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Titanium master alloy for titanium-aluminum based alloys

a technology of titanium and alloys, applied in the direction of electrolysis processes, cells, electrolysis components, etc., can solve the problems of limited use of titanium and its alloys, the inability to remove al theoretically by electro-refining, and the cost of titanium alloys several times higher than the original cost of titanium

Inactive Publication Date: 2018-07-19
UNIVERSAL ACHEMETAL TITANIUM LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes methods for producing titanium-aluminum alloys without the need for additional alloying steps, reducing production costs. The methods also prevent electrical shorting between the anode and cathode and produce lightweight, powdery or crystalline alloys with different textures depending on the temperature and composition of the electrolyte. The methods can use a variety of titanium bearing ores and require fewer processing steps.

Problems solved by technology

However, the use of titanium and its alloys is limited due to high cost associated with their production.
Therefore, the cost of titanium alloys is several times higher than the original cost of titanium.
Because the electrical ionization potential of Al is in between the potentials of Mn and V, it is clear that Al also theoretically cannot be removed by electro-refining.
Moreover, literature teaches that the presence of a substantial amount of oxygen in the precursor material prevents the effective separation of Al from titanium.
Therefore, the use of these titanium chlorides adds more cost to the refining process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0074]Titanium-aluminide used in this example was produced by melting appropriate amounts of titanium and aluminum to produce Ti-36% Al alloy. Oxygen content of this alloy was 0.2%. The alloy was cut into small pieces and 29.0 g of this material was electro-refined at a constant DC current of 1.0 A. The refining process was carried out in NaCl-KCl (44:56 wt. %) electrolyte at 750° C. Nine grams (9.0 g) of cathode deposit was harvested and contained 33wt. % Al.

example 2

[0075]Titanium-aluminide used in this example was produced by melting appropriate amounts of titanium and aluminum to produce a Ti-10% Al alloy. Oxygen content of this alloy was 0.2%. The alloy was cut into small pieces and 31.0 g of this material was electro-refined at a constant DC current of 1.0 A. The refining process was carried out in NaCl-KCl (44:56 wt. %) electrolyte at 750° C. 14.0 g of cathode deposit was harvested and contained 7.0% Al.

example 3

[0076]Titanium-aluminide used in this example was produced by aluminothermic reduction of TiO2 with Al to produce a Ti-13% A1-11% O alloy. The alloy was broken into small pieces and 31.0 g of this material was electro-refined at a constant DC current of 1.0 A. The refining process was carried out in NaCl-KCl (44:56 wt. %) electrolyte at 750° C. 18.0 g of cathode deposit was harvested and contained 2.5% Al.

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PUM

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Abstract

A process is disclosed for the electro-refinement of titanium aluminides to produce titanium-aluminum master alloys which process is effective even in the presence of substantial amounts of aluminum and in the presence of ten (10) or more weight percent oxygen in the material(s) to be refined. The process is likewise effective without the addition of titanium chlorides or other forms of soluble titanium to the electrolyte bath comprising halide salts of alkali metals or alkali-earth metals or a combination thereof.

Description

RELATED APPLICATIONS[0001]This application claims the benefit, and priority benefit, of U.S. Provisional Patent Application Ser. No. 62 / 446,205, filed Jan. 13, 2017, the disclosure and contents of which are incorporated by reference herein in its entirety.BACKGROUND OF THE DISCLOSURE1. Field of the Invention[0002]The present disclosure relates to a method to produce titanium master alloy for titanium-aluminum based metal alloys. The titanium-aluminum based alloys can have a composition of Ti-(1-10)wt. % Al-X (where X=V, Sn, Fe, Nb, Mo, etc.). More particularly the disclosure is directed towards various methods to electro-refine titanium aluminides for the production of titanium-(1-10)wt. % aluminum master alloy.2. Description of the Related Art[0003]Superior structural properties such as corrosion resistance, light weight and high-melting point, make titanium and its alloys the material of choice for many engineering applications.[0004]However, the use of titanium and its alloys is ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C25C3/36C22C14/00C25C5/04C25C3/28C25C3/12C25C7/06
CPCC25C3/36C22C14/00C25C5/04C25C3/28C25C3/12C25C7/06C25C7/007
Inventor COX, JAMES R.DEALWIS, CHANAKA L.KOHLER, BENJAMIN A.LEWIS, MICHAEL G.KLUCK, JULIANE B.
Owner UNIVERSAL ACHEMETAL TITANIUM LLC