等离子喷涂Ag/(Sn0.8La0.2)O2涂层的组织及电性能

付翀; 王俊勃; 杨敏鸽; 侯锦丽; 丁秉钧

doi:10.3724/SP.J.1037.2012.00599

金属学报 >

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

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

论文

等离子喷涂Ag/(Sn_0.8La_0.2)O₂涂层的组织及电性能

付翀 ,
王俊勃 ,
杨敏鸽 ,
侯锦丽 ,
丁秉钧

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1) 西安工程大学机电工程学院, 西安 710048
2) 西安交通大学金属材料强度国家重点实验室, 西安 710049

付翀, 男, 1980年生, 副教授, 博士

收稿日期: 2012-10-11

修回日期: 2012-11-30

网络出版日期: 2013-03-11

基金资助

国家自然科学基金重点项目50834003, 陕西省教育厅专项科研计划项目11JK0808和西安工程大学博士启动基金项目BS1108资助

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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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摘要

采用等离子喷涂技术在纯Cu表面制备了Ag/(Sn_0.8La_0.2)O₂涂层, 利用XRD和SEM对涂层的相结构和微观组织进行了分析,用拉伸法测定了涂层与基体的结合强度, 通过电弧侵蚀实验测试了涂层的耐电压强度以及耐电弧侵蚀性能. 结果表明, 所得涂层结构均匀致密, 与基体结合强度为18.8 MPa, 涂层内纳米级(Sn_0.8La_0.2)O₂颗粒均匀分布在Ag基体中; 涂层的耐电压强度以及电弧烧蚀速率与块体合金接近, 分别为3.76×10⁷ V/m和37.7 μg/C; 电弧侵蚀实验后, 涂层表面阴极斑点分散, 烧蚀轻微, 其电弧侵蚀机制有从液态喷溅向蒸发侵蚀转变的趋势.

关键词： 等离子喷涂; Ag/(Sn_0.8La_0.2)O₂; 触头合金; 耐电压强度; 电弧侵蚀

本文引用格式

付翀 , 王俊勃 , 杨敏鸽 , 侯锦丽 , 丁秉钧 . 等离子喷涂Ag/(Sn_0.8La_0.2)O₂涂层的组织及电性能[J]. 金属学报, 2013 , 49(3) : 325 -329 . DOI: 10.3724/SP.J.1037.2012.00599

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

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