水素雰囲気中における金属粉末塗布軟鋼板上の銀ろうの広がり : 接点材料の銀ろう付性に関する研究(第 2 報)

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Wetting phenomenon of steel (SPC) covered with powder metals by BAg filler metals was studied in hydrogen atmosphere. The wettability was measured by spread test, and the wetting mechanism was investigated by SEM and EPMA technique. Main results obtained were as follows. 1) On SPC covered with powder metals, the spread area of BAg-5 and BAg-8 is several ten times as large as that without powder. 2) Spread area is related to the mass of powder, and the smaller is the powder size, the larger the spread area is. 3) It is considered that melting filler metal wets powder, and its heat of immersion furnishes the driving force for wetting. 4) Spreading mechanism and improving rate of brazability were related to the kind of powder metals. It is because their mutual solubility to filler metals or base metal are different from another. 5) Fe and W powders have little mutual solubility, and the wetting mechanisms of them are simple. 6) Cu and Ni powders quickly melt in melting filler metal, change its composition, and rise its melting point. Their improving rate of brazability is small. 7) Ni has large mutual solubility to Fe. Interfacial layer can be observed. The layer is considered to be formed by "dissolution and deposition mechanism". 8) Co powder behaves as Ni powder, but Co dissolves little in BAg filler metals. The spread area is four times as large as that of Ni.
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1979-04-05