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| Research on microstructure and arc erosion resistance of W-25Cu composite materials for photovoltaic power switch |
| ZHANG Jing-jie1，LIU Xing-ya2 |
1. School of Mechanical and Electrical Engineering，He’nan Radio and Television University，Zhengzhou 450000，China
2. School of Mechanical Engineering，Zhengzhou Information Science and Technology Vocational College，Zhengzhou 450000，China |
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Abstract The W-25Cu composite material with fine grain was obtained by the hydrothermal co-reduction method. The microstructure and the morphology variation after arc erosion were also analyzed. Results show that the microstructure of W-25Cu composite material has an obvious densification characteristic. The fine W phase particles are surrounded by Cu phase totally. The distribution of Cu and W phases is very uniform，and the grain size of W phase is 1-3 μm. The fracture zone shows an obvious dimple toughening characteristics. In the fracture stage，many curved fine tear edges and many dense small fracture dimples are formed. After the arc erosion，the surface phase is mainly composed of Cu and W phase，and the surface is smooth without obvious holes and cracks. During the fracture closure stage，the material transfer process is mainly characterized by arc transfer，melting bridge transfer and splash evaporation.
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Received: 11 April 2017
Published: 10 August 2017
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2017, Vol. 27 
