Processes for producing tantalum alloys and niobium alloys

Patent metadata

Field	Value
Publication number	US-9994929-B2
Application number	US-201615043751-A
Country	US
Kind code	B2
Filing date	Feb 15, 2016
Priority date	Mar 15, 2013
Publication date	Jun 12, 2018
Grant date	Jun 12, 2018

Abstract

Processes for the production of tantalum alloys and niobium are disclosed. The processes use aluminothermic reactions to reduce tantalum pentoxide to tantalum metal or niobium pentoxide to niobium metal.

First claim

What is claimed is:

1. A process for the production of a tantalum alloy comprising:
conducting aluminothermic reactions using a reactant mixture comprising:
tantalum pentoxide powder;
at least one of iron (III) oxide powder and copper (II) oxide powder;
barium peroxide powder; and
aluminum metal powder.

2. The process of claim 1 , wherein the reactant mixture further comprises at least one of niobium pentoxide powder, tungsten trioxide powder, molybdenum trioxide powder, chromium (III) oxide powder, hafnium dioxide powder, zirconium dioxide powder, titanium dioxide powder, vanadium pentoxide powder, and tungsten metal powder.

3. The process of claim 1 , wherein the reactant mixture further comprises at least one of niobium pentoxide powder, tungsten trioxide powder, molybdenum trioxide powder, and tungsten metal powder.

4. The process of claim 1 , wherein the reactant mixture further comprises niobium pentoxide powder.

5. The process of claim 1 , wherein the reactant mixture further comprises tungsten trioxide powder and/or tungsten metal powder.

6. The process of claim 1 , wherein the reactant mixture further comprises molybdenum trioxide powder.

7. The process of claim 1 , wherein the aluminothermic reactions produce a tantalum alloy regulus and a separate slag phase.

8. The process of claim 7 , further comprising electron beam melting the tantalum alloy regulus and producing a tantalum alloy ingot.

9. The process of claim 8 , wherein the tantalum alloy ingot comprises:
at least one of niobium, tungsten, and molybdenum; and
balance tantalum and incidental impurities.

10. The process of claim 1 , wherein conducting the aluminothermic reactions comprises:
positioning the reactant mixture in a reaction vessel comprising a magnesium oxide layer located on a bottom surface of the reaction vessel; and
initiating the aluminothermic reactions.

11. A process for the production of a tantalum alloy or a niobium alloy comprising:
conducting aluminothermic reactions using a reactant mixture comprising:
tantalum pentoxide powder and/or niobium pentoxide powder;
iron (III) oxide powder and/or copper (II) oxide powder;
barium peroxide powder;
aluminum metal powder; and
at least one of tungsten trioxide powder, molybdenum trioxide powder, chromium (III) oxide powder, hafnium dioxide powder, zirconium dioxide powder, titanium dioxide powder, vanadium pentoxide powder, and tungsten metal powder.

12. The process of claim 11 , wherein the reactant mixture comprises:
tantalum pentoxide powder;
molybdenum trioxide powder;
iron (III) oxide powder and/or copper (II) oxide powder;
barium peroxide powder; and
aluminum metal powder.

13. The process of claim 11 , wherein the reactant mixture comprises:
niobium pentoxide powder;
iron (III) oxide powder and/or copper (II) oxide powder;
barium peroxide powder;
aluminum metal powder; and
at least one of tungsten trioxide powder, molybdenum trioxide powder, chromium (III) oxide powder, hafnium dioxide powder, zirconium dioxide powder, titanium dioxide powder, vanadium pentoxide powder, and tungsten metal powder.

14. The process of claim 13 , wherein the reactant mixture comprises:
niobium pentoxide powder;
molybdenum trioxide powder;
iron (III) oxide powder and/or copper (II) oxide powder;
barium peroxide powder; and
aluminum metal powder.

15. The process of claim 13 , wherein the reactant mixture comprises:
niobium pentoxide powder;
titanium dioxide powder;
iron (III) oxide powder and/or copper (II) oxide powder;
barium peroxide powder; and
aluminum metal powder.

16. The process of claim 13 , wherein the reactant mixture comprises:
niobium pentoxide powder;
zirconium dioxide powder;
iron (III) oxide powder and/or copper (II) oxide powder;
barium peroxide powder; and
aluminum metal powder.

17. The process of claim 13 , wherein the aluminothermic reactions produce a niobium alloy regulus and a separate slag phase.

18. The process of claim 17 , further comprising electron beam melting the niobium alloy regulus and producing a niobium alloy ingot.

19. The process of claim 18 , wherein the niobium alloy ingot comprises:
at least one of tungsten, molybdenum, hafnium, zirconium, titanium, and vanadium; and
balance niobium and incidental impurities.

20. The process of claim 18 , wherein the niobium alloy ingot comprises:
at least one of molybdenum, zirconium, and titanium; and
balance niobium and incidental impurities.

21. A process for the production of a niobium alloy comprising:
conducting aluminothermic reactions using a reactant mixture comprising:
niobium pentoxide powder;
iron (III) oxide powder and/or copper (II) oxide powder;
barium peroxide powder;
aluminum metal powder; and
at least one of tantalum pentoxide powder, tungsten trioxide powder, molybdenum trioxide powder, chromium (III) oxide powder, hafnium dioxide powder, zirconium dioxide powder, titanium dioxide powder, vanadium pentoxide powder, and tungsten metal powder.

22. The process of claim 21 , wherein the reactant mixture comprises:
niobium pentoxide powder;
tantalum pentoxide powder;
iron (III) oxide powder and/or copper (II) oxide powder;
barium peroxide powder; and
aluminum metal powder.

23. The process of claim 21 , wherein the aluminothermic reactions produce a niobium alloy regulus and a separate slag phase, wherein the process further comprises electron beam melting the niobium alloy regulus and producing a niobium alloy ingot, and wherein the niobium alloy ingot comprises:
at least one of tantalum, molybdenum, zirconium, and titanium; and
balance niobium and incidental impurities.

Assignees

• Ati Properties Llc

Inventors

• Fajardo Arnel M
• Foltz Iv John W

Classifications

• C22C1/045

  Alloys based on refractory metals · CPC title

• C22B34/24 Primary

  Obtaining niobium or tantalum · CPC title

• C22B9/228

  by particle radiation, e.g. electron beams · CPC title

• C22B5/04

  by aluminium, other metals or silicon · CPC title

• B22F2999/00

  Aspects linked to processes or compositions used in powder metallurgy · CPC title