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龙飞,张冠星,何鹏,耿慧远.氧含量对银基粉状钎料熔化及钎焊特性的影响[J].稀有金属材料与工程(英文),2020,49(2):385~390.[Fei Long,Guanxing Zhang,Peng He and Huiyuan Geng.Effects of Oxygen Content on the Melting Characteristics and Brazing Mechanical Properties of Silver-based Powder Brazing Filler Metals[J].Rare Metal Materials and Engineering,2020,49(2):385~390.]
Effects of Oxygen Content on the Melting Characteristics and Brazing Mechanical Properties of Silver-based Powder Brazing Filler Metals
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Received:September 09, 2018  Revised:February 12, 2020
DOI:
Key words: Oxygen Content, Melting Characteristics, Mechanical Properties
Foundation item:国家自然科学基金(51975150,51805112)
Author NameAffiliation
Fei Long,Guanxing Zhang,Peng He and Huiyuan Geng  
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Abstract:
      In the brazing process, the powder brazing filler metal is widely used. It is often used not only in the production of some complicated workpieces but also in the process production of repair welding and incomplete penetration. Besides, it can also be used in automated production, with a promising future. Due to their large specific surface area, the silver-based powder filler metal easily suffers an increase in oxygen content. However, few systematic studies have been conducted on the effect of the oxygen content on the performance of silver-based powder brazing filler metals. In this study, both density functional theory (DFT) calculations and a variety of analytical methods were employed to study the effects of increased oxygen content on the melting characteristics and brazed joint mechanical properties. The results revealed that the apparent activation energy of the filler metal increased with the increasing oxygen content, resulting an increased melting time. The tensile strength of the brazed joints decreased nonlinearly with the increasing oxygen content in the filler metal. To ensure good performance of brazing filler metals, the filler metal oxygen content should be controlled to be less than 200 ppm. According to the fatigue testing results, the oxygen induced brazing defects severed as a source of fracture cracks. Our studies provided a detailed mechanism of the oxygen effects on the brazing process of the silver-based powder filler metals.