Abstract
Due to the shortcomings of AgSnO2 as a contact material, models of SnO2, Y-SnO2, Mo-SnO2, and Y-Mo-SnO2 were built to calculate their electrical and mechanical properties based on the first principles of density functional theory. The Y-Mo co-doped SnO2 was the most stable of all the models according to the enthalpy change and the impurity formation energy. By analyzing the energy band structure and the density of states, it was shown that the doped models are still direct bandgap semiconductor materials. The valence band moved up and the conduction band moved down after doping, reducing the band gap and enhancing conductivity. With the reduced energy for carrier transition, the electrical performance of Y-Mo co-doped SnO2 was improved best. The mechanical properties of SnO2 were completely improved by Y-Mo co-doping according to calculation results. The doped SnO2 materials were prepared by the sol-gel method, and the doped AgSnO2 materials were prepared by the powder metallurgy method. X-ray diffraction, hardness, conductivity and wettability experiments were undertaken, with experimental results showing that AgSnO2 can be improved comprehensively by Y-Mo co-doping, verifying the conclusions of the simulation. Overall, the present study provides an effective method for the preparation of high-performance contact materials.
Highlights
Among the most frequently used electrical contact materials, AgCdO is widely utilized in various situations requiring good welding resistance, arc erosion resistance and small contact resistance
It can be seen from the figure that the diffraction peak position of doped SnO2 powder corresponded to the diffraction peak positions of SnO2, indicating that doping elements did not change the crystal structure of SnO2 when doped into SnO2 by the sol-gel method
2 contact, A SigmaScope metal conductivity tester was used indicating to measurethat the doping conductiveffectively improve conductivity of the AgSnO2 contact material
Summary
Among the most frequently used electrical contact materials, AgCdO is widely utilized in various situations requiring good welding resistance, arc erosion resistance and small contact resistance. In addition to developing the velopinging thethe preparation methods, has been focus on adding other elements to preparation methods, there has been focus on adding other elements to improve the improve the performance of AgSnO2 contact materials. It has been found that the rare earth elements have strong have strong chemical activity and can react with other impurities in the contact material chemical activity and can react with other impurities in the contact material to form rare to form rare earth oxides These rare earth oxides accumulate on the surface of the contact earth oxides.
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