Ferrite particles for bonded magnets, resin composition for bonded magnets, and molded product using the same
US-2015041702-A1 · Feb 12, 2015 · US
Ferrite particles for bonded magnet, resin composition for bonded magnet and molded products using the same
US9607741B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9607741-B2 |
| Application number | US-201414256218-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 18, 2014 |
| Priority date | Mar 30, 2007 |
| Publication date | Mar 28, 2017 |
| Grant date | Mar 28, 2017 |
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Abstract
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The present invention relates to ferrite particles for bonded magnet, having a volume-average particle diameter of 2.1 to 2.7 μm and a particle diameter ×90 of 4.3 to 5.4 μm wherein the ×90 represents a particle diameter at which a cumulative percentage of particles under sieve (undersize particles) based on a volume thereof is 90%, when determined from a particle size distribution thereof measured by using a laser diffraction type particle size distribution measuring apparatus.
First claim
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What is claimed is: 1. A bonded magnet roll molded from Sr-based and/or Ba-based magnetoplumbite ferrite particles having a volume-average particle diameter of 2.1 to 2.7 μm and a particle diameter ×90 of 4.3 to 5.4 μm, wherein the ×90 represents a particle diameter at which a cumulative percentage of particles under sieve (undersize particles) based on a volume thereof is 90%, when determined from a particle size distribution thereof measured by using a laser diffraction type particle size distribution measuring apparatus, in an organic binder, wherein: the Sr-based magnetoplumbite ferrite particles consist of (i) Sr-based magnetoplumbite ferrite consisting of Sr, Fe and O, and (ii) at least one compound selected from the group consisting of Bi 2 O 3 and a residue obtained from calcination of at least one flux selected from the group consisting of SrCl 2 .2H 2 O, CaCl 2 .2H 2 O, MgCl 2 , KCl, NaCl Na 2 B 4 O 7 , and Bi 2 O 3 ; and the Ba-based magnetoplumbite ferrite particles consist of (i) Ba-based magnetoplumbite ferrite consisting of Ba, Fe, and O, and (ii) at least one compound selected from the group consisting of Bi 2 O 3 and a residue obtained from calcination of at least one flux selected from the group consisting of SrCl 2 .2H 2 O, CaCl 2 .2H 2 O, MgCl 2 , KCl, NaCl, Na 2 B 4 O 7 , and Bi 2 O 3 . 2. A bonded magnet roll molded from Sr-based and/or Ba-based magnetoplumbite ferrite particles having a volume-average particle diameter of 2.1 to 2.7 μm and a particle diameter ×90 of 4.3 to 5.4 μm, wherein the ×90 represents a particle diameter at which a cumulative percentage of particles under sieve (undersize particles) based on a volume thereof is 90%, when determined from a particle size distribution thereof measured by using a laser diffraction type particle size distribution measuring apparatus, in an organic binder, wherein: the Sr-based magnetoplumbite ferrite particles consist of (i) Sr-based magnetoplumbite ferrite consisting of Sr, Fe, and O; and the Ba-based magnetoplumbite ferrite particles consist of (i) Ba-based magnetoplumbite ferrite consisting of Ba, Fe and O.
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Classifications
Imparting anisotropy (methods and devices for magnetising permanent magnets H01F13/003) · CPC title
- H01F1/01Primary
of inorganic materials (H01F1/44 takes precedence) · CPC title
- C01G49/0036Primary
containing one alkaline earth metal, magnesium or lead · CPC title
Compounds of iron {(C09C1/0009, C09C1/0015, C09C1/0078 take precedence)} · CPC title
Magnetic properties · CPC title
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- What does patent US9607741B2 cover?
- The present invention relates to ferrite particles for bonded magnet, having a volume-average particle diameter of 2.1 to 2.7 μm and a particle diameter ×90 of 4.3 to 5.4 μm wherein the ×90 represents a particle diameter at which a cumulative percentage of particles under sieve (undersize particles) based on a volume thereof is 90%, when determined from a particle size distribution thereof meas…
- Who is the assignee on this patent?
- Toda Kogyo Corp
- What technology area does this patent fall under?
- Primary CPC classification H01F1/01. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Mar 28 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).