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Magnetic powder and method for producing magnetic powder

A powder and magnetic technology, applied in the field of magnetic powder and its preparation, can solve the problem of difficult to maintain a single phase, difficult to obtain, difficult to obtain a single phase, and achieve the effect of preventing the decrease of saturation magnetization

Active Publication Date: 2020-06-26
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] However, when the SmFe-based 12 When using magnets, it is difficult not only to obtain a single phase, but also to obtain a powder whose particle size is controlled to a few microns
Also, when hydrogen is absorbed using a jet mill to make the particles smaller, phase separation occurs, and thus it is difficult to maintain a single phase

Method used

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  • Magnetic powder and method for producing magnetic powder
  • Magnetic powder and method for producing magnetic powder
  • Magnetic powder and method for producing magnetic powder

Examples

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preparation example Construction

[0052] A method for preparing a magnetic powder according to an embodiment of the present disclosure includes the steps of: preparing a mixture by mixing rare earth oxides, raw materials, metals, metal oxides, and a reducing agent; The mixture is heat-treated to synthesize a magnetic powder, wherein the raw material includes at least one of Fe and Co, the metal includes at least one of Ti, Zr, Mn, Mo, V, and Si, and the metal oxide includes MnO 2 、MoO 3 , V 2 o 5 , SiO 2 , ZrO 2 and TiO 2 At least one of them, and the magnetic powder have single-phase powder particles.

[0053] Reducing agents can include Ca, Mg, CaH 2 , at least one of Na and Na-K alloys. In particular, CaH 2 is preferred. Rare earth oxides may include neodymium oxide or samarium oxide.

[0054] The heat treatment may be performed in a tube furnace at a temperature of 800° C. to 1100° C. for 10 minutes to 6 hours under an inert atmosphere. The reduction and diffusion between the mixtures at a tempe...

Embodiment 1

[0062] Example 1: ZrO 2 、TiO 2 and the addition of Cu

[0063] By adding 8.500g Sm 2 o 3 , 23.957g Fe, 6.320g Co, 1.201g ZrO 2 , 3.893g TiO 2 , 0.309gCu and 12.004g CaH 2 (reducing agent) were uniformly mixed to prepare a mixture. The mixture was poured into SUS of any shape, and then reacted in a tube furnace at a temperature of 900° C. to 1050° C. for 1 hour to 3 hours under an inert gas (Ar, He) atmosphere. After the reaction was completed, it was pulverized using a mortar to prepare a magnetic powder, and then a washing process was performed to remove Ca and CaO as reduction by-products. Washing process in N 2 Performed under atmosphere to minimize exposure to air. In the 50g NH 4 NO 3 After being uniformly mixed with the synthesized magnetic powder, it was immersed in 400ml of methanol and homogenized once or twice using a homogenizer for effective washing. Thereafter, the magnetic powder and 200g ZrO 2 The balls were put together and dissolved with 0.5g NH 4 ...

Embodiment 2

[0064] Example 2: TiO 2 and addition of reducing agent Na-K alloy

[0065] 8.925g Sm 2 o 3 , 23.957g Fe, 6.320g Co, 3.893g TiO 2 and a reducing agent (10.477g Ca and 0.918g Na-K alloy) were uniformly mixed, and then a magnetic powder was synthesized by the method described in Example 1. After pulverizing the synthesized magnetic powder using a mortar, washing was performed by the method described in Example 1.

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Abstract

Magnetic powder according to an embodiment of the present invention is a powder particle obtained from the synthesis of a mixture of rare earth oxide, raw material, metal, metal oxide and reducing agent, wherein the powder particle is a single phase, the raw material comprises at least one of Fe and Co, the metal comprises at least one of Ti, Zr, Mn, Mo, V and Si, and the metal oxide comprises atleast one of MnO2,MoO3, V2O5, SiO2, ZrO2 and TiO2.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims Korean Patent Application No. 10-2018-0093981 filed with the Korean Intellectual Property Office on August 10, 2018 and Korean Patent Application No. 10-2019-0092709 filed with the Korean Intellectual Property Office on July 30, 2019 rights and interests, the disclosure of which is incorporated herein by reference in its entirety. [0003] The present disclosure relates to magnetic powders and methods for their preparation. More specifically, the present disclosure relates to having ThMn 12 A magnetic powder containing a rare earth element and a method for preparing the magnetic powder. Background technique [0004] as follows, with ThMn 12 Structure based on SmFe 12 magnets with existing Nd 2 Fe 14 The B structure has excellent magnetic properties compared to room temperature. [0005] Sm(Fe 0.8 co 0.2 ) 12 :μ 0 m s =1.78T,μ 0 h a =12T [0006] Nd 2 Fe 14 B:μ ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/053B22F1/00B22F9/20B22F1/105B22F1/142
CPCB22F9/20B22F2999/00B22F2998/10H01F1/0551B22F1/142B22F1/105C22C1/05B22F2201/10B22F9/04C22C2202/02B22F2202/11B22F2201/12H01F1/053B22F2304/10H01F1/0593
Inventor 催晋赫崔益赈鱼贤洙权纯在
Owner LG CHEM LTD
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