Preparation method of low-dysprosium corrosion-resistant sintering neodymium iron boron

A NdFeB, corrosion-resistant technology, applied in the field of magnetic material preparation, can solve the problems of affecting corrosion resistance, easy to change the electrochemical corrosion potential of grain boundary phase, etc., and achieve the effect of optimizing corrosion resistance and effective content control

Active Publication Date: 2013-12-18
NANJING UNIV OF SCI & TECH +1
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  • Abstract
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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 th

Method used

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  • Preparation method of low-dysprosium corrosion-resistant sintering neodymium iron boron

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Example Embodiment

[0018] Referring to the accompanying drawings, according to the preparation method of the low dysprosium corrosion-resistant sintered NdFeB according to the present invention, it is based on the magnetron sputtering technology, and the surface of the air mill powder of the micron-scale Nd(Pr)-Fe-B main phase alloy is , Vapor deposition of nanoscale Dy-Co-Al-M alloy to achieve direct introduction of grain boundary alloying elements in sintered NdFeB materials. The atomic percentage composition of the master alloy ingot is: Nd: 9.0-13.5%, Pr: 0-3.0%, Fe: 80.2-81.5%, B: 6.3-6.7%, and the rest are inevitable impurities, which are accelerated by vacuum induction. The master alloy quick-setting cast slabs are prepared by the casting technology; after the master alloy quick-setting slabs are broken by hydrogen explosion, 0.5-1.0% of gasoline and 0.5-3.0% of special antioxidants are added to the powder, which account for the total weight of the master alloy powder. And 0.05-0.1% lubri...

Example Embodiment

[0025] Example 2:

[0026] 1. Prepare a master alloy ingot, its atomic percentage is: Nd: 13.5%, Fe: 80.2%, B: 6.3%, and use the vacuum induction rapid-setting casting technology to prepare the master alloy rapid-setting casting.

[0027] 2. After the mother alloy quick-setting cast pieces are broken by hydrogen explosion, 1.0% gasoline, 0.5% special antioxidant and 0.05% lubricant are added to the powder, which account for the total weight of the alloy powder. It is further crushed in the mill to make powder with an average particle size of 5 μm.

[0028] 3. Place the powder produced by jet milling on the rolling sample stage of the magnetron sputtering equipment used for powder particle coating. Select an alloy target with the atomic percentage composition: Dy: 60.0%, Co: 25.0%, Al: 10.0%, Ga: 5.0%; after the magnetron sputtering system is evacuated, sputter the target components in an argon atmosphere It was sprayed on the powder falling with gravity in the rolling sample...

Example Embodiment

[0032] Example 3:

[0033] 1. Prepare a master alloy ingot, its atomic percentage is: Nd: 12.5%, Fe: 80.8%, B: 6.7%, and use the vacuum induction rapid-setting casting technology to prepare the master alloy rapid-setting casting.

[0034] 2. After the quick-setting cast pieces of the mother alloy are broken by hydrogen explosion, 1.0% gasoline, 1.5% special antioxidant and 0.1% lubricant are added to the powder, which account for the total weight of the alloy powder. After fully mixing, place it in the airflow It is further crushed in the mill to make powder with an average particle size of 4 μm.

[0035] 3. Place the powder produced by jet milling on the rolling sample stage of the magnetron sputtering equipment used for powder particle coating. The alloy target is selected, and 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 evacuated, The target components were sputtered on the p...

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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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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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