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http://dx.doi.org/10.21289/KSIC.2022.25.6.1037

Effect of Process Parameters on Microhardness of Ni-Al2O3 Composite Coatings  

Jin, Yeung-Jun (Dept. of Aeronautical & Mechanical Design Engineering, KNUT)
Park, Simon (Dept. of Mechanical & Manufacturing Engineering)
Publication Information
Journal of the Korean Society of Industry Convergence / v.25, no.6_2, 2022 , pp. 1037-1045 More about this Journal
Abstract
In this study, nanoscale Al2O3 ceramic particles were used due its exceptionally high hardness characteristics, chemical stability, and wear resistance properties. These nanoparticles will be used to investigate the optimal process conditions for the electro co-deposition of the Ni-Al2O3 composite coatings. A Watts bath electrolytic solution of a controlled composition along with a fixed agitation speed was used for this study. Whereas the current density, the pH value, temperature and concentration of the nano Al2O3 particles of the electrolyte were designated as the manipulative variables. The experimental design method was based on the orthogonal array to find the optimum processing parameters for the electro co-deposition of Ni-Al2O3 composite coatings. The result of confirmation experimental based on the optimal processing condition through the analysis of variance ; EDX analysis found that the ratio of alumina increased to 8.65 wt.% and subsequently the overall hardness increased to 983 Hv. Specially, alumina were evenly distributed on Nickel matrix and particles were embedded more firmly and finely in Nickel matrix.
Keywords
Electro Co-Deposition; Metal Composite Coating; Microhardness; Microstructure; Process Parameter;
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