Asahi Glass Company, Limited

Kazuo Hamashima

Michito Sasaki

Yasuharu Hirahara

Makoto Imakawa

Kimihiko Sato

Yasuo Shinozaki

Naruaki Tomita

Noritoshi Horie

Akifumi Niwa

Yukinori Kutsukake

Koji Obayashi

Hajime Ito

The present invention provides a new method for airtightly joining a hollow tube made of a reinforced platinum and a flange made of platinum or a platinum alloy, which prevents decreasing of mechanical strength of the hollow tube made of a reinforced platinum due to its joining with a flange. A method for airtightly joining a hollow tube made of a reinforced platinum with a flange made of platinum or a platinum alloy, which is a method for airtightly joining the outer periphery of a hollow tube made of a reinforced platinum produced by dispersing metal oxides in platinum or a platinum alloy, with a flange made of platinum or a platinum alloy, the method comprising a step of shrink-fitting a ring made of platinum or a platinum alloy to the outer periphery of the hollow tube, a step of heating the hollow tube to which the ring is shrink-fit at from 1,150 to 1,450&#xb0; C. for from 1 to 10 hours, and a step of welding the flange made of platinum or a platinum alloy to the outer periphery of the ring.

Method for airtightly joining reinforced platinum hollow tube with platinum flange

The present invention provides a A metal conduit for molten glass and a vacuum degassing apparatus are disclosed, which are capable of coping with extension and contraction, and vibration. By disposing at least one convex portionso to have a height of 4 mm or above in a radial direction and continuously extend in a peripheral direction, it is possible to absorb thermal expansion and contraction without changing the entire length of the metal conduitand to suppress from the metal conduitfrom vibrated even when molten glassis conveyed by the metal conduit. By employing the metal conduitstated earlier in an upstream conveying pipeA, an uprising pipeU, a vacuum degassing vessel, a downfalling pipeL, a downstream conveying pipeB or the like in a vacuum degassing apparatus, it is possible to cope with thermal expansion and contraction, and vibration caused when conveying molten glass

Conduit for molten glass, connecting conduit for molten glass and vacuum degassing apparatus

A conduit for molten glass, a molten glass degassing method and a sub-atmospheric apparatus are provided, which are able to produce homogenous and good quality glass at low cost. A conduit for molten glass, which is capable of flowing molten glass in a horizontal direction, and to which vertical pipes are connectable, is disposed in a substantially horizontal direction. The conduit for molten glass can increase the area of a free surface of the molten glass by setting a width W at a larger value than a height H in cross-section and having an outline in cross-section comprising a convex curve. When the conduit for molten glass thus configured is used as a sub-atmospheric apparatus, it is possible to degas the molten glass effectively. Additionally, it is possible to have a sufficient strength since the convex curve forming the cross-section is elliptical. Further, it is possible to reduce costs by decreasing the amount of metal required for forming the cross-section.

Conduit for molten glass, molten glass degassing method and molten glass degassing apparatus

The injection sleeve comprises: a cylindrical cermet sintered body comprising a hard ceramic phase whose major components are at least one selected from the group consisting of a complex boride of Ni and Mo, a complex boride of Ni and W and a complex boride of Ni, Mo and W and a metal matrix phase consisting of a solid solution whose major components are Ni and Mo. The cylindrical cermet sintered body contains the hard ceramic phase in an amount of not less than 50% by weight and not more than 90% by weight.

Injection sleeve for die casting and a method of casting an aluminum or

A complex boride cermet having high strength and high toughness, which comprises a hard phase composed mainly of a boride of (Mo.sub.1-x W.sub.x).sub.2 NiB.sub.2 formed by substituting a part of Mo of Mo.sub.2 NiB.sub.2 by W, and a matrix alloy phase composed mainly of Ni and containing Mo, and a complex boride cermet comprising a hard phase composed mainly of Mo.sub.2 NiB.sub.2 or (Mo.sub.1-x W.sub.x).sub.2 NiB.sub.2 and a matrix of an alloy phase composed mainly of Ni and containing Mo, which is characterized in that carbon or/and nitrogen, and optionally at least one metal selected from the metals of Groups 4B and 5B and Cr, are incorporated to further improve the strength and toughness. Such complex boride cermet has high strength and high toughness and maintains such properties even at elevated temperatures of from 600.degree. to 900.degree. C. Also disclosed is a process for producing a complex boride cermet containing carbon or/and nitrogen, and optionally at least a carbide or/and a nitride of a metal selected from the metals of Groups 4B, 5B and 6B are added to the starting material.

Complex boride cermets and processes for their production

A ZrB.sub.2 -containing sintered cermet comprising zirconium diboride partially substituted by at least one member selected from the group consisting of chromium boride, molybdenum boride and tungsten boride, and a binding component containing at least one member selected from the group consisting of metals of Group VIII of the periodic table.

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Yokohama, Japan

Kazuo Hamashima