不同粒度银粉的Ag-TiB_(2)触头材料电弧侵蚀行为  

Arc Erosion Behavior of Ag-TiB_(2) Contact Materials with Ag Powders of Different Sizes

作　　者：李航宇 王献辉[1] 高倩雯 梁燕[1,2] 费媛 Li Hangyu;Wang Xianhui;Gao Qianwen;Liang Yan;Fei Yuan(Shaanxi Key Laboratory of Electrical Materials and Infiltration Technology,Xian University of Technology,Xian 710048,China;Northwest Institute of Nonferrous Metals,Xian 710016,China)

机构地区：[1]西安理工大学陕西省电工材料与熔(浸)渗技术重点实验室,陕西西安710048 [2]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2022年第3期765-771,共7页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51971173);Doctoral Dissertation Innovation Fund of Xian University of Technology(310/252072011)。

摘　　要：采用不同粒度的银粉和放电等离子烧结工艺制备了Ag-4%TiB_(2)(质量分数,下同)触头材料,测量了Ag-4%TiB_(2)触头材料的致密度、导电率和硬度,并在真空下对Ag-4%TiB_(2)触头材料进行了电弧侵蚀实验。采用扫描电子显微镜对Ag-4%TiB_(2)触头材料电弧侵蚀后的表面形貌进行了表征,采用TDS-2014双通道数字存储示波器记录了燃弧波形,并计算了燃弧时间,对电弧侵蚀机理进行了探讨。结果表明,Ag-4%TiB_(2)触头材料的致密度、导电率和硬度均随着Ag粒度的降低而增加。另外,采用细银粉制备的Ag-4%TiB_(2)触头材料具有较长的燃弧时间、较大的侵蚀面积和较浅的蚀坑,表明细小的Ag颗粒有助于电弧分散,能够提高材料的耐电弧侵蚀性能。The Ag-TiB_(2) contact materials with Ag powders of different sizes were prepared by spark plasma sintering.The relative density,electroconductivity,and hardness of Ag-4wt%TiB_(2) contact materials were measured,and the arc erosion behavior of the contact materials was analyzed under the vacuum condition.The surface morphologies of Ag-4wt%TiB_(2) contact materials after arc erosion were characterized by the scanning electron microscope.The arc duration was determined by the discharged waveform recorded by a Tektronix TDS-2014 dual channel digital memory oscilloscope,and the arc erosion mechanism was discussed.The results show that the relative density,electroconductivity,and hardness of Ag-4wt%TiB_(2) contact materials are increased with decreasing the Ag powder size.Furthermore,the Ag-4wt%TiB_(2) contact materials prepared from fine Ag powder have longer arc duration,larger erosion area,and shallower erosion pit,suggesting that the fine Ag powder is beneficial for arc dispersion and the improvement in arc erosion resistance.

关 键 词：触头材料 Ag-TiB_(2) Ag粉粒度 电弧侵蚀 

分 类 号：TB34[一般工业技术—材料科学与工程]