Sintered body, sintered permanent magnet and preparation method thereof

A technology of sintered body and permanent magnet, which is used in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., can solve the problems of difficult control, complicated manufacturing methods and processes, and achieve the effect of improving diffusion efficiency

Active Publication Date: 2019-11-12
BAOTOU TIANHE MAGNETICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The manufacturing method is complex and difficult to control

Method used

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  • Sintered body, sintered permanent magnet and preparation method thereof
  • Sintered body, sintered permanent magnet and preparation method thereof
  • Sintered body, sintered permanent magnet and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0081]

[0082] The preparation method of the sintered body comprises the following steps: (a) smelting raw materials of the sintered body to obtain master alloy flakes; (b) making the master alloy flakes into magnetic powder; (c) pressing the magnetic powder in a magnetic field, and then isostatic pressing (d) After the green body is subjected to the first vacuum heat treatment, the second vacuum heat treatment and the third vacuum heat treatment, a sintered body is obtained.

[0083] The sintered body prepared by the above method has Nd 2 Fe 14 The main phase of the B crystal phase and the grain boundary phase of the rare earth-rich phase. The raw materials of the sintered body are prepared according to the following relational formula: R a B b Ga c Cu d Al e m f co g Fe 余量 . The above-mentioned elements and atomic percentages are as described above, and will not be repeated here. The preparation process will inevitably introduce a small amount of oxygen, nitrog...

Embodiment 1～13

[0135] (1) Preparation of sintered body:

[0136] Prepare raw materials according to the formula in Table 1, and the formula meets the following condition A:

[0137] R a B b Ga c Cu d Al e m f co g Fe 余量 ; R contains at least one of Nd and Pr, and the ratio of La+Ce < 1.0at%, M contains at least one of Zr, Ti and Nb, a, b, c, d, e, f, g represent based on The atomic percentage of each element of all elements in the sintered body.

[0138] The sintered body is made by the following steps:

[0139] Smelting: Smelting the raw materials separately, so that the smelted raw materials are made into master alloy flakes, and the thickness of the master alloy flakes is 0.278mm;

[0140] Powder making: crush master alloy flakes into magnetic particles, and then grind the magnetic particles into magnetic powder (D50 is 3.8 μm, D90 / D10 is 3.8);

[0141] Molding: The magnetic powder is pressed to a density of 4g / cm under the action of an orientation magnetic field with a magneti...

Embodiment 14～16

[0161] The difference between Examples 14-16 and Example 6 is that: the sintered bodies obtained in the vacuum heat treatment step were cut into sintered bodies with thicknesses of 2 mm, 6 mm, and 8 mm, respectively. All the other conditions are the same as in Example 6. Specific steps are as follows:

[0162] (1) Preparation of sintered body:

[0163] Prepare raw materials by the formula (embodiment 6) of table 1. The sintered body is made by the following steps:

[0164] Smelting: Smelting the raw materials separately, so that the smelted raw materials are made into master alloy flakes, and the thickness of the master alloy flakes is 0.278mm;

[0165] Powder making: crush master alloy flakes into magnetic particles, and then grind the magnetic particles into magnetic powder (D50 is 3.8 μm, D90 / D10 is 3.8);

[0166] Molding: The magnetic powder is pressed to a density of 4g / cm under the action of an orientation magnetic field with a magnetic field strength of 2.0T 3 the ...

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Abstract

The invention discloses a sintered body, a sintered permanent magnet and a preparation method thereof. The sintered body of the present invention comprises a main phase of a Nd2Fe14B crystal phase anda grain boundary phase of a rare earth-rich phase, and comprises components Ra, Bb, Gac, Cud, Ale, Mf, Cog, with the balance of Fe, wherein R is selected from at least one rare earth element and mustcontain Nd; M is selected from at least one of Zr, Ti and Nb; a is 13 to 15.3%; b is 5.4 to 5.8%; c is 0.05 to 0.25%; d is 0.08 to 0.3%; e is 0 to 1.2%; f is 0.08 to 0.2%; g is 0.8 to 2.5%; the average grain size of Nd2Fe14B crystal phase is L from 4 to 8 [mu]m, the average thickness of the grain boundary phase is t with a unit of [mu]m; t and L satisfy the following relationship: [sigma]=t / L; and sigma is 0.009-0.012. The sintered body improves the diffusion efficiency of the heavy rare earth element RH.

Description

technical field [0001] The invention relates to a sintered body and a preparation method thereof, and also relates to a sintered permanent magnet and a preparation method thereof. Background technique [0002] Currently, with R 2 Fe 14 The R-Fe-B sintered body with B as the main phase has the highest performance among permanent magnets, and has been widely used in electric vehicle (EV, HV, PHV, etc.) motors, industrial motors, air-conditioning compressors, etc. The above-mentioned electric motor requires the magnet to still have relatively high coercive force Hcj and remanent magnetism Br in a high-temperature environment. [0003] The R-Fe-B sintered body prepared by traditional preparation method has high magnetic energy product BH and high coercive force Hcj. Will R 2 Fe 14 Part of R in B is replaced with heavy rare earth element RH, which can further increase the coercive force. In the R-Fe-B sintered body, adding a large amount of heavy rare earth element RH will ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F41/0293H01F41/0266H01F1/0577
Inventor 白锁吴树杰董义武志敏张帅袁擘袁易陈雅袁文杰
Owner BAOTOU TIANHE MAGNETICS TECH CO LTD
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