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A kind of preparation method of high-performance sintered re-fe-b system

A re-fe-b, re-fe-b-m technology, applied in the field of preparation of high-performance sintered Re-Fe-B series, can solve the problems of metal mold heating, affecting work efficiency and product quality, etc., to achieve easy control, The effect of avoiding local or corner oxidation and improving the degree of orientation

Active Publication Date: 2022-05-24
TIANJIN SANHUAN LUCKY NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnetic field orientation of sintered Re-Fe-B powder mainly includes constant magnetic field orientation and alternating pulse magnetic field orientation. The orientation degree of alternating pulse magnetic field orientation is greater than that of constant magnetic field orientation. Heat, affecting work efficiency and product quality

Method used

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  • A kind of preparation method of high-performance sintered re-fe-b system
  • A kind of preparation method of high-performance sintered re-fe-b system
  • A kind of preparation method of high-performance sintered re-fe-b system

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Effect test

Embodiment 1

[0032] The invention provides a preparation method of high-performance sintered Re-Fe-B system, which adopts a quick-setting process to make Re-Fe-B-M alloy quick-setting sheets, wherein; in addition, the pouring temperature and rotation speed of the smelting alloy quick-setting sheets should be suitable , the narrower the columnar crystal width distribution of the quick-setting sheet, the better, wherein Re is Nd, and M includes Ga, Cu, Co and Zr; the alloy quick-setting sheet is hydrogenated and air-milled to make a micropowder with an average particle size of 5.1 μm; The obtained micropowder was added with 1.2ml / Kg of lubricant and mixed evenly; it was oriented under the protection of N2 gas, and the sample obtained in the forward magnetic field +1.5T orientation (referred to as constant magnetic field orientation) was recorded as the 1# sample; the powder started to be positive Magnetic field +1.5T orientation, after the upper punch is pressed down for 0.2h, the upper punch...

Embodiment 2

[0045] The invention provides a preparation method of high-performance sintered Re-Fe-B system, which adopts a rapid-setting process to prepare a Re-Fe-B-M alloy rapid-setting sheet, wherein R is one of Nd, Pr, Dy or Tb M is selected from a variety of Cr, Co, Ni, Ga, Cu, Al, Zr, Nb, Ti; the alloy quick-setting sheet is hydrogenated and air-flow milled to make micropowders with different particle sizes, and the particle size is 3.0 um~5.5um, the jet mill adopts N2 medium or other inert gas medium; the obtained micropowder is added with 1.2ml / Kg lubricant and then mixed; it is oriented under the protection of N2 gas, and it adopts segmented magnetization orientation, and the powder begins to contact the positive direction. Magnetic field +1.5T orientation, after 0.2h of upper punching stroke, reverse magnetic field -0.4T orientation, stay for 3s, and then forward magnetic field +1.5T, press into green compacts (h refers to the position where the upper punch contacts the powder to...

Embodiment 3

[0061] The present invention provides a preparation method of high-performance sintered Re-Fe-B system. The samples 19#, 21#, 22# and 23# in Example 2 are cut to a thickness of 3um in the direction of magnetization, and polished on six sides. , cleaned, and after Tb was expanded under certain conditions, the corresponding samples were recorded as 25# to 28#.

[0062] Table 7: Properties of some of the above samples after diffusion

[0063]

[0064] The Hcj of the samples in Example 2 are all below 15KOe. In order to improve the Hcj, some samples were subjected to Tb expansion treatment. After the diffusion, the Hcj of the samples increased significantly, and the increase was about: 10.45-12.82KOe, Br slightly decreased, 28# sample The Br can reach 15.04KGs while the Hcj can reach 18.24KOe, and the sum of BHm and Hcj of the 25# sample can reach 76.28.

[0065] The invention provides a preparation method of high-performance sintered Re-Fe-B system with Br greater than 14.5KG...

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Abstract

The present invention relates to the technical field of permanent magnet materials, in particular to a preparation method of high-performance sintered Re-Fe-B system. The present invention adopts the mode of segmented magnetic field orientation automatic pressing, which can obviously improve the degree of orientation, thereby increasing Br, without Isostatic pressing, easy to control the oxygen content, will not cause the metal mold to heat significantly, can realize continuous mass production, and because the Hcj of the magnet with high Br is low, the Hcj can be significantly improved by adopting the diffusion process, and the Br is basically not reduced at the same time. The preparation of the present invention In the method, the whole process of zero oxygen control after milling and before furnace loading and sintering can effectively avoid partial or corner oxidation of the blank.

Description

technical field [0001] The invention relates to the technical field of permanent magnet materials, in particular to a preparation method of a high-performance sintered Re-Fe-B system. Background technique [0002] At present, sintered Nd-Fe-B is a large-scale commercialized permanent magnet with the highest energy density discovered so far. Since its discovery, it has been widely used in many fields such as computer hard disks, hybrid vehicles, medical care, wind power generation, etc., and its application scope and output are increasing year by year, especially in the field of new energy vehicles. [0003] In recent years, the research and development of sintered Re-Fe-B magnets is mainly divided into two directions: one is high performance; the other is low cost. With the application of sintered Re-Fe-B magnets in low-carbon economic fields such as wind power generation, new energy vehicles, and energy-saving home appliances, sintered Re-Fe-B magnets with high magnetic en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F41/0266H01F41/0293H01F1/0573H01F1/0576H01F1/0577
Inventor 曹利军李志学李绍芳李小明程言志杨慧杰王浩颉韩雪
Owner TIANJIN SANHUAN LUCKY NEW MATERIAL CO LTD
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