Method for preparing rare earth permanent magnet through laser additive fast forming and sintering in hot isostatic pressing mode

A rare earth permanent magnet and hot isostatic pressing technology, applied in the field of materials, can solve the problems of rare earth resource waste, low yield of magnets, waste of materials, etc., achieve the effect of small magnetic field loss, shorten the preparation process, and improve magnetic properties

Active Publication Date: 2015-02-25
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sintered rough blanks are usually square and cylindrical. According to the requirements of the finished product, these magnets need to be post-processed, such as slicing, rounding, drilling, arc grinding, etc. The post-processing process will waste a lot of material and cause the magnet to become a material. The rate is very low, which is also a main reason for the high price of rare earth permanent magnet materials, and it also causes a lot of waste of rare earth resources; how to simplify the preparation process, and design the size and shape of the rough body according to the requirements of the finished product A new direction for magnets

Method used

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  • Method for preparing rare earth permanent magnet through laser additive fast forming and sintering in hot isostatic pressing mode
  • Method for preparing rare earth permanent magnet through laser additive fast forming and sintering in hot isostatic pressing mode
  • Method for preparing rare earth permanent magnet through laser additive fast forming and sintering in hot isostatic pressing mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Prepare Nd / Pr-Fe-B micropowder with a particle size of 80 μm as a raw material; the preparation method is: put the Nd / P-Fe-B coarse powder into a ball mill or a jet mill, and grind it into Nd / Pr-Fe-B Micropowder; the composition of the Nd / PrFeB coarse powder contains Nd 25%, Pr 10%, B 1% by weight percentage, and the balance is Fe; particle size is 0.1 ~ 3mm;

[0040] According to the requirements of product shape, size, magnet orientation, etc., the program is programmed on the control computer of the 3D printing equipment, and the 3D model of the product is obtained by inputting various size data of the product;

[0041] Install the substrate on the workbench of the CNC machine tool of the 3D printing equipment, turn on the laser irradiation switch of the 3D printing equipment, and adjust the laser power to control the size of the spot;

[0042] Put the Nd / Pr-Fe-B micropowder into the powder storage tank of the 3D printing equipment, turn on the powder feeding switch,...

Embodiment 2

[0051] The preparation method of RE-Fe-B rare earth permanent magnet is the same as embodiment 1, and difference is:

[0052] (1) Prepare Nd / Pr / Dy-Fe-B micropowder with a particle size of 100 μm as a raw material; the composition of Nd / Pr / Dy-Fe-B coarse powder used in the preparation of Nd / Pr / Dy-Fe-B micropowder is by weight percentage Contains 20% Nd, 8% Pr, 3% Dy, 0.9% B, and the balance is Fe; the particle size is 0.1~3mm;

[0053] (2) Apply a magnetic field with a strength of 1T perpendicular to the substrate through an electromagnet;

[0054] (3) Blow Nd / Pr / Dy-Fe-B micropowder into the feeding pipeline with high-pressure argon; the delivery rate of Nd / Pr / Dy-Fe-B micropowder is 10g / min;

[0055] (4) When the laser is irradiated onto the Nd / Pr / Dy-Fe-B micropowder on the substrate, the laser power is 900W, the scanning speed is 500 mm / min, the overlap rate is 20%, and the spot diameter is 0.5mm;

[0056] (5) The relative density of the rough magnet is 83%;

[0057] (6) Ho...

Embodiment 3

[0061] The preparation method of RE-Fe-B rare earth permanent magnet is the same as embodiment 1, and difference is:

[0062] (1) Prepare Nd / Pr / Dy-Fe-B fine powder with a particle size of 20 μm as raw material; the composition of Nd / Pr / Dy-Fe-B coarse powder used in the preparation of Nd / Pr / Dy-Fe-B fine powder is by weight percentage Contains Nd 22%, Pr 5%, Dy 4%, B 0.9%, the balance is Fe; particle size is 0.1~3mm;

[0063] (2) Apply a magnetic field with a strength of 1.5T perpendicular to the substrate through an electromagnet;

[0064] (3) The delivery rate of Nd / Pr / Dy-Fe-B fine powder is 15g / min;

[0065] (4) When the laser is irradiated onto the Nd / Pr / Dy-Fe-B micropowder on the substrate, the laser power is 1000W, the scanning speed is 450 mm / min, the overlap rate is 30%, and the spot diameter is 1mm;

[0066] (5) The relative density of the rough magnet is 84%;

[0067] (6) Hot isostatic pressing, the temperature is 1000°C, the pressure is 50 MPa, and the time is 150m...

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Abstract

The invention provides a method for preparing a rare earth permanent magnet through laser additive fast forming and sintering in a hot isostatic pressing mode, and belongs to the technical field of materials. The method comprises the following steps that (1), Nd/Pr/Dy-Fe-B micro powder is prepared; (2), programs are compiled in a control computer of a 3D printing device; (3), a base plate is installed on a work table, laser power is adjusted, and the spot size is controlled; (4), high-pressure nitrogen or argon is utilized for blowing the Nd/Pr/Dy-Fe-B micro powder into a feeding pipeline, and the conveying capacity is adjusted; (5), the Nd/Pr/Dy-Fe-B micro powder is sprayed on the base plate, an electromagnet is used for exerting a magnetic field, and laser is irradiated on the Nd/Pr/Dy-Fe-B micro powder on the base plate; scanning and sintering are sequentially carried out according to the programs to obtain a magnet rough blank; (6), the magnet rough blank is sintered in the hot isostatic pressing mode. A product obtained through the method can be directly used after the surface defects such as uneven surfaces and oxide skin are removed through polishing, and post-processing working procedures of slicing, polishing, wire-electrode cutting and the like are not needed.

Description

technical field [0001] The invention belongs to the field of material technology, in particular to a method for preparing rare earth permanent magnets by laser additive rapid prototyping and sintering hot isostatic pressing. Background technique [0002] With the development of modern science and technology and information industry in the direction of integration, miniaturization, ultra-miniaturization, lightweight, and intelligence, sintered rare earth permanent magnet materials with ultra-high magnetic energy density gradually occupy more and more important roles in these fields. It has effectively promoted the development of modern science and technology and the information industry, and provided a guarantee for new materials for the emergence of new industries. Sintered rare earth (RE-Fe-B) permanent magnet materials mainly refer to Nd / Pr / Dy-Fe-B materials. At present, the application fields of sintered rare earth (RE-Fe-B) permanent magnet materials mainly include new ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/053H01F1/08B22F3/105B22F3/14
CPCH01F1/0577H01F41/0253
Inventor 裴文利何长树李金国
Owner NORTHEASTERN UNIV
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