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High-cost-performance rare earth permanent magnet and preparation method

A rare earth permanent magnet, cost-effective technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the unbalanced application of rare earth resources, the low application value of high-abundance rare earths, and the low cost performance of NdFeB recycled materials Advanced problems, to achieve good comprehensive magnetic properties, cost reduction, and reduce manufacturing costs

Active Publication Date: 2020-06-26
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One purpose of the invention is to provide a cost-effective rare earth permanent magnet. The permanent magnet uses sintered NdFeB recycled materials and high-abundance rare earth-based permanent magnet phases to obtain a cost-effective rare earth permanent magnet through chemical composition and organizational structure regulation. The use of NdFeB recycled materials alone is not cost-effective, the application of rare earth resources is unbalanced, and the application value of high-abundance rare earths is low.

Method used

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  • High-cost-performance rare earth permanent magnet and preparation method
  • High-cost-performance rare earth permanent magnet and preparation method
  • High-cost-performance rare earth permanent magnet and preparation method

Examples

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preparation example Construction

[0049] The preparation method of the cost-effective rare earth permanent magnet includes: sintered NdFeB reclaimed materials are classified into reclaimed materials-surface decoating-surface degreasing-recycled materials are crushed-screened to obtain small particle powder; the second main phase (and the first Three main phases) through batching-smelting quick-setting to obtain quick-setting sheets; after mixing small particles of NdFeB recycled material with quick-setting sheets, hydrogen breaking-jet mill-orientation molding-sintering and tempering treatment is performed to obtain cost-effective magnets.

[0050] Its preparation steps are as follows:

[0051] 1) Classification of recycled materials: classify different grades of NdFeB recycled materials, and store each kind of NdFeB recycled materials with similar components separately for future use;

[0052] 2) De-coating on the surface: removing the surface coating by pickling the recycled neodymium-iron-boron materials cl...

Embodiment 1

[0063] Example 1: 38M grade NdFeB magnetic steel recycled particles + Ce-based quick-setting tablets

[0064] 1. Classify and collect 38M brand NdFeB magnet recycle materials;

[0065] 2. Put the magnetic steel into the pickling tank, use hydrochloric acid with a concentration of 5% as the pickling solution, remove the electroplating layer on the surface, and obtain the reclaimed NdFeB magnetic steel without coating;

[0066] 3. Put the recovered NdFeB material obtained in step 2 into the degreasing tank, wash the recovered material by alkali washing method to remove surface impurities and oil stains, and then use a high-pressure water gun to clean the degreased NdFeB recovered material Rinse and dry to obtain clean NdFeB recycled materials;

[0067] 4. The NdFeB recycled material obtained in step 3 is roughly crushed by a jaw crusher, and sieved by magnetic suction to remove oxide layer particles to obtain small NdFeB recycled material particles with an average particle size...

Embodiment 2

[0075] Example 2: N38 brand NdFeB magnetic steel recycled material particles + Ce-based quick-setting tablets + Gd-based quick-setting tablets

[0076] 1. Classify and collect N38 grade NdFeB magnet reclaimed materials;

[0077] 2. Put the magnetic steel into the pickling tank, use hydrochloric acid with a concentration of 5% as the pickling solution, remove the electroplating layer on the surface, and obtain the reclaimed NdFeB magnetic steel without coating;

[0078] 3. Put the recovered NdFeB material obtained in step 2 into the degreasing tank, wash the recovered material by alkali washing method to remove surface impurities and oil stains, and then use a high-pressure water gun to clean the degreased NdFeB recovered material Rinse and dry to obtain clean NdFeB recycled materials;

[0079] 4. The NdFeB recycled material obtained in step 3 is roughly crushed by a jaw crusher, and sieved by magnetic suction to remove oxide layer particles to obtain small NdFeB recycled mate...

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Abstract

The invention relates to the technical field of rare-earth permanent magnet materials, in particular to a high-cost-performance rare-earth permanent magnet prepared from a sintered neodymium-iron-boron recycled material and a preparation method of the high-cost-performance rare-earth permanent magnet. The permanent magnet at least comprises two main phases, the first main phase component is a sintered neodymium iron boron recycled material phase, and the second main phase component is a high-abundance rare earth-based permanent magnet phase. According to the invention, the sintered neodymium iron boron reclaimed material and the high-abundance rare earth element are effectively utilized, a grain boundary phase is provided by the high-abundance rare earth phase, and the microstructure of the magnet is controlled by the processes of multiple times of powder mixing, low-temperature sintering and the like, so that the manufacturing cost of the magnet is greatly reduced, and meanwhile, thegood comprehensive magnetic performance is obtained.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials, and relates to a rare earth permanent magnet with high cost performance and a preparation method thereof. Background technique [0002] NdFeB permanent magnet materials are widely used in various fields of national life due to their excellent magnetic properties, and are one of the important basic materials of modern industry. Rare earth elements are the key to NdFeB permanent magnet materials, and account for more than 80% of the cost of raw materials. Due to the limited rare earth resources and the increasing demand in recent years, the price of rare earths has risen rapidly, and the development of cost-effective rare earth permanent magnets has become a current research hotspot. In the production process of NdFeB permanent magnet materials, about 25% of recycled materials will be produced in various process links and use links. The recycled materials contain a la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/053H01F1/057H01F41/02
CPCH01F1/053H01F1/057H01F41/0293H01F41/0266Y02W30/50
Inventor 韩瑞刘涛陈红升徐吉元董生智朱明刚李卫
Owner CENT IRON & STEEL RES INST
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