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Method for preparing corrosion-resistant high-performance sintered neodymium iron boron magnets

A NdFeB, high-performance technology, used in inductor/transformer/magnet manufacturing, electrical components, circuits, etc., can solve problems such as difficulties, limiting the application of NdFeB materials, and increasing manufacturing costs

Active Publication Date: 2012-07-11
YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has difficulties in practical application, because the metal element cobalt is a strategic metal, and the price is very expensive.
However, a large number of NdFeB magnets used as civilian materials are cheap, and if more cobalt is added, the manufacturing cost will increase significantly
This will undoubtedly greatly limit the application of NdFeB materials

Method used

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  • Method for preparing corrosion-resistant high-performance sintered neodymium iron boron magnets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The method for preparing a corrosion-resistant high-performance sintered NdFeB magnet of the present invention comprises the following steps:

[0021] 1) The main phase alloy material with a purity greater than 99% is prepared according to the weight ratio of Nd23%, Pr6%, Fe69.65%, Cu0.1%, Ga0.1%, Al0.1%, and B1.05%. The 200Kg / time strip billet is melted in the continuous casting furnace, and the main phase alloy sheet is cast at a roll speed of 1.5m / s, and the thickness of the alloy sheet is 0.2-0.3mm.

[0022] 2) The grain boundary phase alloy material with a purity greater than 99% is formulated according to the following weight ratios: Nd18%, Pr8%, Dy20%, Fe50.9%, Cu0.4%, Ga0.2%, Al2%, B0.5% , using a rapid quenching process with a copper roll speed of 20m / s to make a rapidly quenched grain boundary phase alloy strip, and the thickness of the alloy strip is 40-60μm.

[0023] 3) The main phase alloy flakes and the grain boundary phase alloy strips are powdered separ...

Embodiment 2

[0029] The method for preparing a corrosion-resistant high-performance sintered NdFeB magnet of the present invention comprises the following steps:

[0030] 1) The main phase alloy material with a purity greater than 99% is prepared according to the weight ratio of Nd23%, Pr6%, Fe69.65%, Cu0.1%, Ga0.2%, and B1.05%. The slab is melted in a continuous casting furnace, and cast at a roll speed of 1m / s to form a main phase alloy sheet with a thickness of 0.1-0.4mm.

[0031] 2) The grain boundary phase alloy material with a purity greater than 99% is prepared according to the following weight ratios: Nd18%, Pr8%, Dy20%, Fe50.9%, Cu0.6%, Al2%, B0.5%, using 15m / s The rapid quenching process of the red copper roll speed is used to make the rapidly quenched grain boundary phase alloy strip, and the thickness of the alloy strip is 40-60μm.

[0032] 3) The main phase alloy flakes and the grain boundary phase alloy strips are powdered separately: the main phase alloy flakes are crushed ...

Embodiment 3

[0038] The method for preparing a corrosion-resistant high-performance sintered NdFeB magnet of the present invention comprises the following steps:

[0039] 1) The main phase alloy material with a purity greater than 99% is prepared according to the weight ratio of Nd23%, Pr6%, Fe69.65%, Cu0.1%, Al0.2%, and B1.05%. The slab is melted in a continuous casting furnace and cast at a roll speed of 2m / s to form a main phase alloy sheet with a thickness of 0.1-0.4mm.

[0040] 2) The grain boundary phase alloy material with a purity greater than 99% is prepared according to the following weight ratios: Nd18%, Pr8%, Dy20%, Fe50.9%, Ga0.6%, Al2%, B0.5%, using 30m / s The rapid quenching process of the red copper roll speed is used to make the rapidly quenched grain boundary phase alloy strip, and the thickness of the alloy strip is 30-80μm.

[0041] 3) The main phase alloy flakes and the grain boundary phase alloy strips were powdered separately: the main phase alloy flakes were crushed...

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Abstract

The invention relates to a method for preparing corrosion-resistant high-performance sintered neodymium iron boron magnets, which belongs to a preparation method. The method includes: melting main-phase alloy materials in a continuous casting furnace with blanks, casting the melted main-phase alloy materials to be main-phase alloy pieces, manufacturing crystal-boundary phase alloy materials to rapid-quenching crystal-boundary phase alloy bands; powdering the main-phase alloy pieces and the crystal-boundary phase alloy bands, adding the crystal-boundary phase alloy powder in the anaerobic environment into nanometer Co powder to be mixed uniformly, mixing the crystal-boundary phase alloy powder which is mixed with the nanometer Co with the crushed main-phase alloy powder uniformly, orienting and pressing the mixture into pressed blanks in the magnetic field of the anaerobic environment, feeding the pressed blanks into a vacuum sintering furnace in the anaerobic environment under the protection of the inert gas, and preparing high-corrosion-resistance neodymium iron boron magnets after sintering at high temperature three times and ageing twice. The sintered neodymium iron boron magnets prepared by the method are high in corrosion resistance and low in cost.

Description

technical field [0001] The invention relates to a method for manufacturing articles by using metal particles, in particular to a method for manufacturing articles by changing the properties of metal powder. Background technique [0002] Since the sintered R-Fe-B series permanent magnet came out in 1983, because of its excellent magnetic properties, relatively low price and sufficient resource reserves, it has rapidly been used in computers, electrical engineering, medical equipment, mobile phones, household appliances, communications, Widely used in the automotive industry and other fields. However, the most obvious disadvantage of R-Fe-B permanent magnets compared with Sm-Co permanent magnets is their poor corrosion resistance, which limits the application of such magnets in humid, high temperature and other environments, so about R-Fe-B It is of great significance to study the corrosion resistance of sintered permanent magnets. In recent years, with the improvement of aw...

Claims

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Application Information

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IPC IPC(8): H01F41/02C22C33/02C22C38/00B22F3/16B22F9/04
Inventor 于永江李广军史丙强杜伟赵福永
Owner YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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