전착법에 의한 Ni-SiC 복합도금의 형성 및 기계적 특성

Abstract

The formatiom and mechanical properties of Ni-SiC composite films on current density, pH, stirring time, rotation speed were investigated. The SiC content in Ni-SiC composite films increased with increasing rotation speed and deposition time up to 200 rpm and 20 min. The vickers hardness of Ni-SiC composite films were investigated higher than that of pure electrodeposited Ni. The hardness of Ni-SiC composite films was measured high in 2.5A/dm² within low current density area(current density ≤ 5A/dm²) and in 15A/dm² within high current density area(current density ≥ 5A/dm²). The hardness of Ni-SiC composite films was obtained as maximum value of 1350±80VHN at pH 3.5 and 15A/dm². The strain of Ni-SiC composite films was less than that of Ni film in general, decreased gradually with increasing current density.