Industrial cryogenic production method for neodymium, iron and boron nano-crystalline quick-quenched permanent-magnetic powder

A production method and NdFeB technology are applied in the industrial cryogenic production field of NdFeB nanocrystalline fast quenching permanent magnet powder, which can solve the problems of slow linear speed of rollers and achieve the effect of performance improvement.

Active Publication Date: 2015-06-17
JIANGSU JUXIN MAGNET
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Problems solved by technology

Experiments show that the roller line speed of this technical scheme is too slow, and the molten metal cannot generate strips

Method used

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Embodiment Construction

[0015] An industrial cryogenic production method of NdFeB nanocrystalline quick-quenching permanent magnet powder, comprising a production process of batch smelting, ingot crushing, vacuum quick-quenching, magnetic crushing, crystallization heat treatment, fine crushing, and magnetic property testing.

[0016] The vacuum quick quenching furnace used in the present invention is the advanced equipment of the same kind in China. The quick quenching method is the arc remelting overflow type. The quick quenching metal liquid passes through the molybdenum belt pulley at a linear speed of 21.5 meters per second. The barrel is cooled with normal temperature water and the material is recycled. The cooling water of the molybdenum pulley at the key part is changed from normal temperature water to low temperature water. The water temperature is around 0°C and recycled to maintain a constant temperature. The specific method is to use a 5kw refrigerator to connect a 5 cubic meter water tank ...

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Abstract

A method for industrialized cryogenic production of a rapidly-quenched nanocrystalline permanent magnetic neodymium powder, comprising: ingredient smelting, ingot crushing, vacuum rapid-quenching, magnetic fragmentation, crystallization heat treatment, fine grinding, and a magnetic property-testing process. When vacuum rapid-quenching, an electric arc of a vacuum rapid-quenching furnace is used to heat neodymium to allow same to be molten to generate a liquid metal, and the liquid metal that overflowed is melt-spun by a molybdenum melt-spinning wheel at a linear speed of 21.5 meters per second. Water at room temperature is used to cool a vacuum rapid-quenching furnace body and a material-receiving tank and is recycled, while a cooling water is used to cool the molybdenum melt-spinning wheel. The method is capable of producing great ribbons and is capable of increasing the performance of the magnetic powder.

Description

technical field [0001] The invention relates to the field of magnetic material preparation, in particular to an industrial cryogenic production method of NdFeB nanocrystal quick-quenching permanent magnet powder. Background technique [0002] High-performance NdFeB nanocrystalline quick-quenching permanent magnet powder and bonded magnets have a high yield rate and save limited rare earth resources. They can be processed into arbitrary geometric shapes and sizes and can be multi-pole magnetized, which broadens the application field of products. Bonded NdFeB magnets have many advantages such as good stability to temperature changes and strong oxidation resistance. They are widely used in office automation, household appliances, medical equipment, automobiles, various instruments, various small micro-motors and military, aviation, aerospace field, showing a huge impetus to scientific and technological progress. [0003] The most critical technology for the preparation of Nd...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00H01F1/057B22D11/06C21D1/62C21D6/04
CPCB22F9/04B22F2009/048C22C2202/00H01F1/0571
Inventor 曹江平
Owner JIANGSU JUXIN MAGNET
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