Magnetic grain boundary engineered ferrite core materials

• US 9,117,565 B2
• Filed: 05/08/2012
• Issued: 08/25/2015
• Est. Priority Date: 05/09/2011
• Status: Active Grant

• Current Assignee: Metamagnetics, Inc.
• Original Assignee: Metamagnetics, Inc.
• Inventors: Chen, Yajie, Harris, Vincent G.
• Primary Examiner(s): Koslow, Carol M
• Application Number:
  US13/466,751
• Publication Number:
  US 20120286920A1
• Time in Patent Office: 1,204 Days
• Field of Search: 252/62, 252/56, 252/62.62
• US Class Current: 1/1
• CPC Class Codes: H01B 3/10 metallic oxides ceramics H01B3/12
• CPC Class Codes: H01F 1/344 Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4
• CPC Class Codes: H01F 1/36 in the form of particles H01F1/346, H01F1/348 and H01F1/38 take precedence
• CPC Class Codes: H01F 3/08 made from powder powder coatings on sheets H01F3/02; on strips or ribbons H01F3/04; on wires H01F3/06

Abstract

A composite material can include a grain component and a nanostructured grain boundary component. The nanostructured grain boundary component can be insulating and magnetic, so as to provide greater continuity of magnetization of the composite material. The grain component can have an average grain size of about 0.5-50 micrometers. The grain boundary component can have an average grain size of about 1-100 nanometers. The nanostructured magnetic grain boundary material has a magnetic flux density of at least about 250 mT. The grain component can comprise MnZn ferrite particles. The nanostructured grain boundary component can comprise NiZn ferrite nanoparticles. Core components and systems thereof can be manufactured from the composite material.

Claims

1. A composite material, comprising:

a grain component having a magnetic ferrite phase; and

a nanostructured magnetic grain boundary component that is both magnetic and insulating;

wherein the nanostructured magnetic grain boundary component has a composition that derives from a mixture of powder particles and has a magnetic flux density of greater than about 250 mT.

2. The composite material of claim 1, wherein the nanostructured magnetic grain boundary component has an electrical resistivity of about 10⁸ to 10¹² Ω

-cm.

3. The composite material of claim 1, wherein the mixture of powder particles comprises NiZn ferrite nanoparticles comprising a magnetic and insulating ferrite consisting principally of the elements Ni, Zn, Fe, and O.

4. The composite material of claim 1, wherein the grain component comprises a MnZn ferrite material.

7. The compound material of claim 1, wherein the nanostructured magnetic grain boundary component can have an average size of about 1-100 nm.

8. The composite material of claim 1, wherein the mixed powder comprises a first particulate component and a second particulate component, and wherein the ratio of the second particulate component to the first particulate component can be controlled to between about 1 and 20 weight percent.

5. A method comprising:

producing a composite material by sintering a mixed powder comprising a first particulate component and a second particulate component, the second particulate component comprising particles that are nanosized, magnetic and insulating,

wherein a composition of the second particulate component is disposed at grain boundaries of grains comprising a composition of the first component, thereby forming a nanostructured magnetic grain boundary component.

6. The method of claim 5, wherein, in the mixed powder comprising a first particulate component and a second particulate component, the first particulate component can have a particle size of about 0.5-50 microns.

13. The method of claim 5, wherein, in the mixed powder comprising a first particulate component and a second particulate component, the second particulate component can have a particle size of about 1-100 nm.

14. The method of claim 5, wherein in the mixed powder comprising a first particulate component and a second particulate component, the second particulate component comprises NiZn ferrite nanoparticles.

15. The method of claim 5, wherein in the mixed powder comprising a first particulate component and a second particulate component, the first particulate component comprises MnZn ferrite particles.

16. The method of claim 5, further comprising producing the mixed powder, wherein in the mixed powder the first particulate component and the second particulate component have particle sizes obtained via a particle separation technique.

17. The method of claim 5,

further comprising adding a binder to the mixture prior to sintering.

18. The method of claim 17, further comprising forming the mixed powder and eliminating the binder by heating.

19. The method of claim 5, wherein prior to sintering, the mixed powder is shaped as a core component selected from the group consisting of a ferrite toroid, a ferrite plate, a ferrite disk, a ferrite E-core, a ferrite EI-core, a ferrite C core, a ferrite CI core, a planar E core, an EC core, a EFD core, a EP core, a ETD core, an ER core, a planar ER core, a U core, a RM/I core, a RM/LP core, a P/I core, a PT core, a PTS core, a PM core, a PQ core, a gaped toroid, and a bobbin core.

20. The method of claim 5, further comprising disposing the composite material in an apparatus selected from the group consisting of a transformer, an electronic device, an inductor, a power electronic device, a power converter, an inductor device, a transmit and receive module (TRM), an Electronically Scanned Phased Arrays (ESPA) system, an Electronic Warfare (EW) system, and a communication device having a SMPS conditioning component.

21. The method of claim 5, wherein, in the mixed powder comprising a first particulate component and a second particulate component, the ratio of the second particulate component to the first particulate component can be controlled within about 1 weight percent.

9. A core component comprising a composite material, wherein the composite material comprises:

a grain component having a magnetic ferrite phase; and

a nanostructured magnetic grain boundary component that is both magnetic and insulating;

wherein the nanostructured magnetic grain boundary component has a composition that derives from a mixture of powder particles and has a magnetic flux density of about 250 mT or greater.

10. The core component of claim 9, wherein the core component is selected from the group consisting of a ferrite toroid, a ferrite plate, a ferrite disk, a ferrite C core, a ferrite CI core, a planar E core, an EC core, a EFD core, a EP core, a ETD core, an ER core, a planar ER core, a U core, a RM/I core, a RM/LP core, a P/I core, a PT core, a PTS core, a PM core, a PQ core, a gaped toroid, a bobbin core, a ferrite E-core, and a ferrite EI-core.

11. The core component of claim 9, wherein the nanostructured magnetic grain boundary component can have an average size of about 1-100 nm.

12. The core component of claim 9, the mixed powder comprises a first particulate component and a second particulate component, and wherein the ratio of the second particulate component to the first particulate component can be controlled to between about 1 and 20 weight percent.