Third-body formation by selective transfer in a NiCr / AgPd electrical contact. Consequences on wear and remediation by a barrel tumble finishing

Abstract : The work addresses a particular case of interaction between adhesive and abrasive wear in the electrical contact field, characterized by a selective adhesive transfer layer. The system studied is composed of a resistive element (NiCr thin layer) and a contactor (AgPd), forming an angular position sensor lubricated with a standard silicone oil / PTFE grease. The angular position / electrical resistance relationship is disturbed by wear of the NiCr surfaces, enhanced by the formation on the AgPd contactor of a third body enriched in Ni. From a practical point of view, it has been found that this detrimental Ni-selective transfer formation can be controlled by inserting tumble finishing with lamellar alumina powder as the last step of NiCr track manufacturing. Acting like a solid lubricant, alumina clusters of 1 to 5 μm in size adhere to NiCr surface giving rise to a delay or cancel of Ni adhesion on the contactor which lead to a significant improvement of electrical behavior of the position sensor.
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https://hal-mines-paristech.archives-ouvertes.fr/hal-01963604
Contributeur : Pierre Montmitonnet <>
Soumis le : vendredi 21 décembre 2018 - 14:10:30
Dernière modification le : jeudi 7 février 2019 - 15:22:49

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  • HAL Id : hal-01963604, version 1

Citation

Manon Isard, Imène Lahouij, Pierre Montmitonnet, Jean-Michel Lanot. Third-body formation by selective transfer in a NiCr / AgPd electrical contact. Consequences on wear and remediation by a barrel tumble finishing. Wear, Elsevier, In press. ⟨hal-01963604⟩

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