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Treating agent and electro-deposition method for forming rare earth hydride particle coating

A rare earth hydride and treatment agent technology, applied in coatings, circuits, electrolytic coatings, etc., can solve the loss of magnet saturation magnetization, the thickness and distribution uniformity of hydride nanoparticle coatings are difficult to control, and the coating effect is unstable. And other issues

Active Publication Date: 2014-02-05
BEIJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this is an effective way to achieve industrialization, it has the following disadvantages: First, the addition of Dy or Tb will lose the saturation magnetization of the magnet, resulting in a decrease in the remanence and energy product of the magnet.
However, this invention has two technical deficiencies: First, the technology is difficult to control the thickness and distribution uniformity of the hydride nanoparticle coating, so the coating effect is unstable, which in turn affects the magnetic properties of the final magnet
Second, the technology is manual and the work efficiency is low

Method used

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  • Treating agent and electro-deposition method for forming rare earth hydride particle coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Mix 20 g of rare earth dysprosium hydride particles with a particle diameter of 100 nanometers and 1000 ml of n-heptane solution evenly, so that dysprosium hydride is uniformly dispersed in n-heptane, and electromagnetic stirring is used to ensure that the concentration of each place in the electrolytic cell is consistent. The concentration of the suspension that forms the dysprosium hydride particle coating is 0.02 g / ml (since the volume of the obtained suspension is basically the same as that of the dispersant, the same below).

[0015] The sintered NdFeB magnet (see the No. 1 magnet in Table 2 for its magnetic properties) was prepared into a small piece with an outer dimension of 10×10×3.5 mm, and its surface was polished. Connect the processed magnet to the cathode, and the anode uses a stainless steel sheet with an area slightly larger than the area facing the magnet. The distance between the cathode and the anode is controlled at about 2.5cm, the electrodeposition ...

Embodiment 2

[0017] Mix 10 g of rare earth terbium hydride particles with a particle diameter of 100 nanometers and 1000 ml of n-heptane solution evenly, so that terbium hydride is evenly dispersed in n-heptane, and electromagnetic stirring is used to ensure that the concentration of each place in the electrolytic cell is consistent. A suspension of terbium hydride particle coating was formed at a concentration of 0.01 g / ml.

[0018] The sintered NdFeB magnet (see the No. 1 magnet in Table 2 for its magnetic properties) was prepared into a small piece with an outer dimension of 10×10×3.5 mm, and its surface was polished. Connect the processed magnet to the cathode, and the anode uses a stainless steel sheet with an area slightly larger than the area facing the magnet. The distance between the cathode and the anode is controlled at about 2.5cm, the electrodeposition voltage is controlled at 150v, the electrodeposition current is controlled at 40mA, and after 220 seconds of electrodeposition ...

Embodiment 3

[0020] Evenly mix 60 g of rare earth praseodymium hydride particles with a particle diameter of 150 nanometers and 1000 ml of n-heptane solution, so that praseodymium hydride is evenly dispersed in n-heptane, and electromagnetic stirring is used to ensure that the concentration in the electrolytic cell is consistent everywhere, and the preparation for A suspension of the praseodymium hydride particle coating was formed at a concentration of 0.06 g / ml.

[0021] The sintered NdFeB magnet (see the No. 1 magnet in Table 2 for its magnetic properties) was prepared into a small piece with an outer dimension of 10×10×3.5 mm, and its surface was polished. Connect the processed magnet to the cathode, and the anode uses a stainless steel sheet with an area slightly larger than the area facing the magnet. The distance between the cathode and the anode is controlled at about 2.5cm, the electrodeposition voltage is controlled at 150v, and the electrodeposition current is controlled at 40mA....

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Abstract

The invention relates to a treating agent and an electro-deposition method for forming a rare earth hydride particle coating, and belongs to the technical field of magnetic materials. Rare earth hydride particles are dispersed in a dispersing agent, wherein n-hexane or n-heptane is taken as the dispersing agent; the rare earth is at least one element of Pr, Nd, Tb, Dy and Ho. The hydride particles are deposited on the surface of a sintered NdFeB rare earth magnet by using the electro-deposition method so as to form the uniform and dense coating with controllable thickness. The rare earth hydride particle coating can be used for obviously improving the magnetic property of the sintered NdFeB rare earth magnet and especially the coercivity of the magnet. As the method is adopted, the usage amounts of heavy rare earths in the sintered NdFeB rare earth is decreased on the premise of guaranteeing good magnetic property of the magnet, so that the manufacturing cost of the magnet with high coercivity is reduced.

Description

technical field [0001] The invention relates to a new method for forming a rare earth hydride particle coating, which is used for improving the coercive force of a sintered neodymium-iron-boron (NdFeB) magnet, and belongs to the technical field of magnetic materials. Background technique [0002] Sintered NdFeB is the most magnetic permanent magnet material so far. It is widely used in many fields such as electronics, electromechanical, instrumentation and medical treatment. It is the fastest growing permanent magnet material with the best market prospect in the world today. However, the temperature stability of sintered NdFeB is poor, and the working temperature is usually lower than 100°C, so the application in high-temperature motors and other fields is greatly limited. In recent years, hybrid electric vehicles (HEV) have developed rapidly due to their advantages in energy saving and environmental protection. As a key component, permanent magnet motors have once again put...

Claims

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Application Information

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IPC IPC(8): C25D15/00H01F1/057
Inventor 岳明刘卫强常诚米哈路清梅吴丹张东涛左铁镛
Owner BEIJING UNIV OF TECH
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