中文摘要：

为了阐明SnO2粒度大小对AgSnO2触头材料电弧侵蚀行为的影响,采用粉末冶金法制备不同SnO2粒度的Ag-4%SnO2（质量分数）触头材料,对触头材料组织进行观察,并对其致密度、硬度和导电率进行测量。对Ag-4%SnO2触头材料进行电弧侵蚀实验,确定燃弧时间和电弧侵蚀前后的质量变化,并对电弧侵蚀后触头材料表面的形貌和成分进行表征。结果表明:细小的SnO2颗粒有助于提高Ag-4%SnO2触头材料的致密度和硬度,但降低了其导电率。随着SnO2粒度的减小,Ag-4%AgSnO2触头材料的燃弧时间变短,质量损失降低,电弧侵蚀面积增大,蚀坑变浅且分散。

英文摘要：

To clarify the effect of SnO2 particle size on the arc erosion behavior of AgSnO2 contact material, Ag?4%SnO2 (mass fraction) contact materials with different sizes of SnO2 particles were fabricated by powder metallurgy. The microstructure of Ag?4%SnO2 contact materials was characterized, and the relative density, hardness and electrical conductivity were measured. The arc erosion of Ag?4%SnO2 contact materials was tested, the arc duration and mass loss before and after arc erosion were determined, the surface morphologies and compositions of Ag?4%SnO2 contact materials after arc erosion were characterized, and the arc erosion mechanism of AgSnO2 contact materials was discussed. The results show that fine SnO2 particle is beneficial for the improvement of the relative density and hardness, but decreases the electrical conductivity. With the decrease of SnO2 particle size, Ag?4%SnO2contact material presents shorter arc duration, less mass loss, larger erosion area and shallower arc erosion pits.