Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Takayuki Itotani

Hiroyuki Chibahara

Taiki Donen

Minoru Kobayashi

Satoshi Ochi

Takakazu Harada

Toshimasa Maruyama

Yasutomo Tanihara

Seiichi Miyamoto

Toshifumi Sato

In an electric contact including a base material, high-melting-point substance particles, and an intermetallic compound, the intermetallic compound containing a MnX compound (X represents Te or Se) and a compound of a Mn&#x2014;Cu solid-solution phase and X, is dispersed in the base material. If the Vickers hardness of the high-melting-point substance particles is higher than 0 Hv and lower than 200 Hv, the particle diameter of the high-melting-point substance particles is not smaller than 0.1 &#x3bc;m and not larger than 100 &#x3bc;m. If the Vickers hardness of the high-melting-point substance particles is 200 Hv or higher, the particle diameter is not smaller than 0.1 &#x3bc;m and not larger than 10 &#x3bc;m. The mass of X atoms is not lower than 1.5 mass % and not higher than 15 mass %. The atomic weight ratio Mn/(Mn+X) is not lower than 20 at % and not higher than 80 at %.

Electric contact and vacuum interrupter using same

A fixed electrodeand a movable electrode have coil electrodes formed of plural coil portions installed at both contacts and on a rear surface side in a divided manner in a circumferential direction along peripheries of the contacts such that a longitudinal field is generated in a direction in which the fixed contact and the movable contact come close to and move apart from each other. Protruding portions joined to the contacts are provided to tip ends of the respective coil portions to form joint portions to the respective contacts. A current to be flowed is controlled by changing resistance values between the contacts and the coil electrodes for each joint portion.

Vacuum valve

Growing community of inventors

Tokyo, Japan

Takayuki Itotani