MICROSTRUCTURE AND ELECTRICAL PROPERTIES OF Ag/(Sn0.8La0.2)O2 COATING PREPARED BY PLASMA SPRAYING

FU Chong; WANG Junbo; YANG Minge; HOU Jinli; DING Bingjun

doi:10.3724/SP.J.1037.2012.00599

Acta Metall Sin >

2013 , Vol. 49 >Issue 3: 325 - 329

DOI: https://doi.org/10.3724/SP.J.1037.2012.00599

MICROSTRUCTURE AND ELECTRICAL PROPERTIES OF Ag/(Sn_0.8La_0.2)O₂ COATING PREPARED BY PLASMA SPRAYING

FU Chong ,
WANG Junbo ,
YANG Minge ,
HOU Jinli ,
DING Bingjun

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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

Received date: 2012-10-11

Revised date: 2012-11-30

Online published: 2013-03-11

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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/(Sn_0.8La_0.2)O₂ coating on the Cu substrate was prepared by atmospheric plasma spraying. The phase structure and microstructure of Ag/(Sn_0.8La_0.2)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 (Sn_0.8La_0.2)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/(Sn_0.8La_0.2)O₂ coating has a change tendency from liquid splash to evaporation erosion.

Key words： plasma spraying; Ag/(Sn_0.8La_0.2)O₂; contact material; breakdown strength; arc erosion

Cite this article

FU Chong , WANG Junbo , YANG Minge , HOU Jinli , DING Bingjun . MICROSTRUCTURE AND ELECTRICAL PROPERTIES OF Ag/(Sn_0.8La_0.2)O₂ COATING PREPARED BY PLASMA SPRAYING[J]. Acta Metall Sin, 2013 , 49(3) : 325 -329 . DOI: 10.3724/SP.J.1037.2012.00599

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