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Effects of Ni and Co elements in filler metals in Ag brazing of cemented carbide

Abstract This study focused on understanding the reason for improvements in wetting characteristics to cemented carbide due to the Ni element in filler metals, and the effects of Ni element on the strength of brazed joints. Furthermore, the effects of Co element in filler metals on the strength of brazed joints were investigated. The results obtained are as follows. By adding Ni element to the filler metal, α-Cu solid solution phases were formed along the interface; consequently, the distribution of Ag and Co elements across the interface continuously changed. It appeared that the continuous distribution of Ag and Co elements across the interface caused the wetting characteristics to improve. Addition of Ni element expanded the Co depleted zone in the cemented carbide around the interface and decreased the strength of brazed joints. The addition of the Co element narrowed the Co depleted zone, resulting in an increase of the strength of brazed joints.