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Microwave sintered NdFeB magnet and preparation method thereof

A microwave sintering and magnet technology, applied in the fields of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve problems such as the influence of the use range of magnets, and achieve the effect of enhancing the effect of micropowder lubrication, isolating air, and improving sintering efficiency

Active Publication Date: 2018-06-15
宁波金轮磁材技术有限公司
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Problems solved by technology

[0003] Due to the characteristics of NdFeB material, in the past technology, if the coercive force Hcj of the magnet is to be increased, the remanence Br of the magnet will be affected; if the remanence Br of the magnet is to be increased, the coercive force Hcj of the magnet will be affected Therefore, the magnet has a higher Hcj but cannot have a higher magnetic energy product (BH)max at the same time, which affects the use range of the magnet to a certain extent.

Method used

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  • Microwave sintered NdFeB magnet and preparation method thereof
  • Microwave sintered NdFeB magnet and preparation method thereof
  • Microwave sintered NdFeB magnet and preparation method thereof

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Embodiment 1

[0051] A preparation method of sintered NdFeB magnet, comprising the following steps:

[0052] Step 1, 15.0wt% Nd, 4.2wt% Pr, 1.0wt% Tb, 0.1wt% Co, 0.94wt% B, 0.05% Ag, 0.08wt% Cu, 0.04wt% Si, 1.2wt% Zn, 0.6wt% %Sn, 0.82wt% Zr, 74.59wt% Fe and non-removable impurities are added to the vacuum induction quick solidification furnace for melting, and the melting temperature is controlled at 2800 ° C. Here, Cu and Si are made of Cu-Si master alloy Added to the vacuum induction quick-setting furnace;

[0053] Step 2. After all the substances in S1 are melted, add 0.05wt% La, 0.03wt% Eu, 0.1wt% Al, 0.06wt% In, 1.10wt% Ce and 0.04wt% Ga to the vacuum induction quick setting Mix and smelt together with the previous material in the furnace to obtain stripped alloy flakes;

[0054] Step 3: Break the stripped alloy flakes in a hydrogenation furnace first, then add a mixture of methyl acetate, polyethylene oxide monofatty acid ester and graphite, and then make fine powder in a jet mill, ...

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Abstract

A microwave sintered NdFeB magnet comprises 17.70wt% of Nd, 5.50wt% of Pr, 1.40wt% of Tb, 0.25wt% of Al, 0.10wt% of Cu, 1.00wt% of Co, 0.09wt% of Ga, 0.96wt% of B, 0.11wt% of Ag, 0.09wt% of Si, 0.07%of La, 0.06wt% of Eu, 0.08wt% of In, 1.31wt% of Zn, 0.92wt% of Sn, 1.20wt% of Ce and 1.83wt% of Zr with the balance being Fe and impurity which cannot be removed. The sintered NdFeB magnet has relatively high magnetic energy product and coercivity. Moreover, according to the preparation method, microwave is used for mainly heating, the temperature is lower than that of a traditional sintering modeduring the sintering process, meanwhile, the used time also can be greatly shortened, so that the integral economic benefit of the NdFeB magnet is improved.

Description

technical field [0001] The invention relates to the field of magnet manufacturing, in particular to a microwave sintered NdFeB magnet and a preparation method thereof. Background technique [0002] Permanent magnetic materials have been developed as key materials supporting electronic devices, and the development direction is toward the direction of high magnetic energy product and high coercive force. At present, rare earth magnets are widely used in many fields, such as recent walking robots with mechanical minds, special motors with integrated technology supported by rare earth NdFeB magnets, and automotive automatic systems have become new application fields. [0003] Due to the characteristics of NdFeB material, in the past technology, if the coercive force Hcj of the magnet is to be increased, the remanence Br of the magnet will be affected; if the remanence Br of the magnet is to be increased, the coercive force Hcj of the magnet will be affected Therefore, the magne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0266
Inventor 赵渭敏于博赵胤杰
Owner 宁波金轮磁材技术有限公司
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