In this paper, the relationship between additive particle size and properties of Ag-SnO2 contact materials was studied. La2O3 and Fe2O3 were selected as additives for contact materials, and the proportion of additives were determined by wettability experiment results; Ag-SnO2 contact materials were successfully fabricated by the powder metallurgy method, and the physical and electrical contact properties of Ag-SnO2 contact materials with five additive particle sizes were investigated. The results show the influence of additives on the properties of Ag-SnO2 contact materials are disparate, the contact resistance and arc energy are smaller and more stable when the additive particle size is about 500 nm. For further proving this conclusion, the arc-eroded surface morphologies of the doped AgSnO2 contact materials were investigated by scanning electron microscopy (SEM), which indicated that the properties of two kinds of Ag-SnO2 contact materials could be improved significantly by selecting appropriate additive particle size.
In this paper, AgSnO 2 contact materials doped with Bi 2 O 3 , CeO 2 , La 2 O 3 and TiO 2 were prepared by powder metallurgy. The arc time, arc energy and welding force of the four contact materials were measured, and the arc combustion images and surface microstructure were photographed, which were used to investigate the effects of different additives on the arc properties of contact materials. The JF04C electrical contact material testing system was used to measure arc parameters, high-speed camera and scanning electron microscope were used to capture arc image and surface morphology, respectively. The obtained image was processed using an image processing method based on mathematical morphology. The arc area change was obtained by arc image processing, and then the arc combustion process was analyzed. Combined with arc parameters, arc area and microstructure analysis, the advantages and disadvantages of the four-contact materials doping with different additives against arc erosion were investigated. The results show that the AgSnO 2 /Bi 2 O 3 and AgSnO 2 /CeO 2 contact materials have strong arc erosion resistance among the four contact materials.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.