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Sintered Nd-Fe-B magnet manufacturing method and device

A production method and technology of sintered magnets, applied in the field of magnet production, can solve the problems of low coercive force, squareness, low heat resistance, increased production costs, and complicated procedures, so as to prevent abnormal grain growth and reduce production costs , The effect of simplifying the process

Active Publication Date: 2015-03-04
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The lower the oxygen content in sintering, the more likely it is to cause over-sintering, which is more likely to cause abnormal grain growth, and the problems of low coercive force, squareness, and heat resistance are also more significant.
As a well-known improved method, in order to prevent abnormal grain growth, Ga, Zr, Mo, V, W, etc. are usually added at about 0.5% to 1%, but these elements are mostly non-magnetic elements, which not only have complicated processes and production The disadvantage of rising costs, and it is easy to cause the problem of low Br and (BH)max

Method used

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  • Sintered Nd-Fe-B magnet manufacturing method and device

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Embodiment

[0014] A manufacturing method of a sintered neodymium-iron-boron magnet of the present invention is that in the process of manufacturing a Nd-Fe-B system sintered magnet whose oxygen content in the sintered magnet is 2500ppm or less, the oxygen content in the inert gas during pulverization In the process of crushing under the condition of 1000ppm or less, the classification step is removed, so that the original separated ultrafine powder continues to be mixed with the finished crushed powder, and enters the subsequent processing process together.

[0015] The step of removing and grading is to add a filter connected to the compressor through a pipeline in the classification device, and set the filter to block the passage of ultrafine powder, so that the ultrafine powder will not be separated in the classification device, Continue to mix in the finished powder and be collected by the finished powder collection device.

[0016] see figure 2 As shown, a pulverizing device of a ...

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Abstract

The invention discloses a sintered Nd-Fe-B magnet manufacturing method and device. The method comprises the following steps: in the manufacturing procedure of Nd-Fe-B system sintered magnet in which the oxygen content is below 2,500 ppm and in the crushing procedure under the condition that the oxygen content in inert gas is below 1,000 ppm, and the grading step is omitted, so that ultrafine powder which is originally separated is continually mixed in finished crushed powder and enters the follow-up processing procedure together with the finished crushed powder. By adopting the method, in the follow-up sintering procedure, AGG (Abnormal Grain Growth) can not be easily caused in the follow-up sintering procedure, and the characteristics such as simplifying the procedure and lowering the production cost, are achieved.

Description

technical field [0001] The invention relates to the technical field of magnet manufacture, in particular to a manufacturing method and device for a sintered neodymium-iron-boron (Nd-Fe-B) magnet. Background technique [0002] A magnet is an object that can generate a magnetic field. It is a magnetic dipole that can attract ferromagnetic substances such as iron, nickel, cobalt and other metals. Neodymium-iron-boron (Nd-Fe-B) magnet is a kind of magnet. It is the magnet with the highest commercial performance found at present. It is known as the magnet king. It has extremely high magnetic properties and its maximum magnetic energy product (BH )max is more than 10 times higher than ferrite (Ferrite); its own machining performance is also quite good, the working temperature can reach up to 200 degrees Celsius, and its texture is hard, stable performance, and good cost performance, so its application extremely broad. [0003] Nd-Fe-B (Nd-Fe-B) magnets are manufactured in two wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/057H01F7/02B22F9/04
Inventor 永田浩吴冲浒
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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