Co-extrusion printing of filaments for superconducting wire
View Patent ↗A method of manufacturing a superconducting tape includes forming a slurry of superconducting material, forming a slurry of sacrificial material, extruding the slurries of superconducting and sacrificial materials as interdigitated stripes onto a substrate, and removing the sacrificial material to form superconducting filaments.
1. A method of manufacturing a superconducting metal tape, comprising:
synthesizing a superconducting material external to a print head;
forming a slurry of the superconducting material;
forming a slurry of sacrificial material;
depositing the slurries of superconducting material and the sacrificial material as one flow of multiple interdigitated stripes of each material onto a metal substrate using the print head, wherein the slurry of superconducting material and the slurry of sacrificial material are formulated so the slurries avoid mixing when the slurries come into contact;
sintering the slurries; and
removing the sacrificial material to form superconducting filaments.
2. The method of claim 1 , wherein forming the slurry of superconducting material comprises mixing a powder of the superconducting material into an organic solvent with a binder.
3. The method of claim 2 , wherein mixing the powder into an organic solvent comprises mixing magnesium diboride powder into butyl carbitol.
4. The method of claim 2 , wherein mixing the powder into an organic solvent comprises mixing magnesium diboride powder and chemical dopants into butyl carbitol.
5. The method of claim 1 , wherein forming a second slurry of sacrificial material comprises mixing a binder into a solvent.
6. The method of claim 5 , wherein mixing a binder into a solvent comprises dissolving a cellulose binder into an organic solvent.
7. The method of claim 1 , further comprising forming the metal tape into a rotor for a synchronous machine.
8. The method of claim 1 , wherein sintering the slurries also removes the sacrificial material and comprises heating the substrate and slurries to a temperature in the range of 700−800° C.
9. The method of claim 1 , further comprising sintering the slurry of superconducting material separately from removing the sacrificial material.
10. The method of claim 1 , further comprising coating the substrate with a buffer layer prior to depositing the slurries.
11. The method of claim 1 , further comprising coating the stripes of superconducting material with a top layer.
12. The method of claim 1 , wherein forming the slurry of superconducting material comprises forming the slurry of superconducting material including dopants selected to enhance the flux pinning of the superconducting material.
13. A method of manufacturing a superconducting metal tape, comprising:
forming a slurry of a first material;
forming a slurry of a second material;
forming a slurry of sacrificial material;
depositing the slurries of the first material, the second material, and the sacrificial material, as one flow of multiple interdigitated stripes of each material onto a substrate, wherein the slurries of the first material and the second material are formulated to allow them to react and form a superconducting compound after depositing; and
removing the sacrificial material to form superconducting filaments.
14. A method of manufacturing a superconducting metal tape, comprising:
forming a slurry of a first material by mixing powders of two different materials;
forming the slurry of a sacrificial material;
depositing the slurries of the first material and the sacrificial material, as one flow of multiple interdigitated stripes of each material onto a substrate; and
sintering at least the slurry of the first material, wherein the slurry of the first material is formulated to allow the powders to form a superconducting compound during sintering.