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Fabrication method of nanometer composite phase rare-earth permanent magnet material

A rare earth permanent magnet and nanocrystalline soft magnetic technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of weakening the remanence strengthening effect, coarsening of nanocrystalline magnetic powder, etc., to suppress the growth and coarsening of grains , the effect of high residual magnetic polarization and high magnetic energy product

Active Publication Date: 2016-11-16
SHENZHEN WAVE MULTIMEDIA
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, during the sintering process, the nanocrystalline magnetic powder is easily coarsened, which weakens the remanence strengthening effect.

Method used

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  • Fabrication method of nanometer composite phase rare-earth permanent magnet material
  • Fabrication method of nanometer composite phase rare-earth permanent magnet material
  • Fabrication method of nanometer composite phase rare-earth permanent magnet material

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preparation example Construction

[0022] The preparation method of the nanocomposite rare earth permanent magnet material of the present invention comprises the following steps:

[0023] Provide amorphous hard magnetic alloy powder and amorphous soft magnetic alloy powder;

[0024] Crystallize amorphous hard magnetic alloy powder into nanocrystalline hard magnetic powder, and crystallize amorphous soft magnetic alloy powder into nanocrystalline soft magnetic powder;

[0025] The nano-composite phase rare earth permanent magnetic material is obtained by spark plasma sintering nanocrystalline hard magnetic powder and nanocrystalline soft magnetic powder.

[0026] The above-mentioned hard magnetic alloy is an alloy with strong anti-demagnetization ability (high coercive force Hc), can maintain the magnetized state after magnetization, and generate a sufficiently strong and stable magnetic field around it. The hard magnetic alloy has a large coercive force (Hc) (>102A / m), a large remanence Br, a large hysteresis ...

Embodiment 1

[0048] A hard magnetic phase Nd 2 Fe 14 B is the Nd of the matrix 2 Fe 14 B / α-Fe type nanocomposite rare earth permanent magnet material, its preparation method comprises the following process steps:

[0049] (1) According to the stoichiometric ratio of the chemical expression of the main phase, the raw materials are mixed: take Nd content of 10.8 at.%, Fe content of 76.2 at.%, B content of 6.4 at.%, Zr, Mo, Cr or Ti, etc. The content of trace components is 4.2at.%, to prepare Nd 2 Fe 14 Hard magnetic alloy (A alloy) raw material powder with B as the main phase; Fe content 80at.%, Ti, V, Mo and B and other trace elements content 20at.%, to prepare soft magnetic alloy whose main phase is α-Fe Raw material powder of magnetic alloy (B alloy).

[0050] (2) By means of mechanical alloying, put the prepared raw material powders of Alloy A and Alloy B together with stainless steel grinding balls into a stainless steel ball milling tank (the weight ratio of grinding balls and ra...

Embodiment 2

[0063] A hard magnetic phase Nd 2 Fe 14 B is the Nd of the matrix 2 Fe 14 B / Fe 3 B-type nanocomposite phase rare earth permanent magnet material, its preparation method comprises the following process steps:

[0064] (1) According to the stoichiometric ratio of the chemical expression of the main phase, the raw materials are mixed: take Nd content of 13.2 at.%, Fe content of 81.6 at.%, B content of 5.2 at.%, Zr, Mo, Cr or Ti and other trace amounts The content of components is 2.4at.%, to prepare Nd 2 Fe 14 Hard magnetic alloy (A alloy) raw material powder with B as the main phase; Fe content is 69.2 at.%, B content is 25.6 at.%, and other trace components such as V, Mo, Cr are 5.2 at.%. Prepare the main phase as Fe 3 Raw material powder of soft magnetic alloy (C alloy) of B.

[0065] (2) By means of mechanical alloying, put the prepared raw material powders of Alloy A and Alloy C together with stainless steel grinding balls into a stainless steel ball mill jar (the we...

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Abstract

The invention provides a fabrication method of a nanometer composite phase rare-earth permanent magnet material. The fabrication method comprises the following steps of providing amorphous-state hard magnetic alloy powder and amorphous-state soft magnetic alloy powder; enabling the amorphous-state hard magnetic alloy powder to be crystallized to nanometer crystal hard magnetic powder, and enabling the amorphous-state soft magnetic powder to be crystallized to nanometer crystal soft magnetic powder; and obtaining the nanometer composite phase rare-earth permanent magnet material through discharging plasma sintering on the nanometer crystal hard magnetic powder and the nanometer crystal soft magnetic powder. By the fabrication method of the nanometer composite phase rare-earth permanent magnet material, the mixing proportion of the nanometer crystal hard magnetic powder and the nanometer crystal soft magnetic powder which are prepared in advance can be effectively controlled, and the change range of magnetic performance can be further accurately controlled; and low-temperature and fast sintering is achieved by a discharging plasma sintering technology, the grain growth can be effectively prevented, the grain boundary is purified, the compactness of a sintering material can also be substantially improved, and the nanometer composite phase rare-earth permanent magnet material having remanent magnetic polarization, high density and high magnetic energy product is fabricated.

Description

technical field [0001] The invention relates to the technical field of permanent magnet materials, in particular to a preparation method of nanocomposite rare earth permanent magnet materials. Background technique [0002] Nano-composite rare-earth permanent magnet materials, also known as exchange-coupled rare-earth permanent magnets, are two-phase coherent permanent magnets formed by compounding a hard magnetic phase with high magnetic crystal anisotropy and a soft magnetic phase with high saturation magnetization in the nanoscale range. The material has a remanence enhancement effect and is characterized by a single ferromagnetic phase, and its theoretical magnetic energy product is as high as 1000KJ / m 3 , which is twice the theoretical energy product of sintered NdFeB magnets. Moreover, its rare earth content is low, its chemical stability is good, and it can meet the requirements of low cost and high performance at the same time, so it has high practical value and is e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/00H01F1/057H01F1/153B22F3/105B22F9/04
CPCB22F3/105B22F9/04B22F2009/041H01F1/0045H01F1/0571H01F1/153
Inventor 郭浩庄健张少林
Owner SHENZHEN WAVE MULTIMEDIA
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