Studies on Vacuum Brazing (Report III) : Effect of manganese added in sliver-copper brazing alloy on brazability(Welding Physics, Process & Instrument)
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概要
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Vacuum brazing of stainless steel was studied on the effect of Mn addition in silver-copper brazing alloy on brazability. The improvement of brazability by the addition of Mn to brazing alloy was discovered on stainless steel surface (SUS304L, SUS321). The spread area increased with the increase of Mn amount in brazing alloy. Particularly, the improvement of spreadability was observed remarkably for SUS321 stainless steel, and pre-oxidized SUS304L stainless steel. The effect of Mn addition in brazing alloy on spreadability was considered as follows ; When Mn alloy was used, the grain boundary grooves were easily formed on the stainless steel surface during brazing and then the liquid brazing alloy impregnated them and spread easily on the surface. Because, H_20 and O_2 gas in vacuum atmosphere reduced due to vaporizing of Mn. So, the re-oxidation of stainless steel surface on which the oxide film was removed by vacuum heating was inhibited. Moreover, the deposition of Mn on stainless steel surface assisted the reduction of oxide. Then, the grain boundary grooves formed on such stainless steel surface.
- 大阪大学の論文
著者
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ARATA Yoshiaki
Osaka University
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OHMORI Akira
Osaka University
-
Cai Huai
Osaka University:beijing Aeronautical Manufacturing Technology Research Institute
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