Preparation of alloys by the Armstrong method
View Patent ↗A method and apparatus for making alloys or ceramics by the subsurface injection of an equilibrium vapor of a boiling liquid of the ceramic or alloys constituents is disclosed. Various powders and products are disclosed.
1. A method of producing an alloy or ceramic by the exothermic subsurface reduction of a mixed halide vapor of the alloy or ceramic constituents with liquid alkali or alkaline earth reductant metal or mixtures thereof, comprising providing a liquid mixture of halides of the alloy or ceramic constituents in a preselected atomic ratio, boiling the liquid mixture of halides until an equilibrium with the vapor is attained, and thereafter introducing the equilibrium vapor into the liquid reductant metal to form an alloy or ceramic powder of the equilibrium vapor constituents in the preselected atomic ratio.
2. The method of claim 1 , wherein the reductant metal is Na or Mg.
3. The method of claim 2 , wherein the halide is a chloride.
4. The method of claim 3 , wherein the alloy is principally Ti.
5. The method of claim 4 , wherein the alloy is principally Ti and includes Al and V.
6. The method of claim 5 , wherein the alloy is substantially 6% Al and 4% V with the remainder substantially Ti.
7. The method of claim 1 , wherein the reductant metal is present in excess of the stoichiometric amount.
8. The method of claim 7 , wherein the reductant metal is present in the range of from about 20 to about 50 times the stoichiometric amount.
9. The method of claim 7 , wherein the reductant metal is present as a flowing stream.
10. The method of claim 1 , wherein the vapor is introduced into the liquid metal by subsurface injection at greater than sonic velocity.
11. The method of claim 1 , wherein the ceramic is one or more of a nitride or a carbide or a boride or a mixture thereof.
12. The method of claim 1 , wherein the alloy includes one or more of Ti, Al, Sb, Be, B, Ta, Zr, V, Nb, Mo, Ga, U, Re, or Si.
13. The method of claim 12 , wherein the alloy includes one or more of Ti, Al, Ta, Zr, V, Nb, Mo, Ga, Re, or Si.
14. The method of claim 1 , wherein at least some of the liquid halides are under pressure prior to forming the liquid mixture of halides.
15. A method of producing an alloy by the exothermic subsurface reduction of a mixed halide vapor of the alloy constituents with liquid alkali or alkaline earth reductant metal or mixtures thereof, comprising providing a liquid mixture of halides of the alloy constituents in a preselected atomic ratio, boiling the liquid mixture of halides until an equilibrium with the vapor is attained, and thereafter injecting the equilibrium vapor into the liquid reductant metal at greater than sonic velocity to form an alloy powder of the equilibrium vapor constituents in the preselected atomic ratio.
16. The method of claim 15 , wherein the reductant metal is Na or Mg.
17. The method of claim 16 , wherein the halide is a chloride.
18. The method of claim 17 , wherein the alloy is principally Ti.
19. The method of claim 18 , wherein the alloy is principally Ti and includes Al and V.
20. The method of claim 19 , wherein the alloy is substantially 6% Al and 4% V with the remainder substantially Ti.
21. The method of claim 20 , wherein the reductant metal is present in excess of the stoichiometric amount.
22. The method of claim 21 , wherein the reductant metal is present in the range of from about 20 to about 50 times the stoichiometric amount.
23. The method of claim 22 , wherein the reductant metal is present as a flowing stream.
24. The method of claim 15 , wherein the reductant metal is Na and the halide is a chloride and the alloy includes one or more of Ti, Al, Sb, Be, B, Ta, Zr, V, Nb, Mo, Ga, U, Re, or Si.
25. The method of claim 24 , wherein the alloy includes one or more of Ti, Al, Ta, Zr, V, Nb, Mo, Ga, Re, or Si.
26. The method of claim 15 , wherein one or more of the liquid halides is maintained under pressure.