Invastigation Of Common Connector Electrical Contacts Under Sliding

Nowadays,connectors have been widely used in a variety of electric and electronic systems.The performance of connector contacts directly effect the reliability of the whole system.Sliding wear is one of major reasons which leads to failure.It's meaningful to study the sliding characteristic of the common connector contact material under laboratory condition.In this paper,the sliding amplitude has been redesigned since the experiment object is the real connector.The experimental results show that the transformed sliding device can meet the requirements of this study.The sliding characteristics of Flash Au/PdNi/Ni/Cu,PdNi/Ni/Cu,Au/Ni/Cu,Flash Au/Ni/Cu,Sn/Ni/Cu,Cu and Ni/Cu have been studied in this thesis.The results show that the sliding mechanism of small electrical contact is comprising abrasive wear and adhesive wear.The wear rate increases as the contact load rised.The effects of the organic environment,the contact load and the contact material on the performance of the precious metals sliding contact were investigated in this paper.It concluded that gold coating improved the resistance characteristic.This was mainly because the gold coating provided sufficient gold in contact area.The contact resistance remained low and stable during the process of sliding.With the gold thickness and the contact load increased,the contact resistance can be reduced.Palladium has catalytic activity.It can absorb organic gases to generate polymer on the surface of the coating during sliding.On the one side,friction polymer can slow down the wear and tear since it have lubricating effect.On the other side,the presence of the friction polymer can increase the contact resistance.As the contact load increased,the change in sliding properties is not the same.For all metal surfaces,there is a critical contact load which related to the oxidation of adventitious contaminants.The effects of organic environment,the contact load and the contact material on the performance of non-precious metals sliding contact were investigated in this paper.The initial contact resistance of the non-precious metals are high since they are easily form oxide when exposed.Non-precious metals' failure mechanism is due to the oxidation wear,adhesive wear and abrasive wear.The performance of the wear characteristic is mainly related to the hardness.During the sliding process,the oxide mainly gathered in the slide edge accumulation because of the reed and pins' special structure.With the contact load increases,the cycles to get the stable contact resistance reduced while the wear is more serious.Organic environment is mainly acting as the lubricant to the non-precious metals.Organic environment can improve the wear characteristic of the Non-precious metals.