Tungsten Copper / Bronze Self-moving Arc Contact

Tungsten copper contact materials have excellent arc erosion resistance, welding resistance and high strength, so it has been widely used in various circuit breakers, vacuum load switch and transformer conversion switch, especially tungsten copper / copper alloy arc contact. With the increasing high-voltage switch level and the switchgear miniaturization trend, the requirements of self-moving arc contact has increased. And with 550KV high-voltage power grid running, the properties requirements of tungsten copper / bronze (QCr0.5) self-moving arc contact has become more and more strict. After processing, self-moving arc contact conducted line cutting or milling that inner diameter will has a significant modification due to the pre-machining process stress and has outer or inner expansion according to different nature of stress. This deformation will affect the movable arc contact with the stationary arcing contact elasticity, lower voltage electrical arcing contacts in the breaking process reliability, thus affecting the overall performance of high-voltage electrical. In addition, Mechanical correction method is only effective on short-term, and it will be installed after the re-deformation with stress relaxation, thereby reducing the overall contact reliability.

Its basic process is: First of all, adopt wet mechanical to mix Cu powder and tungsten powder, and put the mixed powder granulated in the suppression of press-molding mold cavity; the compacted into a green body is sintered graphite boat infiltration in an atmosphere sintering furnace, copper-tungsten alloy prepared by the contact portion, followed by partial sintering conductive rod connected to the contact portion of the copper-tungsten alloy and chrome bronze material to obtain copper tungsten alloy / chrome bronze overall movable arc contacts the workpiece; afterwards, solid solution treatment to tungsten copper / bronze self-moving arc contacts and then roughing, followed by aging treatment; finally, finishing and long the circumference of the workpiece after the partial aliquot line cutting, to obtain a copper tungsten / chromium bronze overall self-elastic movable arc contact.

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