Methods for making zirconium based alloys and bulk metallic glasses
Methods of preparing Zr based metallic using Zr sponge refined by a refining process are described. An exemplary method includes heating Zr sponge in a processing chamber with an electron-beam-heating apparatus or an arc-melting apparatus under a desired pressure condition to release volatile contaminants from the Zr sponge, introducing a purge gas into the processing chamber and permitting the purge gas to intermingle with at least some of the released volatile contaminants, evacuating the processing chamber to extract at least some of the purge gas and released volatile contaminants, repeating the heating of the Zr sponge, the introducing of the purge gas, and the evacuating of the processing chamber release and evacuate additional volatile contaminants from the Zr sponge to provide a processed Zr sponge with enhanced purity, and melting the processed Zr sponge with multiple other alloy constituents to provide a Zr-based metallic alloy.
1. A method of preparing a Zr-based metallic alloy, comprising:
heating Zr having a sponge structure under a vacuum condition in a processing chamber with an electron-beam-heating apparatus or an arc-melting apparatus to release volatile contaminants from the Zr;
introducing a purge gas into the processing chamber and permitting the purge gas to intermingle with at least some of the released volatile contaminants;
evacuating the processing chamber to extract at least some of the purge gas and released volatile contaminants;
additionally heating the Zr under an overpressure condition in the presence of an inert gas after said heating Zr having a sponge structure under a vacuum condition;
conducting another heating of the Zr to release additional volatile contaminants from the Zr, conducting another introduction of purge gas into the processing chamber, and conducting another evacuation of the processing chamber to provide processed Zr with enhanced purity; and
melting the processed Zr with multiple other alloy constituents to provide a Zr-based metallic alloy.
2. The method of claim 1 , wherein the Zr-based metallic alloy comprises Zr, Ti, Cu, Ni, and Be.
3. The method of claim 1 , wherein the Zr-based metallic alloy comprises Zr, Ti, Cu, Ni, and Al.
4. The method of claim 1 , wherein the Zr-based metallic alloy comprises Zr, Cu, Ni, Al, and Nb.
5. The method of claim 1 , comprising cooling the Zr-based metallic alloy so that it solidifies as a bulk metallic glass.
6. The method claim 1 , wherein the Zr-based metallic alloy is substantially amorphous in structure.
7. The method of claim 1 , wherein the volatile contaminants comprise Mg and Cl.
8. The method of claim 1 , comprising gettering oxygen in the processing chamber with a getter in the presence of the Zr.
9. The method of claim 8 wherein the getter comprises a Ti getter.
10. The method of claim 1 , wherein a mass of the Zr heated in a given heating operation is in the range of 5 kg to 50 kg.
11. The method of claim 1 , wherein the purge gas comprises an inert gas.
12. The method of claim 1 , wherein the vacuum condition is provided with the addition of an inert gas into the processing chamber.
13. The method of claim 1 , wherein the heating of the Zr comprises melting the Zr.
14. A method of preparing a Zr-based metallic alloy, comprising:
heating Zr having a sponge structure under a vacuum condition in a processing chamber to release contaminants from the Zr;
purging at least some of the released contaminants from the processing chamber with a purge gas;
evacuating the processing chamber after said purging;
additionally heating the Zr under an overpressure condition in the presence of an inert gas after said heating Zr having a sponge structure under a vacuum condition;
further heating the Zr to release additional contaminants from the Zr, and further purging the processing chamber after said further heating to provide processed Zr with enhanced purity; and
melting the processed Zr with multiple other alloy constituents to provide a Zr-based metallic alloy.
15. The method of claim 14 , wherein the Zr-based metallic alloy comprises Zr, Ti, Cu, Ni, and Be.
16. The method of claim 14 , wherein the Zr-based metallic alloy comprises Zr, Ti, Cu, Ni, and Al.
17. The method of claim 14 , wherein the Zr-based metallic alloy comprises Zr, Cu, Ni, Al, and Nb.
18. The method of claim 14 , comprising cooling the Zr-based metallic alloy so that it solidifies as a bulk metallic glass.
19. The method of claim 14 , wherein the Zr-based metallic alloy is substantially amorphous in structure.
20. The method of claim 14 , comprising gettering oxygen with a getter in the processing chamber in the presence of the Zr.
21. The method of claim 14 , wherein a mass of the Zr heated in a given heating operation is in the range of 5 kg to 50 kg.
22. The method of claim 14 , wherein the heating of the Zr comprises melting the Zr.
23. The method of claim 14 , wherein the vacuum condition is provided with the addition of an inert gas into the processing chamber.