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A super-fine compound powder, Ag/SnO2+La2O3+Bi2O3, has been obtained using the chemical coprecipitationmethod. And a new contact material, Ag/SnO2+La2O3+Bi2O3, was produced by the powder metallurgy method. Its properties are as follows: the density is 9.75-9.93 g/cm3, the resistivity is 2.31-2.55 μΩ·cm, the hardness is 880-985 MPa. Its mi-crostructure shows that the fine oxides have a uniform distribution in the silver matrix. The results of make-break capacityand temperature rise testing show that the new material has better ability of anti-arc erosion and lower temperature rise thanthat of commonly used Ag/CdO.
A super-fine compound powder, Ag / SnO2 + La2O3 + Bi2O3, has been obtained using the chemical coprecipitation method. And a new contact material, Ag / SnO2 + La2O3 + Bi2O3, was produced by the powder metallurgy method. Its properties are as follows : the density is 9.75-9.93 g / cm3, the resistivity is 2.31-2.55 μΩ · cm, the hardness is 880-985 MPa. Its mi-crostructure shows that the fine oxides have a uniform distribution in the silver matrix. The results of make-break capacity and temperature rise testing show that the new material has better ability of anti-arc erosion and lower temperature rise thanthat of commonly used Ag / CdO.