Performance evaluation of copper brazing using CU-NI-SN-P filler metal / Mohd Zubir Md Idris

Mohd Zubir, Md Idris (2017) Performance evaluation of copper brazing using CU-NI-SN-P filler metal / Mohd Zubir Md Idris. Masters thesis, University of Malaya.

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Abstract

Joining pure copper by brazing techniques using electric heated tube furnace has been done to brazed copper for heat exchanger application. Brazing temperatures specify within range of 660 °C to 700 °C using two different commercial alloy metals Cu-Sn-P base, VZ2200 and MBF2005. The filler metals were places between copper substrates layer. Heating processes was conducted in tube furnace at specific holding times of 5 to 15 minutes for each type of filler metal. Microstructure observation of the joints visibility was done using light optical microscope (OM) and field emission scanning electron microscopy (FESEM) and the element composition was analyzed by energy dispersive spectroscopy (EDS). Universal testing machine (UTM) was used for the inspection of mechanical property specifically for shear strength to measure the performance of the joints. Capture image under OM with the assist of computer software was conducted to measure the profile of intermetallic compound of the brazed layer. The brazed copper using filler metal of VZ2250 exhibited maximum shear strength 148 MPa when brazed at 680 °C with holding time of 15 minutes. While brazed pure copper using filler metal of MBF 2005 show its maximum shear strength 168 MPa when brazed at 680 °C with 10 minutes holding time. Keywords: Copper Filler metal Brazing temperature Holding time Microstructure

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