Compression-bonded magnet with case and method for producing the same
US-2018040405-A1 · Feb 8, 2018 · US
Rare earth bonded magnet
US10629342B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10629342-B2 |
| Application number | US-201715414461-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 24, 2017 |
| Priority date | Jan 25, 2016 |
| Publication date | Apr 21, 2020 |
| Grant date | Apr 21, 2020 |
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- Title
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Abstract
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A rare earth bonded magnet comprises a rare earth-iron-based magnetic powder and a thermosetting resin composition. The thermosetting resin composition is obtained by blending a dicyclopentadiene type epoxy resin as a base resin and dicyandiamide as a curing agent. The dicyclopentadiene type epoxy resin includes a predetermined structure wherein an average value of a repeating unit n is 1 to 3.
First claim
Opening claim text (preview).
What is claimed is: 1. A rare-earth bonded magnet comprising: A rare-earth-iron-based magnetic powder comprising neodymium, iron and boron as main components; and a thermosetting resin, the thermosetting resin composition being obtained by blending a dicyclopentadiene type epoxy resin as a base resin and dicyandiamide as a curing agent, the dicyclopentadiene type epoxy resin including a structure represented by the following formula (1) where the average value of a repeating unit n is 1 to 3, wherein 70% or more of the dicyclopentadiene type epoxy resin blended in the thermosetting resin is the dicyclopentadiene type epoxy resin of the structure where the respecting unit n is 1, wherein thermal demagnetization rate after 1000 h heat exposure at 180° C. is 10% to about 12%, the rare earth bonded magnet comprises 1 to 3 mass % of the thermosetting resin, and a Tg (glass transition temperature) of the dicyclopentadiene type epoxy resin after reacted to the curing agent is about 160° C. 2. The rare earth bonded magnet according to claim 1 , wherein radial crushing strength is 50 MPa or higher.
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Classifications
containing rare earths, i.e. Sc, Y, Lanthanides · CPC title
containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60 · CPC title
- H01F1/0578Primary
bonded together · CPC title
pressed, sintered, or bound together · CPC title
Lubricant mixed with the metal powder · CPC title
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Frequently asked questions
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- What does patent US10629342B2 cover?
- A rare earth bonded magnet comprises a rare earth-iron-based magnetic powder and a thermosetting resin composition. The thermosetting resin composition is obtained by blending a dicyclopentadiene type epoxy resin as a base resin and dicyandiamide as a curing agent. The dicyclopentadiene type epoxy resin includes a predetermined structure wherein an average value of a repeating unit n is 1 to 3.
- Who is the assignee on this patent?
- Minebea Mitsumi Inc
- What technology area does this patent fall under?
- Primary CPC classification H01F1/0578. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Apr 21 2020 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 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).