Methods for manufacturing magnetic composite structures with high mechanical strength

Patent metadata

Field	Value
Publication number	US-2016284469-A1
Application number	US-201615173707-A
Country	US
Kind code	A1
Filing date	Jun 5, 2016
Priority date	Aug 4, 2009
Publication date	Sep 29, 2016
Grant date	—

Abstract

Magnetic fiber structures include a fiber and a plurality of permanent magnet particles carried by the fiber.

First claim

1 - 15 . (canceled)

16 . A method of fabricating a magnetic composite structure, comprising:
providing a plurality of permanent magnet particles; providing a fiber; combining said permanent magnet particles with said fiber; providing a polymer matrix; and providing said fiber in said polymer matrix.

17 . The method of claim 16 further comprising winding said fiber.

18 . The method of claim 16 wherein said fiber comprises a fiber tube and said combining said permanent magnet particles with said fiber comprises placing said permanent magnet particles in said fiber tube.

19 . The method of claim 16 wherein said combining said permanent magnet particles with said fiber comprises pressing said permanent magnet particles onto an exterior surface of said fiber.

20 . The method of claim 16 wherein said providing a fiber comprises providing a multi-layered sheet, rolling said multi-layered sheet and forming said multi-layered sheet into an elongated fiber.

21 - 23 . (canceled)

24 . A method of fabricating a magnetic fiber structure, comprising:
providing an extruder apparatus comprising:
a triple nozzle having an exit and an outer nozzle, a middle nozzle and an inner nozzle communicating with said exit;
a first feed tank disposed in fluid communication with said middle nozzle;
a second feed tank disposed in fluid communication with said outer nozzle; and
forming an inner tube of said magnetic fiber structure by providing a first molten or softened material in said first feed tank and delivering said first molten or softened material through said middle nozzle and said exit;
forming an outer tube of said magnetic fiber structure by providing a second molten or softened material in said second feed tank and delivering said second molten or softened material through said outer nozzle and said exit; and
forming permanent magnetic particles in said inner tube by delivering magnetic particles through said inner nozzle and said exit.

25 . A method of fabricating a permanent magnetic structure, comprising:
providing an extruder apparatus comprising:
a furnace;
a forehearth communicating with said furnace;
a nozzle communicating with said forehearth;
an entrance for fiber material communicating with said furnace; and
an entrance for magnetic particles communicating with said forehearth; and
providing fiber material in said furnace and said forehearth through said entrance for fiber material; providing magnetic particles in said forehearth through said entrance for magnetic particles; and distributing said fiber material and said magnetic particles through said nozzle.

26 . The method of claim 25 further comprising providing electromagnets around said forehearth and exerting an electromagnetic field on said magnetic particles in said forehearth.

27 . A method of fabricating a permanent magnetic structure, comprising:
providing preform including fiber material slab; inserting magnetic particles into said preform; inserting said preform into an extruder; softening said fiber material slab; and extruding fiber from said fiber material slab.

28 . The method of claim 27 further comprising applying a magnetic field to magnetize said magnetic particles in the same direction.

Assignees

• Boeing Co

Inventors

• Hull John R
• Strasik Michael
• Wilenski Mark S

Classifications

• B29B11/10

  Extrusion moulding · CPC title

• B29K2995/0008

  Magnetic or paramagnetic · CPC title

• H01F41/0266 Primary

  Moulding; Pressing (H01F41/0273 takes precedence; hard magnetic particles H01F1/06, H01F1/11) · CPC title

• B29B11/16

  comprising fillers or reinforcement {(non-woven fabrics per se D04H1/00, D04H3/00)} · CPC title

• H01F1/083 Primary

  in a bonding agent · CPC title