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Acta Metall Sin  2013, Vol. 49 Issue (3): 325-329    DOI: 10.3724/SP.J.1037.2012.00599
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MICROSTRUCTURE AND ELECTRICAL PROPERTIES OF Ag/(Sn0.8La0.2)O2 COATING PREPARED BY PLASMA SPRAYING
FU Chong1, WANG Junbo1, YANG Minge1, HOU Jinli1, DING Bingjun2
1)Mechanical and Electronic Engineering College, Xi'an Polytechnic University, Xi'an 710048
2)National Laboratory for Materials Strength, Xi'an Jiaotong University, Xi'an 710049
Cite this article: 

FU Chong, WANG Junbo, YANG Minge, HOU Jinli, DING Bingjun. MICROSTRUCTURE AND ELECTRICAL PROPERTIES OF Ag/(Sn0.8La0.2)O2 COATING PREPARED BY PLASMA SPRAYING. Acta Metall Sin, 2013, 49(3): 325-329.

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Abstract  

As a pollution-free contact material, Ag/SnO2 has shown a promising prospect to replace noxious Ag/CdO because of its remarkable resistance to arc-erosion and welding. Especially La-doped Ag/SnO2 contact alloy shows excellent electrical properties during arcing test. In this paper, Ag/(Sn0.8La0.2)O2 coating on the Cu substrate was prepared by atmospheric plasma spraying. The phase structure and microstructure of Ag/(Sn0.8La0.2)O2 coating were characterized using XRD and SEM, respectively. The tests of tensile and arc erosion were employed to evaluate bonding strength and electrical properties of coating. The results show that the prepared coating has the uniform dense microstructure. The nanosized (Sn0.8La0.2)O2 particles are uniformly dispersed within the Ag matrix of coating. The bonding strength is 18.8 MPa. The breakdown strength and arc erosion rate of coating are 3.76×107 V/m and 37.7 μg/C, and the value are close to the bulk material. After arcing test, the surface of coating presents the dispersion of cathode spots and a little erosion, and the arc erosion mechanism of Ag/(Sn0.8La0.2)O2 coating has a change tendency from liquid splash to evaporation erosion.

Key words:  plasma spraying      Ag/(Sn0.8La0.2)O2      contact material      breakdown strength      arc erosion     
Received:  11 October 2012     

URL: 

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00599     OR     https://www.ams.org.cn/EN/Y2013/V49/I3/325

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