Nano toughening NdFeB magnetic material and preparation method thereof

A magnetic material, neodymium-iron-boron technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of large remanence reduction, easy pulverization and corrosion, low Curie temperature point, etc., to achieve remanence reduction Less, good machinability, avoid the effect of growing up

Inactive Publication Date: 2012-10-24
辽宁恒德磁业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the Curie temperature point is low, the temperature characteristics are poor, and it is easy to pulverize and corrode. Therefore, it is necessary to further develop toughened magnets to have wider application prospects.
[0005] In the production of NdFeB, various dopant elements are routinely added, such as: Al, Cu, Co, heavy rare earth and other products, the coercive force increases, but the remanence decreases greatly

Method used

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  • Nano toughening NdFeB magnetic material and preparation method thereof
  • Nano toughening NdFeB magnetic material and preparation method thereof
  • Nano toughening NdFeB magnetic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] First use the arc method to process Al, Cu, Nb, Co, Ga, Mn, Ti, Zr, Ni, Mo into nano-materials with a particle size of 40-60nm; then Nd alloy 300.0kg, B 10.8kg, metal Fe 686.4 kg, Mn 0.1kg, Ti 0.1kg, Zr 0.1kg, Ni 0.1kg, Mo 0.1kg The main phase of NdFeB was prepared by SC-HD process, and the vacuum was 3.0×10 -1 Melted under Pa to form thin slices with a thickness of 0.25-0.35 mm, the thin slices absorb hydrogen at room temperature for 2.5 hours in the reaction kettle of the hydrogen crushing furnace, and then heat to 550-650 ° C for 6.5 hours to dehydrogenate, and prepare a particle size of 60-80 mesh Coarse particles for spare;

[0034] The above-mentioned coarse particles are ground by a QLM-400 jet mill under a working pressure of 0.8 MPa to a fine powder with an average particle size of 3.0-4.0 μm; then, in an argon protective atmosphere, compoundly add Al to the fine powder by the jet method 0.5kg, Cu 0.6kg, Nb 0.4kg, Co 0.4kg, Ga 0.4kg, and uniformly mixed in a m...

Embodiment 2

[0042] The difference from Example 1 is that the alloy flakes absorb hydrogen at room temperature for 2.5 hours in the reaction kettle of the hydrogen crushing furnace, heat and dehydrogenate for 6 hours; uniformly mix for 3 hours; the size of the green body is 60×60×60 mm, and other process routes are the same as in the example 1. Refer to Table 1 for the amount of raw materials input.

[0043] The material parameter relevant to this embodiment is similar to embodiment 1, omitted.

Embodiment 3

[0045] The difference from Example 1 is that the alloy flakes absorb hydrogen at room temperature for 3 hours in the reaction kettle of the hydrogen crushing furnace, heat and dehydrogenate for 7 hours; uniformly mix for 2 hours; the size of the green body is 70×70×70mm, and other process routes are the same as in the example 1. Refer to Table 1 for the amount of raw materials input.

[0046] The material parameter relevant to this embodiment is similar to embodiment 1, omitted.

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Abstract

The invention discloses a nano toughening NdFeB magnetic material and a preparation method of the nano toughening NdFeB magnetic material. The main mechanism is that a nano composite crystal boundary phase is formed on an NdFeB main phase crystal boundary, an H-grade rare earth permanent magnetic material with high coercive force M is prepared without doping any heavy rare earth, and then, a SH-grade rare earth permanent magnetic material is prepared by adding a little heavy rare earth. The nano material is prepared by a plasma arc method, has a grain size of 5-80nm and mainly contains metallic elements, such as Al, Cu, Cr, Co, Fe, Zn and the like, and all kinds of rare earth elements. A NdFeB main phase having a rare earth content of Pr-Nd is prepared by a SC-HD process; after smelting and hydrogen breaking, the product grain size is milled to be about 3.5 microns by an air-current mill, and in the argon protection atmosphere, a nano additive is added in a manner of jetting composite, so the nano additive is uniformly attached to the NdFeB main phase. In the sintering process, the nano powder and the main phase form the crystal boundary, the coercive force of NdFeB is greatly increased, and since the product has uniform crystal components, the machining property is also elevated well, the NdFeB magnetic material can be applied to the wider field. At the same time, the technical process is simple, low-cost and suitable for the batch production.

Description

technical field [0001] The invention relates to the technical field of NdFeB production by directly adding nano-additives to form grain boundary phases, in particular to a nano-toughened NdFeB magnetic material with high coercive force and high processing performance and a preparation method. Background technique [0002] NdFeB magnetic material, as the latest result of the development of rare earth permanent magnet materials, is known as the "Magnetic King" because of its excellent magnetic properties. NdFeB magnetic materials are alloys of neodymium, boron, iron, etc. Also known as magnetic steel. NdFeB has extremely high magnetic energy product and coercive force, and the advantages of high energy density make NdFeB permanent magnet materials widely used in modern industry and electronic technology, so that instruments, electroacoustic motors, magnetic separation Miniaturization, weight reduction, and thinning of equipment such as magnetization are possible. [0003] N...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08B22F1/02
Inventor 杨延华李嘉丁球科王炳智
Owner 辽宁恒德磁业有限公司
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