Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403


공학

한국표면공학회지 (43권6호 255-259)

Effects of the Electroplating Duration on the Mechanical Property of the Ni-Co-SiC Composite Coatings

Effects of the Electroplating Duration on the Mechanical Property of the Ni-Co-SiC Composite Coatings

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Kim, Sung-Min;Lee, Hong-Kee;

Heat Treatment and Plating Faculty Center, Korea Institute of Industrial Technology;
Heat Treatment and Plating Faculty Center, Korea Institute of Industrial Technology;

DOI : 10.5695/JKISE.2010.43.6.255

Abstract

In this work, Ni-Co composites incorporated with nano-sized SiC particles in the range of 45-55 nm are prepared by electroplating. The effects of plating duration on the chemical composition, surface morphology, crystalline structures and hardness have been studied. The maximum hardness of Ni-Co-SiC composite coating is approximately 633 Hv at plating duration of 1 h. The hardness is gradually decreased with increasing plating duration, which can be attributed to the growth of crystalline size and the agglomerates of SiC nano-particles. It is therefore explained that the grain refinement of Ni-Co matrix and stable dispersion of SiC particles play an important role for strengthening, which indicate Hall-Petch relation and Orowan model were dominant for hardening of Ni-Co-SiC composite coatings.

Keywords

Composite coating;Ni-Co-Sic;