439 溶融したPd系ろう材のマランゴニ対流による母材侵蝕(OS 溶接・接合(2))

抄録

The erosion of Ni baaed alloy substrate to the convection of the molten 54mas8%Ag-21ma88%Cu-25masB%Pd (BPd-6) brazing filler metal is numerically analyzed. During the brazing process using BPd-6 with organic binder, the binder is heated by radiation to form the slag floating on the molten brazing filler metal surface. The slag becomes the heat spot which might induce the Marangoni convection of the molten brazing filler metal. The numerical analysis of flow and temperature fields of the molten brazing filler metal reveals that the Marangoni convection occur on the case of the slag temperature of 1,050℃ and 1,010℃ on the 1,000℃ molten BPd-6. The flow is the well-up type around the slag. The substrate is considered to be eroded by the combination of the metallurgical dissolution and the Marangoni convection. The eroded pif s depth is quantitatively estimated from the total flux of the molten BPd-6 flown over the substrate surface is quantitatively.