Silver tungsten carbide contacts fork circuit breaker applications

Mützel, Timo; Kempf, Bemd

doi:10.1109/holm.2014.7031059

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…This liquid phase is most likely also responsible for the improved densification and reaction rate. Furthermore, it should be mentioned that elements from groups 8, 9 and 10 (Group VIII in the old notation) in the periodic table (i.e., Fe, Co and Ni) are known to enhance the sinterability of transition metals and their carbides by reducing the activation energy for diffusion in the system (i.e., addition of Ni in Ag-WC) [29,30]. What remains puzzling is why additives like Fe, Co or Ni change the atomic stacking of the MAX phases without being present in the crystal structure.…”

Section: Discussionmentioning

confidence: 99%

Reactive spark plasma sintering of Ti3SnC2, Zr3SnC2 and Hf3SnC2 using Fe, Co or Ni additives

Lapauw

Tunca

Cabioc’h

et al. 2017

Journal of the European Ceramic Society

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Section: Discussionmentioning

confidence: 99%

Reactive spark plasma sintering of Ti3SnC2, Zr3SnC2 and Hf3SnC2 using Fe, Co or Ni additives

Lapauw

Tunca

Cabioc’h

et al. 2017

Journal of the European Ceramic Society

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“…The switching test conditions used in each case are very distinct, thus prudence is required to compare different results. The Ag content has only been varied in [1], and dopant amount has been varied in [2], whereas the effect of the WC particle size or the reinforcing phase has never been studied. Thus in this work, we study the influence of both the WC particle size and Ag content on the contact resistance of Ag-WC contact materials.…”

Section: ð1:4þmentioning

confidence: 99%

“…Silver based metal matrix refractory composites have been of considerable interest to the electrical industry for making electrical contacts, which are employed in circuit breakers [1][2][3] and vacuum contactors [3,4] as an arc-resistant material. The addition of refractory carbides and/or metals like WC and W to the silver matrix has resulted in enhancing the desired properties of these materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of WC particle size and Ag volume fraction on electrical contact resistance and thermal conductivity of Ag–WC contact materials

et al. 2015

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In this work, theoretically dense (N 99%) composites of Ag and WC have been prepared by press-sintering-infiltration for making electrical contacts used as an arc-resistant material in a model switching device. Composites with varying silver content and WC particle size were investigated to get an insight on their electrical contact resistance (R c ) and their ability to withstand enormous thermal stresses during switching. A break-only model switching sequence was used, where the evolution of R c was measured over 50 cycles and the post-switching microstructures were investigated for thermal stress induced crack formation. A well-established 2D computational microstructure based model, object-oriented finite element analysis version 2 (OOF2), was used to determine the composite thermal conductivity (k) for various grades as a function of temperature. R c was observed to be consistently low for the coarser WC containing composite and higher silver content composites. This response was attributed to the ductility of the surface layers formed during switching. Crack formation after switching was found to be a direct consequence of large thermal gradients during 50 cycles, which was minimal for coarser WC grained and higher silver content composites which have a higher thermal shock resistance.

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“…Silver-based composites have been widely used as electrical contact materials for several decades due to their outstanding electric properties [1,2]. Among them, AgC composites are most attractive because of their outstanding electrical conductivity, low contact resistance, good resistance to fusion welding, and excellent lubrication performance [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Post-Treatments on Arc Erosion Resistance of Cold-Sprayed AgC Composite Electric Contact

Zhou

Liu

et al. 2021

Coatings

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Graphite-silver (AgC) composite materials are widely used in outdoor high-voltage electrical switchgear due to their combining properties of excellent conductivity and outstanding arc-suppressing performance. However, the methods for fabricating AgC composite materials still have some limitations. In this study, the cold spray technique was adopted to deposit AgC composite coatings with the optimized parameters on the copper substrate. Then, AgC coatings were annealed in the furnace and treated by laser scanning, respectively, to further improve the arc erosion resistance performance of the coatings. The results show that the phase structure and electrical resistance of AgC coatings were not influenced by the post-treatment process. Furthermore, excellent hydrophobic performance was obtained after surface laser scanning treatment. The laser scanning treatment exhibited favorable advantages in enhancing the arc erosion resistance of AgC coatings, which indicated the lowest arc erosion rate compared with the cold-sprayed and annealed coatings.

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Silver tungsten carbide contacts fork circuit breaker applications

Cited by 5 publications

References 9 publications

Reactive spark plasma sintering of Ti3SnC2, Zr3SnC2 and Hf3SnC2 using Fe, Co or Ni additives

Reactive spark plasma sintering of Ti3SnC2, Zr3SnC2 and Hf3SnC2 using Fe, Co or Ni additives

Effect of WC particle size and Ag volume fraction on electrical contact resistance and thermal conductivity of Ag–WC contact materials

Effects of Different Post-Treatments on Arc Erosion Resistance of Cold-Sprayed AgC Composite Electric Contact

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