Vacuum brazability of powder aluminum brazing filler metals.
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Vacuum brazability of aluminum was investigated using various Al-Si-Mg powder brazing filler metals made by atomization. The effects of atomizing atmosphere and powder size on brazability were studied. After brazing a part of used filler metals gave no contribution for the fillet formation and gathered on the base metal, showing non-wetting among filler metal powders. Brazability was evaluated by the percentage of the filler metal remaining as fillet by measuring the weight change before and after brazing. After brazing of the powder filler metal, voids were found in the formed fillet. Although the completely sound fillet was not obtained, the fine powders and air atomized powders gave better brazability than coarse powders and those atomized in argon gas atmosphere. The difference in vaporization characteristics of magnesium in the filler metals seemed to be responsible for the void formation and poor brazability of the powder filler metals. Mixing of the filler metals with the Al-Mg powder was found to be effective for the improvement of the fillet formation, however, completely sound fillet was not obtained. It is believed that both the control of magnesium vaporization rate and the improvement of quality of vacuum are important to obtain the sound fillet using powder filler metals.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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