Abstract ▼ AI-Helper

Plate/Fin heat exchager technology is well known, and units of this type have been used for several decades in many aerospace and industrial applications. Generally, The brazing process is used for joining of Plate/Fin heat exchanger with Ni based alloy. But there are no research about heat exchange...

Plate/Fin heat exchager technology is well known, and units of this type have been used for several decades in many aerospace and industrial applications. Generally, The brazing process is used for joining of Plate/Fin heat exchanger with Ni based alloy. But there are no research about heat exchanger joining with Inconel625 for plate and Ni201 for fin using MBF-30.
This study was carried out to investigate the effect of bonding temperature and holding time on microstructure and mechanical properties in brazing joints of Ni-base superalloy using MBF-30 (Ni-4.5Si-3.2B [wt.%]). The heating rate was 20℃/min to the bonding temperatures 1050℃, 1070℃, 1090℃ under high vacuum condition. The holding times were 100s, 400s, 900s and 1600s.
Ni3B phases and Ni were observed in the interlayer of Ni201. Then, Ni3B and Ni3Si were found in the middle region of brazing joint. Cr-boride phase appeared in the interlayer of Inconel625.
Tensile strength and elongation were decreased at 1050℃-1600s, 1070℃-900s and 1090℃-400s. After observation the fracture specimens, There was Ni3B which is very brittle phase in the grain boundary of Ni201.

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