电子枪零件钽钼激光焊接显微结构和性能分析  

Microstructures and Properties of Tantalum and Molybdenum Laser Welding for Electron Guns

作　　者：王博锋[1,2] 胡旭华 周冠丽[1] 周健勇 张永清[1] 张兆传[1] Wang Bofeng;Hu Xuhua;Zhou Guanli;Zhou Jianyong;Zhang Yongqing;Zhang Zhaochuan(Key Labouratory of Science and Technology on High Power Microwave Sources and Technologies,Institute of Electronics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院电子学研究所中国科学院高功率微波源与技术国防科技创新重点实验室,北京100190 [2]中国科学院大学,北京100149

出　　处：《稀有金属材料与工程》2020年第5期1567-1575,共9页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China (61771454)。

摘　　要：采用脉冲固体激光器对电子枪零件钼和钽进行激光焊接工艺试验,利用金相显微镜、扫描电镜、万能材料试验机、电子显微硬度分析仪、X射线衍射仪、振动台、电子枪真空除气系统等研究了电子枪金属零件焊缝焊接表面成形、接头区域的组织形貌、界面元素分布、断口形貌、显微硬度与接头力学性能、焊接接头物相、电子枪振动冲击性能及工作状态下电性能和热性能。结果表明,优化焊接参数后焊接的电子枪经受了在微波管中连续高温工作的考验。振动冲击试验和电子枪性能试验检验了电子枪组件的焊接牢固程度和焊接质量,验证了激光焊接工艺在小批量微波管研制、生产和应用过程中的可靠性。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 electronic universal test machine,X-ray diffraction,electron micro-hardness and tensile test,vibration table 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 in higher hardness in the weld zone than that of base metal.The joint fracture surface exhibited typical brittle fracture morphology.The electrical property and environment test examined the joints welding quality for electron guns.Meanwhile,the reliability of laser welding process in the development,production,and application of microwave tubes was verified.

关 键 词：钽 钼 铂 激光焊接 显微结构 性能 

分 类 号：TG456.7[金属学及工艺—焊接]