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Method for oxidizing residual crystalline solids of bonded neodymium iron boron rapid-quenching permanent magnetic powder

A technology of permanent magnet powder and NdFeB, which is applied in the direction of magnetic objects, magnetic materials, inorganic materials, etc., can solve the problems of non-ideal amorphous and crystalline powders, and achieve simple and easy operation, enhanced performance and extended use The effect of longevity

Active Publication Date: 2014-08-20
JIANGSU JUXIN MAGNET
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Problems solved by technology

[0002] During the preparation process of bonded NdFeB quick-quenching permanent magnet powder, there are two situations in which crystal particles will be produced. One is the splashing sparks generated in the vacuum quick-quenching process, which splash into the storage barrel; In the initial stage and the final shutdown stage, the molten liquid is not discharged by overflow but by inertial flow, which is also prone to produce unsatisfactory amorphous and crystalline powders

Method used

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Embodiment Construction

[0009] The invention relates to a method for oxidizing residual crystals of bonded NdFeB permanent magnet powder quickly quenched. The crystallized bonded NdFeB permanent magnet powder is humidified by steam to completely oxidize the residual crystals of the bonded NdFeB permanent magnet powder. The oxidizing process flow of the residual crystals of the bonded NdFeB permanent magnet powder includes: feeding-spreading-steam humidification-drying-testing-packaging. Add the NdFeB permanent magnet powder into the hopper, and then spread the material evenly on the conveyor belt through microcomputer control, the paving thickness is 1~1.5mm, and then the conveyor belt sends the material into the oxidation generation chamber at a speed of 0.2m / min. The steam humidification process is completed in the oxidation generation chamber, which is humidified and oxidized under the control of the steam generator. The working temperature in the oxidation generation chamber is 70°C~100°C, and the...

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Abstract

The invention discloses a method for oxidizing residual crystalline solids of bonded neodymium iron boron rapid-quenching permanent magnetic powder. According to the technical scheme, the method includes the steps that neodymium iron boron permanent magnetic powder undergoing crystallization heat treatment is wetted through vapor, and accordingly the crystalline solids left in the neodymium iron boron permanent magnetic powder are completely oxidized. Further, the neodymium iron boron rapid-quenching permanent magnetic powder oxidization procedures include feeding, spreading, humidifying through vapor, drying, blanking, detection and packaging. Further, by means of humidifying through vapor, the neodymium iron boron permanent powder is wet but does not contain liquid water. The method has the following advantages that the method is easy to operate, the neodymium iron boron permanent magnetic powder is humidified through water vapor, the crystalline solids left in the neodymium iron boron permanent magnetic powder are completely oxidized, and manufactured magnets cannot peel or bubble.

Description

technical field [0001] The invention relates to the technical field of preparation of bonded NdFeB permanent magnet powder, in particular to a method for oxidizing residual crystals of bonded NdFeB quick-quenching permanent magnet powder. Background technique [0002] During the preparation process of bonded NdFeB quick-quenching permanent magnet powder, there are two situations in which crystal particles will be produced. One is the splashing sparks generated in the vacuum quick-quenching process, which splash into the storage barrel; In the initial stage and the final shutdown stage, the molten liquid is not discharged by overflow but by inertial flow, which is also prone to produce unsatisfactory amorphous and crystalline powders. These two types of non-artificially produced micro-particles will appear peeling or blistering when they are made into magnetic products for aging tests. Contents of the invention [0003] In order to solve the problems existing in the above-...

Claims

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Application Information

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IPC IPC(8): B22F1/00H01F1/057H01F1/08
Inventor 曹江平邵伯渊
Owner JIANGSU JUXIN MAGNET
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