Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Denki Kaisha

Hiroshi Takayanagi

Tadaki Murakami

Isao Ishii

Yoshikazu Utsumi

Yoshiaki Sakamoto

Tatsuharu Nakamura

Toyoshi Takeuchi

Yoshihiro Murakami

The present invention is a heat treatment jig for use in the baking process, the frit seal process, and the evacuation process during the manufacture of cathode-ray tubes. It comprises a base and one or more support members formed from a novel material comprising mica, talc, orthoboric acid, boric acid anhydride, and zinc oxide molded under heat and pressure. This novel molded material is superior in its mechanical properties to the substances (asbestos tape, asbestos cement, or boron nitride) used for the support members of conventional heat treatment jigs. In addition, it does not pose a danger to health like asbestos products and it is far lower in cost than boron nitride.

Heat treatment jig for use in the manufacture of cathode-ray tubes

An arc resistant insulator composed of a composite composition comprising an insulating base material and a zinc borate hydrate. The insulating base material is composed of aluminum oxide and/or aluminum hydroxide and mica power. The zinc borate hydrate is composed essentially of 2ZnO.3B.sub.2 O.sub.3.3H.sub.2 O. The arc resistant insulator is prepared by mixing the insulating base material with a zinc borate hydrate forming material composed of normal boric acid, boric acid anhydride and zinc oxide and heating and compacting the mixture thus obtained in a closed system at a temperature of at least 155.degree. C. under pressure of at least 50 kg/cm.sup.2.

Arc resistant insulator

Growing community of inventors

Sanda, Japan

Hiroshi Takayanagi