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Preparation method of cerium-rich magnet used for driving motor

A driving motor and cerium-rich technology, which is applied in the manufacture of inductors/transformers/magnets, magnetic objects, circuits, etc., can solve the problems of long process, many rare-earth permanent magnet preparation procedures, oxidation, etc., so as to reduce the sintering temperature and benefit Coercive force, the effect of preventing oxidation

Active Publication Date: 2018-08-17
NINGBO SHUOTENG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, due to the many procedures and long process for the preparation of rare earth permanent magnets, in each process link, alloy powder or magnet blanks may be exposed to oxygen, resulting in a certain degree of oxidation

Method used

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  • Preparation method of cerium-rich magnet used for driving motor

Examples

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Comparison scheme
Effect test

preparation example Construction

[0027] see figure 1 , which is a flow chart of a method for preparing a cerium-rich magnet for driving a motor provided by the present invention, which includes the following steps:

[0028] S101: Provide the powder material of the cerium-rich magnet, wherein the composition and mass percentage of the cerium-rich magnet are (Ce 1-x R x ) a Fe 100-a-b-c m b B c , wherein, R is at least one of Nd, Pr, Dy, Tb, Ho, Gd, M is at least one of Co, Al, Cu, Ga, Nb, Zr, 0.5≤x≤0.9, 28.0≤a ≤33, 0.1≤b≤5, 0.8≤c≤1.1;

[0029] S102: Prepare cerium-iron-boron alloy quick-setting sheet by using quick-setting process;

[0030] S103: Coarsely crushing the cerium-iron-boron alloy quick-setting sheet by using a hydrogen crushing process to make a hydrogen crushing powder;

[0031] S104: put the hydrogen powder into a mixing tank filled with inert gas and hydrogen, and mix evenly;

[0032] S105: Use the jet mill process to further crush the hydrogen powder into fine powder, and add hydrogen ...

Embodiment 1

[0041] Embodiment 1, it comprises the steps:

[0042] The cerium-iron-boron alloy quick-setting sheet is prepared by the quick-setting process, and its composition and mass percentage are Ce6.5Nd18.4Pr7.1Fe64.6Co1.2Al0.4Cu0.15Ga0.5Nb0.2B0.95;

[0043] Use the hydrogen crushing process to roughly crush the quick-setting tablets to make hydrogen crushing powder;

[0044] Put the hydrogen broken powder into the mixing tank, fill the tank with nitrogen to 0.2Mpa, then fill with 150ppm hydrogen, add an appropriate amount of antioxidant and gasoline into the tank, and mix for 2 hours;

[0045] The mixed hydrogen crushing powder is further crushed by using a jet mill process, the amount of hydrogen added in the jet mill process is 100ppm, and the particle size distribution of the prepared fine powder is 2.1-2.8 microns.

[0046] The jet-milled fine powder is formed by magnetic field orientation, isostatic pressing, vacuum sintering and tempering heat treatment at one time. Wherein,...

Embodiment 2

[0048] In Example 2, a cerium-rich magnet was prepared using the same ingredients as in Example 1 and a similar preparation process, the difference being: (1) Hydrogen gas was not charged during the hydrogen breaking and mixing process; (2) Hydrogen gas was charged during the jet milling process. 250ppm hydrogen. The performance test uses a permanent magnet characteristic performance measuring instrument, and the test temperature is room temperature.

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Abstract

Disclosed is a preparation method of a cerium-rich magnet used for a driving motor. The cerium-rich magnet is alloy powder of cerium iron boron; and the cerium-rich magnet comprises the chemical formula based on mass percentages as follows: (Ce<1-x>R<x>)Fe<100-a-b-c>MB<c>. The preparation method of the cerium-rich magnet comprises the following steps of preparing a cerium iron boron alloy rapid hardening sheet by adopting a rapid hardening process; performing rough smashing on the cerium iron boron alloy rapid hardening sheet by adopting a hydrogen demolishing process to prepare hydrogendemolished powder; putting the hydrogen demolished powder into a material mixing tank which is filled with inert gas and hydrogen to be mixed uniformly; performing further smashing on the hydrogen demolished powder by adopting an air flow mill process to obtain fine powder, and supplementing hydrogen in the air flow milling process; and performing orientation and forming on the fine powder afterair flow milling, and then carrying out isostatic pressing, vacuum sintering and a tempering heat treatment process to prepare the cerium-rich magnet used for the driving motor. By adding a trace of hydrogen to the steps of hydrogen demolished powder mixing and air flow milling powder making, oxidization of the cerium-rich magnet alloy powder is lowered, so that the performance of the obtained cerium-rich magnet is further improved.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet materials, in particular to a preparation method of a cerium-rich magnet used for driving a motor. Background technique [0002] Rare earth permanent magnet materials represented by NdFeB are widely used in power electronics, information communication, transportation, electrical machinery, office automation, medical equipment, aerospace and other fields due to their excellent magnetic properties, and make some highly integrated high-tech The application of technical products is called possible, such as hybrid vehicles, electric vehicles, windmills for power generation, etc. With the development of industry and the progress of society, the use of NdFeB is increasing year by year, consuming a large amount of rare earth metals such as neodymium (Nd), praseodymium (Pr), dysprosium (Dy), terbium (Tb). In order to save the use of scarce rare earths, balance the utilization of rare earths, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057B22F9/02B22F9/04
CPCB22F9/023B22F9/04H01F1/0577H01F41/0253H01F41/0266
Inventor 李安华靳朝相邹宁吕忠山冯海波邹永博邹宇钦
Owner NINGBO SHUOTENG NEW MATERIAL CO LTD
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