Material transfer behavior of AgTiB2 and AgSnO2 electrical contact materials under different currents
| Autor: | Xianhui Wang, Hangyu Li, Shu-hua Liang, Xiuhua Guo, Xiaohong Yang |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
02 engineering and technology 01 natural sciences law.invention law Powder metallurgy Phase (matter) 0103 physical sciences lcsh:TA401-492 Forensic engineering General Materials Science Ceramic Composite material 010302 applied physics Mechanical Engineering 021001 nanoscience & nanotechnology Electrical contacts Cathode Anode Mechanics of Materials visual_art visual_art.visual_art_medium lcsh:Materials of engineering and construction. Mechanics of materials Current (fluid) 0210 nano-technology Voltage |
| Zdroj: | Materials & Design, Vol 114, Iss, Pp 139-148 (2017) |
| ISSN: | 0264-1275 |
| DOI: | 10.1016/j.matdes.2016.10.056 |
| Popis: | 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 at small currents for the Ag-4wt.%TiB2 contact material. However, it changes reversely at large currents. For the Ag-4wt.%TiB2 contact materials prepared with 500 nm and 60 nm TiB2 powders, the critical current at which the material transfer mode changes are 16 A and 24 A, respectively. Nevertheless, the material transfer mode for the Ag-4wt.%SnO2 contact material is always from cathode to anode at 5-24 A. Furthermore, fine strengthening particles are beneficial for less mass loss and relative transfer mass for both Ag base contact materials. The Ag-4wt.%TiB2 contact material presents a lower relative transfer mass than Ag-4wt.%SnO2 contact material. Keywords: Ag base contact materials, Strengthening phase, Arc duration, Arc energy, Material transfer |
| Databáze: | OpenAIRE |
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