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A kind of lanthanum-cerium co-doped isotropic bonded magnetic powder and preparation method thereof

An isotropic, magnetic powder technology, used in magnetic objects, magnetic materials, electrical components, etc., can solve problems such as consumption, soaring prices, and resource shortages, and achieve uniform morphology distribution, production cost reduction, and grain refinement. Effect

Active Publication Date: 2021-11-05
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Nd-Fe-B based permanent magnet materials have been widely used in automobiles, electronic information, wind power and other fields due to their excellent performance since they were discovered in the 1980s, but at the same time they also consume a large amount of Pr, Medium-heavy rare earths such as Nd, Tb, and Dy lead to shortage of resources and soaring prices

Method used

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  • A kind of lanthanum-cerium co-doped isotropic bonded magnetic powder and preparation method thereof
  • A kind of lanthanum-cerium co-doped isotropic bonded magnetic powder and preparation method thereof
  • A kind of lanthanum-cerium co-doped isotropic bonded magnetic powder and preparation method thereof

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preparation example Construction

[0054] Another aspect of the present invention also provides a method for preparing isotropic bonded magnetic powder co-doped with lanthanum and cerium, comprising the following steps:

[0055] (1) Weigh the raw material according to the composition in the magnetic powder and place it in the furnace to smelt it into a clarified alloy liquid, and cool it into an alloy ingot;

[0056] (2) Place the alloy ingot smelted in step (1) into an induction quick quenching furnace after being broken, and the quick quenching furnace is evacuated and filled with argon to a positive pressure, and the broken alloy is placed in the quick quenching furnace The crucible is melted to boiling to form alloy liquid, and then flows from the gate to the edge of the rotating roller, and the alloy liquid is rapidly cooled and solidified into a thin strip under the cooling action of the roller;

[0057] (3) heat-treating the rapidly quenched ribbon obtained in step (2) and quenching, and breaking the rib...

Embodiment 1

[0092] The permanent magnetic material prepared by the present embodiment has the following alloy composition: [Nd 0.5 (La 0.6 Ce 0.4 ) 0.5 ] 11.9 Fe 81.1 m 1 B 6 , M is Al and / or Nb, and the contents of the above-mentioned elements are in atomic percent. Specific steps are as follows:

[0093] (1) a master alloy equipped with the above-mentioned composition, wherein the raw materials La, Ce, and Nd are all added in the form of pure metal, and the phase form of B is respectively a BFe alloy containing 20 atomic percent of B and 80 atomic percent of Fe, The amount of remaining Fe is formulated as pure metal. Then adopt the following process steps to manufacture NdFeB rare earth permanent magnet materials.

[0094] (2) Put the raw material in a vacuum induction furnace to melt into a clarified alloy liquid, turn off the current and rapidly cool it under circulating cold water at 20°C to form an alloy ingot.

[0095] (3) Place the above-mentioned smelted alloy ingot in ...

Embodiment 2

[0102] The permanent magnetic material prepared by the present embodiment has the following alloy composition: [Nd 0.6 (La 0.8 Ce 0.2 ) 0.4 ] 11.9 Fe 81.1 m 1 B 6 , M is Al and / or Nb, and the contents of the above-mentioned elements are in atomic percent. Specific steps are as follows:

[0103] (1) a master alloy equipped with the above-mentioned composition, wherein the raw materials La, Ce, and Nd are all added in the form of pure metal, and the phase form of B is respectively a BFe alloy containing 20 atomic percent of B and 80 atomic percent of Fe, The amount of remaining Fe is formulated as pure metal. Then adopt the following process steps to manufacture NdFeB rare earth permanent magnet materials.

[0104] (2) Melt the raw materials in a vacuum induction furnace to form a clarified alloy solution, then turn off the current and rapidly cool it under circulating cold water at 23°C to form an alloy ingot.

[0105] (3) Place the above-mentioned smelted alloy ingot...

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Abstract

A lanthanum-cerium co-doped neodymium-iron-boron isotropic bonded magnetic powder and a preparation method thereof, the chemical formula of the magnetic powder is expressed as: [RE 1‑x (LR) x ] a Fe 100‑a‑b‑c m b B c , where 0.05≤x≤0.7, 11≤a≤13, 0≤b≤1.55, 5.5≤c≤6.2, RE is Nd or a combination of Nd and any one or several rare earth elements except La and Ce, LR Represents rare earth elements La and Ce, M is Al and / or Nb. Wherein, the grain size of the magnetic powder is 20-70nm. The present invention uses relatively surplus and cheap rare earth lanthanum and cerium to partially replace the neodymium element in NdFeB, and controls the ratio of lanthanum and cerium and the ratio of lanthanum and cerium to neodymium, and adds an appropriate amount of Nb and / or Al elements to suppress α-Fe The precipitation can reduce the irreversible loss of magnetic flux and increase the coercive force. By combining the rapid quenching process and parameter control, while saving costs, it can also maintain good magnetic properties and make comprehensive and balanced utilization of rare earth elements.

Description

technical field [0001] The invention relates to the technical processing field of permanent magnet materials, in particular to an isotropic bonded magnetic powder co-doped with lanthanum and cerium and a preparation method thereof. Background technique [0002] Since the discovery of Nd-Fe-B-based permanent magnet materials in the 1980s, they have been widely used in automobiles, electronic information, wind power and other fields due to their excellent performance, but at the same time they also consume a large amount of Pr, Medium and heavy rare earths such as Nd, Tb, and Dy lead to shortage of resources and soaring prices. Since rare earth ores are associated ores, Pr, Nd, Tb, and Dy are consumed in large quantities, and high-abundance rare earths La and Ce are seriously backlogged. Therefore, in recent years, high-abundance rare earths La and Ce have been applied to permanent magnet materials to balance rare earth resources. The utilization and reduction of production c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/06C22C38/12C22C38/00B22F1/00B22F9/04H01F1/057
CPCB22F1/0003B22F9/04B22F2009/048C22C38/005C22C38/06C22C38/12C22C38/32H01F1/0571
Inventor 罗阳林笑于敦波杨远飞权宁涛谢佳君李天昊彭海军
Owner GRIREM ADVANCED MATERIALS CO LTD
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