Sintered NdFeB magnet and preparing method thereof

A NdFeB, magnet technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., to achieve the effect of uniform mixing

Inactive Publication Date: 2018-06-12
TIANJIN SANHUAN LUCKY NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Further, the present invention also needs to solve the problem of how to reduce the entry of oxygen into the NdFeB grain boundary during sintering

Method used

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  • Sintered NdFeB magnet and preparing method thereof
  • Sintered NdFeB magnet and preparing method thereof
  • Sintered NdFeB magnet and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for preparing a sintered NdFeB magnet by improving the grain boundary phase of the magnet, the composition of the raw materials according to its weight percentage is as follows:

[0043] P: NdFeB powder = 0.5:100; the specific preparation steps are as follows:

[0044]Step 1: Prepare NdFeB powder with a powder particle size of D50 (50% passing particle size) = 3.5 μm by jet mill;

[0045] Step 2: Prepare a suspension of phosphorus with a particle size of 150-250 nm by mechanical crushing, rod milling and ball milling, with a concentration of 0.3 g / ml;

[0046] Step 3: Under the atmosphere of nitrogen or argon, according to the mass fraction of phosphorus of 0.5wt%, the prepared suspension is added to the mixing tank containing NdFeB powder, and mixed evenly on the three-dimensional mixer ;

[0047] Step 4: Orienting and pressing the mixed material under a protective atmosphere to obtain a compact;

[0048] Step 5: In a vacuum sintering furnace, select two gr...

Embodiment 2

[0056] A method for preparing sintered NdFeB by improving the grain boundary phase of a magnet, the composition of raw materials according to the weight percentage is as follows:

[0057] CuP:P:NdFeB powder=0.8:0.2:100;

[0058] Concrete preparation steps are as follows:

[0059] Step 1: Prepare NdFeB powder with a powder particle size of D50=3.7 μm by jet mill;

[0060] Step 2: Prepare a suspension of CuP and P with a particle size of 300-400nm by mechanical crushing, rod milling and ball milling, the concentration of CuP is 0.4g / ml, and the concentration of P is 0.1g / ml;

[0061] Step 3: In an atmosphere of nitrogen or argon, according to the ratio of the mass fraction of CuP to 0.8wt% and the mass fraction of P to 0.2wt%, add the prepared suspension to the mixed material containing NdFeB powder In the tank, mix evenly on the three-dimensional mixer;

[0062] Step 4: Orienting and pressing the mixed powder in a protective atmosphere to obtain a compact;

[0063] Step 5: ...

Embodiment 3

[0070] A method for preparing sintered NdFeB by improving the grain boundary phase of a magnet, the composition of raw materials according to the weight percentage is as follows:

[0071] GaP: Co 2 P: CuP: NdFeB powder = 0.2:0.2:0.2:100;

[0072] Concrete preparation steps are as follows:

[0073] Step 1: Prepare NdFeB powder with a powder particle size of D50=3.5 μm by jet mill;

[0074] Step 2: Prepare GaP and Co with a particle size of 300-400nm by mechanical crushing, rod milling and ball milling 2 P, CuP suspension, the concentration is 0.4g / ml;

[0075] Step 3: Under nitrogen or argon atmosphere, according to GaP, Co 2 The mass fractions of P and CuP are all in the ratio of 0.2wt%, and the prepared suspension is added into a mixing tank equipped with NdFeB powder, and mixed evenly on a three-dimensional mixer;

[0076] Step 4: Orienting and pressing the mixed powder in a protective atmosphere to obtain a compact;

[0077] Step 5: Sinter in a vacuum sintering furnac...

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Abstract

The invention relates to a sintered NdFeB magnet and a preparing method thereof. The preparing method of sintered NdFeB includes the step of mixing phosphorus powder and / or phosphorus metallic compound powder with NdFeB magnetic powder to prepare the sintered NdFeB, wherein the granularity of the phosphorus powder and / or phosphorus metallic compound powder is on a nanoscale, and the mass percentage of the phosphorus powder and / or phosphorus metallic compound powder in the total mixture is 0.05-2 wt%. The sintered NdFeB has a continuous crystal interface, phosphorus is segregated at the crystalinterface, the sintered NdFeB is prepared by mixing phosphorus the powder and / or phosphorus metallic compound powder with the NdFeB magnetic powder, the granularity of the phosphorus powder and / or phosphorus metallic compound powder is on a nanoscale, and the mass percentage of the phosphorus powder and / or phosphorus metallic compound powder in the total mixture is 0.05-2 wt%. By means of the technical scheme, the sintered NdFeB is prepared by mixing nanoscale phosphorus and / or other metallic compounds, the state of the crystal interface of the magnet can be better improved, the crystal interface phase is in a thin layer shape and is continuously distributed, the magnetic isolation effect is effectively achieved, and the coercivity of the magnet is remarkably improved.

Description

technical field [0001] The invention mainly relates to a magnet material and a preparation method thereof, in particular to a sintered NdFeB magnet and a preparation method thereof. Background technique [0002] NdFeB has high magnetic energy product and coercive force, and the advantages of high energy and high density make NdFeB permanent magnet materials widely used in modern industry and electronic technology, so that instruments, electroacoustic motors, magnetic separation Magnetization and other equipment can be miniaturized, lightweight, and thinned, and it is widely used in the fields of nuclear magnetic resonance, computers, various motors, and wind power generators. [0003] Good magnetic properties are the main features that make sintered NdFeB permanent magnet materials widely used, especially in the fields of hybrid electric vehicles and wind power generation in traction motors. However, the coercive force (μ 0 h c ~1.2T) is still relatively low, and due to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F41/0266H01F1/0576H01F1/0577
Inventor 董广乐陈风华纪鹏曹会福
Owner TIANJIN SANHUAN LUCKY NEW MATERIAL CO LTD
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