新型Ag-CNTs电接触材料的制备及其性能

摘要

采用化学沉积包覆和粉末冶金法,研制一种新型的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1.91μΩ·cm,优于相同工艺制备的Ag-Ni、Ag-SnO2传统电接触材料.电弧侵蚀对比试验表明,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.%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 with electronic testing machine, contact material testing system and scanning electron microscope. The results show that, compared with conventional Ag-Ni and Ag-SnO2 electrical contact materials prepared by the same process, the new material enjoys advantages of superior sintered density, electrical property and processing property. Its density ratio and electrical resistivity are 99.6% and 1.91 μΩ·cm, respectively. The comparative experimental results of arc erosion indicate that the mass loss of the new material by the same arc breaking condition is least and the service life of the material is twice as long as that of the above-mentioned two conventional materials. The newly developed Ag-CNTs may be substituted for Ag-Ni and Ag-SnO 2 as a new electrical contact material.