Alloys or metallic compositions – Copper base – Aluminum – gallium – indium – or thallium containing
Patent
1985-12-16
1989-08-01
Brody, Christopher W.
Alloys or metallic compositions
Copper base
Aluminum, gallium, indium, or thallium containing
420490, 420491, 420494, 420499, 420500, 200266, C22C 900
Patent
active
048531847
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a contact material for vacuum interrupter which is splendid in breakdown voltage and has a high interrupting ability.
2. Background Art
Vacuum interrupts are expanding its application range very rapidly because of no need of maintenance, no environmental pollution and splendid interrupting ability, or the like. And accompanying the above, a larger interrupting capacity and higher breakdown voltage are being demanded. On the other hand, for ability of vacuum interrupter, there is a very great element which is determined by contact material in a vacuum container.
Hitherto as contact material of this kind, material constituted by a combination of such metals being splendid in vacuum breakdown voltage as copper-chromium (hereafter is indicated as Cu-Cr. For other elements and alloys consisting of combinations of other elements are similarly indicated by the element symbols) or the like (Cr, Co, etc.) and Cu being splendid in electric conductivity is often used in a large current range or high voltage range because they are splendid in the interrupting ability and the breakdown ability and the like. However, demands for adaptation to larger current and for higher voltage is further severe, and it is difficult to satisfy the demanded ability by the conventional contact materials. Furthermore, for miniaturization of the vacuum interrupters, the conventional contact characteristics can not be sufficient also, and a contact material having more splendid characteristic is becoming demanded.
DISCLOSURE OF THE INVENTION
The present invention constituted a contact material for vacuum interrupter by containing copper and chromium, and as other component(s) one component selected from a group consisting of silicon, titanium, zirconium and aluminum.
According to the present invention, there is an effect that a contact material for vacuum interrupter which is splendid in breakdown voltage ability and high in interrupting ability is obtainable.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a sectional view showing construction of a vacuum switching tube for applying one embodiment of the invention,
FIG. 2 is an enlarged sectional view of part of an electrode of FIG. 1,
FIG. 3 is a characteristic view showing change of breakdown voltage ability when Si addition amount is changed to an alloy which is a contact material of the present invention wherein Cr amount is fixed at 25 wt %,
FIG. 4 is a characteristic diagram showing change of electric conductivity when Si addition amount is changed to an alloy which is a contact material of the present invention wherein Cr amount is fixed at 25 wt %,
FIG. 5 is a characteristic curve showing change of hardness when Si addition amount is changed to an alloy which is a contact material of the present invention wherein Cr amount is fixed at 25 wt %.
FIG. 6 is a characteristic diagram showing change of interrupting capacity when Ti addition amount is changed to an alloy which is a contact material of the present invention wherein Cr amount is fixed at 25 wt %,
FIG. 7 is a characteristic diagram showing change of electric conductivity when Ti addition amount is changed to an alloy which is a contact material of the present invention wherein Cr amount is fixed at 25 wt %,
FIG. 8 is a characteristic curve showing changes of hardness (A) and breakdown voltage ability (B) when Ti addition amount is changed to an alloy which is a contact material of the present invention wherein Cr amount is fixed 25 wt %.
FIG. 9 is a characteristic view showing change of interrupting capacity when Zr addition amount is changed to an alloy which is a contact material of the present invention wherein Cr amount is fixed at 25 wt %,
FIG. 10 is a characteristic diagram showing change of electric conductivity when Zr addition amount is changed to an alloy which is a contact material of the present invention wherein Cr amount is fixed at 25 wt %,
FIG. 11 is a characteristic curve showing changes of hardness (A) and breakdown voltage ability (B) when Z
REFERENCES:
patent: 3615899 (1971-10-01), Yokohama
patent: 3957453 (1976-05-01), Hassler et al.
patent: 4008081 (1977-02-01), Hundstad
patent: 4014659 (1977-03-01), Hassler et al.
patent: 4517033 (1985-05-01), Okumura et al.
patent: 4575451 (1986-03-01), Naya et al.
Eizo Naya
Masuo Asakawa
Michinosuke Demizu
Mitsuhiro Harima
Mitsuhiro Okumura
Brody Christopher W.
Mitsubishi Denki & Kabushiki Kaisha
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