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Formation and effects of CuO nanoparticles on AgSnO2 electrical contact materials.pdf

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Formation and effects of CuO nanoparticles on AgSnO2 electrical contact materials.pdf

Journal of Alloys and Compounds 696 (2017) 1228e1234 Contents lists available at ScienceDirect Journal of Alloys and Compounds journal homepage: /locate/jalcom Formation and effects of CuO nanoparticles on Ag/SnO2 electrical contact materials Guijing Li a, *, Huijie Cui b, Jun Chen a, Xueqian Fang a, Wenjie Feng a, Jinxi Liu a a Department of Engineering Mechanics, Shijiazhuang Tiedao University, Shijiazhuang, Hebei, 050043, China b HeSteel Group, Technology Research Institute, Shijiazhuang, Hebei, 050023, China article info Article history: Received 6 October 2016 Received in revised form 28 November 2016 Accepted 6 December 2016 Available online 9 December 2016 Keywords: Ag/SnO2 Contact materials Powder metallurgy CuO Arc erosion abstract The Ag/SnO2 contact materials modi?ed by the in situ formed CuO nanoparticles were prepared through a self-assembly-precipitation method combined with powder metallurgy. The micro morphology and composition proportion of the Ag-CuO composite powders were investigated. The microstructures and physical properties of the prepared Ag-CuO/SnO2 materials were studied. After arc erosion, the surface morphology and element distributions of the Ag-CuO/SnO2 materials were characterized by Scanning Electron Microscopy (SEM) and Electron Probe Microanalysis (EPMA). The results showed that the CuO nanoparticles smaller than 10 nm were formed on the whole surface of Ag powder. The electrical conductivity of the Ag/SnO2 contact materials was signi?cantly increased with the introduction of CuO, and the hardness, however, was slightly decreased, which could improve the workability. The formation of ultra?ne CuO nanoparticles signi?cantly improved the arc dispersion and arc erosion resistance of Ag/ SnO2 materials. The aggregation of SnO2 particles in the erosion area was effectively suppressed. ? 2016 Elsevier B.V. All rights reserved. 1. Introduction The Ag based electrical contact materials have been widely applied in low voltage electric devic