Investigation of the heat affected volume of CuCr contact material for vacuum interrupters

Hauf, U.; Feilbach, A.; Böning, M.; Heilmaier, Martin; Hinrichsen, Volker; Müller, F. Max

doi:10.1109/deiv.2016.7748695

Cited by 5 publications

(1 citation statement)

References 17 publications

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“…[10], where the microstructure and the heat affected volume (HAV) of disk shaped type as well as commercially used contacts was examined. The HAV of Cu with 25 wt % Cr and 43 wt % Cr was also investigated in a previous work [11]. For both compositions, HAV increases almost linearly and at similar slopes with rising transferred charge Q.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Formation and Resistivity Change in CuCr during Rapid Solidification

Hauf

Kauffmann

Kauffmann-Weiss

et al. 2017

Metals

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Abstract:The formation of the surface-near microstructure after a current interruption of CuCr contact materials in a vacuum interrupter is characterized by a fast heating and subsequently rapid solidification process. In the present article, we reveal and analyse the formation of two distinct microstructural regions that result from the heat, which is generated and dissipated during interruption. In the topmost region, local and global texture, as well as the resulting microstructure, indicate that both Cu and Cr were melted during rapid heating and solidification whereas in the region underneath, only Cu was melted and elongated Cu-grains solidified with the <001>-direction perpendicularly aligned to the surface. By analysing the lattice parameter of the Cu solid solution, a supersaturation of the solid solution with about 2.25 at % Cr was found independent if Cu was melted solely or together with the Cr. The according reduction of electrical conductivity in the topmost region subsequent to current interruption and the resulting heat distribution are discussed based on these experimental results.

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Section: Introductionmentioning

confidence: 99%