Manufacturing Method of Sintered Magnet, and Sintered Magnet
US-2020203068-A1 · Jun 25, 2020 · US
Method for producing sintered magnet and sintered magnet
US12119150B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12119150-B2 |
| Application number | US-202017288661-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 24, 2020 |
| Priority date | Sep 26, 2019 |
| Publication date | Oct 15, 2024 |
| Grant date | Oct 15, 2024 |
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Abstract
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A sintered magnet and a method for producing the same are provided. The method includes producing an R—Fe—B-based magnet powder by a reduction-diffusion method, adding a R—Al—Cu powder as a sintering agent to the R—Fe—B-based magnet powder to form a mixed powder, wherein the R—Al—Cu powder is an alloy of R, Al and Cu, and R is Nd, Pr, Dy, Tb or Ce, and sintering the mixed powder to form a sintered magnet.
First claim
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The invention claimed is: 1. A method for producing a sintered magnet, comprising: producing an R—Fe—B-based magnet powder by a reduction-diffusion method, adding a R—Al—Cu powder as a sintering agent to the R—Fe—B-based magnet powder to form a mixed powder, wherein the R—Al—Cu powder is an alloy of R, Al and Cu, and R is Nd, Pr, Dy, Tb or Ce, sintering the mixed powder to form a sintered magnet, and forming the R—Al—Cu powder as the sintering agent, wherein the forming the R—Al—Cu powder comprises: mixing RH 2 powder, Al powder, and Cu powder to form a sintered precursor, agglomerating the sintered precursor, raising a temperature of the agglomerated sintered precursor to form a metal alloy, and pulverizing the metal alloy to form the sintering agent. 2. The method according to claim 1 , further comprising wrapping the agglomerated sintered precursor in a metal foil when raising the temperature of the agglomerated sintered precursor. 3. The method according to claim 2 , wherein the metal foil is Mo or Ta. 4. The method according to claim 2 , wherein when wrapping the agglomerated sintered precursor in the metal foil and raising the temperature, the temperature is raised in an argon gas atmosphere. 5. The method according to claim 1 , wherein the forming the sintered precursor further comprises mixing a liquid Ga. 6. The method according to claim 1 , wherein the forming the metal alloy further comprises: wrapping the agglomerated sintered precursor in a metal foil, raising the temperature up to 900 degrees Celsius to 1050 degrees Celsius, and then performing an additional heat treatment. 7. The method according to claim 1 , wherein the agglomerating the sintered precursor uses any one of hydraulic pressing, tapping, or cold isostatic pressing (CIP). 8. The method according to claim 1 , further comprising: adding a NdH 2 powder to the R—Al—Cu powder as the sintering agent.
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Aspects linked to processes or compositions used in powder metallurgy · CPC title
Processes characterised by the sequence of their steps · CPC title
Rare Earth - Fe intermetallic alloys · CPC title
Argon · CPC title
Thermal after-treatment · CPC title
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- What does patent US12119150B2 cover?
- A sintered magnet and a method for producing the same are provided. The method includes producing an R—Fe—B-based magnet powder by a reduction-diffusion method, adding a R—Al—Cu powder as a sintering agent to the R—Fe—B-based magnet powder to form a mixed powder, wherein the R—Al—Cu powder is an alloy of R, Al and Cu, and R is Nd, Pr, Dy, Tb or Ce, and sintering the mixed powder to form a sinte…
- Who is the assignee on this patent?
- Lg Chemical Ltd
- What technology area does this patent fall under?
- Primary CPC classification B22F3/1003. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Oct 15 2024 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 5 related publications on this page (citations in our corpus or others sharing the same primary CPC).