La元素对ATO/Cu电接触材料润湿性及组织性能的影响

Metal oxides reinforced copper-based composite is one of the most important developing directions of the silver-saving, due to their low-cost, highelectrical conductivity, thermal conductivity and mechanical properties. However, the poor wettability between the reinforcing phase and copper matrix decreases the stability and reliability of the contact materials, which limits their applicants. In this work, Sb-doped SnO₂ (ATO) was employed as the reinforcing phase and the effects of La on the wettability between ATO and Cu matrix at different temperatures were investigated. The microstructure and properties of ATO/Cu electrical contact materials with different content of La were evaluated. The results show that La could improve the wettability between ATO and Cu particles. Increasing the content of La in the matrix could improve the hardness of the composite, however decrease the electrical conductivity. In addition, the addition of La could effectively decrease the contact resistance of ATO/Cu composite, which may be ascribed to the new phases due to the combination of La and ATO.