Title:
METHOD FOR PRODUCING ELECTRODE MATERIAL FOR VACUUM CIRCUIT BREAKER, ELECTRODE MATERIAL FOR VACUUM CIRCUIT BREAKER AND ELECTRODE FOR VACUUM CIRCUIT BREAKER
Document Type and Number:
WIPO Patent Application WO/2011/162398
Kind Code:
A1
Abstract:
Provided are: a method for producing an electrode material for a vacuum circuit breaker, whereby withstand voltage, large current interruption performance and capacitor switching performance can be improved; an electrode material for a vacuum circuit breaker; and an electrode for a vacuum circuit breaker.
The electrode material for a vacuum circuit breaker is produced by a method comprising a mixing step, a press sintering step and a Cu infiltration step. In the mixing step, an Mo powder having a particle diameter of 0.8-6 μm is homogeneously mixed with a thermit Cr powder having a particle diameter of 40-300 μm in such a manner as giving a mixing ratio (Mo:Cr) of 1:1-9:1 and satisfying the weight relation Mo≥Cr. In the press sintering step, the resultant mixture is pressure molded under a press pressure of 1-4 t/cm2 to give a molded article. Next, said molded article is sintered by maintaining the same at a temperature of 1100-1200oC for 1-2 hours in a heating furnace to give a calcined article. In the Cu infiltration step, a thin Cu plate is placed on said calcined article and maintained at a temperature of 1100-1200oC for 1-2 hours in a heating furnace so that Cu is liquid-phase sintered and infiltrated into the calcined article.
A contact material of an electrode for a vacuum circuit breaker has an integral structure consisting of a central member and a Cu-Cr outer peripheral member, said central member having been produced as described above and comprising 30-50 wt% of Cu of a particle diameter of 20-150 μm and 50-70 wt% of Mo-Cr of a particle diameter of 1-5 μm, while said outer peripheral member being formed of a material, which is highly compatible with the central member, shows excellent interruption performance and has high withstand voltage, and being provided outside the central member and fixed thereto.
Inventors:
NODA, Yasushi (C/O Kokubu works of JAPAN AE POWER SYSTEMS CORPORATION, 1-1 Kokubu-chi 1-chome, Hitachi-sh, Ibaraki 35, 〒3160035, JP)
野田 泰司 (〒35 茨城県日立市国分町１丁目１番１号株式会社日本ＡＥパワーシステムズ 国分事業所内 Ibaraki, 〒3160035, JP)
野田 泰司 (〒35 茨城県日立市国分町１丁目１番１号株式会社日本ＡＥパワーシステムズ 国分事業所内 Ibaraki, 〒3160035, JP)
Application Number:
JP2011/064608
Publication Date:
December 29, 2011
Filing Date:
June 20, 2011
Export Citation:
Assignee:
JAPAN AE POWER SYSTEMS CORPORATION (9-1Shibaura 3-chome, Minato-ku Tokyo, 23, 〒1080023, JP)
株式会社日本ＡＥパワーシステムズ (〒23 東京都港区芝浦三丁目９番１号 Tokyo, 〒1080023, JP)
NODA, Yasushi (C/O Kokubu works of JAPAN AE POWER SYSTEMS CORPORATION, 1-1 Kokubu-chi 1-chome, Hitachi-sh, Ibaraki 35, 〒3160035, JP)
株式会社日本ＡＥパワーシステムズ (〒23 東京都港区芝浦三丁目９番１号 Tokyo, 〒1080023, JP)
NODA, Yasushi (C/O Kokubu works of JAPAN AE POWER SYSTEMS CORPORATION, 1-1 Kokubu-chi 1-chome, Hitachi-sh, Ibaraki 35, 〒3160035, JP)
International Classes:
C22C1/04; B22F1/00; B22F3/26; C22C9/00; C22C27/04; C22C30/02; H01H33/664
Attorney, Agent or Firm:
TAKADA, Yukihiko (2-6 O-machi 1-chome, Mito-shi Ibaraki, 62, 〒3100062, JP)
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Claims: