摘要
用 TGA 技术研究了 Ag_(57)Cu_(38)Ti_5活性钎料在873K 流动空气中氧化的动力学规律,并用 X射线能谱分析(EDAX)和 X 射线衍射分析研究了氧化产物的化学组成和相结构。结果表明,这种Ag 基活性钎料的氧化动力学规律精确地服从抛物线定律,在873K 时抛物线速率常数为6.29×10^(-5)mg^2cm^(-4)s^(-1)。氧化膜由 Cu_2O 和 CuO 两相组成,其中溶有少量的 Ag。与 Ag-Cu 共晶钎料的氧化性能对比,发现钎料中含有少量的 Ti,对钎料在高温下的氧化抗力不利。
Oxidation kinetics behavior of Ag_(57)Cu_(38)Ti_5 active brazing filler metal forjoining ceramics was studied by TGA,EDAX and X-ray diffraction.The results show thatthe oxidation kinetics of the Ag-base active brazing filler metal precisely conform to theparabolic law.The parabol rate constant of the alloy at 873K in a flow air is 6.29×10^(-5)mg^2cm^(-4)s^(-1).The oxidation film of the alloy consists of Cu_2O and CuO with small Ag.As a comparison with Ag-Cu eutectic brazing filler metal,it is found that the Ag-base al-loy with small Ti has a poor inherent oxidation resistance at high temperature.Finally,it issuggested that it would need to improve the oxidtion resistance of the Ag-base active braz-ing fiUer metal by adding other elements without sacrificing its good wettability onceramics.
基金
国家自然科学基金
5860356
关键词
钎焊
钎料
氧化性
陶瓷
Ag基
合金
joining of ceramic-metal
brazing
active brazing filler metal
oxidation
Ag-base alloy
