Abstract
Abstract The AgSnO2NiO composites were prepared by internal oxidation method. The effects of different NiO content on the microstructure and mechanical properties of AgSnO2NiO composites were studied. The phase structure and surface morphology of the prepared AgSnO2NiO materials were characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Metallographic Microscopy (MM). The results showed that the AgSnO2NiO composites with different NiO content can be obtained by the process of preoxidation of AgSn alloy powder and internal oxidation of ingot containing Ni. The agglomeration phenomenon of Ni in the silver matrix was serious, which led to the agglomeration of in-situ generated NiO particles after internal oxidation. After the multi-pass drawing, the SnO2 particles dispersedly distributed in the AgSnO2NiO composites and the NiO particles gradually dispersed from the agglomerated state of the sintered ingot billet. The hardness of the prepared AgSnO2NiO composites increased slightly with the increase of NiO content. The mechanical properties test showed that the introduction of NiO particles significantly improved the tensile strength and elongation of AgSnO2 materials to a certain degree. Adding proper amount of NiO is beneficial to improve the overall performance of AgSnO2 materials.
Highlights
The AgSnO2NiO composites were prepared by internal oxidation method
The phase structure and surface morphology of the prepared AgSnO2NiO materials were characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Metallographic Microscopy (MM)
The results showed that the AgSnO2NiO composites with different NiO content can be obtained by the process of preoxidation of AgSn alloy powder and internal oxidation of ingot containing Ni
Summary
The effects of different NiO content on the microstructure and mechanical properties of AgSnO2NiO composites were studied. 0.786 1.572 2.358 3.144 the AgSnO2 electrical contact material produced by the internal oxidation method has better processability and arc erosion resistance [14, 15]. The addition of different metal oxides such as CuO, In2O3, etc., and oxides of rare earth elements (La2O3, CeO2, etc.) can effectively improve the wettability between Ag and SnO2, thereby reducing the contact resistance and temperature rise during arcing [16,17,18,19]. In order to combine the advantages of both AgSnO2 and AgNi electrical contact materials and to obtain a uniform microstructure of fine particles, AgSnO2NiO composites were prepared by internal oxidation combined with high temperature sintering. The result can provide a useful reference for the compound modification method between different silver-metal oxide electrical contact materials
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