuanLi Zhou,Jianyong Zhou,Yongqing Zhang and 中国科学院电子学研究所  
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Abstract:
      Tantalum(Ta)/Molybdenum(Mo) dissimilar joint was successfully joined by laser welding process with pure Pt filler wire. The weld surface morphology, microstructure, interface element distribution, fracture morphology, phase structure, electrical performance and environment adaptability were studied by metallography microscope, scanning electron microscopy, hardness and mechanical properties of joints, X-ray diffraction, electron micro-hardness and tensile test, vibrationStable and ultra-high high vacuum system. Laser parameters have profound effects on microstructures of the laser-welded joints. Pores were generated in the weld zone caused by the preferential vaporization of pure Pt filler metal. The weld zone mainly contained TaPt2, TaPt3 and MoPt phase, resulting higher hardness in the weld zone than that of base metal. The joint fracture surface exhibited typical brittle fracture morphology. The electrical property and vibration test had examined the joints welding quality for electron guns. Meanwhile, the reliability of laser welding process in the development, production, and application of microwave tubes had been verified.