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Super-high-coercivity neodymium iron boron permanent magnet used for new energy automobile motor and preparation method of permanent magnet

A new energy vehicle and coercive force technology, which is applied in the manufacture of inductors/transformers/magnets, magnetic objects, circuits, etc., can solve problems that cannot meet the performance requirements of new energy vehicle motors, and achieve improved comprehensive magnetic properties and temperature stability sexual effect

Inactive Publication Date: 2018-08-24
ZHEJIANG SHEENSEN MAGNETICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The remanence and maximum energy product of sintered NdFeB permanent magnets have exceeded 96% and 92.6% of their theoretical values ​​respectively; however, their intrinsic coercive force is only 12% of their theoretical values, which cannot meet the needs of new energy vehicle motors. performance requirements

Method used

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  • Super-high-coercivity neodymium iron boron permanent magnet used for new energy automobile motor and preparation method of permanent magnet
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  • Super-high-coercivity neodymium iron boron permanent magnet used for new energy automobile motor and preparation method of permanent magnet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Batching smelting: batching is carried out according to the design formula in table 1, wherein, dysprosium, boron, zirconium, niobium adopt the form of dysprosium iron, boron iron, zirconium iron and niobium iron alloy to add respectively; Every kind of formula prepares 300kg / furnace, Put the prepared raw materials into the cleaned melting crucible of the quick-setting furnace, vacuumize, preheat, fill with argon, and melt, and then pour the alloy onto the copper roller with a roller speed of 2m / s to make an average thickness of 0.3mm quick-setting sheet; turn off the power, and leave the oven after the quick-setting sheet cools down.

[0022] The weight ratio of each component in the design formula of table 1-1

[0023] the element

PrN

Dy

Tb

B

Al

Zr

Nb

C0

Cu

Ga

Fe

Element

21

1

8.5

1

0.5

0.1

0.2

2

0.2

0.1

margin

[0024] (2) Powder making: hydrogen crush t...

Embodiment 2

[0034] The sintering temperature in the sintering and aging process is 1085° C., and other preparation processes are the same as in Example 1. The room temperature magnetic properties and the magnetic properties tested at 200°C of the ultra-high coercive force NdFeB magnets for new energy vehicle motors produced according to the above procedures are shown in Table 2-1 and Table 2-2 respectively.

[0035] Room temperature magnetic properties of ultra-high coercivity NdFeB magnets in Table 2-1 Example 2

[0036]

Embodiment 2

[0039] The 2000 times scanning electron microscope fracture figure of the magnet prepared by the method of embodiment 2 is as follows Figure 1b shown.

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Abstract

The invention relates to a super-high-coercivity neodymium iron boron permanent magnet used for a new energy automobile motor and a preparation method of the permanent magnet. The super-high-coercivity neodymium iron boron permanent magnet is characterized by comprising the alloy components of 18-22% of praseodymium neodymium alloy, 1-2% of dysprosium, 8-12% of terbium, 1-3% of cobalt, 0.1-0.3% ofcopper, 0.2-0.6% of aluminum, 0-0.5% of gallium, 0-0.5% of niobium, 0-0.2% of zirconium, 0.9-1.05% of boron and the balance of iron and a little inevitable impurities in the material; and through reasonable matching of three processes of quick hardening casting, hydrogen demolishing and air flow milling, the sintered neodymium iron boron magnet with intrinsic coercivity of greater than or equal to 40kOe (3,184kA / m) is prepared. The super-high-coercivity neodymium iron boron magnet prepared in the invention has the comprehensive performance (BH)<max>(MGOe)+H<ci>(kOe) of greater than or equal to 75, and the maximum working temperature of 200 DEG C or above, so that the magnetic performance requirement of the current new energy automobile motor on the high-performance sintered neodymium ironboron magnet can be satisfied.

Description

technical field [0001] The invention relates to a magnetic material and a preparation method thereof, in particular to an ultra-high coercivity neodymium-iron-boron permanent magnet for a new energy automobile motor and a manufacturing method thereof. Background technique [0002] New energy vehicles are one of the seven major areas of national strategic emerging industries, and are also a new trend in the international automotive industry. The demand for high-performance NdFeB permanent magnets used in such vehicles will continue to grow. The fastest growth rate is in the application of new energy vehicle motors (including motors and generators), with an annual growth rate of about 20%; the reason is that the magnetic properties and temperature stability of high-performance sintered NdFeB permanent magnet materials Performance and reliability are improved, and it can be used to manufacture motors for various purposes. The development of new energy vehicles (oil-electric hy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0253H01F41/0266
Inventor 周晓庆鲍金胜闫向领鲍恩霞胡志华男顶
Owner ZHEJIANG SHEENSEN MAGNETICS TECH CO LTD