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Neodymium-iron-boron magnetic material and preparation method thereof

A magnetic material, neodymium-iron-boron technology, applied in the direction of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve the problems of reduced magnetic performance and abnormal use, so as to improve the coercive force, refine the particle size, The effect of optimizing process conditions

Active Publication Date: 2019-11-22
宁波可可磁业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the magnetic properties of general NdFeB magnets have dropped sharply when the working temperature rises to 120°C, and they cannot even be used normally.
However, the operating temperature of motors used in new energy vehicles and other fields is usually as high as 180°C. Obviously, ordinary NdFeB magnets cannot meet this high temperature requirement.

Method used

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  • Neodymium-iron-boron magnetic material and preparation method thereof
  • Neodymium-iron-boron magnetic material and preparation method thereof
  • Neodymium-iron-boron magnetic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Example 1: A NdFeB magnetic material, the components and their corresponding parts by weight are shown in Table 1, and are prepared through the following steps:

[0048] Step 1, smelting and casting: Weigh the raw materials of each element according to the formula requirements, put them into the induction melting furnace for melting at a temperature of 1350°C, vacuumize the induction melting furnace to 0.1Pa, melt into uniform molten steel, and pour the molten steel into The speed is 42m / s on the water-cooled copper roller and can be cooled rapidly, and the cast sheet is thrown out by centrifugal force to the water-cooled plate with a system temperature of 10°C to continue cooling, and the cast sheet with an average thickness of 0.2mm is obtained for use;

[0049]Step 2, hydrogen crushing: put the cast piece into the hydrogen furnace, fill it with hydrogen gas, carry out hydrogen crushing treatment on the cast piece to obtain the cast piece coarse powder, and then use th...

Embodiment 2-6

[0052] Embodiment 2-6: An NdFeB magnetic material, the difference from Embodiment 1 is that each component and its corresponding parts by weight are shown in Table 1.

[0053] Each component and parts by weight thereof in table 1 embodiment 1-6

[0054]

Embodiment 7

[0055] Embodiment 7: A kind of NdFeB magnetic material, the specific preparation steps are as follows:

[0056] Step 1, smelting and casting: Weigh the raw materials of each element according to the formula requirements, put them into the induction melting furnace for melting at a temperature of 1550°C, vacuumize the induction melting furnace at 1Pa, melt into uniform molten steel, and pour the molten steel up to the speed 42m / s water-cooled copper roller and can be cooled rapidly, and the casting sheet is thrown out by centrifugal force to a water-cooled plate with a system temperature of 10°C to continue cooling to obtain a casting sheet with an average thickness of 3.8mm for use;

[0057] Step 2, hydrogen crushing: put the cast piece into the hydrogen furnace, fill it with hydrogen gas, carry out hydrogen crushing treatment on the cast piece to obtain the cast piece coarse powder, and then use the jet mill method to further grind the hydrogen crushed cast piece coarse powder...

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Abstract

The invention discloses a neodymium-iron-boron magnetic material and a preparation method thereof, and relates to the technical field of magnetic material preparation. The neodymium-iron-boron magnetic material is characterized by comprising the following raw materials in percentage by weight: 25-30% of PrNd, 0.5-3% of Dy, 0.95-0.98% of B, 0.1-0.2% of Cu, 0.1-0.4% of Al, 0-0.2% of Nb, 0.15-0.3% ofGa, and 1-1.5% of Co and is balanced with Fe; and other rare earth elements are added into the raw materials, and the addition amount of the rare earth elements is controlled, so that the prepared neodymium-iron-boron magnetic material has excellent high-temperature resistance.

Description

technical field [0001] The invention relates to the technical field of magnetic material preparation, more specifically, it relates to a neodymium-iron-boron magnetic material and a preparation method thereof. Background technique [0002] NdFeB magnets are tetragonal crystals formed of neodymium, iron and boron, which belong to the third generation of rare earth permanent magnet materials, and have the characteristics of small size, light weight and strong magnetism. NdFeB magnets (BH) max The value is 5-12 times that of ferrite magnets and 3-10 times that of alnico magnets. Because NdFeB permanent magnets have excellent properties such as high remanence, high coercive force, high magnetic energy product and high cost performance, they are currently the most magnetic permanent magnet materials, so NdFeB permanent magnets have been widely used in the market. application. [0003] NdFeB is more and more widely used in the field of motors. Because the motor will generate a ...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0253H01F41/0266
Inventor 冯立峰
Owner 宁波可可磁业股份有限公司