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Sintered praseodymium iron boron permanent magnet material and production method thereof

A technology of praseodymium iron boron and permanent magnets, which is applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of low melting point, narrow tempering process range, difficulty in obtaining magnets with high coercive force, etc., and achieve high coercivity The best effect of coercive force and magnetic field

Active Publication Date: 2018-09-11
BEIJING ZHONG KE SAN HUAN HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] For sintered praseodymium iron boron magnets, in the actual heat treatment and tempering process, because the melting point of the praseodymium-rich phase is lower than that of the neodymium-rich phase, and it is easier to undergo solid solution reprecipitation reaction with the main phase, the tempering process range is narrow and it is difficult to obtain high coercivity magnet
Therefore, the technical solutions in the above two patent documents cannot produce magnets suitable for cryogenic undulators

Method used

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  • Sintered praseodymium iron boron permanent magnet material and production method thereof
  • Sintered praseodymium iron boron permanent magnet material and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0042] 1. Preparation of praseodymium-iron-boron magnets

[0043] In the first step, the following raw materials are prepared by weight percentage: 31% of Pr, 1% of Dy, 0.1% of Al, 0.3% of Co, 0.08% of Cu, 0.12% of Ga, 0.96% of B and the balance of Fe . The above raw materials are melted in a vacuum strip furnace to obtain a strip alloy sheet with a thickness of 0.1-0.5mm.

[0044] In the second step, the strip alloy sheet is subjected to hydrogen crushing treatment, and then micropowder is prepared in a jet mill, and the average particle size of the micropowder is controlled at 4.0 μm.

[0045] In the third step, the fine powder is mixed in a container filled with nitrogen, and then the mixed fine powder is pressed into a blank under the protection of an inert gas. The orientation magnetic field of the press is ≥2T, and the size of the electromagnet pole head is greater than or equal to 1.3 times the gap size in the orientation direction of the mold. At the same time, when ...

Embodiment 2

[0062] In the first step, the following raw materials are prepared by weight percentage: 27% of Pr, 3% of Nd, 0.5% of Dy, 0.5% of Tb, 0.4% of Al, 0.3% of Co, 0.1% of Cu, 0.2% of Ga , 1% of B and the balance of Fe. The strip alloy sheet is obtained by smelting in a vacuum strip furnace, and the thickness of the strip alloy sheet is 0.1-0.5 mm.

[0063] In the second step, the strip alloy flakes are first subjected to hydrogen crushing treatment, and then fine powder is prepared in a jet mill, and the average particle size of the fine powder is controlled at 3.5um.

[0064] In the third step, the fine powder is mixed in a container filled with nitrogen, and the mixed fine powder is pressed into a blank under the protection of an inert gas. The orientation magnetic field of the press is ≥2T, and the size of the electromagnet pole head is greater than or equal to 1.3 times the size of the gap in the mold orientation direction. At the same time, when installing the mold, ensure th...

Embodiment 3

[0071] In the first step, the following raw materials are prepared by weight percentage: 25% of Pr, 4% of Nd, 0.3% of Tb, 0.1% of Al, 0.98% of B and the balance of Fe. The above raw materials are smelted in a vacuum strip furnace to obtain an alloy, and the thickness of the strip alloy sheet is 0.1-0.5mm.

[0072] In the second step, the strip alloy flakes are first subjected to hydrogen crushing treatment, and then fine powder is prepared in a jet mill, and the average particle size of the obtained fine powder is controlled at 3.0um.

[0073] In the third step, the fine powder is mixed in a container filled with nitrogen, and the mixed fine powder is pressed into a blank under the protection of an inert gas. The orientation magnetic field of the press is ≥2T, and the size of the electromagnet pole head is greater than or equal to 1.3 times the size of the gap in the mold orientation direction. At the same time, when installing the mold, ensure that the center of the magnetiza...

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Abstract

The present invention provides a sintered praseodymium iron boron permanent magnet material and a manufacturing method therefor. The sintered praseodymium iron boron permanent magnet material consists of the following components: praseodymium, neodymium, dysprosium, terbium, M, iron and boron, wherein the content of praseodymium is 25-31 wt%, the content of neodymium is 0-5 wt%, the total content of dysprosium and terbium is 0-0.5 wt%, M is one or more from cobalt, copper, aluminum, gallium, niobium and zirconium elements and the content of M is 0.1-1 wt%, the content of boron is 0.97-1 wt%, the rest being iron. The sintered praseodymium iron boron permanent magnet material is highly magnetic and has strong resistance to radiation caused demagnetization in a low temperature environment, and is suitable to be used as a magnet for a synchronous radiation source low temperature undulator. The present invention further provides a production method of the sintered praseodymium iron boron permanent magnet material.

Description

technical field [0001] The invention relates to a sintered praseodymium iron boron permanent magnet material and a production method thereof, belonging to the technical field of magnetic material production and application. Background technique [0002] In the field of synchrotron radiation research, conventional permanent magnet undulators usually use NdFeB as the magnet material, and use periodic magnetic structures to generate periodic magnetic fields, which are widely used in research work in the fields of materials and life sciences. The low-temperature undulator is based on the conventional undulator, and the magnet is applied to a low-temperature environment to obtain a stronger peak magnetic field. [0003] The selection of magnetic materials for low-temperature undulators needs to be considered from two aspects. On the one hand, the strength of magnetic properties at low temperatures is measured by key parameters such as remanence and intrinsic coercive force. Anot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/08C22C33/02C21D1/18
Inventor 王浩颉陈国安白山宋琪陆辉华张益诚田小兵
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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