Abstract
By using powder metallurgy, new electrical contact materials of Ag-GNP with mass fractions of 0.2%–3% were created. The mechanical and electrical properties of the materials were studied, and the force-thermal-electric coupling fields of the electrical contact process were calculated using the finite element method. The findings demonstrate that GNP can greatly boost the material’s mechanical strength while also increasing its resistivity; nevertheless, concentration levels of less than 3 weight percent do not appreciably impair the silver matrix’s electrical conductivity. The finite element simulation gives the stress field, current density distribution, and temperature field during contact. A comparison of the theoretically calculated contact radius and the simulation results show the same trend of variation. Both the stress field and temperature field are enhanced with increasing GNP content. The temperature rise of the contact may be unfavorable when the GNP content is greater than 1 wt.%.
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