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Nano composite NdFeB (neodymium iron boron) permanent magnetic material and preparation method

A nano-composite, NdFeB technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of easy powder corrosion, poor temperature characteristics, low coercivity of NdFeB magnets, etc. Good performance, improved machinability, and obvious effect of nano-enhancing and toughening

Active Publication Date: 2016-06-22
HUBEI ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the shortcomings of the existing NdFeB magnets such as small coercive force, poor temperature characteristics, and easy pulverization and corrosion, the present invention provides a nanocomposite NdFeB magnet material and a preparation method, using the first mesoporous material to modify Nd The iron boron magnet material has the advantages of simple processing technology, uniform crystal structure, strong coercive force and good temperature resistance of the magnet material

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  • Nano composite NdFeB (neodymium iron boron) permanent magnetic material and preparation method

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Embodiment 1

[0026] A preparation method of nanocomposite NdFeB permanent magnet material, the steps are as follows:

[0027] (1) earlier powder raw material Pr-Nd alloy (wherein Nd content 20wt%) 300kg, B15kg, metal Fe669.5kg, Cu0.5kg, Co0.5kg, Ga0.5kg (each component metal powder particle diameter is in 100-500nm between) under the hydrogen pressure of 0.6Mpa, absorb hydrogen for 2 hours, and then dehydrogenate for 4 hours at a temperature of 650 ° C; after dehydrogenation, cool to 25 ° C, and the powder raw materials are sintered at high temperature and then agglomerated into a particle size of 90-140 mesh coarse granule spare;

[0028] (2) Grind the above-mentioned coarse particles to a fine powder with an average particle size of 3.0 μm under a working pressure of 0.12-0.18Mpa with a jet mill; then, add 0.5kg particle size Mesoporous silica of 100-200nm and pore size of 6-20nm, and stirred and mixed in a mixer for 3 hours, so as to realize the uniform adsorption of nano-additives in ...

Embodiment 2

[0031] A preparation method of nanocomposite NdFeB permanent magnet material, the steps are as follows:

[0032] (1) First put the powder raw material Pr-Nd alloy (wherein the Nd content is 30wt%) 280kg, B20kg, metal Fe696.8kg, Cu1kg, Co1kg, Ga1kg (the particle size of each component metal powder is between 100-500nm) at 1.0Mpa Under the pressure of hydrogen, absorb hydrogen for 3 hours, and then dehydrogenate for 7 hours at a temperature of 700 ° C; after dehydrogenation, cool to 25 ° C, and the powder raw materials are sintered at high temperature and then agglomerated into coarse particles with a particle size of 90-140 mesh for later use;

[0033] (2) Grind the above-mentioned coarse particles into a fine powder with an average particle size of 4.0um under a working pressure of 0.12-0.18Mpa with a jet mill; then, in a helium protective atmosphere, add 0.2kg of particles Mesoporous silicon carbide with a diameter of 50-100m and a pore diameter of 10-20nm is stirred and mixe...

Embodiment 3

[0036] A preparation method of nanocomposite NdFeB permanent magnet material, the steps are as follows:

[0037] (1) earlier powder raw material Pr-Nd alloy (wherein Nd content 40wt%) 220kg, B30kg, metal Fe747.1kg, Cu0.4kg, Co0.4kg, Ga1kg (each component metal powder particle size is between 100-500nm ) under a hydrogen pressure of 0.8Mpa, absorb hydrogen for 5 hours, and then dehydrogenate for 3 hours at a temperature of 430°C; after dehydrogenation, cool to 25°C, and the powder raw materials are sintered at high temperature and then agglomerated into coarse particles with a particle size of 90-140 mesh for later use (2) the above-mentioned coarse particles are ground to a fine powder with an average particle diameter of 3.0um under a working pressure of 0.12-0.18Mpa with a jet mill; then, in a helium protective atmosphere, compoundly add 1.1kg Mesoporous boron carbide with a particle size of 30-90nm and a pore size of 3-9nm is stirred and mixed in a mixer for 4 hours, so tha...

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Abstract

The invention relates to a nano composite NdFeB (neodymium iron boron) permanent magnetic material and a preparation method. The NdFeB permanent magnetic material consists of NdFeB alloy and an additive, wherein the additive is mesoporous silica, mesoporous silicon carbide or mesoporous boron carbide; the content of the mesoporous material accounts for 0.01 weight percent to 2 weight percent of the mass of the nano composite NdFeB permanent magnetic material. The invention further provides the preparation method of the NdFeB permanent magnetic material, which comprises the following steps: preparing coarse particles of a presintered main alloy material; grinding the coarse particles into fine powder with a specification of 1.0 to 5.0mum via air flow; adding the additive into the powder in a jet manner so as to implement uniform adsorption of the mesoporous material on the NdFeB main alloy. According to the NdFeB permanent magnetic material prepared according to the preparation method provided by the invention, addition of the mesoporous material in the main alloy can take effects of improving a coercive force (Hcj) and raising a working temperature under the condition of guaranteeing residual magnetism and a magnetic energy product to be basically unchanged; the product is uniformly dispersed; nano-reinforcing and nano-toughening effects are obvious; the machining property is well improved.

Description

technical field [0001] The invention relates to the field of magnetic materials, in particular to a neodymium-iron-boron permanent magnet material and a preparation method thereof. Background technique [0002] NdFeB permanent magnet materials, as the latest result of the development of rare earth permanent magnet materials, are called "Magnetic King" because of their excellent magnetic properties. NdFeB permanent magnet material is an alloy of neodymium, iron, boron, etc., also known as magnetic steel. NdFeB has extremely high magnetic energy product and coercive force, and the advantages of high energy density make NdFeB magnetic materials widely used in modern industry and electronic technology, so that instruments, electroacoustic motors, magnetic separation Miniaturization, weight reduction, and thinning of equipment such as magnetization are possible. [0003] NdFeB contains a large amount of rare earth elements neodymium, iron and boron, and its characteristics are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08B22F1/00B22F3/10
CPCB22F1/0003B22F3/1007B22F2201/20H01F1/0571H01F1/0575
Inventor 杜军戴洪湖汪连生王锋丁瑜郭连贵覃彩芹
Owner HUBEI ENG UNIV
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