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Vol.39, No.9, 1068 ~ 1076, 2001
Title
Research Papers / Welding & Joining : Effects of Alloying Elements on the Microstructure and Mechanical Properties of Cd - free Brazing Alloys
정재원Jae Won Chung,김광석Gwang Suk Kim,이상율Sang Yul Lee,양성철Sung Chul Yang
Abstract
Effects of Sn and Ni in the Cd-free Ag-Cu-Zn based brazing alloys on the microstructure, physical and mechanical properties of the brazed joints were investigated by differential scanning calorimetry(DSC), scanning electron microscope(SEM) equipped with energy-dispersive spectrometer(EDS), X-ray diffractometer(XRD) and shear strength test. As the Ni is added 1∼2wt% in the brazing alloys, the grain size of brazing alloys decreased and microhardness increased from Hv120 up to Hv140. Wetting depth measurement test showed that the wettability of Cd-free 30wt%Ag-35Cu-32Zn-2Sn-1Ni alloy was better than that of 35wt%Ag-24Cu-22Zn-19Cd alloy. However the increase in Ni addition from 1wt% to 2wt%, reduced the wettability. The maximum shear strength obtained from the brazed specimen with Cd-free 30wt%Ag-34Cu-32Zn-2Sn-2Ni alloy was measured to be approximately 270㎫.
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