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Manufacturing method of high-coercivity R-Fe-B sintered permanent magnet material

A technology of permanent magnet materials and high coercive force, which is applied in the fields of magnetic materials, inductor/transformer/magnet manufacturing, and the magnetism of inorganic materials. and other problems, to achieve the effect of simple manufacturing process, high coercive force, and improved remanence

Active Publication Date: 2012-07-04
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, in the process of realizing the present invention, the inventor found that the prior art has at least the following disadvantages: there is a limitation in these patented technologies at the same time, the thickness of the magnet cannot exceed 5mm
[0005] Chinese patent document CN1905088A discloses a method for preparing high-coercivity sintered rare earth-iron-boron permanent magnet materials, which can prepare such magnets with unlimited sizes, but the production of nano-dysprosium and terbium used in this patent is extremely difficult and extremely expensive , not conducive to mass production

Method used

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  • Manufacturing method of high-coercivity R-Fe-B sintered permanent magnet material
  • Manufacturing method of high-coercivity R-Fe-B sintered permanent magnet material
  • Manufacturing method of high-coercivity R-Fe-B sintered permanent magnet material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) The raw materials with a purity greater than 99wt% are prepared according to the ratio of Nd24.5Pr6Fe68.4Cu0.1B1, melted in a strip continuous casting furnace of 200-700Kg / time, and cast into alloy sheets at a roll speed of 1.5m / s, The thickness of the alloy sheet is 0.2-0.4mm;

[0032]2) Put the above-mentioned alloy flakes into a hydrogen treatment furnace for hydrogen crushing, and dehydrogenate at a temperature of 400°C until the hydrogen pressure is less than 10Pa; Grinding to a particle size of <0.5mm, then finely pulverizing through a jet mill, and grading to adjust the particle size distribution to make a powder with an average particle size of d=2μm;

[0033] 3) In an oxygen-free environment under the protection of an inert gas, the average particle diameter of 1.18% by weight is 50nm, and the nanometer terbium oxide Tb 4 o 7 The powder is added to the above-mentioned NdFeB powder, and mixed evenly in a mixer.

[0034] 4) Orienting and pressing the unifor...

Embodiment 2

[0043] 1) The raw materials with a purity greater than 99wt% are prepared according to the ratio of Nd24.5Pr6Fe68.4Cu0.1B1, melted in a strip continuous casting furnace of 200-700Kg / time, and cast into alloy sheets at a roll speed of 1.5m / s, The thickness of the alloy sheet is 0.2-0.4mm;

[0044] 2) Put the above alloy pieces into a hydrogen treatment furnace for hydrogen crushing, and dehydrogenate at a temperature of 500°C until the hydrogen pressure is less than 10Pa; Pulverize to a particle size of <0.5mm, then finely pulverize through a jet mill, and classify to adjust the particle size distribution, and make a powder with an average particle size of d=3μm;

[0045] 3) In an oxygen-free environment under the protection of an inert gas, 2% by weight, with an average particle diameter of 60nm, dispersed nano-dysprosium oxide Dy 2 o 3 The powder is added to the above-mentioned NdFeB powder, and mixed evenly in a mixer.

[0046] 4) Orienting and pressing the uniformly mixe...

Embodiment 3

[0054] 1) The raw materials with a purity greater than 99wt% are prepared according to the ratio of Nd24.5Pr6Fe68.4Cu0.1B1, melted in a strip continuous casting furnace of 200-700Kg / time, and cast into alloy sheets at a roll speed of 1.5m / s, The thickness of the alloy sheet is 0.2-0.4mm;

[0055] 2) Put the above-mentioned alloy flakes into a hydrogen treatment furnace for hydrogen crushing, and dehydrogenate at a temperature of 600°C until the hydrogen pressure is less than 10Pa; Grinding to a particle size of <0.5mm, then finely pulverizing through a jet mill, and grading to adjust the particle size distribution to make a powder with an average particle size of d=4μm;

[0056] 3) In an oxygen-free environment under the protection of an inert gas, 3% by weight, with an average particle diameter of 30nm, dispersed nano holmium oxide Ho 2 o 3 The powder is added to the above-mentioned NdFeB powder, and mixed evenly in a mixer.

[0057] 4) Orienting and pressing the uniformly...

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Abstract

The invention discloses a manufacturing method of a high-coercivity R-Fe-B sintered permanent magnet material, which specifically comprises the following steps: blending raw materials according to a certain proportion and casting into an alloy plate with a thickness of 0.1-0.4mm; performing hydrogen decrepitation of the alloy plate and dehydrogenizing to a hydrogen pressure less than 10Pa at a temperature of 400-600 DEG C; sending the alloy plate after hydrogen decrepitation into a mill under the anaerobic environment protected by inert gas, grinding to a grain size less than 0.5mm, micro-grinding with an airflow mill and preparing R-Fe-B alloy powder with a grain size d being equal to 2-4 mum in a classification manner; adding at least one of nano dysprosium oxide, nano terbium oxide andnano holimium oxide with a grain size being less than 100nm into the prepared R-Fe-B alloy powder under the anaerobic environment protected by the inert gas, uniformly mixing, carrying out orientation in a magnetic field of 1.5-3T and pressing into a pressed blank; and carrying out high-temperature sintering for three times and aging treatment for two times in a vacuum sintering furnace under theanaerobic environment protected by the inert gas to prepare a high-coercivity R-Fe-B sintered permanent magnet without size limitation. The manufacturing method has the advantages of simple process and low cost.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials, in particular to a method for manufacturing high coercive force R-Fe-B series sintered permanent magnet materials Background technique [0002] NdFeB permanent magnets are the strongest permanent magnets in contemporary times. They not only have excellent characteristics such as high magnetic energy product and high cost performance, but also are easy to process into various sizes. They have been widely used in aviation, aerospace, micro-blog communication technology, electronic , electroacoustic, electromechanical, computing technology, automation technology, automobile industry, petrochemical industry, magnetic separation technology, instrumentation, magnetic medical technology and other devices and equipment that require permanent magnetic fields, especially suitable for the development of high-performance, miniaturized , Lightweight replacement products. NdFeB p...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C33/02B22F3/16H01F1/057H01F1/08H01F41/02
Inventor 王庆凯李广军杜伟于大勇
Owner YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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