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Antioxidant for sintering neodymium iron boron jet mill, and use method of antioxidant

An anti-oxidant and NdFeB technology, which is applied in the direction of chemical instruments and methods, electrical components, and chemical change-inhibiting compositions, can solve problems affecting the magnetic properties of products, low orientation, and insufficient lubricity of magnetic powder, etc., and achieve continuous The effect of anti-oxidation

Inactive Publication Date: 2015-03-25
HUNAN AEROSPACE MAGNET & MAGNETO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The following problems exist in the production process of sintered NdFeB permanent magnet materials: 1. The magnetic powder is easily oxidized during the operation of each process; 2. The lubricity of the magnetic powder is not enough during molding, the dispersion of the magnetic powder is uneven, and the degree of orientation is low; 3. , The magnetic powder is agglomerated due to self-aggregation, which affects the magnetic properties of the product
However, the above-mentioned antioxidants are added in a single way, which cannot guarantee the continuous oxidation resistance of NdFeB magnetic powders at all stages of production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Antioxidant for sintered NdFeB jet mill:

[0029] Antioxidants: 50g 1-Cetyl Alcohol and 150g Ethanol;

[0030] Antioxidant additive: a mixture of 300g aviation gasoline and 100g petroleum ether.

[0031] Use of antioxidant for sintered NdFeB jet mill:

[0032] (1) Mix 100g antioxidant with 100kg sintered N38M sintered NdFeBH crushed powder evenly, then push it to jet mill for further crushing to 3.2 micron fine powder; (2) finely mix, add antioxidant additives and Mix the remaining 100g antioxidant; (3) Under 11MPa molding pressure, press it into a cube with a size of 57mm×23mm×47.5mm, and remove the antioxidant in a vacuum sintering furnace at 350°C for 2.5h. Finally, first-stage tempering at 910°C for 2.5 hours, and second-stage tempering at 500°C for 5 hours to obtain a sintered NdFeB blank product, which was polished with a surface grinder, and its oxygen content and magnetic properties were tested, see Table 1.

Embodiment 2

[0034] Antioxidant for sintered NdFeB jet mill:

[0035] Antioxidants: 20g 1-hexadecanol, 20g trityl alcohol, 20g zinc stearate and 150g ethanol;

[0036] Antioxidant additive: a mixture of 150g aviation gasoline and 100g petroleum ether.

[0037] Use of antioxidant for sintered NdFeB jet mill:

[0038] (1) After mixing 65g of antioxidants with 90kg of sintered N38M sintered NdFeBH crushed powder evenly, push them to a jet mill for further crushing to a fine powder of 3.2 microns; (2) Finely mix and add antioxidant additives and Mix the remaining 145g antioxidant; (3) Under 12MPa molding pressure, press into a cube with a size of 57mm×23mm×47.5mm, and remove the antioxidant in a vacuum sintering furnace at 380°C for 2 hours. Finally, first-stage tempering at 910°C for 2.5 hours, and second-stage tempering at 500°C for 5 hours to obtain a sintered NdFeB blank product, which was polished with a surface grinder, and its oxygen content and magnetic properties were tested, se...

Embodiment 3

[0040] Antioxidant for sintered NdFeB jet mill:

[0041] Antioxidants: 20g 1-Cetyl Alcohol, 50g Zinc Stearate and 210g Ethanol;

[0042] Antioxidant additive: a mixture of 200g aviation gasoline and 100g petroleum ether.

[0043] Use of antioxidant for sintered NdFeB jet mill:

[0044] (1) After mixing 170g of antioxidants with 80kg of sintered N38M sintered NdFeBH crushed powder evenly, push them to a jet mill for further crushing to a fine powder of 3.2 microns; (2) Finely mix and add antioxidant additives and The remaining 110g of antioxidant was mixed; (3) Under the molding pressure of 10.5MPa, it was pressed into a cube with a size of 57mm×23mm×47.5mm, and the antioxidant was removed in a vacuum sintering furnace at 320°C for 2 hours. Finally, first-stage tempering at 910°C for 2 hours, and second-stage tempering at 500°C for 5 hours to obtain a sintered NdFeB blank product, which was polished with a surface grinder, and its oxygen content and magnetic properties we...

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Abstract

The invention discloses an antioxidant for a sintering neodymium iron boron jet mill, and a use method of the antioxidant. The antioxidant consists of an antioxidation agent and an antioxidation assistant, wherein the antioxidation agent consists of one or several of 1-cetyl alcohol, trityl alcohol and zinc stearate and alcohol; and the antioxidation assistant is a mixture of aviation gasoline and petroleum ether. The use method comprises the following steps that (1) 30-65% of the total amount of the antioxidation agent and neodymium iron boron magnetic powder are uniformly mixed and then crushed via the jet mill; (2) fine mixing is performed, and the antioxidation assistant and the rest antioxidation agent are added and uniformly mixed; and (3) compression molding is performed and then antioxidant removal treatment is performed. The antioxidant can improve the antioxidation property of the sintering neodymium iron boron magnetic powder, greatly improve the lubricating property and the orientation degree of the magnetic powder, and improve the magnet property. The use method can reduce loss of the antioxidation agent caused by volatilization, and can ensure continuous antioxidation property of the neodymium iron boron magnetic powder in each production stage.

Description

Technical field [0001] The present invention involves an anti -oxidant and its usage method, which specifically involves an air -flow -oxidant and its usage method that produces sintering sintering iron boron permanent magnet materials. Background technique [0002] Soligo many magnetic materials with the most magnetic material of the sintering iron boron boron are by far. In recent years, it has developed very rapidly in recent years. It is widely used in many fields such as electronic information, wind power, new energy and energy -saving motors.Since its inception in 1986, the production technology of sintering iron boron boron has been greatly improved. With the development and the realization of oxygen technology, the domestic technology level has reached the international technology level.There are several problems in the production process of sintering iron boron boron permanent magnet materials: 1. Magnetic powder is easily oxidized during the operation of each process; 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K15/06H01F1/057H01F1/08
Inventor 赵宝宝胡盛青谭春林邓阿涛罗明
Owner HUNAN AEROSPACE MAGNET & MAGNETO
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