A preparation method of high-performance sintered NdFeB with low dysprosium content

A high-performance, neodymium-iron-boron technology, applied in the direction of magnetic objects, magnetic materials, electrical components, etc., can solve problems such as effect discount, achieve the effect of reducing the amount of dysprosium element, controlling consumption, and increasing the maximum magnetic energy product

Active Publication Date: 2011-12-14
NANJING UNIV OF SCI & TECH +1
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AI Technical Summary

Problems solved by technology

However, despite the surface plating of Dy 2 o 3 The method is very effective in the test of small samples. For the large-scale sintered NdFeB magnets that are widely used at present, such as various large-scale magnetic tiles used in wind power generators, the effect of using this surface infiltration method will be greatly reduced.

Method used

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  • A preparation method of high-performance sintered NdFeB with low dysprosium content
  • A preparation method of high-performance sintered NdFeB with low dysprosium content

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. Prepare the master alloy. The atomic percentage composition of the raw materials is: Nd: 14.0%, Fe: 78.4%, B: 5.5%, Co: 1.0%, Al: 0.5%, Cu: 0.3%, Nb: 0.3%; the raw materials Placed in a vacuum electric arc furnace, using a copper mold casting process to prepare master alloy ingots.

[0017] 2. After the master alloy ingot is crushed by hydrogen explosion, add 0.5% of the total weight of the alloy powder to gasoline, 3% of the total weight of the alloy powder to prevent oxidation, and 0.1% of the total weight of the alloy powder to add a lubricant to the powder. Place it in a jet mill for further crushing to make a powder with an average particle size of 4mm.

[0018]3. The powder made by jet milling is placed on the rolling sample stage of the magnetron sputtering equipment used for powder particle coating. Metal Dy is used as the target material. After the magnetron sputtering system is evacuated, the target material components are sputtered on the powder falling w...

Embodiment 2

[0023] 1. Prepare the master alloy. The atomic percentage composition of the raw materials is: Nd: 8.0%, Fe: 74.5%, B: 7.0%, Co: 2.5%, Al: 1.5%, Cu: 0.3%, Nb: 0.2%, Ga: 0.5%, La: 0.5%, Ce: 0.5%, Sm: 0.5%, Gd: 0.5%, Ho: 0.5%, Sc: 0.5%, Y: 0.5%; the raw materials are placed in a vacuum induction quick solidification casting furnace , to prepare quick-setting slabs of master alloy.

[0024] 2. After crushing the master alloy quick-setting thick sheet by hydrogen explosion, add 1.0% of the total weight of the alloy powder to gasoline, 0.5% of the total weight of the alloy powder to special antioxidants and 0.05% of the total weight of the alloy powder to lubricate The agent is further crushed in a jet mill to make a powder with an average particle size of 4.5 mm.

[0025] 3. The powder made by jet milling is placed on the rolling sample stage of the magnetron sputtering equipment used for powder particle coating. Metal Dy is used as the target material. After the magnetron sputt...

Embodiment 3

[0030] 1. Prepare the master alloy. The atomic percentage composition of the raw materials is: Nd: 11.0%, Fe: 76.7%, B: 6.3%, Co: 1.0%, Al: 1.5%, Cu: 0.2%, Nb: 0.3%, Ga: 0.5%, Pr: 2.5%; the raw materials are placed in a vacuum electric arc furnace, and the master alloy ingot is prepared by using a copper mold casting process.

[0031] 2. After the master alloy ingot is crushed by hydrogen explosion, add 0.75% of the total weight of the alloy powder to gasoline, 1.5% of the total weight of the alloy powder to prevent oxidation, and 0.075% of the total weight of the alloy powder to add a lubricant to the powder. Place it in a jet mill for further crushing to make a powder with an average particle size of 6 mm.

[0032] 3. The powder made by jet milling is placed on the rolling sample stage of the magnetron sputtering equipment used for powder particle coating. Metal Dy is used as the target material. After the magnetron sputtering system is evacuated, the target material compon...

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Abstract

The invention discloses a method for preparing sintered NdFeB with low dysprosium (Dy) content and high performance; the method comprises the following steps of: sputtering and plating the Dy element on the surface of jet mill powder by using the powder plate technology based on magnetron sputtering on the basis of preparing NdFeB powder, and then sufficiently dispersing the Dy element to micron-sized NdFeB crystal particles by dispersing the Dy element at high temperature in the sintering and tempering process, thereby achieving the effect of improving magnetic performance of the sintered NdFeB. Compared with the introduction of the Dy element in the proportioning process of the prior art, the method disclosed by the invention has the advantages: the low dysprosium content and high performance is limited in the nano-size by adopting the physical gas-phase deposition, the consumption quantity of the Dy element during the production process is controlled effectively and the preparationof sintered NdFeB with low dysprosium content and high performance is realized. Compared with the sintered NdFeB of the same components prepared by the traditional casting and powder metallurgy process, both the intrinsic coercivity and the maximum magnetic energy product of the sintered NdFeB rare-earth permanent magnetic material obtained according to the invention are improved obviously; compared with the sintered NdFeB with the same performance prepared by the traditional casting and powder metallurgy process, the dosage of the dysprosium element is reduced remarkably. The method can be widely applicable to producing and manufacturing sintered NdFeB with high performance.

Description

technical field [0001] The invention belongs to the preparation technology of magnetic materials, in particular to a preparation method of high-performance sintered NdFeB with low dysprosium content. Background technique [0002] Sintered NdFeB rare earth permanent magnet materials have been widely used in electronics, automobiles, computers, electricity, machinery, energy, environmental protection, national defense, medical equipment and many other fields since their invention in 1983. Sintered NdFeB materials form the main phase and grain boundary phase during the powder metallurgy process. The atomic ratio of the main phase is close to Nd:Fe:B=2:14:1, and the grain boundary phase mainly refers to the rare earth-rich phase (also known as the neodymium-rich phase). In order to increase the intrinsic coercive force and the maximum service temperature of sintered NdFeB magnets, the commonly used methods include strengthening the grain boundary phase and increasing the magnet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057C22C38/00C22C33/02B22F9/04B22F1/02B22F3/16
Inventor 徐锋陈光卢国文朱海南陆凤琪杨义恒管宏胜范从平
Owner NANJING UNIV OF SCI & TECH
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