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Neodymium iron boron radially oriental ring and preparation method thereof

A technology of radiation orientation and neodymium iron boron, which is applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve the problems of radiation ring fragmentation, increased manufacturing costs, and sensitive manufacturing processes, and achieve uniform molding density and size The effect of high precision and uniform orientation

Active Publication Date: 2015-07-01
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although anisotropic magnetic powder is used to make injection NdFeB radiation rings, its magnetic properties are 2 to 3 times higher than that of isotropic bonded NdFeB, but compared with sintered NdFeB, the comprehensive magnetic properties are still only sintered. About a quarter of that, and the HDDR anisotropic NdFeB magnetic powder manufacturing process is sensitive, and the batch consistency is poor, which greatly increases the manufacturing cost and reduces the batch consistency
[0009] Based on the above, it can be seen that the current preparation method has two difficulties in the production of NdFeB radiation rings: (1) the uniformity of the NdFeB radiation orientation in the forming (or pressing) stage; (2) due to the shrinkage of NdFeB Anisotropic characteristics, the production process needs to overcome the stress in different areas of the radiation ring sintering, to avoid the cracking of the radiation ring

Method used

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  • Neodymium iron boron radially oriental ring and preparation method thereof
  • Neodymium iron boron radially oriental ring and preparation method thereof
  • Neodymium iron boron radially oriental ring and preparation method thereof

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preparation example Construction

[0042] The preparation method of the NdFeB radiation orientation ring according to the embodiment of the present invention comprises the following steps:

[0043] a) NdFeB alloy powder is provided, the composition of the NdFeB alloy powder is Re a Fe (1-a-b-c) B b m c , wherein a, b, and c respectively represent the atomic percentages of each element, 14at%≤a≤18at%, 5at%≤b≤6at%, 0≤c≤5at%, Re is selected from Nd, Pr, Dy, At least one of Tb, Ho, and Gd, and M selected from at least one of Co, Al, Cu, Zr, Ni, Sn, Ga, Nb, Mo, Ti, and V.

[0044] Here, it should be noted that as long as the NdFeB alloy powder satisfies the above-mentioned composition, it can be prepared by itself, or a commercially available alloy powder can be used.

[0045] For example, the following methods can be used to prepare NdFeB alloy powder:

[0046] a-1) Proportioning the metal powders according to the composition, and casting the metal powders after smelting in a vacuum induction furnace into thin...

Embodiment 1

[0073] Preparation of NdFeB alloy flakes by quick-setting flake technology, the composition of which is Nd 11.94 Dy 1.97 Tb 0.4 Fe 77.62 B 5.92 m 余 (The elements contained in M ​​and their atomic content are: Co=1.09, Al=0.3, Cu=0.25, Zr=0.25, Ga=0.1, Nb=0.16). NdFeB alloy flakes absorb hydrogen under 1.1Mpa hydrogen pressure for 2.5h, and dehydrogenate at 500°C for 8h to obtain hydrogen crushed powder. And the crushed hydrogen powder was ground into alloy powder with a particle size of 3 μm.

[0074] Then, metal Dy powder with a content of 1wt% relative to the NdFeB alloy powder and an average particle size of 5 μm is added to the alloy powder by weight, and 0.8wt% antioxidant is added at the same time, wherein the antioxidant is diethyl malonate, petroleum Ether and polyethylene oxide monofatty acid are obtained in a mass ratio of 2:5:1. The mixture was mixed in a three-dimensional mixer for 3 hours, and the mixing tank was filled with argon for protection.

[0075] ...

Embodiment 2

[0093] The neodymium-iron radiating rings were prepared under the same conditions as in Example 1 except for the parts specified below.

[0094] The formula of NdFeB alloy flakes is (Pr-Nd) 10.95 Dy 2.42 Tb 1.65 Fe 76.8 B 6 m 余 (The elements contained in M ​​and their atomic content are: Co=1.12, Al=0.3, Cu=0.3, Zr=0.2, Ga=0.15, Nb=0.11). After hydrogen crushing and jet milling, it becomes 4μm powder.

[0095] Add metal Dy powder with a content of 0.5wt% relative to the NdFeB alloy powder and an average particle size of 5 μm by weight, and add 1wt% antioxidant at the same time. Antioxidant ratio: diethyl malonate, petroleum ether, polyepoxide The mass ratio of ethane monofatty acid to triethylene glycol is 2:5:1:1.

[0096] Heat and knead in an argon-protected atmosphere tank for 4 hours at a kneading temperature of 155°C. The amount of organic matter added is (according to the total mass percentage after addition): 3.1wt% polyethylene (PP), 2.7wt% paraffin, 10.2wt% ca...

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Abstract

The invention provides a neodymium iron boron radially oriental ring and a preparation method thereof. The preparation method of the neodymium iron boron radially oriental ring comprises the following steps of (a) providing neodymium iron boron alloy powder comprising ReaFe (1-a-b-c) BbMc; (b) adding antioxidant of which the content is 0.1-2wt% relative to the neodymium iron boron alloy powder in the neodymium iron boron alloy powder and mixing the antioxidant and the neodymium iron boron alloy powder to obtain mixed powder; (c) adding organic solvent in the mixed powder and milling the mixed powder and the organic solvent in an inert atmosphere at the temperature of 150-180 DEG C to obtain injecting slurry; (d) performing injection molding on the injecting slurry on a magnetic field orienting injection molding machine to obtain green bodies; and (e) removing organic matters in the green bodies and sintering the green bodies in an inert gas atmosphere or under a vacuum condition at the temperature of 1050-1120 DEG C to obtain the neodymium iron boron radially oriental ring. In the Reafe (1-a-b-c) BbMc of the neodymium iron boron alloy powder, a, b and c respectively stand for atomic percents of various elements, a is greater than or equal to 14at% and smaller than or equal to 18at%, b is greater than or equal to 5at% and smaller than 7at%, c is greater than or equal to 0 and smaller than or equal to 5at%, Re is at least one rare earth metal powder of Nd, Pr, Dy, Tb, Ho and Gd, and M is at least one of Co, Al, Cu, Zr, Ni, Sn, Ga, Nb, Mo, Ti and V.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials and their preparation, in particular to a neodymium-iron-boron radiation orientation ring and a preparation method thereof. Background technique [0002] NdFeB rare earth permanent magnet material was discovered in the 1980s and is the permanent magnet material with the highest comprehensive magnetic performance today. Since its discovery, the NdFeB industry has developed rapidly and is widely used in wind power, motors, electroacoustics, IT, medical and other industries, and has become one of the green new energy materials in modern industry. [0003] Among them, the circular magnets oriented radially or radially (referred to as radiation rings) have broad application prospects in the field of motors and sensors, especially in order to meet the requirements of energy saving and high efficiency. It is a kind of trend, so the radial magnetic ring with small size is mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22B22F5/10H01F41/02
Inventor 张素荣金启明吴波
Owner BYD CO LTD