Preparation method of rare earth complex crystal boundary modification sintered neodymium-iron-boron magnetic body

Abstract

The invention discloses a preparation method of a rare earth complex crystal boundary modification sintered neodymium-iron-boron magnetic body. The preparation method comprises the following steps of: preparing neodymium-iron-boron alloy particles, smashing the neodymium-iron-boron alloy particles into powder and injecting an antioxidant; ejecting mixed liquid of a rare earth complex and petroleum into neodymium-iron-boron powder in a spraying manner and mixing uniformly; and pressing the mixture into a blank magnetic body in magnetic aligning and sintering. In the preparation method, the mixture of the rare earth complex and the petroleum is added in the spraying manner, so that contact of the particles with oxygen can be effectively prevented, the oxygen absorption in the magnetic body preparing process is lowered, and the magnetic performance of the sintered magnetic body is enhanced. The rare earth complex is added and a rare earth product left by the decomposition of the sinteredrare earth complex is mainly positioned at a crystal boundary, so that the prepared sintered neodymium-iron-boron magnetic body has a higher coercive force value and a lower temperature coefficient compared with the conventional sintered neodymium-iron-boron magnetic body. Moreover, the preparation method has a simple process, is easy to operate, and is suitable for batch production.

Description

technical field

[0001] The invention relates to a preparation method of a sintered NdFeB magnet, in particular to a preparation method of a rare earth complex grain boundary modified sintered NdFeB magnet, belonging to the technical field of magnetic materials. Background technique

[0002] Rare earth permanent magnet materials are the most magnetic permanent magnets in contemporary times. Because of their high remanence, high coercive force and high magnetic energy product, and good dynamic recovery characteristics, this type of material has excellent Magnetic properties have attracted the attention of the magnetic material industry, and have been widely used in the fields of national defense, home appliances, motors and information industries. At the same time, with the development of technology in the application field, the demand for high-performance permanent magnet materials is increasing day by day. In particular, such materials are required to have the characteristic...

Examples

Embodiment 1

[0022] Preparation of brand 33UH NdFeB magnets by sintering method

[0023] 1) Casting sheet: NdFeB quick-setting sheet is prepared by conventional quick-setting casting process, and then the NdFeB quick-setting sheet is broken into 1-10 micron NdFeB alloy particles by hydrogen explosion method;

[0024] 2) Powder making: While further crushing the NdFeB alloy particles treated by the hydrogen explosion process to make powder, inject the mixture of borate and polyethylene oxide monofatty acid ester in a pouring manner, borate and poly The volume ratio of ethylene oxide monofatty acid ester is 1:1, and the mixture of boric acid ester and polyethylene oxide monofatty acid ester accounts for 0.01% of the total weight of NdFeB powder;

[0025] 3) Mixing: The rare earth lanthanide porous polymer [(Pr, Nd) 2 (PDA) 3 (H 2 O)]·2H 2 The mixed liquid of 0 and gasoline is injected into the NdFeB powder, and the rare earth lanthanide porous polymer [(Pr, Nd) 2 (PDA) 3 (H 2 O)]·2H ...

Embodiment 2

[0035] Preparation of brand 40SH-P NdFeB magnets by sintering method

[0036] 1) Casting sheet: NdFeB quick-setting sheet is prepared by conventional quick-setting casting process, and then the NdFeB quick-setting sheet is broken into 1-10 micron NdFeB alloy particles by hydrogen explosion method;

[0037] 2) Powder making: While further crushing the NdFeB alloy particles treated by the hydrogen explosion process to make powder, inject the mixture of borate and polyethylene oxide monofatty acid ester in a pouring manner, borate and poly The volume ratio of ethylene oxide monofatty acid ester is 1:1.2, and the mixture of borate ester and polyethylene oxide monofatty acid ester accounts for 0.5% of the total weight of NdFeB powder;

[0038] 3) Mixing: The rare earth lanthanide porous polymer [(Pr, Nd) 2 (PDA) 3 (H 2 O)]·2H 2 The mixed liquid of 0 and gasoline is injected into the NdFeB powder, and the rare earth lanthanide porous polymer [(Pr, Nd) 2 (PDA) 3 (H 2 O)]·2H 2...

Embodiment 3

[0048] Preparation of brand 38M NdFeB magnets by sintering method

[0049] 1) Casting sheet: NdFeB quick-setting sheet is prepared by conventional quick-setting casting process, and then the NdFeB quick-setting sheet is broken into 1-10 micron NdFeB alloy particles by hydrogen explosion method;

[0050] 2) Powder making: While further crushing the NdFeB alloy particles treated by the hydrogen explosion process to make powder, inject the mixture of borate and polyethylene oxide allyl ether in a pouring manner, borate and The volume ratio of polyethylene oxide allyl ether is 1:2, and the mixture of borate ester and polyethylene oxide allyl ether accounts for 0.8% of the total weight of NdFeB powder;

[0051] 3) Mixing: [Tb(2,5-pdc)(OH)(H 2 O) 2 ]·H 2 O and DyCl 3 The rare earth mixture and gasoline are mixed and injected into the NdFeB powder, [Tb(2,5-pdc)(OH)(H 2 O) 2 ]·H 2 O accounts for 1.5% of the total NdFeB powder, DyCl 3 It accounts for 1% of the total amount of N...

technical field

[0001] The invention relates to a preparation method of a sintered NdFeB magnet, in particular to a preparation method of a rare earth complex grain boundary modified sintered NdFeB magnet, belonging to the technical field of magnetic materials. Background technique

[0002] Rare earth permanent magnet materials are the most magnetic permanent magnets in contemporary times. Because of their high remanence, high coercive force and high magnetic energy product, and good dynamic recovery characteristics, this type of material has excellent Magnetic properties have attracted the attention of the magnetic material industry, and have been widely used in the fields of national defense, home appliances, motors and information industries. At the same time, with the development of technology in the application field, the demand for high-performance permanent magnet materials is increasing day by day. In particular, such materials are required to have the characteristic...

Examples

Embodiment 1

[0022] Preparation of brand 33UH NdFeB magnets by sintering method

[0023] 1) Casting sheet: NdFeB quick-setting sheet is prepared by conventional quick-setting casting process, and then the NdFeB quick-setting sheet is broken into 1-10 micron NdFeB alloy particles by hydrogen explosion method;

[0024] 2) Powder making: While further crushing the NdFeB alloy particles treated by the hydrogen explosion process to make powder, inject the mixture of borate and polyethylene oxide monofatty acid ester in a pouring manner, borate and poly The volume ratio of ethylene oxide monofatty acid ester is 1:1, and the mixture of boric acid ester and polyethylene oxide monofatty acid ester accounts for 0.01% of the total weight of NdFeB powder;

[0025] 3) Mixing: The rare earth lanthanide porous polymer [(Pr, Nd) 2 (PDA) 3 (H 2 O)]·2H 2 The mixed liquid of 0 and gasoline is injected into the NdFeB powder, and the rare earth lanthanide porous polymer [(Pr, Nd) 2 (PDA) 3 (H 2 O)]·2H ...

Embodiment 2

[0035] Preparation of brand 40SH-P NdFeB magnets by sintering method

[0036] 1) Casting sheet: NdFeB quick-setting sheet is prepared by conventional quick-setting casting process, and then the NdFeB quick-setting sheet is broken into 1-10 micron NdFeB alloy particles by hydrogen explosion method;

[0037] 2) Powder making: While further crushing the NdFeB alloy particles treated by the hydrogen explosion process to make powder, inject the mixture of borate and polyethylene oxide monofatty acid ester in a pouring manner, borate and poly The volume ratio of ethylene oxide monofatty acid ester is 1:1.2, and the mixture of borate ester and polyethylene oxide monofatty acid ester accounts for 0.5% of the total weight of NdFeB powder;

[0038] 3) Mixing: The rare earth lanthanide porous polymer [(Pr, Nd) 2 (PDA) 3 (H 2 O)]·2H 2 The mixed liquid of 0 and gasoline is injected into the NdFeB powder, and the rare earth lanthanide porous polymer [(Pr, Nd) 2 (PDA) 3 (H 2 O)]·2H 2...

Embodiment 3

[0048] Preparation of brand 38M NdFeB magnets by sintering method

[0049] 1) Casting sheet: NdFeB quick-setting sheet is prepared by conventional quick-setting casting process, and then the NdFeB quick-setting sheet is broken into 1-10 micron NdFeB alloy particles by hydrogen explosion method;

[0050] 2) Powder making: While further crushing the NdFeB alloy particles treated by the hydrogen explosion process to make powder, inject the mixture of borate and polyethylene oxide allyl ether in a pouring manner, borate and The volume ratio of polyethylene oxide allyl ether is 1:2, and the mixture of borate ester and polyethylene oxide allyl ether accounts for 0.8% of the total weight of NdFeB powder;

[0051] 3) Mixing: [Tb(2,5-pdc)(OH)(H 2 O) 2 ]·H 2 O and DyCl 3 The rare earth mixture and gasoline are mixed and injected into the NdFeB powder, [Tb(2,5-pdc)(OH)(H 2 O) 2 ]·H 2 O accounts for 1.5% of the total NdFeB powder, DyCl 3 It accounts for 1% of the total amount of N...

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