Method for deoxidizing Al—Nb—Ti alloy

Patent metadata

Field	Value
Publication number	US-11319614-B2
Application number	US-201515522062-A
Country	US
Kind code	B2
Filing date	Nov 4, 2015
Priority date	Nov 4, 2014
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

Disclosed herein is a method for deoxidizing an Al—Nb—Ti alloy, which includes melting and holding an Al—Nb—Ti alloy containing from 50 to 75 mass % of Al, from 5 to 30 mass % of Nb, and 80 mass % or less in total of Al and Nb by a melting method using a water-cooled copper vessel in an atmosphere of 1.33 Pa to 2.67×105 Pa at a temperature of 1,900 K or more, thereby decreasing an oxygen content thereof. The Al—Nb—Ti alloy is prepared using an alloy material formed of an aluminum material, a niobium material and a titanium material and containing oxygen in a total amount of 0.5 mass % or more.

First claim

The invention claimed is:

1. A method for deoxidizing an Al—Nb—Ti alloy, the method comprising:
melting and holding the Al—Nb—Ti alloy by a melting method using a water-cooled copper vessel in an atmosphere of 1.33 Pa to 2.67×10 5 Pa at a temperature of 1,900 K or more, thereby decreasing an oxygen content thereof to 0.1 mass % or less,
wherein the Al—Nb—Ti alloy is prepared from materials comprising an aluminum material, a niobium material and a metallic titanium material, and the Al—Nb—Ti alloy comprises from 50 to 75 mass % of Al, from 5 to 30 mass % of Nb, 80 mass % or less in total of Al and Nb, and 2.5 mass % to 30 mass % of oxygen, the remainder being titanium and impurities.

2. The method according to claim 1 , wherein a flux of CaO alone or a CaO—CaF 2 flux obtained by blending more than 0 mass % and 95 mass % or less of calcium fluoride with calcium oxide is added during the melting of the Al—Nb—Ti alloy.

3. The method according to claim 1 , wherein the melting method is an arc melting method, a plasma arc melting method or an induction melting method.

4. The method according to claim 2 , wherein the melting method is an arc melting method, a plasma arc melting method or an induction melting method.

5. The method according to claim 1 , wherein the Al—Nb—Ti alloy comprises from 60 to 75 mass % of Al.

6. The method according to claim 1 , wherein the melting and holding are performed such that a difference of an amount of Al in the Al—Nb—Ti alloy before and after the melting and holding is 1.0 mass % or less.

7. The method according to claim 1 , wherein the melting and holding are performed such that the oxygen content of the Al—Nb—Ti alloy after the melting and holding is 0.076 mass % or less.

8. The method according to claim 1 , wherein the melting and holding are performed such that a difference of an amount of Al in the Al—Nb—Ti alloy before and after the melting and holding is 1.0 mass % or less and that the oxygen content of the Al—Nb—Ti alloy after the melting and holding is 0.076 mass % or less.

9. The method according to claim 1 , wherein the alloy material contains oxygen in the total amount of 7.3 mass % or more.

10. The method according to claim 1 , wherein the niobium material is lower niobium or niobium oxide ore.

11. The method according to claim 1 , wherein the melting and holding process is performed at 1.20×10 5 Pa to 2.67×10 5 Pa.

12. The method according to claim 1 , wherein the titanium material is free of titanium oxide.

13. The method according to claim 2 , wherein the melting and holding are performed such that the oxygen content of the Al—Nb—Ti alloy after the melting and holding is 0.036 mass % or less.

Assignees

• Kobe Steel Ltd

Inventors

• MATSUWAKA Daisuke
• Kudo Fumiaki
• Deura Tetsushi
• Ishida Hitoshi
• Sakamoto Koichi

Classifications

• C22C21/00

  Alloys based on aluminium · CPC title

• C22B9/10

  with refining or fluxing agents; Use of materials therefor, {e.g. slagging or scorifying agents}(C22B9/18 takes precedence){(C22B9/006 takes precedence)} · CPC title

• C22C1/02 Primary

  by melting {(C22C1/1036 takes precedence)} · CPC title

• C22C1/026 Primary

  Alloys based on aluminium · CPC title

• C22B9/20

  Arc remelting · CPC title