Electrical Contacts

Braunović, M.; Konchits, V. V.; Мышкин, Н. К.

doi:10.1201/9780849391088

Cited by 186 publications

(113 citation statements)

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“…For example, the deterioration of contact surfaces occurs with the increase in the number of switching operations resulting from the current; consequently, the shortening of useful life is inevitable. Failures of electrical contacts have resulted in severe consequences, e.g., energy collapse in a megalopolis, failure in telephone systems, and even airplane crashes [1]. Therefore, examination of the make/break operations of electrical contacts, and control of the arc formation play a significant role in selecting a new material or improving existing materials for electrical contacts.…”

Section: Introductionmentioning

confidence: 99%

“…A contact material must have reliable characteristics such as high electrical and thermal conductivity, high resistance to arc-erosion and welding, low vapor pressure and high resistance to the deteriorating effects of oxide, sulfide, and other compounds that cause insulation on contact surfaces [1]. Otherwise, arc-originated material evaporation leads to high amount of contact erosion [2].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Effect of Different Current Loads on the Arc-Erosion Performance of Electrical Contacts

Biyik

Aydın

2016

Acta Phys. Pol. A

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In this study, arc-erosion experiments using contactors were performed under inductive loads for up to 40000 switching operations to investigate the effect of different current loads on the arc-erosion performance of electrical contacts. Determination of the mass loss was performed after every 5000 operations. The arc-eroded surfaces were examined using scanning electron microscopy. The chemical composition near the arc was determined by energy dispersive X-ray spectroscopy. The results show that the contact surfaces are greatly affected by arc-erosion, resulting in mass loss due to material migration and/or evaporation. In addition, the arc-affected zones become bigger with the increase in the number of switching operations, especially at 20 A. However, electrical cleaning improves the contact performance by reducing the contact resistance due to breakdown of the non-conducting oxide films formed between 20000 and 25000 switching operations at 20 A. The stationary contacts experience major erosion, whereas the movable contacts suffered less contact erosion under each current load.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of the Effect of Different Current Loads on the Arc-Erosion Performance of Electrical Contacts

Biyik

Aydın

2016

Acta Phys. Pol. A

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“…The most effective strengthening of Al, Cu, Ag-based materials was reported for mechanically alloyed (MA) composites reinforced with fine metal-oxide particles [12][13][14][15][16][17][18][19][20]. However, both costly and time-consuming processing of the materials and low efficiency of used procedures put the meaningful limitation for the application of MA composites in practice.…”

Section: Introductionmentioning

confidence: 99%

Silver Matrix Composite Reinforced by Aluminium-Silver Intermetallic Phases

Włoch

Skrzekut

Sobota

et al. 2017

Archives of Metallurgy and Materials

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Silver and aluminum powders (82 mass % Ag and 18 mass % Al) were mixed and hot extruded at 673 K with extrusion ratio λ = 25. Performed X-ray diffraction analysis of as extruded rod revealed the development of Ag 3 Al and Ag 2 Al-type intermetallic phases. Structural observations and both chemical and diffraction analysis of structural components confirmed the growth of mentioned phases in the vicinity of elementary Al and Ag granules. No pores or voids were observed in the material. Mechanical properties of the composite, UTS = 490MPa, YS = 440 MPa, HV2 = 136, were relatively high if compared to commercial Ag and Cu products. Hot compression tests pointed to the good hot workability of the composite at deformation temperature range 473 K -773 K.The differential scanning calorimetry tests were performed in order to estimate structural processes during heating of Ag/ Al composite that lead to thermodynamically stable liquid state. It was found that characteristic temperature of three endothermic peaks correspond to (1) peritectoid transformation μ-Ag 3 Al → ζ-Ag 2 Al + (Ag), (2) the eutectic melting ζ-Ag 2 Al + (Al) → L, (3) melting of the ζ-Ag 2 Al phase.The Vickers hardness of the samples annealed at 673 K, for the time range up to 6900 minutes, was also determined. It was concluded that mutual diffusion of elements between Ag and Al granules and the growth of μ-Ag 3 Al and ζ-Ag 2 Al grains during annealing at 673 K result in a slight hardening of the composite.

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“…They are expected to offer a high resistance to wear caused by [10]. Silver-nickel electrical contacts are also resistant to oxidation and corrosion, and behave well at elevated temperatures [11,12]. Due to high oxidation resistance, they are used in the overhead circuit breakers, in industrial power relays, and in various switches, stress controls, cameras and instruments, which should have high resistance to wear.…”

Section: Introductionmentioning

confidence: 99%

Tribological Wear Behaviour of Electrical Contacts Made from AgNi10 Composite

Richert

Boczkal

Hotloś

et al. 2017

Archives of Metallurgy and Materials

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The effect of tribological wear of contacts made from an AgNi10 alloy on microstructure and electrical properties was investigated. The contacts were tested in duty cycles loaded with alternating current of 10A intensity. With this value of the current, intensive arcing of contacts occurred. The contacts were tested in the range of 125 to 500 thousand cycles. The contacting surfaces were reported to suffer a high degree of wear, but electrical resistance of the contact system remained stable.

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Electrical Contacts

Cited by 186 publications

References 0 publications

Investigation of the Effect of Different Current Loads on the Arc-Erosion Performance of Electrical Contacts

Investigation of the Effect of Different Current Loads on the Arc-Erosion Performance of Electrical Contacts

Silver Matrix Composite Reinforced by Aluminium-Silver Intermetallic Phases

Tribological Wear Behaviour of Electrical Contacts Made from AgNi10 Composite

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