# US 2017/0283906 A1 · METHOD FOR DEOXIDIZING Ti-Al ALLOY

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- Number: US 2017/0283906 A1
- Document ID: US20170283906A1
- Status: Published application
- Kind: A1
- Application number: 15/508,384
- Filed: 2015-09-02
- Published: 2017-10-05
- Earliest claimed: 2014-09-04
- Assignees: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
- Applicants: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
- Inventors: Fumiaki KUDO; Daisuke MATSUWAKA; Tetsushi DEURA; Koichi SAKAMOTO; Daiki TAKAHASHI; Hitoshi ISHIDA
- Web page: https://patentgrep.com/patent/US20170283906A1

## CPC

- C22B 9/20: Arc remelting
- C22B 9/003: {by induction}
- C22B 9/04: Refining by applying a vacuum
- C22B 9/10: with refining or fluxing agents; Use of materials therefor, {e.g. slagging or scorifying agents}(C22B9/18 takes precedence){(C22B9/006 takes precedence)}
- C22C 1/02: by melting {(C22C1/1036 takes precedence)}
- C22C 14/00: Alloys based on titanium
- C22C 21/00: Alloys based on aluminium
- C22B: PRODUCTION AND REFINING OF METALS (electrolytic C25); PRETREATMENT OF RAW MATERIALS
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

A method for deoxidizing a Ti—Al alloy includes melting and holding a Ti—Al alloy containing 40 mass % or more of Al by a melting method using a water-cooled copper vessel in an atmosphere of 1.33 Pa or more, thereby decreasing an oxygen content in the Ti—Al alloy. The Ti—Al alloy is manufactured using an alloy material composed of a titanium material and an aluminum material. The alloy material contains oxygen in a total amount of 0.1 mass % or more.

## Claims

### Claim 1

A method for deoxidizing a Ti—Al alloy, the method comprising
melting and holding a Ti—Al alloy containing 40 mass % or more of Al and 0.1 mass % or more of oxygen by a melting method using a water-cooled copper vessel in an atmosphere of 1.33 Pa or more, thereby decreasing an oxygen content in the Ti—Al alloy.

### Claim 2 (depends on 1)

The method according to claim 1, wherein a CaO—CaF2 flux prepared by blending from 35 to 95 mass % of calcium fluoride with calcium oxide is added before or during the melting of the Ti—Al alloy.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the melting method using the water-cooled copper vessel is any one of an arc melting method, a plasma arc melting method, and an induction melting method.

### Claim 4 (depends on 2)

The method for deoxidizing a Ti—Al alloy according to claim 2, wherein the melting method using the water-cooled copper vessel is any one of an arc melting method, a plasma arc melting method, and an induction melting method.