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Preparation method of neodymium iron boron magnetic material and magnetic material prepared by adopting method

A magnetic material, NdFeB technology, applied in magnetic materials, magnetic objects, inductance/transformer/magnet manufacturing, etc., can solve the problem of increasing the use pressure of NdFeB magnetic materials, increasing the cost of NdFeB magnetic materials, rising prices, etc. problems, to achieve the effect of reducing energy consumption, improving remanence, and improving fluidity

Pending Publication Date: 2021-08-06
慈溪市兴发磁业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the sharp increase in demand for neodymium, the current price of praseodymium-neodymium alloys has continued to rise, reaching 722,000-727,000 / ton, which greatly increases the cost of NdFeB magnetic materials and increases the use of NdFeB magnetic materials. pressure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The embodiment of the present application discloses a method for preparing an NdFeB magnetic material, comprising the following steps:

[0041] (1) Accurately weigh raw materials: 360kg of metal iron, 200kg of praseodymium-neodymium alloy, 28kg of boron-iron alloy, 15kg of metal cerium, 10kg of gadolinium-iron alloy, 0.8kg of metal copper, 3.2kg of metal aluminum, 2kg of metal cobalt and 1kg of metal zirconium.

[0042] Among them, metallic iron, praseodymium-neodymium alloy and boron-iron alloy are the basic raw materials for forming NdFeB magnetic materials. Metal cerium and gadolinium iron alloy are rare earth metals / alloys. The addition of the two is used to replace part of the expensive praseodymium neodymium alloy, which is conducive to reducing the cost of NdFeB magnetic materials; at the same time, the addition of gadolinium iron alloy is also conducive to improving the magnetic properties of NdFeB. The coercive force of the material. The addition of metal cop...

Embodiment 2-18

[0057] As shown in Table 1, Examples 2-18 are basically the same as Example 1, except that the ratio of raw materials weighed in step (1) is different.

[0058] Raw material ratio in the step (1) of the embodiment 1-18 of table 1

[0059] serial number iron NdPr Ferroboron cerium gadolinium iron copper aluminum cobalt zirconium Example 1 360 200 28 15 10 0.8 3.2 2 1 Example 2 362 196 30 15 10 0.8 3.2 2 1 Example 3 364 192 32 15 10 0.8 3.2 2 1 Example 4 367 187 34 15 10 0.8 3.2 2 1 Example 5 364 195 32 12 10 0.8 3.2 2 1 Example 6 364 190 32 17 10 0.8 3.2 2 1 Example 7 364 187 32 20 10 0.8 3.2 2 1 Example 8 364 196 32 15 6 0.8 3.2 2 1 Example 9 364 194 32 15 8 0.8 3.2 2 1 Example 10 364 190 32 15 12 0.8 3.2 2 1 Example 11 363.6 192 32 15 10 1.2 3.2 2 1 Example 12 363.3 192 32 15 10 1.5 3.2 ...

Embodiment 19-25

[0062] As shown in Table 2, Examples 19-25 are basically the same as Example 17, except that the control parameters in step (2) are different.

[0063] Table 2 Different control parameters in the step (2) of Embodiment 17, 19-25

[0064] serial number Melting temperature / ℃ Melting liquid pre-cooling temperature / ℃ Melting liquid holding time / min Example 17 1400 1300 5 Example 19 1500 1300 5 Example 20 1600 1300 5 Example 21 1500 1320 5 Example 22 1500 1350 5 Example 23 1500 1320 10 Example 24 1500 1320 12 Example 25 1500 1320 15

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Abstract

The invention relates to the field of magnetic materials, in particular to a preparation method of a neodymium iron boron magnetic material and the magnetic material prepared by adopting the method. The preparation method of the neodymium iron boron magnetic material comprises the following steps of: weighing raw materials; smelting the raw materials, pre-cooling the smelting liquid, preserving the heat, and performing melt-spinning to obtain a melt-spunning sheet; carrying out hydrogen demolishing, powdering and molding orientation on the melt-spinning sheet to obtain a blank; and sintering and tempering the blank to obtain the neodymium iron boron magnetic material. The neodymium iron boron magnetic material is prepared by adopting the preparation method. The magnet is made of the neodymium iron boron magnetic material. According to the preparation method, praseodymium-neodymium alloy is partially replaced by metal cerium and gadolinium-iron alloy, and meanwhile, the smelting liquid is pre-cooled and subjected to heat preservation before melt-spinning. Through cooperative implementation of the measures, the cost of the neodymium iron boron magnetic material is reduced, meanwhile, thereby guaranteeing that the neodymium iron boron magnetic material has good performance, and the requirements of actual use can be met.

Description

technical field [0001] This application relates to the field of magnetic materials, more specifically, it relates to a method for preparing an NdFeB magnetic material and the magnetic material prepared by the method. Background technique [0002] NdFeB magnetic material is based on tetragonal crystal composed of neodymium, iron and boron, and is a magnetic material with larger magnetic energy product and coercive force than ordinary magnetic materials. This material is widely used in high-end industries such as communication, medical treatment and electronics. [0003] In related technologies, NdFeB magnetic materials use metallic iron, praseodymium neodymium alloy, and boron-iron alloy as basic raw materials, and add auxiliary raw materials such as metallic copper, metallic aluminum, metallic cobalt, and metallic zirconium. The raw materials are mixed and placed in a vacuum smelting furnace for smelting; then the obtained smelting liquid is directly subjected to stripping ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F41/0253H01F41/0266H01F1/057H01F1/0577H01F1/0576H01F1/0573
Inventor 胡泽君胡建新胡建贞胡浩君霍海滨
Owner 慈溪市兴发磁业科技有限公司
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