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Neodymium iron boron magnetic material with high coercivity

A magnetic material, high coercivity technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the damage of the neodymium-rich phase structure in the neodymium iron boron, the decrease of the intrinsic coercivity of the neodymium iron boron, the neodymium iron boron Magnet demagnetization and other problems, to achieve the effect of good cleaning, saving grinding time and improving particle size distribution

Inactive Publication Date: 2014-03-05
NINGBO STAR MATERIALS HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many deficiencies in the sintering of NdFeB magnets at this stage. Specifically, the traditional smelting process severely damages the crystal structure of NdFeB in the microstructure, which leads to damage to the neodymium-rich phase structure in NdFeB. , so that the intrinsic coercivity of NdFeB magnets can be reduced, making NdFeB magnets prone to demagnetization and affecting the use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A neodymium-iron-boron magnetic material with high coercivity, which is formed by mixing a main phase alloy and an auxiliary phase alloy; the main phase alloy is configured by weight percentage of the following raw materials: iron 64.5%, boron 1.2% , 34.1% neodymium, 0.1% molybdenum, 0.1% gallium; the auxiliary phase alloy is prepared by the following raw materials by weight percentage: iron 53.8%, boron 1.2%, neodymium 19.5%, praseodymium 14.3%, terbium 10.2%, cobalt 1.0%.

[0065] In the above scheme, the molybdenum in the main phase alloy can improve the coercive force of the magnet by refining the grains and inhibiting the precipitation of the soft magnetic phase; while gallium can also significantly increase the coercive force of the alloy, and gallium in the cobalt-containing alloy The effect is more obvious. In the auxiliary phase alloy, terbium and praseodymium have a good effect on improving the coercive force of the magnet; cobalt can completely replace th...

Embodiment 2

[0123] A neodymium-iron-boron magnetic material with high coercive force, which is formed by mixing a main phase alloy and an auxiliary phase alloy; the main phase alloy is configured by weight percentage of the following raw materials: iron 68.2%, boron 1.2% , 30.2% neodymium, 0.2% molybdenum, 0.2% gallium; the auxiliary phase alloy is prepared by the following raw materials according to weight percentage: iron 54.2%, boron 0.8%, neodymium 20.2%, praseodymium 13.4%, terbium 10.6%, cobalt 0.8%.

[0124] In the above scheme, the molybdenum in the main phase alloy can improve the coercive force of the magnet by refining the grains and inhibiting the precipitation of the soft magnetic phase; while gallium can also significantly increase the coercive force of the alloy, and gallium in the cobalt-containing alloy The effect is more obvious. In the auxiliary phase alloy, terbium and praseodymium have a good effect on improving the coercive force of the magnet; cobalt can completely ...

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Abstract

The invention relates to a neodymium iron boron magnetic material with the high coercivity. The neodymium iron boron magnetic material with the high coercivity is formed by a main-phase alloy and a secondary-phase alloy through mixing. The main-phase alloy comprises, by weight, 64.5-68.5% of iron, 1.0-1.2% of boron, 30.2-34.3% of neodymium, 0.05-0.4% of molybdenum and 0.1-0.4% of gallium. The secondary-phase alloy comprises, by weight, 50.8-54.2% of iron, 0.8-1.2% of boron, 18.9-21.1% of neodymium, 12.8-16.3% of praseodymium, 8.9-11.1% of terbium, and 0.8-1.2% of cobalt. The neodymium iron boron magnetic material prepared with the method has high intrinsic coercivity.

Description

technical field [0001] The invention relates to a magnetic material and a production process thereof, in particular to an NdFeB magnetic material with high coercive force and a production process thereof. Background technique [0002] NdFeB magnetic materials, as the latest result of the development of rare earth permanent magnet materials, are widely used due to their excellent magnetic properties. However, there are still many deficiencies in the sintering of NdFeB magnets at this stage. Specifically, the traditional smelting process severely damages the crystal structure of NdFeB in the microstructure, which leads to damage to the neodymium-rich phase structure in NdFeB. , so that the intrinsic coercive force of NdFeB magnets can be reduced, making NdFeB magnets prone to demagnetization and affecting the use. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an NdFeB magnetic material and its production process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057C22C33/04B22F9/16B22F1/00
Inventor 苏广春关井和陈益明
Owner NINGBO STAR MATERIALS HI TECH
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