Preparation and characterization of Ag-ZnO powders for applications in electrical contact materials

Joshi, P. B.; Murti, N. S. S.; Gadgeel, V. L.; Kaushik, Vijay Kumar; Ramakrishnan, P.

doi:10.1007/bf00423372

Cited by 20 publications

(4 citation statements)

References 4 publications

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“…During the second part of the last century, however, many of these properties have found applications in several fields of technology and, as a result, metallic particles ranging in size from a few nanometers to tens of micrometers are today used extensively in electronics, [3][4][5][6] catalysis, [7][8][9][10] pigments, 11 and metallurgy. 12 Several others applications such as biosensing, [13][14][15][16] antimicrobial, non-linear optics, 17 high density magnetic storage, 18 transparent conductive coatings, 19 etc., are still in early stages of development, but are expected to evolve rapidly over the next few years. More so than the traditional applications, these new technological fields require materials with well-controlled size, size distribution, morphology, composition, internal structure, and surface characteristics.…”

Section: Introductionmentioning

confidence: 99%

Preparation and formation mechanisms of uniform metallic particles in homogeneous solutions

2004

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Section: Introductionmentioning

confidence: 99%

Preparation and formation mechanisms of uniform metallic particles in homogeneous solutions

2004

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“…the use of electrical switching appliances and machinery is widely increasing in modern days. Contactors play a critical role of closing the circuit, holding the current at the contact points without any electro-thermo-mechanical interference, interrupting the circuit at times of need, and extending the loop for full number of operations without degradation using contact points with ideal property [1,2] shown in table 1.…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Kumar

Senthil

Parameshwaran

et al. 2021

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Fabrication oF a novel Silver-baSed electrical contact compoSiteS and aSSeSSment oF itS mechanical and electrical propertieS the electrical contactors play a crucial role in closing the circuit in many power distribution components like overhead lines, underground cables, circuit breakers, transformers, and control systems. the failure in these components mainly occurs due to the break-down of contactors due to the continuous opening and closing action of contacts. Silver (ag)-based oxide contact materials are widely used in practice, among which silver tin oxide (agSnO 2 ) is most common. an attempt is made in increasing the performance of agSnO 2 , by adding tungsten Oxide (wO 3 ) in various weight proportions, thus finding the optimal proportion of agSnO 2 wO 3 to have increased mechanical and electrical performances. all the composite samples are fabricated in-house using powder metallurgy process. the assessment of physical and electrical properties namely, density, hardness, porosity, and electrical conductivity, showed that 90%ag-8.5%SnO 2 -1.5%wO 3 composite yielded superior results. with help of morphological tests, wear characteristics are also investigated, which showed that 90%ag-8.5%SnO 2 -1.5%wO 3 composite has a wear coefficient of 0.000227 and a coefficient of friction of 0.174 at an optimized load of 10 n and sliding velocity of 0.5 mm/s.

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“…Development of novel materials with excellent mechanical and electrical as well as corrosion resistance properties are of great importance for high efficiency and reliability of future electrical contacts . Traditionally, materials used for electrical contact surfaces are mostly transition metals, e.g., gold (Au), silver (Ag) and copper (Cu) as well as their alloys and composites. − Usually, compromises between low contact resistance, good mechanical/tribological properties, stability and cost are necessary. For instance, these base metals possess high electrical conductivity but low wear resistance, and they may also tarnish or corrode easily during exposure to moisture and airborne contaminants .…”

Section: Introductionmentioning

confidence: 99%

Direct Electrochemical Synthesis of Reduced Graphene Oxide (rGO)/Copper Composite Films and Their Electrical/Electroactive Properties

Xie

Forslund

Pan

2014

ACS Appl. Mater. Interfaces

137

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Electrical contact materials with excellent performances are crucial for the development and safe use of electrical contacts in different applications. In our work, reduced graphene oxide (rGO)/copper (Cu) composite films, as potential electrical contact materials, have been synthesized on copper foil with one-step electrochemical reduction deposition method. Cyclic voltammetry (CV) was used to define the deposition conditions, and confocal Raman microscopy (CRM), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) were used to characterize the chemical compositions, molecular and micro- and nano-structures of the composite films. Atomic force microscopy/scanning Kelvin probe force microscopy (AFM/SKPFM), conductive AFM (C-AFM) as well as impedance analysis were employed to evaluate the electroactive/electrical properties of the prepared composite films, respectively. The CRM and XPS results suggest that the rGO/Cu composite films can be synthesized through one-step electrochemical codeposition using suitable precursor solutions. Within a short deposition period, the growth of discrete nanograins in the composite film predominates, whereas pine-tree-leaf nanostructures are formed in the composite film when the deposition period is long, due to the chelating role of GO or rGO to regulate the growth rate of metallic copper nanograins. The electrical resistivity of the composite films is lower than the polished Cu foil and the electrodeposited Cu film, probably due to the higher conductivity (enhanced transfer of charge carriers) of the rGO incorporated in the composite films. The Volta potential variation in the rGO/Cu composite film is quite different from that in the electrodeposited Cu film. The electroactivity of the rGO/Cu composite films is higher than the electrodeposited Cu film, but lower than polished Cu foil, and the underlying mechanisms have been discussed.

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Preparation and characterization of Ag-ZnO powders for applications in electrical contact materials

Cited by 20 publications

References 4 publications

Preparation and formation mechanisms of uniform metallic particles in homogeneous solutions

Preparation and formation mechanisms of uniform metallic particles in homogeneous solutions

Archives of Metallurgy and Materials

Direct Electrochemical Synthesis of Reduced Graphene Oxide (rGO)/Copper Composite Films and Their Electrical/Electroactive Properties

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