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Nanometer rare earth permanent magnetic material with high-temperature stability and preparation method thereof

A permanent magnet material and nano-rare earth technology, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of limiting the scope of use of magnets, unfavorable promotion and application, and low operating temperature, so as to reduce the performance of magnets and inhibit nucleation Grow up, performance-enhancing effects

Inactive Publication Date: 2014-02-05
江西江钨稀有金属新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent uses too many strategic resources Co, which will increase the cost and is not conducive to popularization and application
[0003] The disadvantages of the existing NdFeB permanent magnet alloys are low magnetic properties, poor thermal stability, and low operating temperature, which are not conducive to use in high temperature environments, such as motors, sensors and other components, and the magnetic properties of the magnets will be affected by heat or environmental conditions. The temperature is increased and greatly reduced, even leading to component failure, thus limiting the scope of use of the magnet

Method used

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  • Nanometer rare earth permanent magnetic material with high-temperature stability and preparation method thereof
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  • Nanometer rare earth permanent magnetic material with high-temperature stability and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0018] According to the following formula, the purity of Nd is 99.9%, the atomic percentage is 29%, the Fe-B alloy (in which B content is 19%), the atomic percentage of B is 2.8%, the atomic percentage of Nb is 4.2%, and the rest is Fe content . Under the protection of the inert gas argon, put it into a vacuum smelting furnace for smelting to obtain 50 kilograms of alloy ingots with uniform composition, and then the obtained alloy ingots are subjected to rapid quenching (see image 3 ), the wheel speed is about 20-39m / s, and after obtaining the thin metal strip, it is crushed through a 40-mesh sieve, crystallized at a temperature of 500°C-700°C for 10 minutes, and the prepared sample is used with a vibrating sample magnetometer (VSM) Measure its magnetic performance, performance as shown in table 1:

[0019] Table 1

[0020]

[0021] It can be seen from the data in Table 1 that rare earth permanent magnet materials can obtain products with high coercive force and a maximu...

Embodiment 2

[0023] According to the following formula, the purity of Nd is 99.9%, the atomic percentage is 24%, the Fe-B alloy (in which B content is 19%), the atomic percentage of B is 3.5%, the atomic percentage of Nb is 4.8, and the rest is Fe content. Repeat the preparation process of sample 1, and measure the magnetic properties of the prepared sample with a vibrating sample magnetometer (VSM), and the performance is as shown in Table 2:

[0024] Table 2

[0025]

[0026] It can be seen from the data in Table 2 that rare earth permanent magnet materials can obtain products with high coercive force and a maximum working temperature of 150-180°C when the magnetic energy product BH(max) maintains good performance.

Embodiment 3

[0028] According to the following formula, the purity of Nd is 99.9%, the atomic percentage is 22.6%, the Fe-B alloy (in which B content is 19%), the atomic percentage of B is 3.8%, the atomic percentage of Nb is 5.2%, and the rest is Fe content . Repeat the preparation process of sample 1, and measure the magnetic properties of the prepared sample with a vibrating sample magnetometer (VSM), and the performance is as shown in Table 3:

[0029] table 3

[0030]

[0031] It can be seen from the data in Table 3 that rare earth permanent magnet materials can obtain products with high coercive force and a maximum working temperature of 150-180°C when the magnetic energy product BH(max) maintains good performance.

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Abstract

A nanometer rare earth permanent magnetic material with the high-temperature stability is characterized in that a basic expression is RxFe100-x-z-y BzNy, wherein R is one or a plurality of lanthanide series rare earth elements of neodymium, praseodymium and the like, Fe is an iron element, B is an boron element, N is one of elements of niobium, zirconium and the like, x is a number ranging from 15 to 36, z is a number ranging from 2 to 10, and y is a number ranging from 4 to 10. Preferentially, x is a number ranging from 18 to 32, z is a number ranging from 2.6 to 8.5, and y is a number ranging from 4.8 to 9. The invention further provides a preparation method of the rare earth permanent magnetic material. A Co element is not added, and the material has the advantages of being low in cost and high in working temperature and intrinsic coercivity.

Description

technical field [0001] The invention relates to a nano-rare earth permanent magnet material with high temperature stability, more specifically, to a bonded NdFeB nano-rare earth permanent magnet material with low cost, high working temperature and high intrinsic coercive force. Background technique [0002] Nano-rare earth permanent magnet materials bonded with NdFeB have been extensively studied and valued due to their high performance and low cost. However, the Curie temperature of such materials is generally low, and their application in high temperature environments is greatly restricted. , For example, various motors and sensors require their working temperature to be around 130-150°C, while in the field of the automobile industry, their working temperature is required to be between 150-180°C. To expand its scope of application, many studies have added Co~Dy, Co~Ga on the basis of NdFeB to form a new type of composite permanent magnet material, such as in the patent "A ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08B22F3/16
Inventor 陈鑫杨安郭蓓
Owner 江西江钨稀有金属新材料股份有限公司
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