Preparation method of low dysprosium corrosion-resistant sintered NdFeB

A neodymium-iron-boron and corrosion-resistant technology is applied in the field of preparation of magnetic materials, which can solve the problems of easily changing the electrochemical corrosion potential of grain boundary phase and affecting corrosion resistance, and achieve the effects of optimizing corrosion resistance and effective content control.

Active Publication Date: 2016-03-23
NANJING UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, due to the limitation of surface diffusion depth, it is only suitable for ultra-thin magnets with a thickness of less than 5mm
However, this method only introduces Dy element at the grain boundary, and fails to control the content of other alloying elements such as Co, Al, Ga, Cu, Nb in the magnet at the same time, which easily changes the electrochemical corrosion potential of the grain boundary phase, thereby affecting the corrosion resistance.

Method used

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  • Preparation method of low dysprosium corrosion-resistant sintered NdFeB

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 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.

[0020] 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 6 μm.

[0021] 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: Dy: 80%, Co: 15%, Al: 5%; after the magnetron sputtering system is evacuated, 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

[0026] 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.

[0027] 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 5 μm.

[0028] 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: Dy: 60.0%, Co: 25.0%, Al: 10.0%, Ga: 5.0%; after the magnetron sputtering system is evacuated, the target components are sputtered in an argon atmosphere Sputtered on the powder falling with gravity in the rolling sample stage, the average thickne...

Embodiment 3

[0033] 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.

[0034] 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 4 μm.

[0035] 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: Dy: 40.0%, Co: 20.0%, Al: 30.0%, Cu: 2.0%, Nb: 3.0%, Ga: 5.0%; after the magnetron sputtering system is vacuumed, In an argon atmosphere, the target material components are sputtered on the powder falling with gravity in the rolling sample stage, a...

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Abstract

The invention discloses a preparation method of low-dysprosium corrosion-resistant sintering neodymium iron boron. According to the preparation method, Dy, Co, Al and alloy elements such as Cu, Ga and Nb are sputtered on the surface of airflow grinding powder by utilizing a magnetron sputtering-based powder coating process on the basis of preparing Nd(Pr)-Fe-B alloy powder, crystal boundary modified elements such as Co, Al, Cu, Ga and Nb are introduced while the Dy element is introduced into crystal boundary, and the temperature of the subsequent heat treatment process is reduced, so that the alloyed elements are dispersed properly near the crystal boundary in a sintering process, coercivity is improved, the Dy content is reduced, the corrosion resistance of a magnet is effectively improved, and preparation of the low-dysprosium corrosion-resistant sintering neodymium iron boron is realized.

Description

technical field [0001] The invention relates to a preparation method of a magnetic material, in particular to a preparation method of low-dysprosium corrosion-resistant sintered NdFeB. Background technique [0002] The sintered NdFeB rare earth permanent magnet material prepared by powder metallurgy has the highest room temperature magnetic energy product and remanence. 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. There are two main application bottlenecks in sintered NdFeB: 1. The temperature coefficient of magnetic properties is high, which means that the excellent room temperature permanent magnetic properties will decay rapidly with the increase of temperature, and the high temperature magnetic properties are poor, and the maximum working temperature is relatively low. Low; Second, the corrosion resistance is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/08C23C14/35C23C14/16B22F1/02C21D1/18C21D1/773
Inventor 徐锋张玄卢国文陈光朱静陆凤琪
Owner NANJING UNIV OF SCI & TECH
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