니켈 전주층의 인장 물성(I)

Abstract

Tensile properties and hardness of nickel electroform from chloride-free nickel sulfamate electrolyte at 50℃ and PH 4.5 were investigated. Current density varied from 20 to 60㎃/㎠. The deposit thicknesses were 360, 480 and 980㎛. It was found in 480㎛ thick electroform that highest tensile and yield strengths and hardness of 83.7ksi, 53.6ksi and 216DPH, respectively were obtained at a current density of 40㎃/㎠ and they were slightly decreased at 20 and 60㎃/㎠. However the ductility was lowest of 7.9% at 40㎃/㎠. Such a high strength and low ductility at 40㎃/㎠ seems to be related to the narrower columnar structure than those of other current densities. All the deposits exhibited pronounced necking behavior. Tensile strength, yield strength and ductility increased as the nickel electroform thickens. Initial strong (200) texture developed on stainless steel mandrel decreased and (111) and (220) textures increased as deposit thickness increased, whereas (200) texture was preferred as the current density increased.