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Neodymium-iron-boron permanent magnet and preparation method and application thereof

A technology of permanent magnets and NdFeB, which is applied in the fields of magnetic objects, inductors/transformers/magnets, magnetic materials, etc., and can solve the problems of unclear organizational structure, formula and performance correspondence, and little practical application significance

Active Publication Date: 2020-11-20
YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no evidence that there are achievements that can be applied to high Br and high Hcj products, and the practical application is of little significance
Moreover, there is no clear result on the correspondence between organizational structure, formula and performance

Method used

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  • Neodymium-iron-boron permanent magnet and preparation method and application thereof
  • Neodymium-iron-boron permanent magnet and preparation method and application thereof
  • Neodymium-iron-boron permanent magnet and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] (1) Ingredients: Prepare various raw materials required in this embodiment, the atomic percentage of the raw materials is 11.1% Nd, 2.9% Pr, 0.2% Dy, 2.24% Co, 0.37% Al, 0.16% Cu, 0.19% Ga, 0.12 Zr%, 5.55% B, and the rest are iron and unavoidable impurities. The formulation composition is shown in Table 1.

[0107] (2) The raw material is high-frequency melted in an Ar atmosphere, and poured onto a quenching roll to make an alloy quick-setting sheet with a thickness of 0.15-0.40mm.

[0108] (3) The alloy is hydrogenated and pulverized, and then jet milled to obtain a magnetic powder with a particle size of SMD=2.8 μm, X10=1.28 μm, and X100=18 μm.

[0109] (4) Add the above-mentioned jet mill powder to 0.2wt% of the lubricant as the raw material, then mix the mixture, and shape it in an orientation field environment with a magnetic field strength of 2T.

[0110] (5) Put the green body into the vacuum sintering furnace, after heat preservation at 1070°C for 4 hours, coo...

Embodiment 2

[0126] (1) Batching: prepare various raw materials needed in this embodiment, and the atomic percentage composition of the batching is shown in Table 3.

[0127] (2) The raw material is high-frequency melted in an Ar atmosphere, and poured onto a quenching roll to make an alloy quick-setting sheet with a thickness of 0.15-0.40mm.

[0128] (3) The alloy is hydrogenated and pulverized, and then jet milled to obtain a magnetic powder with a particle size of SMD=2.7 μm, X10=1.23 μm, and X100=15 μm.

[0129] (4) Add the above-mentioned jet mill powder to 0.3wt% of the lubricant as the raw material, mix the mixture, and shape it in an orientation field environment with a magnetic field strength of 2T.

[0130] (5) Put the green body into a vacuum sintering furnace, after heat preservation at 1075°C for 4 hours, cool to room temperature at a rate of 10°C / min, heat up to 800°C for 3 hours, and then proceed at a speed of 6°C / min Cool to room temperature, then heat up to 580°C for 4 ho...

Embodiment 3

[0143] (1) Ingredients: prepare various raw materials required for this embodiment, and the formula composition is shown in Table 5.

[0144] (2) The raw material is high-frequency melted in an Ar atmosphere, and poured onto a quenching roll to make an alloy quick-setting sheet with a thickness of 0.15-0.40 mm.

[0145] (3) The alloy is hydrogenated and pulverized, and then jet milled to obtain a magnetic powder with a particle size of SMD=2.9 μm, X10=1.28 μm, and X100=18 μm.

[0146] (4) Add the above-mentioned jet mill powder to 0.3wt% of the lubricant as the raw material, mix the mixture, and shape it in an orientation field environment with a magnetic field strength of 2T.

[0147] (5) Put the green body into a vacuum sintering furnace, after heat preservation at 1060°C for 4 hours, cool to room temperature at a rate of 10°C / min, heat up to 800°C for 3 hours, and then proceed at a speed of 6°C / min Cool to room temperature, then heat up to 560°C for 4 hours, then cool to r...

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Abstract

The invention discloses a neodymium iron boron permanent magnet and a preparation method and application thereof. The grain boundary phase and the main phase of the neodymium iron boron permanent magnet have the following structure distribution: the total length of the grain boundary phase in the measurement range is recorded as Lm, the total length of the grain boundary phase with the grain boundary width of more than or equal to 1 [mu] m in the measurement range is recorded as Ln, and Lm and Ln satisfy the relationship of 0.40 < = Ln / Lm < = 1; in the measurement range, the total length of grain boundary phases with the width between adjacent grain boundaries being larger than or equal to 2 microns is recorded as Lx and Lm, and Lx meets the relation that Lx / Lm is larger than or equal to 0and smaller than or equal to 0.2; the total length of the grain boundary phase scanned by the EPMA line in the measurement range is recorded as Le, the total length of the grain boundary phase scanned by the EPMA line in the measurement range is recorded as LM, and Le and LM meet the relationship of 0.40 < = Le / LM < 1. The high-temperature demagnetization-resistant magnet with high Br, high Hcj,high square degree, specific grain boundary phase and main phase structure is prepared.

Description

technical field [0001] The invention belongs to the field of neodymium-iron-boron magnets, and in particular relates to a neodymium-iron-boron permanent magnet, a preparation method and an application thereof. Background technique [0002] Sintered NdFeB magnets are widely used in automotive motors, wind power, traction machines, compressors, and consumer electronics because of their excellent magnetic properties, especially Br and Hcj. With the development of motors, the performance requirements of sintered NdFeB magnets are getting higher and higher, especially magnets with high Br, high Hcj and higher squareness under operating temperature have become the demand trend of new high-performance motors. [0003] There are many factors affecting the performance of NdFeB, and the principle is also very complicated. Structurally speaking, the sintered NdFeB magnet is composed of the main phase Nd2Fe14B and the grain boundary phase composed of Nd-rich phase and B-rich phase. Th...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0266
Inventor 于永江王鹏飞王聪刘磊魏蕊
Owner YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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