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Reaction kinetics of Cu–Ni and B4C in Cu–Ni alloy under solid-state sintering

ABSTRACT Cu–Ni/B4C diffusion couples were prepared by pressure-assisted sintering at different temperatures for different lengths of time under vacuum condition, and then phase composition and reaction kinetics of the products in the Cu–Ni alloy were investigated systematically. Results show that there is a reaction that occur between the Cu–Ni alloy and B4C, whose reaction products are Ni2B particles inside the Cu–Ni alloy along with a mixture of Ni2B and amorphous C at the interface between them. The diffusion of B into Cu–Ni alloys, important to the preparation of (Ni2B + C)/Cu composites, is interface-controlled and the thickness of the reaction layer containing Ni2B particles inside the Cu–Ni alloys can be expressed as .