小容量控制电器用新型AgNi基触头材料的研究

RESEARCH ON THE DEVELOPMENT OF A NEW AgNi BASED CONTACT MATERIAL FOR CONTROL APPARATUS WITH SMALL CAPACITY

探讨了目前小容量控制电器用国产ＡｇＮｉ触头材料在运行过程中存在的关键问题；研究了电器触头的熔焊机理；针对现有国产ＡｇＮｉ触头材料及小容量控制电器的灭弧结构和原理，提出了增加触头抗熔焊性能的新思路，并制作样品。装机试验表明，文章中介绍开发的小容量控制电器用新型ＡｇＮｉ基触头在６６０Ｖ、１６Ａ、ＡＣ－４工作类别下电寿命比原触头的提高５倍以上，其它电接触性能没有下降，制造成本还略有降低。

The main problem of AgNi contact material for control apparatus with small capacity was investigated.Based on the studies of welding mechanism of electrical contacts and the measures of decreasing tendancy to weld of contacts,a new AgNi based contact material for control apparatus with small capacity was developed by diffusing arc root,enhancing wettability between molten silver and contact surface in order to restrain the generation and propagation of micro cracks and holes and controlling content of Ni component and Ni fibre orientation via dopants or manufacturing technology.Experimental results on electrical service life under AC 4 category conducted in low voltage contactors show that the electrical endurance of a new AgNi based material is more than 5 times as that of a conventional one.The remaining characteristics,are still excellent,and the manufacturing cost declines lightly.