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Rare earth hydride surface coating treating agent, application thereof and method for forming rare earth hydride surface coating

A technology of rare earth hydride and surface coating, which is applied in the direction of magnetic objects, magnetic materials, electrical components, etc., can solve the problems of magnet remanence and magnetic energy product decline, loss of magnet saturation magnetization, and increase in cost of alloy raw materials, etc., to achieve improvement Large coercive force, large diffusion distance, and improved magnetic properties

Inactive Publication Date: 2012-07-04
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.
Secondly, due to the scarcity of Dy and Tb resources, the price is much higher than that of Nd, which will cause a substantial increase in the cost of alloy raw materials

Method used

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  • Rare earth hydride surface coating treating agent, application thereof and method for forming rare earth hydride surface coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Mix 10 g of rare earth praseodymium hydride nanoparticles with an average particle diameter of 10 nanometers and 100 ml of methanol, so that praseodymium hydride is uniformly dispersed in methanol, and prepare a treatment agent for forming a surface coating of praseodymium hydride. The concentration is 0.1 g / ml.

[0014] The sintered NdFeB magnet (see the No. 1 magnet in Table 1 for its magnetic properties) was prepared into a small block with an outer dimension of 7×7×7 mm, and its surface was polished. The treated magnet was immersed in the praseodymium hydride surface coating treatment agent, subjected to ultrasonic treatment for 1 minute, and then air-dried, so that the methanol in the surface coating of the magnet was volatilized. Finally, place the air-dried magnet in a vacuum of 1 x 10 -5 Heat treatment was performed at 550° C. for 2 hours in a heat treatment furnace in Torres. The final magnetic performance parameters of the magnet after treatment are shown i...

Embodiment 2

[0016] Mix 30 g of rare earth NdH nanoparticles with an average particle diameter of 20 nanometers and 100 ml of methanol to uniformly disperse NdH in methanol to prepare a treatment agent for forming a NdH surface coating with a concentration of 0.3 g / ml.

[0017] The sintered NdFeB magnet was prepared into a small piece with an outer dimension of 7×7×7 mm, and its surface was polished. The treated magnet was immersed in the neodymium hydride surface coating treatment agent, subjected to ultrasonic treatment for 1 minute, and then air-dried to make the methanol in the surface coating of the magnet volatilize. Finally, place the air-dried magnet in a vacuum of 1 x 10 -5 Heat treatment was performed at 600°C for 1.5 hours in a heat treatment furnace in Torre. The final magnetic performance parameters of the magnet after treatment are shown in the No. 3 magnet in Table 1.

Embodiment 3

[0019] Mix 50 g of rare earth terbium hydride nanoparticles with an average particle diameter of 100 nanometers and 100 ml of ethanol evenly, so that praseodymium hydride is uniformly dispersed in ethanol, and a treatment agent for forming a surface coating of praseodymium hydride is prepared, and its concentration is 0.5 g / ml.

[0020] The sintered NdFeB magnet (see the No. 1 magnet in Table 1 for its magnetic properties) was prepared into a small block with an outer dimension of 7×7×7 mm, and its surface was polished. The treated magnet was immersed in the terbium hydride surface coating treatment agent, subjected to ultrasonic treatment for 1 minute, and then air-dried to make the ethanol in the magnet surface coating volatilize. Finally, place the air-dried magnet in a vacuum of 1 x 10 -5 Heat treatment was performed at 850°C for 1 hour in a heat treatment furnace in Torres. The final magnetic performance parameters of the magnet after treatment are shown in the No. 3 m...

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Abstract

The invention discloses a rare earth hydride surface coating treating agent, a method for forming a rare earth hydride surface coating and application of the rare earth hydride surface coating treating agent, which are used for improving the coercive force of a sintering NdFeB magnet and belong to the technical field of magnetic materials. The coating treating agent is a colloid solution formed by dispersing rare earth hydride into a methanol or ethanol solvent. The method for forming the rare earth hydride surface coating comprises the following steps of: injecting the treating agent into glassware and soaking a magnet into a solution; carrying out ultrasonic processing on the treating agent containing the magnet so that rare earth hydride in the treating agent is uniformly coated on thesurface of the magnet to form a surface coating with even thickness; taking the magnet provided with the rare earth hydride surface coating out of the solution and volatilizing the solvent in the magnet surface coating in an air drying way to form a coating; and placing the air dried magnet into a vacuum heat treatment furnace and carrying out heat treatment for 0.5-2 hours in a temperature rangeof 500-950 DEG C. The invention can obviously improve the magnetic performance of the magnet, especially the coercive force of the magnet.

Description

technical field [0001] The invention relates to a surface coating treatment agent, in particular to a rare earth hydride surface coating treatment agent and a method for forming a surface coating thereof, which are used for improving the coercive force of a sintered NdFeB magnet and belong 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. At present, with the continuous expansion of the market for rare earth permanent magnet motors, DVD optical heads, computer hard disk drives, voice coil motors, and high-end audio equipment, the market capacity of NdFeB permanent magnets is also increasing. At present, the annual output of sintered NdFeB permanent magnets in the world i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/08H01F41/00B22F1/00
Inventor 岳明刘卫强杨敬山孙浩张东涛张久兴
Owner BEIJING UNIV OF TECH
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