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Method for manufacturing La-and-Ce-contained neodymium iron boron rare earth permanent magnet

A technology of rare earth permanent magnets and manufacturing methods, which is applied in the direction of inductance/transformer/magnet manufacturing, magnetic objects, magnetic materials, etc., can solve the problems of rare earth shortage, rare earth price rising and then rising, and heavy rare earth element shortage, etc., to improve the resistance Oxidation ability, reduced dosage, and improved magnetic properties

Active Publication Date: 2014-08-20
SHENYANG GENERAL MAGNETIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] With the wide application of NdFeB rare earth permanent magnets, rare earths are becoming more and more scarce, especially heavy rare earth elements are obviously becoming scarce, and the price of rare earths has risen again and again; for this reason, people have carried out many explorations, and double alloys have appeared. technology, metal infiltration technology, improvement or reorganization of grain boundary phase technology, etc.; patent CN101521069B discloses the technology of doping heavy rare earth hydride nanoparticles to prepare NdFeB. powder, and then mix the heavy rare earth hydride nanoparticles produced by physical vapor deposition technology with the aforementioned powder, and then manufacture NdFeB magnets through conventional processes such as magnetic field molding and sintering, although the patent finds ways to improve the coercive force of magnets method, mass production has problems

Method used

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  • Method for manufacturing La-and-Ce-contained neodymium iron boron rare earth permanent magnet

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Select LR-Fe-B-Ma alloy and HR-Fe-B-Mb alloy 600Kg to smelt respectively according to the composition of Example 1 in Table 1, and cast the alloy on a rotating copper roll with water cooling in the molten state to cool to form an alloy sheet. During the smelting process, the cooling rate of the LR-Fe-B-Ma alloy and the HR-Fe-B-Mb alloy was adjusted by adjusting the rotation speed of the rotating copper roller, and the average grain size of the LR-Fe-B-Ma alloy was 2.8 μm ; The average grain size of the HR-Fe-B-Mb alloy is 1.8 μm; select the LR-Fe-B-Ma alloy and HR-Fe-B-Mb alloy sheets according to the ratio listed in Table 1 for hydrogen crushing, hydrogen crushing The final alloy flakes and the metal oxides listed in Table 1 are put into the mixer together according to the ratio of Table 1, and mixed under the protection of nitrogen. The mixing time is 60 minutes. The powder collected by the filter and the ultrafine powder collected by the filter are put into the post-...

Embodiment 2

[0065] Select LR-Fe-B-Ma alloy and HR-Fe-B-Mb alloy 600Kg smelting respectively according to the composition in the embodiment 2 of table 1, in the molten state, the alloy is cast onto the rotating copper roller with water cooling to cool and form the alloy During the smelting process, the cooling rate of the LR-Fe-B-Ma alloy and the HR-Fe-B-Mb alloy was adjusted by adjusting the rotating speed of the rotating copper roller, and the average grain size of the LR-Fe-B-Ma alloy was obtained as 2.3 μm; the average grain size of HR-Fe-B-Mb alloy is 1.3 μm; LR-Fe-B-Ma alloy and HR-Fe-B-Mb alloy sheets are selected for hydrogen crushing according to the ratio listed in Table 1, The alloy flakes after hydrogen crushing and the metal oxides listed in Table 1 are put into the mixer together in the ratio of Table 1, and mixed under nitrogen protection. The mixing time is 40 minutes. After mixing, airflow milling is carried out, and the The powder collected by the cyclone collector and th...

Embodiment 3

[0071]Select LR-Fe-B-Ma alloy and HR-Fe-B-Mb alloy 600Kg smelting respectively by the composition in the embodiment 3 of table 1, in molten state, the alloy is cast onto the rotating copper roller with water cooling and cooled to form alloy During the smelting process, the cooling rate of the LR-Fe-B-Ma alloy and the HR-Fe-B-Mb alloy was adjusted by adjusting the rotating speed of the rotating copper roller, and the average grain size of the LR-Fe-B-Ma alloy was obtained as 2.8-3.2μm; the average grain size of HR-Fe-B-Mb alloy is 2.1-2.4μm; select LR-Fe-B-Ma alloy and HR-Fe-B-Mb alloy sheets according to the ratio listed in Table 1 Carry out hydrogen crushing, put the alloy flakes after hydrogen crushing and the metal oxides listed in Table 1 into the mixer according to the ratio in Table 1, and mix the materials under the protection of nitrogen. The mixing time is 90 minutes, and the jet mill is carried out after mixing. For powder making, the powder collected by the cyclone ...

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Abstract

The invention discloses a method for manufacturing a La-and-Ce-contained neodymium iron boron rare earth permanent magnet. Raw materials are formed by LR-Fe-B-Ma alloy, HR-Fe-B-Mb alloy and metallic oxide micro powder, wherein the LR represents four rare earth elements which include La, Ce, Nd and Pr, the HR represents one or more rare earth elements which include Dy or Tb, the Ma represents one or more of Al, Co, Nb, Ga, Zr and Cu, and the Mb represents one or more of Al, Co, Nb, Ga, Zr, Cu and Mo. The manufacturing method includes the following working procedures: LR-Fe-B-Ma alloy smelting, HR-Fe-B-Mb alloy smelting, alloy hydrogen decrepitation, metallic oxide micro powder surface adsorbing and making, magnetic field forming, sintering and aging, and the neodymium iron boron rare earth permanent magnet is manufactured.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnets, in particular to a method for manufacturing a NdFeB rare earth permanent magnet containing La and Ce. Background technique [0002] NdFeB rare earth permanent magnets are used more and more for their excellent magnetic properties, and are widely used in medical nuclear magnetic resonance imaging, computer hard drives, audio, mobile phones, etc.; with the requirements of energy saving and low-carbon economy, NdFeB rare earth permanent magnets have begun to be used in auto parts, household appliances, energy-saving and control motors, hybrid vehicles, wind power generation and other fields. [0003] In 1983, Japanese patents 1,622,492 and 2,137,496 first disclosed the NdFeB rare earth permanent magnet invented by Sumitomo Metal, announced the characteristics, composition and manufacturing method of NdFeB rare earth permanent magnet, and confirmed that the main phase is Nd 2 Fe 14 B pha...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057
Inventor 孙宝玉
Owner SHENYANG GENERAL MAGNETIC
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