Material transfer behavior of AgTiB2 and AgSnO2 electrical contact materials under different currents.pdfVIP

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Material transfer behavior of AgTiB2 and AgSnO2 electrical contact materials under different currents.pdf

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Material transfer behavior of AgTiB2 and AgSnO2 electrical contact materials under different currents.pdf

Materials and Design 114 (2017) 139–148 Contents lists available at ScienceDirect Materials and Design journal homepage: /locate/matdes Material transfer behavior of AgTiB2 and AgSnO2 electrical contact materials under different currents Hangyu Li a, Xianhui Wang a,?, Xiuhua Guo b, Xiaohong Yang a, Shuhua Liang a 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 HIGHLIGHTS ? The effect of characteristics of strengthening phase on material transfer of Ag base contact materials is disclosed. ? The material transfer mode of AgTiB2 contact material depends on current and TiB2 particle size. ? AgSnO2 contact material always presents the material transfer mode from cathode to anode. ? AgTiB2 contact material has larger mass loss and lower relative transfer mass in comparison with AgSnO2 contact material. ? Fine strengthening particles are bene?cial for less mass loss and relative transfer mass. GRAPHICAL ABSTRACT article info Article history: Received 19 July 2016 Received in revised form 19 October 2016 Accepted 24 October 2016 Available online 28 October 2016 Keywords: Ag base contact materials Strengthening phase Arc duration Arc energy Material transfer abstract To clarify the effect of the characteristics of strengthening phase on the material transfer behavior of silver base contact materials, the good electrical and thermal-conductive TiB2 ceramic and insulating and poor thermal-conductive SnO2 ceramic were selected as the strengthening phases, and the Ag-4wt.%TiB2 and Ag-4wt.%SnO2 contact materials were prepared with different sized TiB2 and SnO2 powders by powder metallurgy. The electrical contact tests were performed on an electrical contact material testing system at a voltage of 12 V DC and a current ranging from 5 A to 24 A. The results show that the material transfer mode is from cathode to anode