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Sintered NdFeB permanent magnet with high working temperature and high corrosion resistance

A working temperature, permanent magnet technology, applied in the direction of magnetic objects, magnetic materials, inorganic materials, etc., can solve the problems of magnet remanence or magnetic energy product decline, magnet corrosion performance has not been well improved and so on

Inactive Publication Date: 2009-08-05
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantages of the above-mentioned patents are that while the coercive force of the magnet is increased, the remanence or magnetic energy product of the magnet is reduced, and the corrosion performance of the magnet has not been well improved.

Method used

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  • Sintered NdFeB permanent magnet with high working temperature and high corrosion resistance
  • Sintered NdFeB permanent magnet with high working temperature and high corrosion resistance
  • Sintered NdFeB permanent magnet with high working temperature and high corrosion resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1a

[0112] 1) Prepare the main phase alloy and the grain boundary phase alloy separately. The main phase alloy adopts the quick-setting sheet technology, the surface speed of the copper roller is 1.2m / s, and the composition is Nd 13.12 Fe 80.69 B 5.73 (Dy 0.22 al 0.24 )(at%), the grain boundary phase alloy is prepared into a rapid quenching zone with a rapid quenching speed of 18m / s, and the composition is Nd 17.2 Fe 75.58 B 6.38 Dy 0.64 Ga 0.2 (at%).

[0113] 2) Powder the main phase alloy and the grain boundary phase alloy respectively. Coarse crushing by jaw crusher, intermediate crushing by secondary crusher, and then jet milling under nitrogen protection, the main phase alloy is made into powder with an average particle diameter of 3 μm, and the grain boundary phase alloy is made into a powder with an average particle diameter of 1 μm of powder.

[0114] 3) In the grain boundary phase alloy powder, respectively add nano-titanium (average particle diameter is 40nm) ...

Embodiment 1b

[0119] The method of embodiment 1b is the same as that of embodiment 1a, except that nano-copper powder is used in step 3). The properties obtained are shown in Comparative Example 1.

Embodiment 1c

[0121] The method of embodiment 1c is the same as that of embodiment 1a, except that nano-titanium nitride powder is used in step 3). The properties obtained are shown in Comparative Example 1.

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Abstract

The invention provides a sintered Nd-Fe-B (neodymium iron boron) permanent magnet combination with high working temperature and high corrosion resistance; the composition of the magnet comprises 80-95% of main phase alloy powder and 5-20% of nano-modified grain-boundary-phase alloy powder, taking the total weight of the permanent magnet combination in calculation; the main phase alloy powder is calculated by atomic percentage, and the composition comprises NdaFe100-a-b-cBbMc, wherein a is no less than 11 but no more than 16, b is no less than 5.4 but no more than 6.6, and c is no less than 0 but no more than 6, and M is one or more types of elements Dy, Tb, Nb, Co, Ga, Zr, and Al; and the average particle diameter of the main phase alloy powder is 3-8 mu m. The invention also provides a sintered Nd-Fe-B permanent magnet which simultaneously has high working temperature and high corrosion resistance.

Description

technical field [0001] The invention relates to a heat-resistant and corrosion-resistant NdFeB permanent magnet composition, in particular to a high-working-temperature and high-corrosion-resistant NdFeB magnet combination prepared based on a dual-alloy process grain boundary phase nano-modification technology thing. Background technique [0002] Sintered NdFeB permanent magnet material is currently the most magnetic permanent magnet, with excellent characteristics such as high magnetic energy product and high cost performance. Since the invention of NdFeB-based rare earth permanent magnet in Japan in 1983, the world's total output has changed from less than 1 ton jumped to nearly 50,000 tons in 2006. It is the most important permanent magnet material at present and in the future. It has become an important material basis for modern science and technology and people's lives. [0003] The main technical performance index of NdFeB material is remanence B r , coercive force ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08B22F9/04B22F3/12
Inventor 严密周向志马天宇罗伟樊熊飞任强民
Owner ZHEJIANG UNIV
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