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Metal Working

Getter-device

Solenoid actuator with bleed screw

OF THE SHOWN EMBODIMENT Referring to the drawing more particularly by reference numbers, number 10 ...

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Getter device

Details

Inventors: Kimura, Sakae; Shimura, Masahiro; Okai, Tadatake;
Assignee: Tokyo Shibaura Denki Kabushiki Kaisha (Kawasaki, JP)
Primary Examiner: Schofer; Joseph L.
Assistant Examiner: Barr; J. L.
Attorney, Agent or Firm: Cushman, Darby & Cushman

A getter device is disclosed in which at least on the exposed surface of a getter material filled in a metal getter container and containing a barium-aluminum alloy powder and a nickel powder is formed a gas-impermeable film of a boron compound or a mixture of a boron compound with silicon oxide.

DETAILED DESCRIPTION It is, therefore, the primary object of the present invention to provide a getter device which has resistance to oxidation at high temperatures, which is capable of preventing explosive scattering of the getter material during a getter flash in a vacuum and evolution of hydrocarbon-based gas, and which does not adversely affect other components of the device such as an electron tube.
In order to achieve this object, there is provided according to the present invention a getter device which is characterized by comprising a metal getter container, a getter material filled in said getter container comprising a barium-aluminum alloy and a nickel powder, and a gas-impermeable film covering the exposed surface of the getter material and comprising at least one boron compound selected from the group consisting of boric anhydride, orthoboric acid, metaboric acid, and tetraboric acid.
There is provided according to another aspect of the present invention a getter device which is characterized in that said gas-impermeable film further contains less than 5% by weight of silicon oxide.

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