Mechanical Properties of Ni-P/Diamond Composite Films Processed by Electroless Plating Method
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Mechanical Properties of Ni-P/Diamond Composite Films Processed by Electroless Plating Method Jin Ki Cho1,2, Mi Sun Yoo1, Moon Tea Kim1, Seung Roung Beak3, Sung Goon Kang2, and Chan Hyoung Kang1 1
Department of Advanced Materials Engineering, Korea Polytechnic University, 2121 Jeoung-Wang Dong, Siheung-Si, Kyonggi-Do, 429-450, Korea, Democratic People's Republic of
2
Division of Materials Science and Engineering, Hanyang University, Seoul, 133-791, Korea, Democratic People's Republic of
3
Young-In PlaChem, 634-6, Sunggok-Dong, Ansan-City, Kyonggi-Do, 425-833, Korea, Democratic People's Republic of
Recent advancements in various industries have necessitated the development of new engineering materials exhibiting superior properties of different character. For example, composite plating renders excellent corrosion- and wear-resistant materials with good lubrication behavior and chemical stability. Nanometer-sized diamond particles are expected to be good dispersion materials in electro-less composite plating. However, the processing conditions and characteristics of metal/diamond composites are not well understood so far. In this investigation, we carried out an experiment on the process and properties of NiP/Nano-Diamond(ND) composite coating with plating conditions. In order to prepare the ND suspension, we used ND powder by electric explosion method. The particle size of used ND powder was about 3~8nm size, but these were very easily agglomerated due to high surface energy of ND particles. The diamond particles of a few hundred nanometer size were dispersed by ultrasonication method. No additives were applied in this process as in the conventional methods for the efficient dispersion of diamond particles. The dispersibility of ND suspension was revealed zeta potential and cluster size. The ND particles agglomerate diameter(nm) were successfully dispersed by ultrasonic dispersion method, after the 400W, 24kHz, 30min. The excellent dispersibility of ND suspension was obtained when the ND concentration was loaded 1g/l and ultrasonic treatment time was 30min and pH of the plating solution
was 5. The composite films were co-deposited on steel plates using the commercial electrolyte composed of nickel sulfate and sodium hypophosphite. Process conditions were optimized in terms of the concentration of diamond particles, ultrasonic treatment time, and pH of the plating solution. The morphology of the prepared films was characterized by FESEM. The surface roughness, micro-hardness and friction coefficient were measured by SPM, Vickers hardness tester and tribometer, respectively. The present experimental results revealed remarkable differences in the values of the surface morphology and roughness, micro-hardness and friction coefficient, compared to those of conventional diamond-free electroless Ni-P films. The best film properties were obtained when the ND concentration was loaded 1g/l and ultrasonic treatment time was 30min and pH of the plating solution was 5. From these results, we were confirmed t
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