Refractory for casting, nozzle for casting and sliding nozzle plate using same

Patent metadata

Field	Value
Publication number	US-9815741-B2
Application number	US-201515128265-A
Country	US
Kind code	B2
Filing date	Feb 12, 2015
Priority date	Mar 31, 2014
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

A refractory to be used repeatedly or for a long period of time, such as a refractory for casting, especially a nozzle for casting and an SN plate, has improved tolerance. The refractory for casting contains Al 4 O 4 C in the range of 15 to 60% by mass, both inclusive, an Al component as a metal in the range of 1.2 to 10.0% by mass, both inclusive, and a balance including Al 2 O 3 , a free C, and other refractory component; a sum of Al 4 O 4 C, Al 2 O 3 , and the Al component as a metal is 85% or more by mass; and a content of Al 4 O 4 C (Al 4 O 4 C), a content of the Al component as a metal (Al), and a content of the free carbon (C). The contact of the free carbon satisfies the following Equation 1 and Equation 2:

1.0≦C/(Al 4 O 4 C×0.038+Al×0.33) (Equation 1)

and

1.0≧C/(Al 4 O 4 C×0.13+Al×0.67) (Equation 2).

First claim

The invention claimed is:

1. A refractory for casting, wherein the refractory for casting contains Al 4 O 4 C in the range of 15 to 60% by mass, both inclusive, an Al component as a metal in the range of 1.2 to 10.0% by mass, both inclusive, and a balance comprising Al 2 O 3 , a free C, and other refractory component; a sum of Al 4 O 4 C, Al 2 O 3 , and the Al component as a metal is 85% or more by mass; and a content of Al 4 O 4 C (Al 4 O 4 C), a content of the Al component as a metal (Al), and a content of the free C (C) satisfy following Equation 1 and Equation 2:
1.0≦C/(Al 4 O 4 C×0.038+Al×0.33)  Equation 1

1.0≧C/(Al 4 O 4 C×0.13+Al×0.67)  Equation 2.

2. The refractory for casting according to claim 1 , wherein the Al 4 O 4 C is derived from an Al 4 O 4 C-containing raw material particle produced by an electromelting method.

3. The refractory for casting according to claim 2 , wherein a size of an Al 4 O 4 C crystal in the Al 4 O 4 C-containing raw material particle is 20 μm or more as an average diameter when a cross section of the Al 4 O 4 C crystal is converted to a circle.

4. The refractory for casting according to claim 1 , wherein the other refractory component in the balance is one or more of the following materials: MgO, SiO 2 , a tetragonal or a monoclinic ZrO 2 , SiC, B 4 C, BN, Si 3 N 4 , and a metal Si.

5. The refractory for casting according to claim 1 , wherein a metal Si is contained therein with a weight ratio of the metal Si to the Al component as a metal in the range of 0.1 to 2, both inclusive.

6. A nozzle for casting or a plate for a sliding nozzle, wherein the refractory for casting according to claim 1 is arranged in part or all of the nozzle for casting or of the plate for a sliding nozzle.

7. The refractory for casting according to claim 2 , wherein the other refractory component in the balance is one or more of the following materials: MgO, SiO 2 , a tetragonal or a monoclinic ZrO 2 , SiC, B 4 C, BN, Si 3 N 4 , and a metal Si.

8. The refractory for casting according to claim 3 , wherein the other refractory component in the balance is one or more of the following materials: MgO, SiO 2 , a tetragonal or a monoclinic ZrO 2 , SiC, B 4 C, BN, S 3 N 4 , and a metal Si.

9. The refractory for casting according to claim 2 , wherein a metal Si is contained therein with a weight ratio of the metal Si to the Al component as a metal in the range of 0.1 to 2, both inclusive.

10. The refractory for casting according to claim 3 , wherein a metal Si is contained therein with a weight ratio of the metal Si to the Al component as a metal in the range of 0.1 to 2, both inclusive.

11. The refractory for casting according to claim 4 , wherein the metal Si is contained therein with a weight ratio of the metal Si to the Al component as a metal in the range of 0.1 to 2, both inclusive.

12. The refractory for casting according to claim 7 , wherein the metal Si is contained therein with a weight ratio of the metal Si to the Al component as a metal in the range of 0.1 to 2, both inclusive.

13. The refractory for casting according to claim 8 , wherein the metal Si is contained therein with a weight ratio of the metal Si to the Al component as a metal in the range of 0.1 to 2, both inclusive.

14. A nozzle for casting or a plate for a sliding nozzle, wherein the refractory for casting according to claim 2 is arranged in part or all of the nozzle for casting or of the plate for a sliding nozzle.

15. A nozzle for casting or a plate for a sliding nozzle, wherein the refractory for casting according to claim 3 is arranged in part or all of the nozzle for casting or of the plate for a sliding nozzle.

16. A nozzle for casting or a plate for a sliding nozzle, wherein the refractory for casting according to claim 4 is arranged in part or all of the nozzle for casting or of the plate for a sliding nozzle.

17. A nozzle for casting or a plate for a sliding nozzle, wherein the refractory for casting according to claim 5 is arranged in part or all of the nozzle for casting or of the plate for a sliding nozzle.

Assignees

• Krosakiharima Corp

Inventors

• Akamine Keiichiro
• Ito Kazuo
• Makino Taro

Classifications

• B22D41/32 Primary

  characterised by the materials used therefor · CPC title

• C04B2235/402

  Aluminium · CPC title

• C04B2235/422

  Carbon · CPC title

• F27D3/14

  Charging or discharging liquid or molten material · CPC title

• C04B2235/3895

  Non-oxides with a defined oxygen content, e.g. SiOC, TiON · CPC title