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    • 6. 发明公开
    • Electrical contacts and methods of manufacturing the same, and switchgear for electric power
    • Elektrische Kontakte und Verfahren zu deren Herstellung,sowie SchaltwerkfürStrom
    • EP2161728A2
    • 2010-03-10
    • EP09008630.7
    • 2009-07-01
    • Hitachi, Ltd.
    • Kikuchi, ShigeruKajiwara, SatoruSato, TakashiBaba, Noboru
    • H01H1/02H01H1/025H01H1/027
    • H01H1/0203H01H1/025H01H1/027
    • The powder of one of a refractory metal C, Mo, or W and the powder of a highly conductive metal Cu are mixed together, the resulting mixture is pressurized to form a complex pressed body with a relative density of 65% or higher, and the complex pressed body is heated to a temperature not higher than the melting point of Cu to sinter the complex pressed body. The content V (percent by volume) of the refractory metal is within the range obtained from equations (1) and (2) shown below, in which M represents the atomic weight of the refractory metal; a boundary between the refractory metal and highly conductive metal on an arbitrary cross section is physically separated over at least 70% of the length of the boundary. V = M × c / 95.94 8 ≤ c ≤ 32
      Accordingly, the present invention can provide an electrical contact that achieves both low strength, which results in a reduction in force with which a contact bridge formed by melting is broken, and high density for ensuring current-carrying and interruption performance, and thereby enables the electrical current switch and other elements to be substantially compact.
    • 将难熔金属C,Mo或W之一的粉末和高导电性金属Cu的粉末混合在一起,将所得混合物加压以形成相对密度为65%以上的复合压制体, 将复合压制体加热至不高于Cu的熔点的温度,烧结复合体。 难熔金属的含量V(体积%)在下述式(1),(2)的范围内,M表示难熔金属的原子量; 在任意横截面上的难熔金属和高导电金属之间的边界在边界长度的至少70%上物理上分离。 V = M×c / 95.94 8‰¤‰32因此,本发明可以提供实现低强度的电接触,从而导致由熔化形成的接触桥断裂的力的降低和高 密度,用于确保载流和中断性能,从而使得电流开关和其它元件基本上紧凑。