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The silver contact refers to the point of intersection where the electronic appliances are disconnected and contacted when they are opened and closed. Since the metal conductor terminal is prone to instantaneous heat and sparks at the moment of contact, the silver contact point is prone to oxidation and electrolysis in the multi-frequency process of use, so the Electrical Silver Contact is increased and thickened, or polymer metal is used Manufacturing (copper and silver are the most common materials), so this Precision Electrical Contacts made of polymer metal or a point thickened with the same material is called Electrical Silver Contacts.
There are many factors that affect Electrical Contacts resistance. In order to facilitate a systematic grasp, the main factors will be reviewed here.
1. Electrical Contact Rivet materials (including surface coating materials)
In order to prevent cold welding of the contacts, it is necessary to use Silver Coated Electrical Contacts materials with higher hardness, such as rhodium/gold-cobalt alloys. However, in order to obtain low contact resistance and improve contact performance, the hardness of the material should not be too high. Therefore, it should be selected according to actual needs. The chemical stability of the material of Silver Electronic Contact should be good, the anti-pollution, corrosion resistance, and oxidation resistance should be strong, the conductivity of the material should be good, and the resistivity should be low to meet the requirements of small and stable contact resistance.
2. Silver Contact Points pollution
Pollutants include dust, moisture, fibers, organic gas liquids, etc., come from the surrounding environment, processing technology, and the structural materials of the relay itself (such as insulating materials). Pollution is an important factor affecting Silver Electrical Contacts resistance, which will produce larger membrane resistance. And chemical corrosion, increase contact resistance and reduce life span. Therefore, clean production and ultra-clean production are required to reduce pollution. The use of full sealing technology or contact system, electromagnetic system separate sealing technology is one of the anti-pollution measures.
3. Electrical Contacts temperature
The increase in the surface temperature of the Oxidized Electrical Contact (including the increase in the ambient temperature and the temperature of the State or Moving Silver Contact itself) will cause the surface condition and Silver Alloy Electrical Contact Rivets area to change. When the Electrical Silver Contacts pressure is constant, the temperature rise will increase the resistance, so the Silver Contact Rivet resistance will increase. When the temperature rises to a certain level, the Point Contact will be softened, the Contact Point area will increase, and the Silver Contact Rivet resistance will decrease. In addition, the increase in temperature will aggravate the oxidation and chemical corrosion of the Cold Headed Bimetal Contacts metal, which is not conducive to the stability and reliability of the work. Measures to improve heat dissipation conditions include: filling high-pressure gas or blackening the cover.
Contact Information:
Mr.Terry Young (Sales Manager)
Apollo Electronic Components (Xiamen) Co.,Ltd
Xiamen Apollo Stamping Welding Technology Co., Ltd
Add:225#,Jinshang Road,Huli District,Xiamen City,Fujian Province,China,361009
Tel&Fax: 0592-5765084, Mob/WhatsApp/WeChat: 0086-13859903038 ,QQ: 1260358661
Email: yfd@china-electronic-components.com
Web: www.china-electronic-components.com , www.stamping-welding.com
Since 1990,professional in Silver Contact Rivet&Core&Screw Terminal for Relay&Switch&Contactor ect Stamping&Welding solutions !