C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/161, 75/1.3
C22C 29/06 (2006.01) C22C 32/00 (2006.01) H01H 1/02 (2006.01)
Patent
CA 1246901
ABSTRACT OF THE DISCLOSURE A novel contact electrode material for vacuum interrupters is disclosed, by which the chopping current value inherent in contact material can be reduced so that it is possible to stably interrupt small lagging current due to inductive loads without generating surge voltages. The material is equivalent or superior to the conventional Cu-0.5Bi material in large current interrupting capability and dielectric strength. The material consists essentially of copper, chromium, iron or molybdenum and metal carbide. The metallographical microstructure is such that copper is infiltrated into a porous matrix formed by mutually bonding chromium powder, iron or molybdenum powder and metal carbide powder in diffusion state. In its manufacturing process, firstly copper is placed onto a powder mixture of chromium, iron or molybdenum, and metal carbide, and then the copper and the powder mixture is heated within a nonoxidizing atmosphere at a first temperature lower than the copper melting point and thereafter again at a second temperature higher than the copper melting point. - 51 -
474028
Kashiwagi Yoshiyuki
Kitakizaki Kaoru
Noda Yasushi
Kabushiki Kaisha Meidensha
Robic Robic & Associes/associates
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