A preparation method of sintered rare earth iron boron permanent magnet material with controlled grain boundary

A permanent magnet material, rare earth iron boron technology, applied in the direction of magnetic materials, inductors/transformers/magnet manufacturing, magnetic objects, etc., can solve the problem of reducing remanence, magnet coercive force and force improvement limited, grain boundary composition or structure Influence and regulation are limited, to achieve the effect of increasing the adsorption strength, reducing the distribution range, and eliminating the possibility of oxidation
CN111029074BActive Publication Date: 2022-05-17JIANGXI NORMAL UNIV
11 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JIANGXI NORMAL UNIV
Publication Date
2022-05-17

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention provides a preparation method of a sintered rare earth iron boron permanent magnet material which regulates grain boundaries, and belongs to the field of magnetic materials. The main steps of the method are as follows: 1. Utilize the conventional method of sintering NdFeB to prepare magnetic powder, and the doping metal is not added at this stage; 2. Prepare metal fine powder (nano powder or micron powder) doped with metal (or alloy); 3. Under an inert atmosphere, use metal fine powder and volatile organic solvent to prepare a suspension, add magnetic powder to this solution, immerse, stir, stand still, vacuumize and evaporate, and use ultrasonic vibration to restore the fluidity of the coated magnetic powder; 4. Orient the coated magnetic powder, sinter and heat treat it.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a preparation method of a sintered rare earth iron boron permanent magnet material, belonging to the technical field of magnetic materials. Background technique

[0002] Sintered NdFeB permanent magnet material is the strongest permanent magnet material today, widely used in computer, electronics, communication, automobile, electromechanical and other fields. Sintered NdFeB material has excellent intrinsic magnetism, but as a magnet, there are some limitations, which require technical innovation to improve and optimize its performance.

[0003] There are some typical problems in the existing sintered NdFeB permanent magnet materials, which affect the realization of its excellent performance and better use, such as: 1. The coercive force is much lower than its theoretical value, which affects the magnetic properties and the use at higher temperatures ; 2. Poor mechanical properties, easy to be brittle, affecting the service lif...

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