Proceedings of the Korean Institute of Surface Engineering Conference (한국표면공학회:학술대회논문집)

The Korean Institute of Surface Engineering (한국표면공학회)
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Electrodeposited Ni-W-Si3N4 alloy composite coatings: Evaluation of Scratch test

  • Gyawali, Gobinda (Research Center for Eco Multi-Functional Nano Materials, Sun Moon University) ;
  • Joshi, Bhupendra (Research Center for Eco Multi-Functional Nano Materials, Sun Moon University) ;
  • Tripathi, Khagendra (Research Center for Eco Multi-Functional Nano Materials, Sun Moon University) ;
  • Lee, Soo Wohn (Research Center for Eco Multi-Functional Nano Materials, Sun Moon University)
  • Published : 2014.11.20
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Abstract

In this study, $Ni-W-Si_3N_4$ alloy composite coatings were prepared by pulse electrodeposition method using nickel sulfate bath with different contents of tungsten source, $Na_2WO_4.2H_2O$, and dispersed $Si_3N_4$ nano particles. The structure and microstructure ofcoatings was separately analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM). Results indicated that nano $Si_3N_4$ and W content in alloy had remarkable effect on microstructure, microhardness and scratch resistant properties. Tungsten content in Ni-W and $Ni-W-Si_3N_4$ alloy ranged from 7 to 14 at.%. Scratch test results suggest that as compared to Ni-W only, $Ni-W-Si_3N_4$ prepared from Ni/W molar ratio of 1:1.5 dispersed with 20 g/L $Si_3N_4$ has shown the best result among different samples.

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