Toshiba Ceramics Co., Ltd.

Sumitomo Metal Industries, Inc.

Takumi Nishio

Takashi Watanabe

Toshio Kawamura

Tsutomu Nagahata

Kazumi Arakawa

Masuo Sugie

Takashi Matsushita

Kazuhide Kawai

Yoshihisa Kato

Takahiro Katayose

Satoshi Doro

Takafumi Nishibe

Takahiro Fukaya

A refractory composition which is suitable for forming a sliding gate to be used at the bottom of a ladle or tundish is provided. The refractory composition comprises 10 to 30 parts by weight of an alumina-magnesia spinel material containing 40 to 70% by weight of Al.sub.2 O.sub.3, 25 to 60% by weight of MgO and 10% or less of impurities, and 70 to 90 parts by weight of a magnesia material containing at least 90% by weight of MgO, wherein the composition contains 10 to 25% by weight of Al.sub.2 O.sub.3 and 75 to 90% by weight of MgO. 1 to 10 parts by weight of Al.sub.2 O.sub.3 material may be further added together with the alumina-magnesia spinel material and the magnesia material, to form the refractory composition.

Refractory composition

A filler material for filling an outlet aperture of a casting ladle or similar container, comprising a particulate core principally composed of quartz and a coating layer which covers a surface of the core, the coating layer having a multiplicity of fine particles principally made of at least one material selected from materials of feldspar group can be surely taken off from the outlet aperture of a casting ladle or other similar container to allow substantially complete opening of the aperture when the slide gate is opened.

Filler material for filling an outlet aperture of a casting ladle or

A molten metal discharging device comprising:

Molten metal discharging device

A molten metal discharging device including a stationary plate of refractory material and adapted to be mounted at a bottom portion of a container for accommodating molten metal, the stationary plate having a molten metal passage bore for permitting the molten metal from the container to be discharged therethrough, and a slide plate of refractory material slidable along a lower face of the stationary plate and adapted to open or close the passage bore by being slidably displaced relative to the stationary plate, wherein the stationary plate includes a stationary plate main body having the passage bore therein, at least a major part of the main body being made of porous refractory material, the stationary plate main body having a chamber around a circumferential wall part of the passage bore and a gas introduction hole communicated with the chamber for introducing a gas from outside into the chamber, the circumferential wall part having gas supply hole elements for supplying the gas therethrough from the chamber to the passage bore enables to reduce the heat dissipation through the stationary plate and to thereby reduce the risk of clogging of the molten metal passage bore in the stationary plate due to the solidification of the molten metal or the like.

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Toyota, Japan

Takumi Nishio