ダイヤモンドの活性金属ろう付界面組織とその形成過程
ダイヤモンド金属の接合に関する研究(第2報)
1995 年 13 巻 1 号 p. 39-45
詳細
1995 年 13 巻 1 号 p. 39-45
In the brazed joint of natural diamond to Fe-42 Ni alloy made with Ag-Cu eutectic filler including 4.5 wt% Ti, the behavior of titanium segregation changes according to the brazing thermal cycles, which causes the change in joint strength and the fracture mode. The chemical reaction products of diamond and the filler were identified by ESCA and EDS analyses on the fractured surfaces at the brazed interface, where the analyzed surfaces were made using a developed tensile shear test method, in order to propose the model of formation mechanism of the joint structure.
The analytical results revealed that such a structure as consists of TiC nucleation surrounded by Ag and/or Cu is preferred as the joint structure. It was also indicated that the segregation of Ti at the joint interface reduces the bonding strength, where the fracture is liable to occur at the interfaces of diamond-Ti and/or TiC-Ti.
The relation between the joint structure and the strength was also discussed using the disregistry values calculated in the previous report. The structure formation models of the interface between diamond and brazing filler metals were proposed to explain the change in the structure and strength of the joint made by different cooling rates.
