Michael B Field

US Patent:

6410487, Jun 25, 2002

Filed:

Jul 20, 2000

Appl. No.:

09/619934

Inventors:

Dean J. Miller - Darien IL
Michael B. Field - Jersey City NJ

Assignee:

The University of Chicago - Chicago IL

International Classification:

H01B 1202

US Classification:

505239, 505471, 505450

Abstract:

A bulk superconductor having a thickness of not less than about 100 microns is carried by a polycrystalline textured substrate having misorientation angles at the surface thereof not greater than about 15Â; the bulk superconductor may have a thickness of not less than about 100 microns and a surface area of not less than about 50 cm. The textured substrate may have a thickness not less than about 10 microns and misorientation angles at the surface thereof not greater than about 15Â. Also disclosed is a process of manufacturing the bulk superconductor and the polycrystalline biaxially textured substrate material.

US Patent:

6981309, Jan 3, 2006

Filed:

Oct 13, 2004

Appl. No.:

10/963972

Inventors:

Seung Hong - New Providence NJ, US
Jeff Parrell - Roselle Park NJ, US
Michael Field - Jersey City NJ, US

Assignee:

Oxford Superconducting Technology - Carteret NJ

International Classification:

H01L 39/24

US Classification:

29599, 29825, 1741251, 505928, 505930

Abstract:

An improvement is disclosed in the method for producing a multifilament (Nb, Ti)Sn superconducting wire by the steps of preparing a plurality of Nb or Nb alloy rods where Nb or Nb alloy monofilaments are encased in copper or copper alloy sheaths; packing the Nb or Nb alloy rods within a copper containing matrix to form a packed subelement for the superconducting wire; providing sources of Sn, and sources of Ti within said subelement; assembling the subelements within a further copper containing matrix; and diffusing the Sn and Ti into the Nb or Nb alloy rods to form (Nb, Ti)Sn. The method is improved by diffusing the Ti into the Nb from a minor number of Ti dopant source rods which are distributed among the Nb or Nb alloy rods.

US Patent:

7216418, May 15, 2007

Filed:

Oct 22, 2004

Appl. No.:

10/971722

Inventors:

Seung Hong - New Providence NJ, US
Jeff Parrell - Roselle Park NJ, US
Youzhu Zhang - East Brunswick NJ, US
Michael Field - Jersey City NJ, US

Assignee:

Oxford Superconducting Technology - Carteret NJ

International Classification:

H01L 39/24

US Classification:

29599, 29825, 1741251, 505928, 505930

Abstract:

A method for decreasing the effective magnetic filament sizes for high current internal tin NbSn superconductors. During processing composite rods preferably comprised of copper clad Ta rods of approximately the same dimensions as the hexes in the designed filament billet stack are used as dividers in the subelement. Along with the Ta rods, Ta strips are strategically situated against the Nb or Nb alloy barrier tube which surrounds the subelement. The use of Ta as a spacer instead of copper prevents any reasonable likelihood of bridging of the superconducting phases formed after final reaction.

US Patent:

7368021, May 6, 2008

Filed:

Feb 22, 2005

Appl. No.:

11/063334

Inventors:

Michael Field - Jersey City NJ, US
Jeff Parrell - Roselle Park NJ, US
Youzhu Zhang - East Brunswick NJ, US
Seungok Hong - New Providence NJ, US

Assignee:

Oxford Superconducting Technology - Carteret NJ

International Classification:

H01L 39/24

US Classification:

148 98, 29599, 29825, 1741251

Abstract:

Critical current densities of internal tin wire to the range of 3000 A/mmat temperature of 4. 2 K and in magnetic field 12 T are achieved by controlling the following parameters in a distributed barrier subelement design: wt % Sn in bronze; atomic Nb:Sn; local area ratio; reactable barrier; barrier thickness relative to the filament thickness; additions of a dopant such as Ti or Ta to the NbSn; and the design for restacking and wire reduction to control the maximum filament diameter at the subsequent heat reaction stage.

US Patent:

7562433, Jul 21, 2009

Filed:

Sep 26, 2005

Appl. No.:

11/235705

Inventors:

Seung Hong - New Providence NJ, US
William G. Marancik - Ebony VA, US
Jeff Parrell - Roselle Park NJ, US
Michael Field - Jersey City NJ, US
Kenneth Marken - Cranford NJ, US
Youzhu Zhang - East Brunswick NJ, US

Assignee:

Oxford Superconducting Technology - Carteret NJ

International Classification:

H01L 39/24
B23P 17/00

US Classification:

29599, 294191, 29424, 505230, 505430, 505434, 977762, 977840, 977888

Abstract:

A method for fabrication of nanometer scale metal fibers, followed by optional further processing into cables, yarns and textiles composed of the primary nanofibers. A multicomponent composite is first formed by drilling a billet of matrix metal, and inserting rods of the metal desired as nanofibers. Hexed or round rods can also be inserted into a matrix metal can. The diameter of this composite is then reduced by mechanical deformation methods. This composite is then cut to shorter lengths and reinserted into another billet of matrix metal, and again the diameter is reduced by mechanical deformation. This process of large scale metal stacking followed by mechanical deformation is repeated until the desired fiber size scale is reached, the fibers being contained in the matrix metal. After size reduction, the composite metal wires may be further processed into built up configurations, depending on intended application, by stranding, cabling, braiding, weaving, knitting, felting, etc. , to form yarns or textiles.

US Patent:

7585377, Sep 8, 2009

Filed:

Mar 4, 2008

Appl. No.:

12/074714

Inventors:

Michael Field - Jersey City NJ, US
Jeff Parrell - Roselle Park NJ, US
Youzhu Zhang - East Brunswick NJ, US
Seungok Hong - New Providence NJ, US

Assignee:

Oxford Superconducting Technology - Carteret NJ

International Classification:

H01L 39/04

US Classification:

148 98, 29599, 29825, 1741251

Abstract:

Critical current densities of internal tin wire having values of at least 2000 A/mmat temperature of 4. 2 K and in magnetic field of 12 T are achieved by controlling the following parameters in a distributed barrier subelement design: wt % Sn in bronze; atomic Nb:Sn; local area ratio; reactable barrier; and barrier thickness relative to the filament thickness; and the design for restacking and wire reduction to control the maximum filament diameter at the subsequent heat reaction stage.

US Patent:

8522420, Sep 3, 2013

Filed:

Jun 26, 2008

Appl. No.:

12/215384

Inventors:

Seung Hong - New Providence NJ, US
Hanping Maio - Edison NJ, US
Huang Yibing - Edison NJ, US
Maarten Meinesz - Parlin NJ, US
Michael Field - Jersey City NJ, US

Assignee:

Oxford Superconducting Technology, Inc. - Carteret NJ

International Classification:

H01F 41/04
H01B 12/06

US Classification:

29599, 1741251, 505470

Abstract:

A method for successfully heat treating magnet coils of braided BiSrCaCuO(Bi-2212) strand. The Bi-2212 coil is fabricated using standard round wire powder-in-tube techniques, and braided with a ceramic-glass braid with integrated carbonaceous binder. The coil is heated in an atmosphere controlled furnace below the high current density phase reaction sequence to burn off the carbonaceous binder and evacuated to remove unwanted gases from the inner windings. The oxygen environment is then reintroduced and the coil is heat treated to the high Jreaction temperature and then processed as normal. As the local atmosphere around the surface of the wire, particularly the concentration of oxygen, is critical to a successful reaction sequence, high current Bi-2212 coils can thereby be obtained.

US Patent:

20080163474, Jul 10, 2008

Filed:

Jan 9, 2007

Appl. No.:

11/651443

Inventors:

Seung Hong - New Providence NJ, US
Maarten Meinesz - Parlin NJ, US
Youzhu Zhang - East Brunswick NJ, US
Jeff Parrell - Roselle Park NJ, US
Michael Field - Jersey City NJ, US

International Classification:

H01L 39/24

US Classification:

29599, 505431, 29858

Abstract:

A method for the fabrication of an insulated solder bonded multifilamentary superconducting wire composite. An uninsulated wire composite is prepared by using a high melting point solder to join a multifilamentary superconducting composite to a solderable metallic component. A polymer insulation film coating is then applied on top of the wire composite, and the resulting assembly is subjected to heating in a furnace at furnace temperatures and for a period sufficient to cure the insulation but insufficient to melt the solder.