微动诱发的触点电接触间歇失效现象研究

金属触点是电气电子工程领域中导通电流、传递信号的关键,机械振动应力环境产生的微动将使系统的电接触性能逐步退化,并诱发触点间发生间歇失效现象.借助电动振动台设计了触点微动磨损测试分析系统,以铜镀金触点为研究对象,获得了接触电阻全寿命周期内的退化过程.结合接触电阻与SEM/EDX分析结果确定了微动频率、微动幅值对触点磨损发生间歇失效的条件及电接触间歇失效机理.

Intermittency Phenomenon of Electrical Contacts Induced by Fretting Behavior

Metal contact plays a key role in conducting current and transmitting signals in electrical and electronics engineering fields. However, fretting caused by mechanical vibration stress degrades the electrical contact behavior gradually, and induces the intermittency phenomenon. This paper investigated the fretting behavior of Au-plated copper contacts and the variation of contact resistance was obtained by using an electro dynamic shaker. By analyzing contact resistance and worn surface morphology, the relationship between fretting frequency and amplitude inducing the intermittency phenomenon and the intermittency failure mechanism was discussed.