Preparation of rod-like SnO2 powder and its application in Ag-SnO2 electrical contact materials

摘要

In this study, rod-like SnO2 particles with a diameter from 1 to 4 mm and the length from 5 to 50 mm were successfully prepared by chemical precipitation method. Then, SnO2 particles were mixed with silver powder by wet ball milling. After hot pressing, hot-extrusion and drawing, Ag-SnO2 electrical contact material was fabricated. The microstructure, mechanical properties and material transfer of Ag-SnO2 contact material were studied. The results showed that this kind of Ag-SnO2 electrical contact material has good performance, that is, homogeneous microstructure, high hardness HV117.55, low electrical resistivity (2.227 mu Omega x cm) and low material transfer.