Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Denki Kaisha

Isao Ishii

Tadaki Murakami

Yoshiaki Sakamoto

Hiroshi Takayanagi

Osamu Hayashi

Kazuo Okahashi

Shizutaka Nishizako

Toshiyuki Kobayashi

Yoshikazu Utsumi

Yasuhiko Ikeda

Toyoshi Takeuchi

Yoshihiro Murakami

Tatsuharu Nakamura

An insulating pipe joint is disclosed. The joint comprises a first tubular member, a second tubular member comprising a cylinder having the same inside diameter as that of the first tubular member and an annular metal stopper at one end of said cylinder, and an insulator made of a glass/mica composition and a cured organic, solventless resin. The annular metal stopper has an inside diameter larger than the outside diameter of the first tubular member, and the annular metal stopper nests the first tubular member with a space left between them. The insulator fills the space to hold the first and second tubular members in position and provide air- and water-tightness, and secures the insulation creeping distance between each tubular member.

Insulating pipe joint

A process for preparing a heat resistant soft composite which comprises hot-pressing a mixture comprising talc powder and mica powder as major components and a bonding material composed of normal boric acid, boric acid anhydride and zinc oxide, at a temperature of from 160.degree. to 200.degree. C. under pressure of from 50 to 100 kg/cm.sup.2 to form a composite, and subjecting the composite to heat treatment at a temperature of from 450.degree. to 500.degree. C.

Process for preparing a heat resistant soft composite

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

A calcined member for arc-extinguishing chambers which are installed in electromagnetic contactors and magnetic circuit breakers for high-voltage applications. The calcined member consists of an inorganic composite material obtained by molding and heat-treating a starting material under pressurized condition, the starting material comprising 10 to 50% by weight of a mica powder as a base material, 10 to 50% by weight of a magnesium oxide as a charging material, and 25 to 60% by weight of a mixture powder of boric acid, boric anhydride and zinc oxide as a binder.

Calcined member for arc-extinguishing chambers

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

Amagasaki, Japan

Isao Ishii