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Effect of strengthening phase on material transfer behavior of Ag-based contact materials under different voltages.pdf
Vacuum 135 (2017) 55e65
Contents lists available at ScienceDirect
Vacuum
journal homepage: /locate/vacuum
Effect of strengthening phase on material transfer behavior of Ag-based contact materials under different voltages
Hangyu Li a, Xianhui Wang a, *, Yanfeng Liu a, Xiuhua Guo b
a School of Materials Science and Engineering, Xian University of Technology, Xian 710048, PR China b School of Materials Science and Engineering, Henan University of Science and Technology, Henan 471003, PR China
article info
Article history: Received 12 September 2016 Received in revised form 25 October 2016 Accepted 26 October 2016 Available online 27 October 2016
Keywords: Ag-based contact materials Arc erosion Material transfer Arc duration Arc energy
abstract
To clarify the correlation of strengthening phase and particle sizes with the material transfer behavior for Ag-based contact materials, the Ag-4wt%TiB2 and Ag-4wt%SnO2 contact materials reinforced with different TiB2 and SnO2 particles were prepared, and the electrical contact tests were up to 5000 operations at different voltages. The surface morphologies of arc-eroded specimens were characterized by scanning electron microscope, the mass changes before and after electrical contact test were determined, and the material transfer behavior of Ag-4wt%TiB2 and Ag-4wt%SnO2 contact materials at different voltages were discussed as well. The results indicate that the voltage has a signi?cant effect on make arc and break arc, which leads to the change of the material transfer mode. Furthermore, the strengthening phase remarkably in?uence the electrical performances of Ag-based contact materials. The Ag-4wt%TiB2 contact material presents higher make-arc-energy and lower break-arc-energy than the Ag-4wt%SnO2 contact material. The ?ne strengthening particles are bene?cial for the decrease of arc energy. Subsequently, the Ag-based contact material prepared with ?ne strengthening particles has less material transfer and mass loss.
? 2016 El
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