Development of Contact Material Solutions for Low-Voltage Circuit Breaker Applications (2)

Mützel, Timo; Braumann, P.; Niederreuther, Ralf

doi:10.1109/holm.2011.6034790

Cited by 10 publications

(3 citation statements)

References 8 publications

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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%

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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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Section: ð1:4þmentioning

confidence: 99%

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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“…Both phase composition and structure of composites has a major impact on the properties of materials and their applicability [1][2][3][4][5][6][7]. Contact materials carrying high electric current in variable bonding conditions can serve here as an example.…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Frydman,

Borkowski,

Pietrzak

et al. 2018

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This paper presents technological trials aimed at producing Ag-W, Ag-WC, Ag-W-C and Ag-WC-C composite contact materials and characterizing their properties. These materials were obtained using two methods, i.e. press-sinter-repress (PSR) at the refractory phase content of less than 30% by weight as well as press-sinter-infiltration (PSI) at the refractory phase content of ≥50% by weight). The results of research into both the physical and electrical properties of the outcome composites were shown. They include the analysis of the influence of the refractory phase content (W or WC) on arc erosion and contact resistance changes for the following current range: 6 kA max in the case of composites with a low refractory phase content, 10 kA max in the case of composites with the refractory phase content of ≥50% by weight.

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Tungsten Carbides

Shabalin

2022

Ultra-High Temperature Materials IV

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Development of Contact Material Solutions for Low-Voltage Circuit Breaker Applications (2)

Cited by 10 publications

References 8 publications

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

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

Archives of Metallurgy and Materials

Tungsten Carbides

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