Y-type hexaferrite, method of manufacture, and uses thereof

Patent metadata

Field	Value
Publication number	US-2023399237-A1
Application number	US-202318205007-A
Country	US
Kind code	A1
Filing date	Jun 2, 2023
Priority date	Jun 8, 2022
Publication date	Dec 14, 2023
Grant date	—

Abstract

In an aspect, a Co 2 Y-type ferrite includes oxides of at least Ba, La, Co, Me, Fe, and optionally Ca; wherein Me is at least Ni and optionally one or more of Zn, Cu, Mn, or Mg. A composite can include the Co 2 Y-type ferrite and a polymer. An article can include the Co 2 Y-type ferrite.

First claim

What is claimed is:

1 . A Co 2 Y-type ferrite, comprising:
oxides of at least Ba, La, Co, Me, Fe, and optionally Ca; wherein Me is at least Ni and optionally one or more of Zn, Cu, Mn, or Mg.

2 . The Co 2 Y-type ferrite of claim 1 , wherein the Co 2 Y-type ferrite has a formula Ba 1-x La x Ca n Co 2-y-z Me y Fe 12-m O 22 , wherein x is 0.01 to 0.5, or 0.1 to 0.5; y is 0.01 to 1.5, or 0.1 to 1, or 0.2 to 0.5; z is −0.5 to 0.5, or −0.2 to 0; and m is −2 to 2, or 0.1 to 0.5; n is 0 to 0.5; or to 0.5.

3 . The Co 2 Y-type ferrite of claim 2 , wherein the Co 2 Y-type ferrite has a formula Ba 1-x La x Ca n Co 2-y-z Ni y Fe 12-m O 22 .

4 . The Co 2 Y-type ferrite of claim 1 , wherein the Co 2 Y-type ferrite has a D 50 particle size of 2 to 10 micrometers.

5 . The Co 2 Y-type ferrite of claim 1 , wherein the Co 2 Y-type ferrite has a porosity of 0 to 50 volume percent based on the total volume of the Co 2 Y-type ferrite.

6 . The Co 2 Y-type ferrite of claim 1 , wherein the Co 2 Y-type ferrite has a permeability greater than or equal to 3 over the frequency range of 1 to 2 GHz.

7 . The Co 2 Y-type ferrite of claim 1 , wherein the Co 2 Y-type ferrite has a magnetic loss of less than or equal to 0.75 over the frequency range of 1 to 2 GHz.

8 . The Co 2 Y-type ferrite of claim 1 , wherein the Co 2 Y-type ferrite has a permittivity of less than or equal to 9 over the frequency range of 1 to 2 GHz.

9 . The Co 2 Y-type ferrite of claim 1 , wherein the Co 2 Y-type ferrite has a dielectric loss of less than or equal to 0.01 over the frequency range of 1 to 2 GHz.

10 . A composite comprising a polymer and the Co 2 Y-type ferrite of claim 1 .

11 . The composite of claim 10 , wherein the polymer comprises at least one of a paraffin wax, polytetrafluoroethylene, a polyethylene, a polypropylene, polyolefin, a polyurethane, a silicone polymer, a liquid crystalline polymer, poly(ether ether ketone), or poly(phenylene sulfide).

12 . The composite of claim 10 , wherein the polymer comprises polytetrafluoroethylene or poly(phenylene sulfide).

13 . The composite of claim 10 , wherein the composite has at least one of
a permeability of greater than or equal to 1.5 over the frequency range of 1 to 2 GHz; a specific magnetic loss of less than or equal to 0.03 over the frequency range of 1 to 2 GHz; a permittivity of less than or equal to 6.5 over the frequency range of 1 to 2 GHz; or a dielectric loss of less than or equal to 0.008 over the frequency range of 1 to 2 GHz.

14 . The composite of claim 10 , wherein the composite comprises 5 to 95 volume percent of the Co 2 Y-type ferrite based on the total volume of the composite.

15 . A composite of claim 10 , wherein the composite has a porosity of 0 to 45 volume percent based on the total volume of the composite.

16 . An article comprising the ferrite composition of claim 1 .

17 . The article of claim 16 , wherein the article is an antenna.

18 . A method of making a Co 2 Y-type ferrite comprising:
milling ferrite precursor compounds comprising oxides of at least Ba, La, Co, Me, and Fe, wherein Me includes Ni and optionally another divalent element to form a magnetic oxide mixture; and calcining the magnetic oxide mixture in an oxygen or air atmosphere to form the Co 2 Y-type ferrite.

19 . The method of claim 18 , wherein the calcining the mixed ferrite occurs at a calcining temperature of 800 to 1,300° C. or for a calcining time of 0.5 to 20 hours.

20 . The method of claim 18 , further comprising forming a composite comprising the Co 2 Y-type ferrite and a polymer.

Assignees

• Rogers Corp

Inventors

• Chen Yajie
• Young Lance
• Horn Iii Allen F
• Blasius William
• Brock Lori

Classifications

• C08K2003/2265

  of iron · CPC title

• C01P2006/42

  Magnetic properties · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• C01G49/0054 Primary

  containing one rare earth metal, yttrium or scandium · CPC title

• C08K3/22

  of metals · CPC title