Hitachi Metals, Ltd.

Kurosaki Refractories Co., Ltd.

Tomoyuki Kido

Mitsuru Yano

Katsumi Morikawa

Norio Takahashi

Masatoshi Nakamizo

Masatoshi Kawata

Yoshiyuki Ochi

Toshihide Masuda

A ceramic coating bonded to an iron tubular member comprising a bonding layer formed on a surface of the iron tubular member by a reaction of an iron tubular oxide layer of the iron tubular member and a silicate; and an iron oxide diffusion-preventing layer produced from fine metal oxide particles or an organometallic binder by firing on a surface of the bonding layer. The ceramic coating may further comprises an oxidation-preventing layer, a heat-insulating layer, a refractory layer or a thin dense protective layer. It may be produced by coating the surface of the iron tubular member with a silicate binder to form a layer which is then converted to a bonding layer by a heat treatment in a steam atmosphere; coating the surface of the bonding layer with fine metal oxide particles or an organometallic binder to form an iron oxide diffusion-preventing layer; and after curing and drying firing the resulting ceramic coating in an atmosphere having an oxygen partial pressure of 10 mmHg or less.

Ceramic coating bonded to iron member

A ceramic coating bonded to a metal member comprising a bonding layer formed by the reaction of an oxide layer formed on a surface of said metal member in advance and a silicated; and an anti-oxidizing first ceramic layer formed on said bonding layer and comprising inorganic flaky particles burned to have a cross-linked laminate structure.

Ceramic coating bonded to metal member

An exhaust device whose inner surface is coated with a heat-insulating layer and a refractory layer. Each layer is formed by conducting at least one cycle of the steps of: (a) coating the inner surface with an inorganic binder solution, (b) immediately adhering a coating powder to the binder solution layer so that the powder is fully and uniformly impregnated with the binder solution, and (c) drying and solidifying it by heat treatment. The coating layer does not suffer from cracking, peeling and breakage.

Exhaust device having a heat-insulating layer comprising inorganic

A method of manufacturing a ceramic body having continuous three-dimension through-out holes which can be preferably employed as a filter for filtration of non-metallic inclusions in a molten metal and as a porous plug for introducing a gaseous medium for floating up the non-metallic inclusions. An organic body having a three-dimensional construction is placed in a casting mold, a slip of a ceramic material is poured into the mold, and after drying, the molded body is baked to effect decomposition of the organic porous body. Thus the ceramic body is provided with through-out holes communicating with to each other three-dimensionally together with a high mechanical strength.

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Kitakyushu, Japan

Tomoyuki Kido