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A kind of high coercive force NdFeB permanent magnet material and preparation method thereof

A permanent magnet material, high coercivity technology, applied in the direction of magnetic materials, inorganic material magnetism, magnetic objects, etc., can solve the problems of inability to guarantee material uniformity and low coercivity, and achieve high coercivity and raw material cost. Low, quality-assured effects

Active Publication Date: 2016-01-20
XUZHOU NANFANG YONGCI MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The method adopted in the compaction molding in the above preparation method cannot guarantee the uniformity of the material, and the coercive force of the obtained NdFeB magnet is 11.9kOe, which is relatively low

Method used

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  • A kind of high coercive force NdFeB permanent magnet material and preparation method thereof
  • A kind of high coercive force NdFeB permanent magnet material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of the high coercive force NdFeB permanent magnet material of the present invention, the specific steps are as follows:

[0028] (1) La3%, Ce2%, Nd22%; Co0.5%, Cr0.3%; Pb0.5%, B0.5%, Si0.5%, Sc0.3%, Sb0 are respectively taken according to the following weight percentages .5%, and the rest is Fe for batching; the purity of La, Ce, Nd, Co, Cr, Pb, Sb, B, Si, Sc and Fe are all greater than 99.9%;

[0029] (2) Put the raw materials into a vacuum induction furnace for melting, the melting temperature is 1660°C, and after standing for 2 minutes, the master alloy liquid is obtained;

[0030] (3) Cast the master alloy liquid onto the roller below the taphole of the induction furnace. The master alloy liquid encounters the rotating roller and is dragged by the roller rim to form a casting belt; the rotational speed of the roller rim is 12m / s; the thickness of the casting belt is about 200μm, and the width is about 10mm;

[0031] (4) Cool the cast strip n...

Embodiment 2

[0036] The preparation method of the high coercive force NdFeB permanent magnet material of the present invention, the specific steps are as follows:

[0037] (1) La8%, Ce4%, Nd25%, Co1%, Cr0.6%; Pb1%, B1%, Si0.7%, Sc0.6%, Sb0.9% are taken according to the following weight percentages, and the rest are Fe is used for batching; the purity of La, Ce, Nd, Co, Cr, Pb, Sb, B, Si, Sc and Fe are all greater than 99.9%;

[0038] (2) Put the raw materials into a vacuum induction furnace for melting, the melting temperature is 1700°C, and after standing for 3 minutes, the master alloy liquid is obtained;

[0039] (3) Cast the master alloy liquid onto the roller below the taphole of the induction furnace. The master alloy liquid encounters the rotating roller and is dragged by the roller rim to form a casting belt; the rotational speed of the roller rim is 14m / s; the thickness of the casting belt is about 400μm, and the width is about 20mm;

[0040] (4) Cool the cast strip naturally fo...

Embodiment 3

[0045] The preparation method of the high coercive force NdFeB permanent magnet material of the present invention, the specific steps are as follows:

[0046] (1) Take La5%, Ce3%, Nd23%, Co0.8%, Cr0.5%, Pb0.7%, B0.8%, Si0.6%, Sc0.4%, Sb0 according to the following weight percentages respectively .7%, and the rest is Fe for batching; the purity of La, Ce, Nd, Co, Cr, Pb, Sb, B, Si, Sc and Fe are all greater than 99.9%;

[0047] (2) Melting the raw materials in a vacuum induction furnace at a melting temperature of 1780°C and standing for 4 minutes to obtain a master alloy liquid;

[0048] (3) The master alloy liquid is cast on the roller below the taphole of the induction furnace. The master alloy liquid encounters the rotating roller and is dragged by the roller rim to form a casting belt; the rotational speed of the roller rim is 16m / s; the thickness of the casting belt is about 600μm, and the width is about 30mm.

[0049] (4) Cool the cast strip naturally for 10 minutes, a...

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Abstract

The invention provides a high-coercivity neodymium-iron-boron permanent magnet material and a preparation method thereof. The material has relatively high coercivity; the preparation method has simple process, low production cost and is suitable for industrialized production. The weight percentage content of each component of the material is: La? 3-8%, Ce? 2-4%, Nd? 22-25%; Co? 0.5-1%, Cr? 0.3-0.6%, Pb? 0.5-1%, Sb? 0.5-0.9%, B? 0.5-1%, Si? 0.5-0.7%, Sc? 0.3-0.6%, the rest is Fe.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a high-coercivity neodymium-iron-boron permanent magnet material and a preparation method thereof. Background technique [0002] Application No. CN201310218161.3 discloses a preparation method of sintered NdFeB permanent magnet material formed under carbon dioxide protection. The steps include: batching, flake processing, evacuating to 0.05-0.1Pa and heating to 1700-1800°C for 4-6 minutes ;Hydrogen pulverization means vacuuming 0.05~0.1Pa, heating to 100-300℃, air pressure in hydrogen pulverization furnace 0.8~1.2atm, hydrogen pulverization for 1.5~2.5 hours; airflow pulverization means controlling the pulverization pressure 5-7atm, Particle size 2-5μm; Molding protection pressing means closed molding in a magnetic field, the magnetic field strength is 16000-25000 Oersted, filled with carbon dioxide gas to a pressure of 0.02-0.05MPa molding; sintering means vacuum degre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/08C22C38/18C22C33/06
Inventor 张作州
Owner XUZHOU NANFANG YONGCI MATERIAL
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