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High-corrosion-resistant rare-earth permanent magnetic powder and preparation method for same

A rare earth permanent magnet and permanent magnet powder technology, applied in the field of rare earth permanent magnet materials, can solve the problems of reducing the magnetic properties of magnetic powder or magnet, and achieve the effect of reducing the number of defects and improving the efficiency of nitriding or oxygen absorption

Active Publication Date: 2017-12-22
GRIREM ADVANCED MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, non-metal elements are generally non-magnetic elements, and the doping of non-metal elements will inevitably reduce the magnetic properties of magnetic powder or magnets.

Method used

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  • High-corrosion-resistant rare-earth permanent magnetic powder and preparation method for same
  • High-corrosion-resistant rare-earth permanent magnetic powder and preparation method for same
  • High-corrosion-resistant rare-earth permanent magnetic powder and preparation method for same

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Embodiment Construction

[0049] The technical effects of the present invention will be described below in conjunction with specific embodiments, and the embodiments are only used to illustrate the invention without limiting the scope of the invention itself.

[0050] The comprehensive performance evaluation of magnetic powder includes magnetic performance characterization and corrosion resistance performance characterization.

[0051] The magnetic performance test uses a vibrating sample magnetometer (VSM), and the test items include remanence Br (kGs), coercive force Hcj (kOe), and magnetic energy product BHmax (MGOe).

[0052] Corrosion resistance The electrochemical workstation (reference 600) is used to test the open circuit potential and tafer curve of the sample, and then its self-corrosion potential Es (mv) is obtained. The level of self-corrosion potential represents the quality of corrosion resistance.

[0053] The present invention is a kind of rare earth permanent magnet powder, and its com...

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Abstract

The invention discloses rare-earth permanent magnetic powder, wherein content ratios of O element to N element, namely division values are different in a surface layer area, an inner layer area and a center area of the permanent magnetic powder, and gradually decrease. According to the invention, contents of non-magnetic elements such as O and N in the magnetic powder are reduced during preparation at first; then, the contents of O and N in the magnetic powder surface layer are increased through nitriding and oxygen absorption; types and organizational structures of compounds in the magnetic powder surface layer are changed through technologies of optimal nitriding and oxygen absorption; and thus, corrosion resistance of the magnetic powder is enhanced significantly on the premise that magnetic performance of the neodymium-iron-boron magnetic powder is not reduced.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet materials, and relates to a rare earth permanent magnet powder with high corrosion resistance and a preparation method thereof; more specifically, it relates to a high corrosion resistance NdFeB series rare earth permanent magnet powder and a preparation method thereof. Background technique [0002] Neodymium-iron-boron (NdFeB) rare earth permanent magnet materials have become irreplaceable basic materials in many fields, and are widely used in many fields such as electronics, automobiles, and computers, driving the development of various industries. NdFeB series rare earth permanent magnet materials are generally required to work at a certain temperature and environment, and are required to maintain the integrity of their dimensions and the stability of their magnetic properties during long-term work. However, due to the poor corrosion resistance of the material, the composition and str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057B22F9/04B22F1/00C23C8/24C23C8/12
CPCH01F1/0572C23C8/12C23C8/24B22F9/04B22F1/142B22F1/145
Inventor 毛永军罗阳权宁涛于敦波闫文龙李红卫张洪滨孙亮
Owner GRIREM ADVANCED MATERIALS CO LTD
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