Graphite-containing refractory material and method for manufacturing the same.

Abstract

To provide a graphite-containing refractory that exhibits high durability by suppressing propagation of cracks caused by thermal stress even when used for an inner lining refractory for converter furnaces, and also that exhibits high durability, especially when used for a tuyere brick for a converter furnace having a very large internal temperature gradient, wherein the graphite-containing refractory can be manufactured at high manufacturing yields without causing defects such as cracks during production.SOLUTION: The present invention relates to a graphite-containing refractory in which a carbon fiber bundle B is arranged inside a refractory body A, wherein the carbon fiber bundle B is made of a carbon fiber bundle to which no sizing agent is attached at least partially or wholly on an outer surface thereof, preferably partially or wholly on the outer surface thereof and partially or wholly inside the bundle. The non-adherence of the sizing agent partially or wholly on the outer surface of the carbon fiber bundle B helps to: suppress formation of defects such as cracks during production; and increase adhesion between the carbon fiber bundle B and the refractory body A, resulting in a high fracture energy.SELECTED DRAWING: Figure 1

Claims

1. A non-fired graphite-containing refractory material in which a bundle of carbon fibers (B) is arranged inside the refractory body (A), The non-fired graphite-containing refractory material is characterized in that the carbon fiber bundle (B) consists of a carbon fiber bundle in which at least part or all of the outer surface is not coated with a sizing agent, and is bonded to the refractory material body (A) via an adhesive component (c).

2. The unfired graphite-containing refractory material according to claim 1, characterized in that the carbon fiber bundle (B) consists of a carbon fiber bundle in which a sizing agent is not attached to part or all of the outer surface and part or all of the inside of the bundle.

3. The unfired graphite-containing refractory material according to claim 2, characterized in that the carbon fiber bundle (B) contains an adhesive component (c) within the bundle to which the sizing agent is not attached.

4. The non-fired graphite-containing refractory material according to any one of claims 1 to 3, characterized in that the adhesive component (c) is one or more selected from organic resins, inorganic fine particles derived from inorganic sols, organic substances derived from tar and / or pitch, and organic substances derived from organic glue.

5. The carbon fiber bundle (B) is a bundle of carbon fibers having a length of 100 mm or more and a fiber diameter of 1 to 45 μm, and the number of carbon fibers per bundle is 1,000 to 300,000, characterized in that it is an unfired graphite-containing refractory material according to any one of claims 1 to 4.

6. The unfired graphite-containing refractory material according to any one of claims 1 to 5, characterized in that multiple carbon fiber bundles (B) are arranged in parallel at intervals inside the refractory material body (A).

7. The refractory material body (A) is a non-fired graphite-containing refractory material according to any one of claims 1 to 6, characterized in that it contains 1 to 80% by mass of graphite raw material.

8. A converter characterized by comprising an unfired graphite-containing refractory material as described in any one of claims 1 to 7.

9. A molten iron pretreatment container characterized by comprising an uncalcined graphite-containing refractory material as described in any one of claims 1 to 7.

10. A ladle container characterized by comprising a non-fired graphite-containing refractory material as described in any one of claims 1 to 7.

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