Electrochemical tailoring of ternary Ni-W-Co(Al2O3) nanocomposite using pulse reverse technique

Abstract Silver and silver(Ag)-graphene(Gr) nanocomposite coatings were prepared via direct current, pulse current and pulse reverse current on copper electrical contacts for evaluating electrical contact performance. The effects of the addition of Gr and current types on microstructure, crystallographic orientation, mechanical properties and electrical contact performance were investigataed via a scanning electron microscope, an X-Ray diffractometer, microhardness test device and an electrical contact test device, respectively. The addition of Gr changed the Ag surface morphology and decreased grain sizes. Moreover, the addition of Gr significantly improved arc erosion resistivity and decreased the average working temperature during the contact test. In addition, pulse current and pulse reverse current provided a significant improvement in microhardness and electrical contact erosion resistance owing to increased embedded graphene amounts in silver layers.

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Effect of Ce2(SO4)3 on structure and properties of Ni–Co/Al2O3 composite coating deposited by pulse reverse current method

Applied Surface Science ◽

10.1016/j.apsusc.2007.01.010 ◽

2007 ◽

Vol 253 (14) ◽

pp. 6085-6089 ◽

Cited By ~ 5

Author(s):

L.M. Chang ◽

H.F. Guo ◽

M.Z. An

Keyword(s):

Composite Coating ◽

Reverse Current ◽

Current Method ◽

Structure And Properties ◽

Al2o3 Composite ◽

Pulse Reverse

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Magnetic Nanoparticle Arrays with Ultra-Uniform Length Electrodeposited in Highly Ordered Alumina Nanopores(“Alumite”)

MRS Proceedings ◽

10.1557/proc-636-d9.33.1 ◽

2000 ◽

Vol 636 ◽

Cited By ~ 4

Author(s):

Robert M. Metzger ◽

Ming Sun ◽

Giovanni Zangari ◽

Mohammad Shamsuzzoha

Keyword(s):

Magnetic Nanoparticles ◽

Magnetic Nanoparticle ◽

Great Promise ◽

Nanometer Scale ◽

Nanoparticle Arrays ◽

Low Aspect Ratio ◽

Ordered Arrays ◽

High Uniformity ◽

Pulse Reverse ◽

Hexagonally Ordered

AbstractWe report nanometer-scale ordered arrays of cylindrical magnetic nanoparticles with low aspect ratio and ultra-high uniformity. Protracted anodization provides hexagonally ordered nanopores in amorphous Al2O3. For instance, pulsed electrochemical deposition grows Co particles of uniform length from the bottoms of these pores: these particles are polycrystalline and randomly oriented. The magnetism of the array is dominated by particle shape and by inter-particle magnetostatic interactions. A very clear transition of the anisotropy from perpendicular to in-plane is observed at a height to radius ratio of about 2. This pulse-reverse electrodeposition shows great promise for a reliable synthesis of uniform nanostructures of many metals.

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