Base metal alloys with self-healing native conductive oxides for electrical contact materials

[摘要]：Base metals for electrical contacts exhibit high bulk conductivities but form low-conductivity native oxide scales in air, leading to unacceptably high contact resistances. Here we show that alloying base metals can lead to higher conductivity native scales by: doping to enhance carrier concentration; inducing mixed oxidation states to give electron/polaron hopping; and/or phase separation for conducting pathways. Data from Cu-La, Fe-V, and Ni-Ru alloys demonstrate the viability of these approaches, yielding contact resistances up to 10(6) times lower than that for oxidized Cu. (c) 2010 American Institute of Physics. [doi:10.1063/1.3499369]

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