• Title/Summary/Keyword: Electroless Ni

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A Study on the Mechanism for the Formation of Partices in electroless Ni Composite Coating(I) (무전해 Ni 복합도금 과정에서 분발의 공석 기구에 대한 연구(I))

  • 이원해;이승평
    • Journal of the Korean institute of surface engineering
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    • v.22 no.2
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    • pp.69-77
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    • 1989

  • Codeposion of inert particles particles in a metallic mateix by electroless plating process involves two phenomena. Firstly, the adsorption of inercles and secondly, the adsorption of inert particles on the cathode. In the present paper the first adsorption phenomenon and in the next paper the second ane are studied in greaterdetail for the Ni-SiCc, Ni-Al2AO3 and Ni-WC systems. Measurements of the Zeta potentials for the SiC and Al2AO3 particles have been in different electrolyte solutions and the ionic species adsorbed on the Particles studied. The addition of sodium acetate, trisodium citrate and sodium phosphinate to nikel sulface sruomotes the zeta potential of SiC and Al2O3 particles, but zeta phosphinate to nickel is more positive than Al2O3 particles although the amount of nickel ion adsorbrd on the Al2O3 particles become greater than that of SiC particles. It is suggested that this is due to adsortion of Na ion onto the surface SiC particles.

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Nickel Particle Coatings by Electroless Plating onto Carbon Nanotubes (탄소나노튜브 표면의 무전해 니켈입자 코팅)

  • Cho, Gue-Serb;Lim, Jung-Kyu;Jang, Hoon;Choe, Kyeong-Hwan
    • Korean Journal of Metals and Materials
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    • v.48 no.5
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    • pp.462-468
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    • 2010

  • Carbon Nanotubes (CNTs) have recently emerged as a material with outstanding properties. It has shown promising potential for applications in many engineering fields as electronic devices, thermal conductors, and light-weight composites. Researchers have investigated their use as reinforcements in themetal matrix composites of CNTs. In the present work, we decorated CNTs with Ni particles by electroless plating. The CNTs were wet-ball milled for various milling times with a nickel sulfate solution. The precipitated Ni particles were observed mainly by FESEM. In this study, the dispersion of the CNTs and Ni particles was improved with the addition of the surfactant. Also, as the CNTs were shortened and widened by an increased ball milling time, the size of the precipitated Ni particles increased. It was estimated that the CNTs were deformed and caused some defects on their surface during the ball milling process. Those defects were assumed to be heterogeneous nucleation sites for the Ni particles.

  • https://doi.org/10.3365/KJMM.2010.48.05.462 인용 KSCI