The effects of graphite additions on the performance of silver-nickel contacts

Wingert, P.C.; Bevington, R.; Horn, Guenther

doi:10.1109/33.76516

Cited by 12 publications

(2 citation statements)

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“…There has been much attention on doping to improve the performance of Ag/Ni. The authors of [ 8 , 9 , 10 ] studied the effects of different carbon allotropes (carbon nanotube, nano graphene sheet, and graphite) on the microstructure and properties of Ag/Ni contact through experiments. The results showed that all carbon allotropes can improve the welding resistance.…”

Section: Introductionmentioning

confidence: 99%

Study on Simulation and Experiment of Cu, C-Doped Ag/Ni Contact Materials

et al. 2022

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Ag/Ni contact material with greenery and good performance is a cadmium-free silver-based contact material that has been vigorously developed in recent years. However, Ag/Ni contact material has poor welding resistance. Based on the first principles of density functional theory, the interface model of Cu, C-doped Ag/Ni was established. The work of separation and interfacial energy of interface models showed that doping can improve the interfacial bonding strength and interfacial stability, with C-doped Ag/Ni having the strongest stability and interfacial bonding strength. It can be seen from the population and density of state that covalent bonds exist between Ag and Ni atoms of the Ag/Ni phase interface at the electronic structure level. Finally, the doped Ag/Ni contact material was prepared by the powder metallurgy method. Through the arc energy and welding force in the electrical contact experiment, it was obtained that the welding resistance of C-doped Ag/Ni was better than Cu-doped Ag/Ni contact material, which verified the correctness of the simulation results. Overall, the present study provides a theoretical method for the screening of doping elements to improve the performance of Ag/Ni contact material.

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Section: Introductionmentioning

confidence: 99%

Study on Simulation and Experiment of Cu, C-Doped Ag/Ni Contact Materials

et al. 2022

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“…Typical applications include ac switches, relays, and thermostatic controls for loads in the 5-25 A range; ac disconnect or dc drive switches up to 400 A; and commercial medium size circuit breaker [1], [2]. When making and breaking,an electric arc takes place and forms a narrow bridge-like current channel between two contact ends.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and arc erosion characteristics of Ag/Ni contacts by mechanical alloying

Luo¹,

Wang²,

Ding

2005

IEEE Trans. Comp. Packag. Technol.

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Ag70/Ni30 contact alloy is prepared by the process of mechanical alloying and subsequent hot pressing. Results detected by X-ray diffraction and transmission electronic microscope indicate that this alloy is a mixture of "huge" Ag-rich matrix and micro-scaled or nanocrystalline Ni-rich particles. The fine particles strengthen alloy mechanically and their uniform dispersion also improve arc erosion morphology to a large extend, compared with situation of traditional materials prepared through power metallurgy technique.Index Terms-AgNi, contact alloy, hot pressping (HP), mechanical alloying (MA), X-ray diffraction (XRD).

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