Arc Erosion Behavior of Electrical Contact Materials
Summary
Arc erosion in electrical contact materials arises when an electrical arc is established across a gap during making or breaking operations. The intense localised heating and plasma generation at the contact interface lead to melting, vapourisation and material transfer between electrodes. The morphology and chemistry of the contact surface evolve continuously, driven by repeated thermal and mechanical stresses. Key factors influencing arc erosion include the intrinsic properties of the contact material—such as thermal conductivity, hardness, melting point and oxide formation tendency—as well as external conditions like current magnitude, voltage, switching speed and environmental atmosphere. Over successive switching cycles, cumulative mass loss, surface roughening and microcrack initiation can degrade contact performance, leading to increased resistance, welding or mechanical failure. Advances in material design focus on metal–oxide composites, alloying additions and microstructural engineering to balance arc stability, wear resistance and electrical conductivity. Improved understanding of plasma–material interactions and mass transfer mechanisms under arc conditions underpins the development of longer-life, environmentally benign contact materials with applications in low-voltage relays, high-power switches and emerging electric-vehicle power electronics.
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Arc Erosion Behavior of Electrical Contact Materials publication trend
The graph below shows the total number of articles in arc erosion behavior of electrical contact materials across all publications each year (not limited to Nature Index journals).
Technical terms
Arc erosion: The progressive degradation and mass loss of contact material due to repeated electrical arcing during switching operations.
Contact resistance: The electrical resistance at the interface between two contacting surfaces, influenced by surface roughness, oxide films and contact force.
Welding force: The mechanical force required to separate contact surfaces after they have been temporarily joined (welded) by an electrical arc.
Mass transfer: The movement of molten or vapourised material from one electrode to another under the influence of arc plasma dynamics.
Microstructure: The internal arrangement of phases, grains and inclusions within a material, which governs its mechanical and electrical behaviour under arc loading.
Arc root: The region on an electrode where the electrical arc attaches, characterised by high current density and intense heat flux.
References
- Fabrication and Arc Erosion Behavior of Ag-SnO2-ZnO Electrical Contact Materials. Materials (2023).
- Electrical Properties of In Situ Synthesized Ag-Graphene/Ni Composites. Materials (2022).
- Properties of AgSnO2 Contact Materials Doped with Different Concentrations of Cr. Materials (2022).
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