Toshiba Monofrax Co., Ltd.

Kimio Hirata

Shigeo Endo

Yasuo Saito

Shinji Tsuchiya

Haruo Kawashima

Akira Itoh

Shozo Seo

Yasuo Misu

Takao Uchiya

Masaki Takemoto

Hideo Yanagi

Yoshizo Orimo

A .beta.-alumina electrocast refractory formed of a composition of 91-95 wt. % of Al.sub.2 O.sub.3, 2.0 wt. % or less of K.sub.2 O, 4.0-7.0 wt. % of Na.sub.2 O and K.sub.2 O in total, 0.15-2.0 wt. % of BaO, SrO and CaO in total, and 0.1 wt. % or less of Fe.sub.2 O.sub.3 and TiO.sub.2 in total.

Beta-alumina electrocast refractories

High-zirconia fused refractories consist essentially of 85-96 wt % of ZrO.sub.2, 3-8 wt % of SiO.sub.2, 0.1-2 wt % of Al.sub.2 O.sub.3, 0.05-3 wt % of B.sub.2 O.sub.3, 0.05-3 wt % of BaO, SrO and MgO in total, 0.05 wt % or more of Na.sub.2 O, 0.05-0.6 wt % of Na.sub.2 O and K.sub.2 O in total, and 0.3 wt % or less of Fe.sub.2 O.sub.3 and TiO.sub.2 in total, and does not substantially contain P.sub.2 O.sub.5 and/or CuO.

High-zirconia fused refractories

A method of producing an electrocast brick or other ceramic shape, and the ceramic shape produced thereby, wherein the electrocast brick or other ceramic shape is cast in a mold which is formed, with a predetermined cavity shape and size, of quartz glass particles; the ceramic material of the ceramic shape may be Al.sub.2 O.sub.3 -ZrO.sub.2 -SiO.sub.2 ceramic, Al.sub.2 O.sub.3 -SiO.sub.2 ceramic or other heat meltable ceramic materials.

Method of producing a ceramic shape and that ceramic shape

A molten fiber material flow is rendered into a plurality of fibers by means of a liquid jet such as water jet in place of a pressurized gas or air. The flow moves downwardly in a vertical direction while the water jet cuts it at an inclined angle. The water jet is formed by a single nozzle or plural nozzles of a flat-jet or round-jet type.

Method and apparatus for producing fibers

In a refractory brick assembly for a heat regenerator, a plurality of brick units are assembled so as to form many long vertical gas flow passages. Each outer wall of the brick units has four corner portions each of which has a plurality of convex and concave strips. That can engage with each other so as to hold the brick units due to the friction between them. A high projection is formed on at least one of the inner and outer walls for producing a turbulent flow.

Refractory brick assembly for a heat regenerator

A method for manufacturing a fused cast refractory article including the steps of pouring a molten refractory material into a cavity of a mold including a casting sand held by a negative pressure applied through the sand and against a thermoplastic film which surrounds the mold cavity, casting and cooling off the refractory material, wherein the negative pressure is maintained after the casting. The mold includes an upper mold portion including a frame, a casting sand, and a thermoplastic film; a bottom mold portion including a frame, a casting sand and a thermoplastic film; and a cavity defined by the thermoplastic film between the upper and bottom mold portion and having an inlet opening.

Method for manufacturing a fused cast refractory

In a heat regenerator, a unit body of a refractory unit has an upper end surface (1a), a lower end surface (1b), an outer wall (1c), an inner wall (1d) and a flow passage (7) which is formed by the inner wall (1c) and extends between both end surfaces (1a, 1b). The outer wall (1c) includes a series of concave and convex strips (4). The inner wall (1d) includes a series of concave and convex strips (5).

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Katori, Japan

Kimio Hirata