Study On New Low-Electrical Contacted Compounded Material On Copper-Based

Contact components are pivotal element of switch wiring. To great extent the service life and major properties of switch wiring are decided by contact materials. With the improvement of the electric contact manufacture and the increase of variety, especially meeting the need of saving silver and other noble metals, people attach importance to the research of copper-based contact materials instead of silver.Perfect electrical contact materials must meet the various needs of synthetic performance, such as physical performance, mechanical performance, electrical contact performance, chemic performance, manufacture performance and so on. These demands are diversiform, and some performance needs are contradiction to each other, so only one material is impossible to content these requirements. Therefore, generally adopting powder metallurgy technology, by this method two or more kinds of metals or alloys which have different performances and can't dissolve in each other or solubility is little can be combined to produce composite materials. In this way the material can accord the above-mentioned demands of major properties, and achieve optimal synthetic performance.This article based on the requirements of electric contact's performance, added many elements to copper-base, adopted powder metallurgy technology and made a new type copper-based electric contact composite material which has excellent performance with no silver. This material that possess upper conductivity, preferable oxidation resistance and anti-welding, lower tangent resistance and fine mechanics performance can meet the usable requirements of electric contact in low-voltage and substitute silver-based electric contact materials which has been used extensively. Meanwhile it also can advance the use properties of switch wiring, and reduce the cost of electric contact element.Contact materials are demanded to have finer electric erosion resistance and anti-welding properties, but pure copper can't meet the requirement easily. So it is necessary to choose an element with low melting point, which can be more easily oxidized, burnt or vaporized than copper under the melting point and the oxide of which can be easily break up. When the oxide is decompounding, the electric arc's energy would reduce and extinguish easily. When the electric arc goes out, the cupreous molten would curdle. And the superfluous oxygen is expelled, forming small or tiny orifice. This lacunaris...