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Neodymium iron boron magnet sintering method and special device thereof

A sintering method and NdFeB technology, applied in the direction of magnetic objects, magnetic materials, inorganic materials, etc., can solve the problems of poor consistency of magnetic properties of magnets, and achieve uniform magnetic properties, good blank density consistency, and uniform dimensional shrinkage. Effect

Pending Publication Date: 2018-05-08
YANTAI DONGXING MAGNETIC MATERIALS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention mainly solves the problem of poor consistency of the magnetic properties of the existing NdFeB magnet sintering method

Method used

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  • Neodymium iron boron magnet sintering method and special device thereof
  • Neodymium iron boron magnet sintering method and special device thereof
  • Neodymium iron boron magnet sintering method and special device thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Example 1, taking a billet whose performance grade is N40SH sintered NdFeB material and whose specification is 60×43×36 (mm) as an example, its preparation includes the following process steps:

[0021] 1) Loading: Place the pressed N40SH compacts in the material box, the gap between the compacts is less than 1mm, after the material box is full of compacts, cover the material box cover, the material box and the material box cover form the material box tooling;

[0022] 2) Furnace entry: arrange the tooling boxes full of NdFeB compacts in sequence in the cavity of the rotary sintering furnace, and stack them; the stacking is composed of stacked tooling boxes loaded with NdFeB compacts;

[0023] 3) Sintering: According to the set rotation speed and sintering process of the rotary sintering furnace cavity, the compact is sintered into a NdFeB magnet; the rotation speed is 5rpm, and the sintering process is: a sintering temperature of 300°C for the first stage, a holding ti...

Embodiment 2

[0031] Example 2, taking a sintered NdFeB material with performance grade N42SH and a square billet with a specification of 100×80×30 (mm) as an example, its preparation includes the following process steps:

[0032] 1) Loading: Place the pressed N42SH compacts in the material box, the gap between the compacts is less than 1mm, after the material box is full of compacts, cover the material box cover, the material box and the material box cover form the material box Tooling;

[0033] 2) Furnace entry: arrange the tooling boxes full of NdFeB compacts in sequence in the cavity of the rotary sintering furnace, and stack them; the stacking is composed of stacked tooling boxes loaded with NdFeB compacts;

[0034] 3) Compact sintering: According to the set rotation speed and sintering process of the chamber of the rotary sintering furnace, the compact is sintered into an NdFeB magnet; the rotation speed is 16rpm, and the sintering process is: a sintering temperature of 450°C for the ...

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Abstract

The invention discloses a neodymium iron boron magnet sintering method and a special device thereof, and belongs to the technical field of rare earth magnet materials. The sintering method is characterized in that magnets are sintered by the aid of a rotary sintering furnace, the sintering method includes the steps: feeding; placing magnet into the furnace; magnet sintering. The sintering method solves the problems that different positions of a traditional sintering furnace have temperature deviations, density of the sintered blanks at different positions is nonuniform, and the uniformity of the magnetic performance of the sintered blanks is poor. The method is high in applicability and can meet sintering and forming of neodymium iron boron pressed blanks with different specifications.

Description

Technical field: [0001] The invention relates to the technical field of production of permanent magnet materials, in particular to a sintering method of an NdFeB magnet and a special device thereof. Background technique: [0002] With the rapid development and technological progress of hybrid vehicles and pure electric vehicles worldwide, higher requirements are placed on the performance and consistency of sintered NdFeB magnets. The traditional sintering process of NdFeB magnets is that the billet is fixed in the sintering furnace, the heating elements are distributed around the billet, and the heat radiation is used for heating. This traditional method of sintering is likely to cause different temperatures in different areas in the area where the billet is placed. That is, where the temperature is uneven and the regional temperature is low, the sintering shrinkage of the billet is not in place, the porosity of the magnet is high, and the sintering density is low, resulting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08B22F3/10F27B5/04F27B5/06F27B5/14
CPCH01F1/0577F27B5/04F27B5/06F27B5/14B22F3/003B22F3/1007B22F2999/00B22F2201/20
Inventor 刘晓通
Owner YANTAI DONGXING MAGNETIC MATERIALS INC
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