Development of Concact Materials for Vacuum Interrupters

Barkan, P.; Lafferty, J. M.; Lee, T. H.; Talento, J. L.

doi:10.1109/tpas.1971.293011

Cited by 34 publications

(2 citation statements)

References 9 publications

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“…Further evidence for the higher breakdown strength of hardened copper surfaces comes from measurements on copper-bismuth alloy electrodes. This alloy contains up to about 0.5 % bismuth and has been used successfully in vacuum switches, where, because of its brittleness, easy breaking of contact welds has been achieved (Barkan et al 1971). Measurements in this laboratory on a commercial vacuum switch containing electrodes made with this alloy gave values of EB ranging from 10 to 13 GV m-I.…”

Section: Spark Hardeningmentioning

confidence: 99%

Variation of the critical breakdown field between copper electrodes in vacuo

Cox

1974

J. Phys. D: Appl. Phys.

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The critical breakdown field, ie the product of field enhancement and (mean) applied electric field at breakdown, between copper electrodes in vacuum is shown to increase with the number of low-current (<1A) conditioning arcs. A similar effect is not observed on materials with smaller ranges of hardness (stainless steel, molybdenum, etc). A hypothesis is put forward that a local hardening of emitting regions occurs in copper due to the mechanical stresses induced into the surface at arc points. Experimental evidence supporting this is presented along with complementary experimental results for deliberately hardened copper surfaces.

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Section: Spark Hardeningmentioning

confidence: 99%

Variation of the critical breakdown field between copper electrodes in vacuo

Cox

1974

J. Phys. D: Appl. Phys.

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“…The main materials for the manufacture of electrode-tools for EDM are graphite [6,9], which is currently used not only for rough, but also for sheer processing [10,11] of copper [6,12] and its alloys (brass, aluminum) [13]. Composite materials based on copper with the addition of chromium, molybdenum, boron nitride, tungsten carbide are also included in this group [6,14]. Electrode materials, based on copper, constitute the bulk of the used metallic materials.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Structure and Properties of Tool-electrode qCu-Ti3SiC2q for EDM

Oglezneva¹,

Ogleznev²

2017

Proceedings of the International Conference "Actual Issues of Mechanical Engineering" 2017 (AIME 2017)

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The aim of this paper is to study the structure formation in the composite powder material "copper-Ti 3 SiC 2 " and to study erosion-resistance of tool-electrode made from this material by EDM of metal alloys. The influence of Ti 3 SiC 2 content on the properties (porosity, hardness, strength, electrical resistance, erosion wear) of composite materials Cu-Ti 3 SiC 2 was studied. The features of the structure formation of composition of materials during sintering is deintercalation of silicon from Ti 3 SiC 2 , formation of a solid solution of carbon-based titanium silicide Ti 5 Si 3 (C), small amounts of titanium carbide, silicon, and silicide TiSi 2 . Increasing the concentration of Ti 3 SiC 2 in the composite material reduces conductive properties, increases hardness, strength and wear resistance of the electroerosion electrode composites for EDM. The new material was used as a tool-electrode for electrical discharge machining for the first time. It was determined that the relative erosion wear resistance of a tool-electrode of composite materials Cu-Ti 3 SiC 2 , containing 12.5 -37.5 vol. % Ti 3 SiC 2 , in electrical discharge machining was 5 times higher compared to that of pure copper.

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High current contact material design constraints for tokamak devices

Banker¹

1984

Journal of Nuclear Materials

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Development of Concact Materials for Vacuum Interrupters

Cited by 34 publications

References 9 publications

Variation of the critical breakdown field between copper electrodes in vacuo

Variation of the critical breakdown field between copper electrodes in vacuo

Investigation of Structure and Properties of Tool-electrode qCu-Ti3SiC2q for EDM

High current contact material design constraints for tokamak devices

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