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A preparation method of room temperature high magnetic energy product corrosion resistant sintered NdFeB

A high magnetic energy product, NdFeB technology, applied in inductor/transformer/magnet manufacturing, magnetic objects, magnetic materials, etc., can solve the problems of unfavorable corrosion-resistant sintered NdFeB, affecting the magnetic energy product at room temperature, etc., and achieve grain boundary improvement. Ideal effect, lower melting point of grain boundary, excellent corrosion resistance effect

Active Publication Date: 2016-09-21
NANJING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when adding elements to modify the grain boundary, the phase ratio of the grain boundary is often increased, which helps to improve the coercive force, but affects the room temperature magnetic energy product.
Obviously, the existing grain boundary modification technology is not conducive to obtaining high energy product corrosion-resistant sintered NdFeB at room temperature

Method used

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  • A preparation method of room temperature high magnetic energy product corrosion resistant sintered NdFeB

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Prepare a master alloy ingot, the atomic percentage of which is: Nd: 9.0%, Pr: 3.0%, Fe: 81.5%, B: 6.5%, and use the vacuum induction quick-setting casting technology to prepare the master alloy quick-setting casting.

[0019] 2. After the master alloy quick-setting cast sheet is crushed by hydrogen explosion, add 0.5% of gasoline, 3.0% of special antioxidant and 0.1% of lubricant to the powder, mix well, and place in the air flow It is further crushed in the mill to make a powder with an average particle size of 5 μm.

[0020] 3. The powder made by jet milling is placed on the rolling sample stage of the magnetron sputtering equipment used for powder particle coating. Select the alloy target, its atomic percentage composition is: Co: 60%, Al: 20%, Ga: 20%; after the magnetron sputtering system is vacuumed, the target material is sputtered on the rolling sample stage in an argon atmosphere On the powder falling with gravity, the average thickness of the sputtered la...

Embodiment 2

[0025] 1. Prepare a master alloy ingot, the atomic percentage of which is: Nd: 13.5%, Fe: 80.2%, B: 6.3%, and use the vacuum induction quick-setting casting technology to prepare the master alloy quick-setting casting.

[0026]2. After the master alloy quick-setting cast sheet is crushed by hydrogen explosion, add 1.0% of gasoline, 0.5% of special antioxidant and 0.05% of lubricant to the powder, mix well, and place in the air flow It is further crushed in the mill to make a powder with an average particle size of 4 μm.

[0027] 3. The powder made by jet milling is placed on the rolling sample stage of the magnetron sputtering equipment used for powder particle coating. Select the alloy target material, its atomic percentage composition is: Co: 20.0%, Al: 40.0%, Ga: 20.0%, Cu: 10.0%, Nb: 10.0%; The target material components are sputtered on the powder falling with gravity in the rolling sample stage, and the average thickness of the sputtered layer on the surface of the powd...

Embodiment 3

[0032] 1. Prepare a master alloy ingot, the atomic percentage of which is: Nd: 12.5%, Fe: 80.8%, B: 6.7%, and use the vacuum induction quick-setting casting technology to prepare the master alloy quick-setting casting.

[0033] 2. After the master alloy quick-setting cast sheet is crushed by hydrogen explosion, add 1.0% of gasoline, 1.5% of special antioxidant and 0.1% of lubricant to the powder, mix well, and place in the air flow It is further crushed in the mill to make a powder with an average particle size of 3 μm.

[0034] 3. The powder made by jet milling is placed on the rolling sample stage of the magnetron sputtering equipment used for powder particle coating. Select the alloy target, its atomic percentage composition is: Co: 20.0%, Al: 60.0%, Cu: 10.0%, Nb: 5.0%, Ga: 5.0%; The target material components are sputtered on the powder falling with gravity in the rolling sample stage, and the average thickness of the sputtered layer on the surface of the powder is 10nm....

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Abstract

The invention discloses a preparation method of room temperature high magnetic energy product corrosion resistant sintered NdFeB. On the basis of preparing Nd(Pr)-Fe-B alloy powders without heavy rare earth elements such as Dy, using the powder coating process based on magnetron sputtering, Co, Al and Cu, Ga, Nb and other alloying elements At the same time, it is sputtered onto the surface of the airflow mill powder, and the Co and Al elements that increase the electrochemical corrosion potential, the Cu and Nb elements that inhibit the grain growth, and the Ga elements that reduce the melting point of the grain boundary and improve the grain boundary are introduced into the grain boundary. Lowering the temperature of the subsequent heat treatment process inhibits the excessive growth of grains and at the same time makes the alloying elements diffuse moderately near the grain boundaries during the sintering process. The invention obtains high magnetic energy product and excellent corrosion resistance through the control of grain boundary phase ratio and potential, and realizes the preparation of high magnetic energy product corrosion-resistant sintered NdFeB at room temperature.

Description

technical field [0001] The invention relates to a preparation method of a magnetic material, in particular to a preparation method of room-temperature high magnetic energy product corrosion-resistant sintered NdFeB. Background technique [0002] The sintered NdFeB rare earth permanent magnet material prepared by the powder metallurgy process has the highest room temperature magnetic energy product, so it has been widely used in the fields of motors and other fields. The sintered NdFeB material has a main phase and a grain boundary phase, the atomic ratio of the main phase is close to Nd:Fe:B=2:14:1, and the grain boundary phase mainly refers to the neodymium-rich phase. The size, distribution, volume ratio and mutual coupling of the main phase grains determine the magnetic energy product of sintered NdFeB. The proportion and morphology of the grain boundary phase play a decisive role in the coupling of the main phase grains. If the non-magnetic grain boundary phase forms a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02C22C38/00C22C33/02B22F9/04B22F3/16
Inventor 徐锋李伟卢国文陈光朱静陆凤琪
Owner NANJING UNIV OF SCI & TECH
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