新型Ag-CNTs电接触材料的制备及其性能研究

Preparation and Performance Study of a New Type of Ag-CNTs Electrical Contact Material

摘要: 采用化学沉积包覆和粉末冶金法，研制了一种新型的Ag-CNTs电接触材料.利用电子万能试验机、触点材料测试系统、扫描电镜等分析手段，分析了材料的微观组织和性能.结果表明：新材料具有优异的烧结致密度、电性能和加工性能，热挤压后密度可达理论密度的99.6%、电阻率仅为1.91 μΩ·cm，优于相同工艺制备的Ag-Ni、Ag-SnO₂传统电接触材料.经电弧侵蚀对比试验发现，同等条件下新材料电弧侵蚀量最小，且电寿命为上述2种传统材料的2倍.该材料有望成为一种可替代Ag-Ni、Ag-SnO₂的新型电接触材料.

Abstract: A new type of Ag-CNTs electrical contact material was fabricated by chemical deposition coating and powder metallurgy method. The microstructure and performance of the new material were investigated by electronic testing machine， contact material testing system and scanning electron microscope. The results show that， compared with convenient Ag-Ni and Ag-SnO₂ electrical contact materials prepared by the same process， the new material has superior sintered density，electrical property and processing property. Its density ratio and electrical resistivity is 99.6% and 1.91 μΩ·cm， respec