Development of nickel boron alloys for brazing materials

Nickel-base filler materials are generally used in applications where resistance to corrosion and heat resistance required. Their description as high-temperature brazing filler materials is amply justitied. In this study, nickel boron (NiB) alloys is produced via carbothermic reduction starting from boric acid (H₃BO₃) together with high purity nickel (NiO), charcoal and sawdust by using DC arc furnace which the boron-containing composition of the basic metal is tapped at the bottom. In the arc furnace experiments, different starting mixtures were carried out, and optimum starting composition for producing 15-20 wt. % B containing NiB alloys were investigated. Alloy compositions, metal recoveries, graphite electrode and energy consumptions were performed. The obtained products were characterized by using wet chemical analysis (AAS/ICP), XRD and SEM/EDS techniques.