A kind of sintering process of neodymium iron boron

A NdFeB technology, which is applied in the field of NdFeB sintering technology, can solve the problems of product performance, magnetic performance degradation, long time-consuming secondary deflation, and fast discharge speed, so as to improve magnetic performance, avoid adverse effects, The effect of fast emission

Active Publication Date: 2019-08-20
ZHEJIANG DONGYANG DMEGC RARE EARTH MAGNET CO LTD
View PDF1 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the secondary degassing takes a long time and consumes a lot of energy during the sintering process in the current technology, and the product is in a low vacuum state for a long time, which will easily reduce the product performance, especially the magnetic performance. The discharge speed is fast, the sintering process is short, and the sintering process of NdFeB magnets with high performance

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of sintering process of neodymium iron boron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of NdFeB finished product is sintered in the following steps:

[0039](1) Compacting step: Put the sintered NdFeB powder into the forming press for orientation forming and pressing to obtain the required specification blank, and perform isostatic pressing secondary molding process to increase the density of the blank, under the condition of gas protection , put the blank into the prepared high temperature resistant material model to obtain the NdFeB magnet compact;

[0040] (2) Step into the furnace: put the NdFeB magnet compact into the material holder, put the NdFeB magnet compact together with the material holder into the sintering space in the furnace, the material holder and the material The trays are staggered, leaving a gap between the trays;

[0041] (3) Decarburization step: use a vacuum pumping unit to evacuate until the air pressure in the furnace is 0.5Pa, then raise the temperature to make the temperature in the furnace reach 400°C, the heating time...

Embodiment 2

[0047] A kind of NdFeB blank product is sintered in the following steps:

[0048] (1) Compacting step: Put the sintered NdFeB powder into the forming press for orientation forming and pressing to obtain the required specification blank, and perform isostatic pressing secondary molding process to increase the density of the blank, under the condition of gas protection , put the blank into the prepared high temperature resistant material model to obtain the NdFeB magnet compact;

[0049] (2) Step into the furnace: put the NdFeB magnet compact into the material holder, put the NdFeB magnet compact together with the material holder into the sintering space in the furnace, the material holder and the material The trays are staggered, leaving a gap between the trays;

[0050] (3) Decarburization step: use a vacuum pumping unit to evacuate until the air pressure in the furnace is 0.5 Pa, then raise the temperature to make the temperature in the furnace reach 450 ° C, the heating tim...

Embodiment 3

[0056] A kind of NdFeB blank product is sintered in the following steps:

[0057] (1) Compacting step: Put the sintered NdFeB powder into the forming press for orientation forming and pressing to obtain the required specification blank, and perform isostatic pressing secondary molding process to increase the density of the blank, under the condition of gas protection , put the blank into the prepared high temperature resistant material model to obtain the NdFeB magnet compact;

[0058] (2) Step into the furnace: put the NdFeB magnet compact into the material holder, put the NdFeB magnet compact together with the material holder into the sintering space in the furnace, the material holder and the material The trays are staggered, leaving a gap between the trays;

[0059] (3) Decarburization step: use a vacuum pumping unit to evacuate until the air pressure in the furnace is 0.5Pa, then raise the temperature to make the temperature in the furnace reach 380°C, the heating time i...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to the technical field of permanent magnet material production. The invention provides a sintering process for neodymium iron boron, which comprises the following steps of: executing a blank pressing step, i.e., placing sintered neodymium iron boron powder into a forming press to carry out orientation forming pressing to obtain a required standard blank, carrying out the isostatic pressure secondary forming process to improve a density of the blank, and in a gas protection state, placing the blank into a prepared high-temperature resistance material model to obtain a neodymium iron boron magnet pressed blank; placing the neodymium iron boron magnet pressed blank into a furnace, and then sequentially carrying out decarbonization in different temperature environments; carrying out degassing; and carrying out presintering and sintering processing, and finally, after cooling and tempering, obtaining a neodymium iron boron magnet finished blank. The invention, compared with the prior art, provides the sintering process for a neodymium iron boron magnet, which is high in discharge speed of gas absorbed to the surfaces of blank powder particles, short in sintering process and high performance of the obtained neodymium iron boron magnet. The sintering process is helpful for improving production efficiency and saving production cost.

Description

technical field [0001] The invention relates to the technical field of permanent magnet material production, in particular to a sintering process of neodymium iron boron. Background technique [0002] NdFeB magnets are the third-generation rare earth permanent magnet materials with excellent comprehensive performance. Compared with ordinary magnets, this type of permanent magnet has a very large magnetic energy product and coercive force, high cost performance, and more abundant raw materials. Therefore, this type of material is widely used in computers. , Power generation, automobiles, aerospace and many other fields have been widely used. [0003] At present, the hydrogen explosion process is mostly used to process the raw materials of NdFeB magnets. This process plays an important role in improving the efficiency of powder making and preventing the oxidation of magnetic powder. The hydrogen explosion process is the hydrogen absorption process of NdFeB raw materials under...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057B22F3/02B22F3/04B22F3/10B22F3/24
Inventor 李润锋王军强韩飞飞
Owner ZHEJIANG DONGYANG DMEGC RARE EARTH MAGNET CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap