Method for producing Ti—Ai alloy

Patent metadata

Field	Value
Publication number	US-12152288-B2
Application number	US-202117758948-A
Country	US
Kind code	B2
Filing date	Feb 3, 2021
Priority date	Feb 3, 2020
Publication date	Nov 26, 2024
Grant date	Nov 26, 2024

Abstract

Production methods for Ti—Al alloys may include: adding a flux including calcium oxide containing 35+wt. % calcium fluoride, to a melt starting material of Ti material and Al material and with 50+wt. % Al; introducing the fluxed melt starting material into a water-cooled copper crucible having a tapping port in the bottom, induction melting it inside the water-cooled copper crucible in at least a 1.33 Pa atmosphere; the flux, containing oxygen released from the melt starting material by the induction melting, is separated out by tapping the melt starting material, which was induction melted in the water-cooled copper crucible, downward from the tapping port; and when obtaining the Ti—Al alloy by casting the flux-removed melt starting material, the induction melting output is reduced to no more than 90% of that during melting and tapping is performed from the water-cooled crucible with the output in a reduced state.

First claim

The invention claimed is:

1. A method for producing a Ti—Al alloy, the method comprising:
adding a flux, comprising calcium oxide and 35 wt. % or more of calcium fluoride, to a melting raw material comprising a titanium material and an aluminum material and having a blending amount of Al of 50 wt. % or more, to obtain an added melting raw material;
adding the melting raw material to a water-cooled copper crucible with a discharging hole formed at a bottom portion;
induction-melting the added melting raw material in the water-cooled copper crucible under an atmosphere of 1.33 Pa or more, to obtain an induction melted raw material;
discharging the induction melted melting raw material downward from the discharging hole to separate the flux comprising oxygen liberated from the melting raw material by the induction-melting, to obtain a separated melting raw material and
casting the separated melting raw material to obtain the Ti—Al alloy,
wherein, before the casting, an output of the induction-melting is reduced to be 90% or less of an output at melting, and
wherein the separated melting raw material is discharged from the water-cooled copper crucible in a state where the output has been reduced.

2. The method of claim 1 , wherein the casting comprises obtaining a mixture by adding titanium for dilution to the separated melting raw material discharged downward to a crucible for casting and performing the casting.

3. The method of claim 1 , wherein the melting raw material is composed of the titanium material and the aluminum material and has the blending amount of 50 wt. % or more Al.

4. A method for producing a Ti—Al alloy, the method comprising:
adding a melting raw material, comprising a titanium material and an aluminum material and having a blending amount of 50 wt. % Al or more, to a water-cooled copper crucible with a discharging hole formed at a bottom portion, to obtain an added melting raw material;
induction-melting the added melting raw material in the water-cooled copper crucible under an atmosphere of 1.33 Pa or more, to obtain an induction-melted raw material;
discharging the induction-melted raw material downward from the discharging hole to separate a deoxidation product liberated from the melting raw material by the induction-melting, to obtain an separated melting raw material; and
casting the separated melting raw material to obtain the Ti—Al alloy,
wherein, before the casting, an output of the induction-melting is reduced to be 90% or less of an output at melting, and
wherein the separated melting raw material is discharged from the water-cooled copper crucible in a state where the output has been reduced.

5. The method of claim 4 , wherein the casting comprises obtaining a mixture by adding titanium for dilution to the separated melting raw material discharged downward to a crucible for casting and performing the casting.

6. The method of claim 4 , wherein the melting raw material is composed of the titanium material and the aluminum material and has the blending amount of 50 wt. % or more Al.

Assignees

• Kobe Steel Ltd

Inventors

• MATSUWAKA Daisuke
• O Shorin

Classifications

• C22C14/00

  Alloys based on titanium · CPC title

• B22D21/007

  with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C · CPC title

• Y02P10/25

  Process efficiency · CPC title

• B22D21/04

  Casting aluminium or magnesium {(no material; see B22D21/007)} · CPC title

• C22B34/12

  Obtaining titanium {or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08} · CPC title