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Neodymium iron boron magnet added with terbium powder and preparation method thereof

A NdFeB magnet technology, applied in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problem of residual magnetism and magnetic energy product reduction, sintered NdFeB magnet corrosion resistance and mechanical properties are not reflected, The coercive force of NdFeB magnets is not obviously improved, and the effect of improving the coercivity, the preparation method is simple and feasible, and the coercive force and temperature stability are improved.

Inactive Publication Date: 2015-04-29
NINGBO GERONGLI MAGNETIC IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the follow-up effect of preparing NdFeB magnets by this method is that the coercive force does not increase significantly, and the remanence and energy product decrease significantly.
Moreover, this application document does not reflect the improvement of the corrosion resistance and mechanical properties of sintered NdFeB magnets.

Method used

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  • Neodymium iron boron magnet added with terbium powder and preparation method thereof
  • Neodymium iron boron magnet added with terbium powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Batching and smelting: batching is carried out according to the composition and mass percentage of the NdFeB magnets described in Example 1 of Table 1, and then sent to a vacuum quick-setting melting furnace and preheated by power supply, and then vacuumed to 10 -3 PaPa, stop vacuuming and fill in high-purity argon (content ≥ 99.99%) to reach 0.045MPa and then smelt. After the furnace charge is completely melted, perform scale casting at a cooling roll speed of 2.60m / s to obtain an average thickness of 0.20mm. Strip sheet; wherein the charge is praseodymium-neodymium alloy with a Pr content of 22%-28%, gadolinium-iron alloy with a Gd content of 60%-65%, boron-iron alloy with a B content of 15%-20%, industrial aluminum ingots, Iron ingots and electrolytic copper.

[0030] Hydrogen crushing and air-jet milling treatment: the above-mentioned flakes are subjected to hydrogen crushing treatment to obtain crushed powder with an average particle size of 10.0 μm, and then Tb po...

Embodiment 2

[0035] Batching and smelting: Batching is carried out according to the composition and mass percentage of the NdFeB magnets described in Example 2 of Table 1, and then sent to the vacuum quick-setting melting furnace and preheated by power supply, and then vacuumed to 6×10 -3 Pa, stop vacuuming and fill in high-purity argon (content ≥ 99.99%) to reach 0.048MPa and then smelt. After the furnace charge is completely melted, perform scale casting at a cooling roll speed of 2.65m / s to obtain an average thickness of 0.40mm. Strip sheet; wherein the charge is praseodymium-neodymium alloy with a Pr content of 22%-28%, gadolinium-iron alloy with a Gd content of 60%-65%, boron-iron alloy with a B content of 15%-20%, industrial aluminum ingots, Iron ingots and electrolytic copper.

[0036] Hydrogen crushing and jet milling treatment: The above-mentioned flakes are subjected to hydrogen crushing treatment to obtain crushed powder with an average particle size of 11.0 μm, and then Tb powd...

Embodiment 3

[0041] Batching and smelting: batching is carried out according to the composition and mass percentage of the NdFeB magnets described in Example 3 of Table 1, and then sent to the vacuum quick-setting melting furnace and preheated by power supply, and then vacuumed to 10 -2 Pa, stop vacuuming and fill in high-purity argon (content ≥ 99.99%) to reach 0.050MPa and then smelt. After the furnace charge is completely melted, perform scale casting at a cooling roll speed of 2.70m / s to obtain an average thickness of 0.50mm. Strip sheet; wherein the charge is praseodymium-neodymium alloy with a Pr content of 22%-28%, gadolinium-iron alloy with a Gd content of 60%-65%, boron-iron alloy with a B content of 15%-20%, industrial aluminum ingots, Iron ingots and electrolytic copper.

[0042] Hydrogen crushing and air-jet milling treatment: the above-mentioned flakes were subjected to hydrogen crushing to obtain crushed powder with an average particle size of 12.0 μm, and then Tb powder and ...

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Abstract

The invention specifically relates to neodymium iron boron magnet added with terbium powder and a preparation method thereof, belonging to the technical field of magnetic material. The composition and mass percentage of the neodymium iron boron magnet are as follows: 28.40-28.8% of PrNd, 2.70-2.90% of Gd, 0.95-0.98% of B, 0.70-0.78% of Al, 0.22-0.25% of Cu and 0.10-0.30% of Tb, and the remaining is Fe. The invention further provides a method for preparing the neodymium iron boron magnet, comprising the following steps of: firstly compounding; then smelting, casting in a manner of scale to obtain melt-spinning sheets; and then hydrogen-smashing, airflow-grinding, spark plasma sintering and second temper heat treating to obtain neodymium iron boron magnet end products. The neodymium iron boron magnet of the invention has relatively high coercive force, residual magnetism and magnetic energy product simultaneously, good corrosion resistance and good mechanical property. The preparation method is simple and practicable.

Description

technical field [0001] The invention relates to a neodymium-iron-boron magnet, in particular to a neodymium-iron-boron magnet added with terbium powder and a preparation method thereof, belonging to the technical field of magnetic materials. Background technique [0002] As a new generation of rare earth permanent magnet materials, NdFeB magnets have the characteristics of high remanence, high coercive force and high magnetic energy product, and are the permanent magnet materials with the strongest comprehensive magnetic properties in the world today. With the development of electronic information, automobile and machinery manufacturing industry, NdFeB magnets have also developed rapidly, especially now that people's awareness of environmental protection is getting stronger and stronger. The demand for NdFeB permanent magnets continues to grow. [0003] NdFeB magnets can be divided into sintered NdFeB magnets and bonded NdFeB magnets. Sintered NdFeB magnets are currently th...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02B22F1/00B22F3/16
Inventor 钱寅
Owner NINGBO GERONGLI MAGNETIC IND
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