A high coercive force, high energy product sintered NdFeB permanent magnet material and its preparation method

A technology with high magnetic energy product and high coercive force, which is applied in the fields of magnetic materials, inductor/transformer/magnet manufacturing, magnetic objects, etc., can solve the problem of not being able to obtain advantages, not exerting the synergistic effect of light rare earth and heavy rare earth, and deviation of actual composition, etc. Problems, to achieve the effect of increasing the number of mixing and mixing uniformity, enhancing the reliability and practicability of technology, and overcoming coercive force and magnetic energy product

Active Publication Date: 2022-06-07
GANZHOU FORTUNE ELECTRONICS
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Problems solved by technology

Due to the limitations of the two main constituent alloys containing mixed rare earth NdFeB and non-mixed rare earth NdFeB in the design of the scheme, it is not suitable for solving the performance problems of other types of NdFeB other than this category.
In addition, this method also has the following problems: ① The three alloys are limited to cast strips, which are not suitable for alloys made by other methods, and the advantages of alloys made by other methods cannot be obtained; ② Auxiliary alloys Only for NdH 2 +PrCu can provide a low melting point substance to a certain extent, thereby improving the structure of the grain boundary phase, but its ability to increase the coercive force is limited, and it is difficult to obtain a magnet with low recovery permeability, which is not suitable for high energy product magnets. Preparation; ③ Mixing in the powder stage, it is relatively difficult to achieve a more uniform mixing, and industrial applications must rely on better equipment to ensure that the powder does not oxidize and spontaneously ignite, posing a safety hazard; ④ Not based on actual ingredients The second ratio design, the actual composition may deviate
Problems with this method: ① It also limits the alloy to cast strips, which is not suitable for alloys made by other methods, and cannot obtain the advantages of alloys made by other methods; ② There is only one main alloy , unable to give full play to the synergistic advantages of the dual main phase; ③R in RTM is only one or more of the heavy rare earth elements, and does not exert the synergistic effect of light rare earth and heavy rare earth; ④There is no secondary ratio design based on the actual composition, Actual composition may vary
This method can improve the performance of NdFeB magnets to a certain extent, but it does not play a key role in the preparation of "double high" NdFeB permanent magnet materials

Method used

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  • A high coercive force, high energy product sintered NdFeB permanent magnet material and its preparation method
  • A high coercive force, high energy product sintered NdFeB permanent magnet material and its preparation method
  • A high coercive force, high energy product sintered NdFeB permanent magnet material and its preparation method

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Experimental program
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Embodiment 1

[0045] The design composition of the main alloy A is (Pr 0.25 Nd 0.75 ) 29 Fe 68.8 Co 1 Cu 0.1 Ga 0.2 B 0.9 (mass ratio), the design composition of the main alloy B is (Pr 0.25 Nd 0.75 ) 29 Dy 1 Fe 67.75 Co 1 Cu 0.1 Ga 0.15 B 1 (mass ratio), alloy flakes of 0.2~0.4mm are respectively made by batching, vacuum smelting and rapid-setting stripping; the design composition of auxiliary alloy C is (Pr 0.25 Nd 0.75 ) 50 Dy 30 Al 10 Zr 3 Nb 7 (mass ratio), alloy ingots are made by batching and vacuum smelting. The three alloys were sampled and tested to analyze their compositions. According to the analysis results, they were mixed in a ratio of A:B:C=65:34:1, and then loaded into a hydrogen crushing furnace to absorb hydrogen. Two rounds of "hydrogen absorption-dehydrogenation" process were adopted. Coarse powder is made, that is, firstly, under the hydrogen partial pressure of 0.15MPa, rotary hydrogen absorption is carried out for 0.5-1h, and the dehydrogenation...

Embodiment 2

[0047] The design composition of the main alloy A is (Pr 0.25 Nd 0.75 ) 29 Fe 68.8 Co 1 Cu 0.1 Ga 0.2 B 0.9 (mass ratio), the design composition of the main alloy B is (Pr 0.25 Nd 0.75 ) 29 Dy 1 Fe 67.75 Co 1 Cu 0.1 Ga 0.15 B 1 (mass ratio), alloy flakes of 0.2~0.4mm are respectively made by batching, vacuum smelting and rapid-setting stripping; the design composition of auxiliary alloy C is (Pr 0.25 Nd 0.75 ) 60 Dy 30 Al 10 (mass ratio), the design composition of auxiliary alloy D is Zr 30 Nb 70 (mass ratio), alloy ingots are made by batching and vacuum smelting. The four alloys were sampled and tested to analyze their compositions. According to the analysis results, they were mixed according to the ratio of A:B:C:D=65:34:0.9:0.1, put into a hydrogen crushing furnace to absorb hydrogen, and two rounds of "hydrogen absorption- Coarse powder is made by dehydrogenation process, that is, firstly, under the hydrogen partial pressure of 0.15MPa, rotate hydroge...

Embodiment 3

[0049] The design composition of the main alloy A is (Pr 0.25 Nd 0.75 ) 29 Fe 68.8 Co 1 Cu 0.1 Ga 0.2 B 0.9 (mass ratio), the design composition of the main alloy B1 is (Pr0.25 Nd 0.75 ) 29 Dy 0.7 Fe 68.05 Co 1 Cu 0.1 Ga 0.15 B 1 (mass ratio), the design composition of the main alloy B2 is (Pr 0.25 Nd 0.75 ) 29 Dy 1.5 Fe 67.25 Co 1 Cu 0.1 Ga 0.15 B 1 (mass ratio), alloy flakes of 0.2~0.4mm are respectively made by batching, vacuum smelting and rapid-setting stripping; the design composition of auxiliary alloy C is (Pr 0.25 Nd 0.75 ) 50 Dy 30 Al 10 Zr 3 Nb 7 (mass ratio), alloy ingots are made by batching and vacuum smelting. The four alloys were sampled and tested to analyze their compositions. According to the analysis results, they were mixed in the ratio of A:B1:B2:C=65:22:12:1, and then put into a hydrogen crushing furnace to absorb hydrogen. Two rounds of "hydrogen absorption- Coarse powder is made by dehydrogenation process, that is, firstly...

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Abstract

The present invention provides a high coercive force, high energy product sintered NdFeB permanent magnet material and its preparation method, comprising a main alloy and at least one auxiliary alloy, the main alloy including at least one RE biased towards high energy product design 2 (Fe,M) 14 B master alloy A of intermetallic compound and at least one RE biased towards high coercivity design 2 (Fe,M) 14 The main alloy B of B intermetallic compound, the auxiliary alloy is a grain boundary phase substance, and the main alloy and the auxiliary alloy are mixed in a solid state. Before mixing, the main alloy is first made into alloy flakes, and the auxiliary alloy is made into Alloys in the form of flakes, blocks or larger particles. The invention discloses a high coercive force, high energy product sintered NdFeB permanent magnet material and its preparation method, which provides a process and technology for mass production of high coercive force and high energy product "double high" sintered NdFeB permanent magnet materials Technical Support.

Description

technical field [0001] The invention relates to the technical field of manufacture of sintered NdFeB permanent magnet materials, in particular to a high coercivity, high magnetic energy product sintered NdFeB permanent magnet material and a preparation method. Background technique [0002] Sintered NdFeB permanent magnet material is a strategic new functional rare earth material developed by the country. It has the advantages of small size, high magnetic energy density, strong anti-demagnetization interference ability, etc. It is widely used in new energy, electronic communication, artificial intelligence, rail transit, Aerospace and defense industry and other fields, and still continue to grow at a rate of 5%-10% every year. In 2019, the actual national output reached about 170,000 tons. [0003] From the application side, it is known that the NdFeB magnet application design pays more attention to the size of the magnetic flux, magnetic moment and surface magnetic inductio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/10C22C38/16C22C33/02C22C33/06B22D11/06B22F1/145B22F9/04B22F3/02B22F3/04B22F3/10B22F3/24H01F1/057H01F41/00
CPCB22F1/0003C22C38/005C22C38/10C22C38/002C22C38/16C22C33/02C22C33/06B22D11/0611B22F9/023B22F9/04B22F3/02B22F3/04B22F3/1007B22F3/24H01F1/0573H01F1/0576H01F1/0577H01F41/00B22F2202/05B22F2998/00B22F2003/248B22F2201/20B22F1/145
Inventor 戚植奇刘滨袁维仁钟艺陈剑威庞再升喻玺
Owner GANZHOU FORTUNE ELECTRONICS
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