Composite magnetic sealing material

Patent metadata

Field	Value
Publication number	US-9818518-B2
Application number	US-201615351701-A
Country	US
Kind code	B2
Filing date	Nov 15, 2016
Priority date	Mar 31, 2016
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

Disclosed herein is a composite magnetic sealing material includes a resin material and a filler blended in the resin material in a blended ratio of 30 vol. % or more to 85 vol. % or less. The filler includes a magnetic filler containing Fe and 32 wt. % or more and 39 wt. % or less of a metal material contained mainly of Ni, thereby a thermal expansion coefficient of the composite magnetic sealing material is 15 ppm/° C. or less.

First claim

What is claimed is:

1. A composite magnetic sealing material comprising:
a resin material; and
a filler blended in the resin material in a blended ratio of 30 vol. % or more to 85 vol. % or less,
wherein the filler includes a magnetic filler containing Fe and 32 wt. % or more and 39 wt. % or less of a metal material composed mainly of Ni, thereby a thermal expansion coefficient of the composite magnetic sealing material is 15 ppm/° C. or less.

2. The composite magnetic sealing material as claimed in claim 1 , wherein the metal material further contains 0.1 wt. % or more and 8 wt. % or less of Co relative to a total weight of the magnetic filler.

3. The composite magnetic sealing material as claimed in claim 1 , wherein the filler further includes a non-magnetic filler.

4. The composite magnetic sealing material as claimed in claim 3 , wherein a ratio of an amount of the non-magnetic filler relative to a sum of an amounts of the magnetic filler and the non-magnetic filler is 1 vol. % or more and 40 vol. % or less.

5. The composite magnetic sealing material as claimed in claim 4 , wherein the non-magnetic filler contains at least one material selected from a group consisting of SiO 2 , ZrW 2 O 8 , (ZrO) 2 P 2 O 7 , KZr 2 (PO 4 ) 3 , or Zr 2 (WO 4 )(PO 4 ) 2 .

6. The composite magnetic sealing material as claimed in claim 1 , wherein the magnetic filler has a substantially spherical shape.

7. The composite magnetic sealing material as claimed in claim 1 , wherein the magnetic filler is coated with an insulating material.

8. The composite magnetic sealing material as claimed in claim 7 , wherein a film thickness of the insulating material is 10 nm or more.

9. The composite magnetic sealing material as claimed in claim 1 , wherein the resin material comprises a thermosetting resin material.

10. The composite magnetic sealing material as claimed in claim 9 , wherein the thermosetting resin material contains at least one material selected from a group consisting of an epoxy resin, a phenol resin, a urethane resin, a silicone resin, or an imide resin.

11. The composite magnetic sealing material as claimed in claim 1 , wherein a volume resistivity of the composite magnetic sealing material is 10 10 Ωcm or more.

12. A composite magnetic sealing material comprising:
a resin material;
a magnetic filler formed of an Fe—Ni based material blended in the resin material, the magnetic filler containing Fe and 32 wt. % or more and 39 wt. % or less of a metal material composed mainly of Ni; and
a non-magnetic filler blended in the resin material,
wherein a ratio of an amount of the non-magnetic filler relative to a sum of an amounts of the magnetic filler and the non-magnetic filler is 1 vol. % or more and 40 vol. % or less, and
wherein a thermal expansion coefficient of the composite magnetic sealing material is 15 ppm/° C. or less.

13. The composite magnetic sealing material as claimed in claim 12 , wherein the magnetic filler is coated with an insulating material having a film thickness is 10 nm or more.

14. The composite magnetic sealing material as claimed in claim 12 , wherein the non-magnetic filler contains at least one material selected from a group consisting of SiO 2 , ZrW 2 O 8 , (ZrO) 2 P 2 O 7 , KZr 2 (PO 4 ) 3 , or Zr 2 (WO 4 )(PO 4 ) 2 .

Assignees

• Tdk Corp

Inventors

• Kawabata Kenichi

Classifications

• H10W42/284

  shielding resins · CPC title

• H10W42/287

  materials for magnetic shielding, e.g. ferromagnetic materials · CPC title

• H10W42/276

  the arrangements being on an external surface of the package, e.g. on the outer surface of an encapsulation · CPC title

• H10W74/114

  by a substrate and the encapsulations · CPC title

• H10W74/473

  containing a filler · CPC title