Sintered Nd-Fe-B magnet manufacturing method and device

A production method and technology of sintered magnets, which are applied in the field of magnet production, can solve problems such as rising production costs, complicated procedures, low coercive force, squareness, and low heat resistance, and achieve the effect of saving rare earths and materials

Active Publication Date: 2012-12-26
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • 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 prev

Method used

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

Examples

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Embodiment 1

[0017] 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, after the classification step, a mixing step is added to remix the separated ultrafine powder into the finished crushed powder, and enter the subsequent processing process together.

[0018] In the step of increasing the mixing, remixing the previously separated ultrafine powder into the finished pulverized powder is to add a pipeline with a valve between the lower part of the ultrafine powder recovery device and the lower part of the classification device, and control the ultrafine powder through the valve. The ultra-fine powder collected by the powder recovery device is sent to the lower part of the classification device, mi...

Embodiment 2

[0022] A manufacturing method of a sintered neodymium-iron-boron magnet of the present invention is different from the first embodiment in that the step of increasing the mixing is to remix the previously separated ultrafine powder into the finished pulverized powder. The ultra-fine powder collected by the fine powder recovery device and the finished crushed powder collected by the finished powder collection device are taken out separately, and put into a mixer together for mixing according to preset requirements.

[0023] see image 3 As shown, a kind of pulverizing device of the present invention that is used to realize the above-mentioned sintered neodymium-iron-boron magnet manufacturing method is different from Embodiment 1 in that it does not use a pipeline with a valve to connect the ultrafine powder recovery Between the bottom of the device and the bottom of the classification device, a mixer 7 is added to take out the powder collected by the finished powder collection...

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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, after the grading step, a mixing step is added to re-mix the originally separated ultrafine powder into finished crushed powder, and the originally separated ultrafine powder 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, besides, precious rare earth can be saved and extremely high pricing competitiveness is achieved through material conservation.

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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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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