High-dispersity high-strength silver tin oxide contact material and preparation method thereof

The invention belongs to the technical field of electric contact materials, and particularly relates to a high-dispersity high-strength silver tin oxide electric contact material and a preparation method thereof. According to the method, the surfaces of the atomized and oxidized alloy particles are wrapped with the pure silver layers, then high-energy ball milling is conducted, the uniform pure silver layers on the surfaces of the alloy particles greatly overcome the defects that the plasticity and the machining performance of the material are poor, and stannic oxide is small in mass point and high in dispersity. Meanwhile, a spindle is sintered under the high-temperature and overpressure condition, the internal bonding strength of a pressed blank is greatly improved, and compared with the prior art that no-pressure sintering is adopted, material densification is achieved through cold re-pressing; the bonding strength of the material is greatly improved through overpressure sintering, the material is highly d