Electrical contact for use in a circuit breaker and a method...

Details Electrical contact for use in a circuit breaker and a method... Electrical contact for use in a circuit breaker and a method...

H - Electricity

01

H

H01H 1/02 (2006.01) H01H 1/025 (2006.01) H01H 1/027 (2006.01) H01H 11/04 (2006.01) H01H 1/023 (2006.01)

Patent

CA 2222057

An electrical contact for use in an electrical switching device is provided having low contact resistance, high wear resistance and high anti-weld characteristics. The contact includes a material composition of between 0.2 and 8 % by weight Gr, between 10 and 90 % by weight W and the remaining mixture consisting of Ag. The contact is manufactured using a process which yields a unique microstructure characterized by not having an interconnected Gr network around the Ag thereby providing a strong Ag to Ag bond. This process includes the steps of adding the appropriate amounts of Ag, W and Gr powder material together, blending together under low shear conditions to provide a homogeneous powder mixture while prohibiting the Gr from smearing onto the Ag, pressing the material mixture to form a contact, and then sintering and coining the contact.

L'invention a trait à un contact électrique, utilisable dans un dispositif de commutation électrique, à faible résistance de contact, très résistant à l'usure et doté de propriétés anti-soudage élevées. Ce contact est constitué de graphite, entre 0,2 et 8 % en poids, et de tungstène, entre 10 et 90 % en poids, le reste du mélange consistant en de l'argent. On fabrique ce contact au moyen d'un procédé permettant d'obtenir une microstructure unique caractérisée par l'absence d'une réseau interconnecté de graphite autour de l'argent, ce qui se solde par une liaison étroite argent-argent. Ce procédé consiste à ajouter les uns aux autres des volumes convenables d'argent, de tungstène et de graphites pulvérulents, à les mélanger dans des conditions de cisaillement peu importantes pour constituer un mélange pulvérulent homogène tout en empêchant le graphite de venir tacher l'argent et à presser le mélange pour former le contact et enfin à fritter ce dernier et à le repasser à la presse.

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