Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for preparing sintered NdFeB magnets by 3D cold printing

A neodymium-iron-boron, 3D technology, applied in the field of powder metallurgy, can solve the problems of inapplicability, excessive grain size, and reduced magnetic properties of magnets, and achieve the effects of saving resources, improving density, and good magnetic properties

Active Publication Date: 2020-03-31
UNIV OF SCI & TECH BEIJING
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For sintered NdFeB magnets, the particle size of the powder is generally 3-8μm, if the grain size is too large, the magnetic properties of the magnet will be greatly reduced
Therefore, high energy beam sintering rapid prototyping technology is not suitable for the preparation of sintered NdFeB magnets

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0027] A method for preparing U-shaped sintered NdFeB magnets by 3D cold printing:

[0028] (1) Dissolve polystyrene in dichloromethane to a solution concentration of 0.5 g / ml, stir evenly, and prepare an organic matter coating solution. Measure 10ml of coating solution, and weigh 500g of 5μm NdFeB powder, mix the organic coating solution and NdFeB powder evenly, so that the solution soaks all the powder;

[0029] (2) Put the coated powder into a vacuum drying oven and dry it at 45°C for 60 minutes, then take it out to obtain NdFeB powder coated with organic matter;

[0030] (3) Dissolve 1 g of gelling factor and 2 g of rosin in 100 g of toluene, and stir continuously at 60° C. until completely dissolved to prepare a premix. Put the coated NdFeB powder into the premix solution with a solid content of 60vol.%, and add 0.08vol.% oleic acid, stir evenly, and prepare a printing paste;

[0031] (4) Input the U-shaped model into the 3D cold printer, and put the printing paste into...

Embodiment example 2

[0034] A method for preparing annular sintered NdFeB magnets by 3D cold printing:

[0035] (1) Dissolve liquid paraffin and polystyrene in chloroform to a solution concentration of 0.08g / ml, stir evenly, and prepare an organic matter coating solution. Measure 75ml of coating solution, and weigh 400g of 8μm NdFeB powder, mix the organic coating solution and NdFeB powder evenly, so that the solution soaks all the powder;

[0036] (2) Put the coated powder into a vacuum drying oven and dry it at 55°C for 30 minutes, then take it out to obtain NdFeB powder coated with organic matter;

[0037](3) Dissolve 0.8g of gelatin factor and 1.5g of rosin in 100g of toluene, and keep stirring at 80°C until completely dissolved to prepare a premix. Put the coated NdFeB powder into the premix solution with a solid content of 55vol.%, add 0.2vol.% oleic acid, stir evenly, and prepare a printing paste;

[0038] (4) Input the ring-shaped model into the 3D cold printer, and put the printing slur...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides a method for preparing sintered NdFeB magnets by 3D cold printing, which belongs to the field of powder metallurgy. By coating the surface of NdFeB magnetic powder with a layer of oxygen-free organic film to prevent the oxidation of the magnetic powder during the 3D cold printing process, at the same time, a low molecular weight and low oxygen gel system is used to prepare printing paste, and magnetization is realized by magnetization. Print orientation molding, cold isostatic pressing, sintering, and finally get sintered NdFeB parts with complex shapes. Oxygen-free organic matter is used to coat the surface of easily oxidized NdFeB magnetic powder to control the oxidation of the magnetic powder during the forming process, and a low-molecular-weight and low-oxygen gel system is used to prepare 3D cold-printed NdFeB slurry, further Oxygenation of the magnet during the control forming process. The sintered NdFeB magnet prepared by the invention has good magnetic properties, and can realize near-net shape of various complex shapes, saves the cutting process of the complex parts of the magnet, greatly reduces the production cost and saves resources.

Description

technical field [0001] The invention belongs to the field of powder metallurgy and provides a method for preparing sintered NdFeB magnets by 3D cold printing. Background technique [0002] Sintered NdFeB permanent magnet material is called "Magnetic King" because of its high energy density. It has become a core functional device in the fields of aerospace, biomedicine, information communication, household appliances, wind power generation and automobile industry. Among them, heavy rare earth Dy or Tb is an element commonly used in high-performance sintered NdFeB magnets. However, heavy rare earth Dy and Tb elements are scarce and expensive. Sintered NdFeB magnets are usually prepared by powder pressing and sintering processes, but in order to obtain parts with ideal shapes, a certain amount of machining is usually required on the sintered magnets, which causes a lot of waste of resources and increases production costs. Therefore, it is necessary to develop a technology tha...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F3/04B22F3/10B22F3/22H01F1/057B33Y10/00B33Y70/00
CPCH01F1/0577B22F3/04B22F3/1007B22F3/22B33Y10/00B33Y70/00B22F1/16H01F41/0253
Inventor 杨芳林圣增秦乾郭志猛隋延力周洋陈存广路新邵艳茹孙海霞张策芦博昕闫梦婕冯钊红
Owner UNIV OF SCI & TECH BEIJING