Apparatus and method for production of high purify copper-based alloys
In an aspect, a method of manufacturing a high purity copper-based alloy comprises providing in a melting furnace a feedstock and melting the feedstock. The method additionally includes bubbling an inert gas into the molten copper-based alloy to form the high purity copper-based alloy. Aspects are also directed to an apparatus and a method of fabricating an apparatus for manufacturing the high purity copper-based alloy.
1. An apparatus for manufacturing a copper-based alloy, the apparatus comprising:
a melting furnace configured to form a molten copper-based alloy comprising at least 50 weight % copper; and
a diffusive lining formed on an inner surface of the melting furnace and comprising an aluminum-silicate ceramic having a porous structure adapted for bubbling an inert gas through the molten copper-based alloy.
2. The apparatus according to claim 1 , further comprising an inert gas source connected to the diffusive lining for supplying the inert gas.
3. The apparatus according to claim 1 , wherein the diffusive lining substantially covers at least a bottom inner surface of the melting furnace.
4. The apparatus according to claim 1 , wherein the diffusive lining comprises at least two layers comprising a sintered ceramic layer and an unsintered ceramic layer.
5. The apparatus according to claim 4 , wherein the sintered ceramic layer comprises mullite.
6. The apparatus according to claim 5 , wherein the unsintered ceramic layer comprises alumina and silica.
7. The apparatus according to claim 6 , wherein the sintered ceramic layer is configured to contact the molten copper-based alloy.
8. The apparatus according to claim 6 , wherein the sintered ceramic layer and the unsintered ceramic layer have substantially a same chemical composition while having different phases.
9. The apparatus according to claim 6 , wherein the unsintered ceramic layer comprises 60-70 mol % alumina and 20-25 mol % silica.
10. The apparatus according to claim 6 , wherein the unsintered ceramic layer comprises a compacted powder having an average particle size less than 63 μm.
11. An apparatus for manufacturing a copper-based alloy, the apparatus comprising:
a melting furnace configured to form a molten copper-based alloy comprising at least 50 weight % copper; and
a diffusive lining substantially covering a bottom inner surface of the melting furnace and having a porous structure adapted for bubbling an inert gas into the molten copper-based alloy.
12. The apparatus according to claim 11 , further comprising an inert gas source connected to the diffusive lining for supplying the inert gas.
13. The apparatus according to claim 12 , wherein the inert gas consists essentially of argon.
14. The apparatus according to claim 12 , wherein the inert gas is hydrogen-free.
15. The apparatus according to claim 12 , further comprising a diffuser embedded within the diffusive lining, the diffuser comprising a diffuser material disposed within a container connected to the inert gas source and having an upper surface disposed below an upper surface of the diffusive lining covering the bottom inner surface of the melting furnace.
16. The apparatus according to claim 15 , wherein the diffuser and the diffusive lining comprise a same diffuser material.
17. The apparatus according to claim 11 , wherein the diffusive lining further covers a sidewall inner surface of the melting furnace.
18. The apparatus according to claim 11 , wherein the diffusive lining comprises at least two layers comprising a sintered ceramic layer and an unsintered ceramic layer.
19. The apparatus according to claim 18 , wherein the unsintered ceramic layer comprises alumina and silica.
20. The apparatus according to claim 11 , wherein the sintered ceramic layer comprises mullite.
21. An apparatus for manufacturing a copper-based alloy, the apparatus comprising:
a melting furnace configured to form a molten copper-based alloy comprising at least 50 weight % copper; and
a diffusive lining having a porous structure in the melting furnace,
wherein the diffusive lining is formed on at least two different inner surfaces of the melting furnace such that the diffusive lining is adapted for bubbling an inert gas into the molten copper-based alloy from the at least two different inner surfaces.
22. The apparatus according to claim 21 , wherein the at least two different inner surfaces comprise a bottom inner surface and a sidewall inner surface of the melting furnace.
23. The apparatus according to claim 22 , further comprising an inert gas source connected to the diffusive lining for supplying the inert gas.
24. The apparatus according to claim 23 , further comprising a diffuser centrally disposed within the diffusive lining on a bottom inner surface of the melting furnace, the diffuser comprising a diffuser material disposed within a container connected to the inert gas source and having an upper surface disposed below an upper surface of the diffusive lining covering the bottom inner surface.
25. The apparatus according to claim 24 , wherein the inert gas is configured to diffuse through the diffuser, followed by a diffusive lining on the bottom inner surface, followed by the diffusive lining on the sidewall inner surface.
26. The apparatus according to claim 25 , wherein one or both of the diffuser and the diffusive lining have a porosity greater than 20%.
27. The apparatus according to claim 23 , wherein the melting furnace is configured to melt the copper-based alloy under an open chamber configuration in which an atmosphere above the molten copper-based alloy is exposed to an outside atmosphere.
28. The apparatus according to claim 23 , wherein the melting furnace is an induction furnace comprising an induction coil surrounding the melting furnace and configured to melt the copper-based alloy.
29. The apparatus according to claim 28 , wherein the induction furnace is configured to operate at a frequency less than 1000 Hz.
30. The apparatus according to claim 28 , wherein a topmost winding of the induction coil is disposed below a melt line of the molten copper-based alloy.