# US 8,465,720 B2 · Aluminum oxycarbide composition and production method therefor

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 8,465,720 B2
- Document ID: US8465720B2
- Status: Granted
- Kind: B2
- Application number: 13/262,133
- Filed: 2010-03-30
- Published: 2012-02-09
- Granted: 2013-06-18
- Earliest claimed: 2009-03-30
- Assignees: Krosakiharima Corporation
- Applicants: Keiichiro Akamine; Katsumi Morikawa; Joki Yoshitomi; Yoshihiko Uchida
- Inventors: Keiichiro Akamine; Katsumi Morikawa; Joki Yoshitomi; Yoshihiko Uchida
- Web page: https://patentgrep.com/patent/US8465720B2

## CPC

- C04B 35/62665: {Flame, plasma or melting treatment}
- C01B 32/907: Oxycarbides; Sulfocarbides; Mixture of carbides
- C04B 35/56: based on carbides {or oxycarbides (containing free metal binder C22C29/00)}
- C04B 35/5603: {with a well-defined oxygen content, e.g. oxycarbides}
- C04B 35/62635: {Mixing details}
- C04B 35/63496: {Bituminous materials, e.g. tar, pitch}
- C04B 35/653: Processes involving a melting step
- C04B 2235/3217: Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B 2235/422: Carbon
- C04B 2235/424: Carbon black
- C04B 2235/425: Graphite
- C04B 2235/5292: Flakes, platelets or plates
- C04B 2235/5427: millimeter or submillimeter sized, i.e. larger than 0,1 mm
- C04B 2235/5436: micrometer sized, i.e. from 1 to 100 micron
- C04B 2235/5445: submicron sized, i.e. from 0,1 to 1 micron
- C04B 2235/5472: Bimodal, multi-modal or multi-fraction
- C04B 2235/77: Density
- C04B 2235/80: Phases present in the sintered or melt-cast ceramic products other than the main phase
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}

## Abstract

Provided is an aluminum oxycarbide composition production method capable of increasing a yield of Al4O4C while reducing a content rate of Al4C3 and achieving high productivity, and an aluminum oxycarbide composition. The method comprises: preparing a blend substantially consisting of a carbon-raw material having a mean particle diameter of 0.5 mm or less and an alumina-raw material having a mean particle diameter of 350 μm or less, wherein a mole ratio of the carbon-raw material to the alumina-raw material (C/Al2O3) is in a range of 0.8 to 2.0; homogeneously mixing the blend to allow a variation in C component to fall within ±10%; and melting the obtained mixture in an arc furnace at 1850° C. or more.

## Claims

### Claim 1

A method of producing an aluminum oxycarbide composition, comprising:
preparing a blend substantially consisting of a carbon- raw material having a mean particle diameter of 0.5 mm or less and an alumina- raw material having a mean particle diameter of 350 μm or less, wherein a mole ratio of the carbon- raw material to the alumina- raw material (C/Al2O3) is in a range of 0.8 to 2.0; homogeneously mixing the blend to allow a variation in C component to fall within ±10%; and melting the obtained mixture in an arc furnace at 1850° C. or more.

### Claim 2 (depends on 1)

The method as defined in claim 1, wherein the mean particle diameter of the carbon- raw material is in a range of 0.5 μm to 0.5 mm, and the mean particle diameter of the alumina- raw material is in a range of 0.5 μm to 350 μm.

### Claim 3 (depends on 1)

The method as defined in claim 1, wherein the mole ratio of the carbon- raw material to the alumina- raw material (C/Al2O3) is in a range of 1.0 to 1.8.

### Claim 4

An aluminum oxycarbide composition produced using an arc furnace, which has a chemical composition consisting of: 95 mass % or more of a total of C and Al2O3; 45 mass % or more of Al4O4C as a mineral phase; and 10 mass % or less of other mineral phase, with the remainder being corundum, the aluminum oxycarbide composition having a degradation rate of 3 mass % or less as measured in a magnesia clinker slaking test according to the Gakushin-method 4.

### Claim 5 (depends on 4)

The aluminum oxycarbide composition as defined in claim 4, which has an apparent porosity of 3.5% or less.

### Claim 6 (depends on 4)

The aluminum oxycarbide composition as defined in claim 4, which has an apparent specific gravity of 3.20 or less, wherein C as the chemical component is contained in an amount of 2.5 to 5.5 mass %.

### Claim 7 (depends on 4)

The aluminum oxycarbide composition as defined in claim 4, which is used for a carbon-containing refractory material.

### Claim 8 (depends on 2)

The method as defined in claim 2, wherein the mole ratio of the carbon- raw material to the alumina- raw material (C/Al2O3) is in a range of 1.0 to 1.8.

### Claim 9 (depends on 5)

The aluminum oxycarbide composition as defined in claim 5, which has an apparent specific gravity of 3.20 or less, wherein C as the chemical component is contained in an amount of 2.5 to 5.5 mass %.

### Claim 10 (depends on 9)

The aluminum oxycarbide composition as defined in claim 9, which is used for a carbon-containing refractory material.

### Claim 11 (depends on 5)

The aluminum oxycarbide composition as defined in claim 5, which is used for a carbon-containing refractory material.

### Claim 12 (depends on 6)

The aluminum oxycarbide composition as defined in claim 6, which is used for a carbon-containing refractory material.