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Method for raising orientation degree of Nd-Fe-B powder particles

A powder particle, nd-fe-b technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of low degree of orientation, unfavorable industrial scale production, and high manufacturing cost, and achieve high degree of orientation and facilitate industrial scale. Production, low cost effect

Inactive Publication Date: 2014-09-10
SINO MAGNETICS TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for improving the degree of orientation of Nd-Fe-B powder particles, thereby overcoming the high manufacturing cost caused by the low degree of orientation of existing sintered Nd-Fe-B permanent magnet materials, which is not conducive to industrialization Drawbacks of mass production

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  • Method for raising orientation degree of Nd-Fe-B powder particles

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Embodiment Construction

[0017] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0018] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations thereof such as "includes" or "includes" and the like will be understood to include the stated elements or constituents, and not Other elements or other components are not excluded.

[0019] In the initial state, multiple Nd-Fe-B powder particles are installed in the mold cavity, and all the Nd-Fe-B powder particles show isotropy to the outside as a whole, and their c-axis is randomly distributed. figure 1 The Nd-Fe-B powder particles A and B shown are two representative particles, the angle between the Nd-Fe-B powder particle A and the external magnetic field H is α, and the Nd-Fe-B powder particle B an...

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Abstract

The invention discloses a method for raising an orientation degree of Nd-Fe-B powder particles. The method comprises the steps of: loading a plurality of Nd-Fe-B powder particles in a mold cavity, applying an external magnetic field on the Nd-Fe-B powder particles in the mold cavity to allow the Nd-Fe-B powder particles to rotate by the action of a magnetostatic torque force and be subjected to a magnetostatic torque which is the same as a torque generated by mechanical resistance and friction among the Nd-Fe-B powder particles, applying vibration waves on the Nd-Fe-B powder particles on the basis of keeping the external magnetic field, allowing the Nd-Fe-B powder particles to be subjected to the action of the magnetostatic torque force of the external magnetic field only when the adjacent Nd-Fe-B powder particles are separated, and therefore, allowing the Nd-Fe-B powder particles to turn to the external magnetic field. According to the method, since the vibration waves are applied on the Nd-Fe-B powder particles, c axes of the Nd-Fe-B powder particle are turned to the external magnetic field more easily, and the orientation degree of magnetic steel is raised.

Description

technical field [0001] The invention relates to the field of rare earth permanent magnet materials, in particular to a method for improving the orientation degree of Nd-Fe-B powder particles. Background technique [0002] At present, the production of sintered Nd-Fe-B permanent magnet materials consists of smelting, hydrogen breaking, powder making, molding, sintering and other processes. The magnetic properties of sintered Nd-Fe-B permanent magnet materials are mainly derived from the tetragonal structure of Nd 2 Fe 14 B matrix phase (commonly known as Nd-Fe-B powder particles). It is a uniaxial crystal, and the c-axis is the easy axis of magnetization. If the angle between the magnetization direction and its easily magnetized c-axis is θ, the remanence of Nd-Fe-B powder particles is Br=u 0 Mscosθ, it can be seen that the smaller the θ angle, the greater the remanence, that is, when magnetized along its easy magnetization axis, the Nd-Fe-B powder particles have the larg...

Claims

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Application Information

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IPC IPC(8): B22F1/00H01F1/057H01F1/06
Inventor 张云黄聚慧
Owner SINO MAGNETICS TECH
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