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根据真空扩散焊接工艺的要求,在研究异种材料的真空扩散焊接时采用了自制的EK—20型真空扩散焊机,其结构如图1所示。试验所焊材料有三种组合。第一组为铜+铝+铜,采用工业纯铜板和铝板,试件尺寸铜为60×100×2毫米,铝为60×100×6毫米,焊接面积为60×100毫米~2。焊前将试件进行真空退火处理。退火规范:铜板为600～650℃,保温1小时;铝板为350～400℃,保温1小时。由于焊件接触表面的状态对扩散焊的质量有很大影响,所以铝板经过机械加工,并仔细清除铜和铝表面上的氧化膜,再用丙酮进行脱脂处理即可入炉焊接。第二组为铜+陶瓷+铜,其中铜
According to the requirement of vacuum diffusion welding process, a vacuum Evaporative EK-20 welding machine made by ourselves is used in the research of vacuum diffusion welding of dissimilar materials. The structure is shown in Fig.1. There are three combinations of test materials to be welded. The first group is copper + aluminum + copper, the use of industrial pure copper and aluminum, the specimen size copper 60 × 100 × 2 mm, aluminum 60 × 100 × 6 mm, the welding area of 60 × 100 mm ~ Before welding the specimen is vacuum annealed. Annealing specifications: copper is 600 ~ 650 ℃, heat 1 hour; aluminum 350 ~ 400 ℃, heat 1 hour. Since the state of the weldment contact surface has a great influence on the quality of diffusion welding, the aluminum plate is machined and the oxide film on the copper and aluminum surfaces carefully removed, and then degreased with acetone for welding. The second group of copper + ceramic + copper, copper