Praseodymium-Ferrum-Boron permanent magnet and preparation method thereof

A technology of permanent magnets and praseodymium-iron-boron, applied in the field of praseodymium-iron-boron permanent magnets and its preparation, can solve problems such as poor vacuum sealing, increased corner size, and poor dimensional accuracy, and achieve excellent magnetic properties, low manufacturing cost, Effect of good magnetic field stability

Inactive Publication Date: 2014-01-01
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

Generally, the coating used for ordinary sintered NdFeB or PrFeB is Ni/Cu/Ni coating. The disadvantage is that it...

Method used

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  • Praseodymium-Ferrum-Boron permanent magnet and preparation method thereof
  • Praseodymium-Ferrum-Boron permanent magnet and preparation method thereof
  • Praseodymium-Ferrum-Boron permanent magnet and preparation method thereof

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Embodiment Construction

[0048] The preparation method of praseodymium iron boron permanent magnet of the present invention is as figure 1 As shown, the method includes the following steps:

[0049] (1) Dosing according to the alloy composition and preparing alloy powder

[0050] The alloy composition is designed according to the principles of high Br and high Hci, while considering factors such as squareness, Pr loss, oxygen content, temperature coefficient, etc., as follows (the content of each element involved in the following is a mass percentage):

[0051] i. In order to maintain the main phase magnetic structure, while considering the easy oxidation of metal Pr, the content of metal Pr is controlled at 30.3%, and considering the actual loss in the oxidation and smelting process, the content of metal Pr is appropriately increased to no more than 31.8%;

[0052] ii. In order to increase the intrinsic coercive force of the permanent magnet, while considering factors such as cost and low-temperatur...

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Abstract

The invention provides a Praseodymium-Ferrum-Boron permanent magnet and a preparation method of the Praseodymium-Ferrum-Boron permanent magnet. The permanent magnet is made from an alloy with a mass percent represented by Pr<30.3+a+b>Fe<67.16-x-y-z>Cu<x>Nb<y>Al<z>B<1.04>, wherein a+b represents the lost mass percent of praseodymium in oxidization and melting processes; a+b is not larger than 1.5, x is not smaller than 0.15 and not larger than 0.20, y is not smaller than 0.14 and not larger than 0.5, and z is not smaller than 0.4 and not larger than 0.55. The Praseodymium-Ferrum-Boron permanent magnet can achieve high Br and high Hci simultaneously at normal temperature and is excellent in magnetic performance, low in preparation cost, and good in magnetic field stability, magnetic field homogeneity and plating airtightness; the Praseodymium-Ferrum-Boron permanent magnet can realize practical application in the engineering of high-precision low-temperature permanent magnet devices such as cryogenic permanent magnet undulators (CPMU) as well as in the fields of space instruments and meters.

Description

technical field [0001] The invention relates to a PrFeB permanent magnet and a preparation method thereof. The PrFeB permanent magnet prepared by the method can be used in various high-precision low-temperature permanent magnet devices such as low-temperature undulator (CPMU) inserts of synchrotron radiation sources, etc. It can also be used in fields such as space instrumentation. Background technique [0002] After nearly 30 years of research and development of sintered neodymium iron boron (NdFeB) permanent magnets, the remanence Br of commercial NdFeB at room temperature has reached 1.5T, which is close to 93.8% of the theoretical value, and there is little room for further improvement; the intrinsic coercivity The force Hci has also been greatly improved, and the highest has reached more than 3000KA / m, which is close to 53.5% of the theoretical value. In addition, NdFeB exhibits spin reorientation (SRT) at 130-150K, which limits the further improvement and application ...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057B22F3/16
Inventor 何永周吴红平
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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