Manufacturing method for Ce-containing NdFeB rare earth permanent magnet

A technology of rare earth permanent magnets and manufacturing methods, which is applied in the fields of inductance/transformer/magnet manufacturing, magnetic objects, magnetic materials, etc., and can solve problems such as rising rare earth prices, shortage of heavy rare earth elements, and rare earth shortage

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

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  • Manufacturing method for Ce-containing NdFeB rare earth permanent magnet

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Experimental program
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Embodiment 1

[0059] Select Ce-LR-Fe-B-Ma alloy and Ce-HR-Fe-B-Mb alloy 600Kg smelting respectively according to Table 1 Example 1 composition, and in molten state, the alloy is cast to cooling on the rotating copper roll with water cooling Alloy flakes are formed. During the smelting process, the cooling rate of Ce-LR-Fe-B-Ma alloy and Ce-HR-Fe-B-Mb alloy is adjusted by adjusting the rotating speed of the rotating copper roller to obtain Ce-LR-Fe-B- The average grain size of the Ma alloy is 2.8 μm; the average grain size of the Ce-HR-Fe-B-Mb alloy is 1.8 μm; the Ce-LR-Fe-B-Ma alloy and the Ce alloy are selected according to the ratio listed in Table 1. -HR-Fe-B-Mb alloy flakes are subjected to hydrogen crushing, and the alloy flakes after hydrogen crushing and the metal oxides listed in Table 1 are put into the mixer according to the ratio of Table 1, and mixed under nitrogen protection. The time is 60 minutes. After the mixing, airflow milling is carried out. The powder collected by the c...

Embodiment 2

[0066] Choose respectively Ce-LR-Fe-B-Ma alloy and Ce-HR-Fe-B-Mb alloy 600Kg smelting according to the composition in Example 2 of Table 1, and the alloy is cast to the rotating copper roller with water cooling in molten state The upper cooling forms alloy flakes. During the smelting process, the cooling rate of Ce-LR-Fe-B-Ma alloy and Ce-HR-Fe-B-Mb alloy is adjusted by adjusting the rotation speed of the rotating copper roller to obtain Ce-LR-Fe- The average grain size of the B-Ma alloy is 2.3 μm; the average grain size of the Ce-HR-Fe-B-Mb alloy is 1.3 μm; the Ce-LR-Fe-B-Ma alloy is selected according to the ratio listed in Table 1 Carry out hydrogen crushing with Ce-HR-Fe-B-Mb alloy flakes, put the alloy flakes after hydrogen crushing and the metal oxides listed in Table 1 into the mixer according to the ratio of Table 1, and mix under nitrogen protection. The mixing time is 40 minutes. After the mixing, airflow milling is carried out. The powder collected by the cyclone co...

Embodiment 3

[0072] Choose Ce-LR-Fe-B-Ma alloy and Ce-HR-Fe-B-Mb alloy 600Kg smelting respectively by the composition in the embodiment 3 of table 1, alloy is poured to the rotary copper roll of band water cooling under molten state The upper cooling forms alloy flakes. During the smelting process, the cooling rate of Ce-LR-Fe-B-Ma alloy and Ce-HR-Fe-B-Mb alloy is adjusted by adjusting the rotation speed of the rotating copper roller to obtain Ce-LR-Fe- The average grain size of B-Ma alloy is 2.8-3.2 μm; the average grain size of Ce-HR-Fe-B-Mb alloy is 2.1-2.4 μm; select Ce-LR-Fe- The B-Ma alloy and the Ce-HR-Fe-B-Mb alloy flakes are subjected to hydrogen crushing, and the alloy flakes after the hydrogen crushing are put into the mixer together with the metal oxides listed in Table 1 according to the ratio of Table 1, and placed under nitrogen protection Down-mixing, the mixing time is 90 minutes, airflow milling is carried out after mixing, the powder collected by the cyclone collector an...

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Abstract

The invention discloses a manufacturing method for a Ce-containing NdFeB rare earth permanent magnet. The Ce-containing NdFeB rare earth permanent magnet is made of Ce-LR-Fe-B-Ma alloy, Ce-HR-Fe-B-Mb alloy and metal oxide micro-powder, wherein LR represents two or more rare-earth elements which do not contain Ce but contain Nd and Pr; HR represents one or more rare-earth elements which do not contain Ce but contain Dy or Tb; Ma represents one or more elements of Al, Co, Nb, Ga, Zr, and Cu; Mb represents one or more elements of Al, Co, Nb, Ga, Zr, Cu and Mo. The manufacturing method for the Ce-containing NdFeB rare earth permanent magnet comprises the following working procedures of smelting the Ce-LR-Fe-B-Ma alloy, smelting the Ce-HR-Fe-B-Mb alloy, performing hydrogen decrepitation on the alloy, performing surface adsorption on the metal oxide micro-powder and pulverization, performing magnetic field forming, performing sintering and performing aging. In this way, the NdFeB 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 Ce-containing NdFeB rare earth permanent magnet. 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 phase, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F1/0577C22C33/04C22C33/06B22F2009/044B22F2998/10B22F2999/00H01F41/0293C22C38/16C22C38/14C22C38/12C22C38/06C22C38/002C22C38/10C22C38/005H01F41/0266
Inventor 孙宝玉
Owner SHENYANG GENERAL MAGNETIC
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