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Heat treatment method of radiation or multi-pole orientation magnet ring

A heat treatment method and magnetic ring technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of unsuitable rare earth permanent magnet products, reduced magnetic performance, low cracking rate, etc., and achieve uniform blank shrinkage, Effect of lowering sintering temperature and improving magnetic properties

Active Publication Date: 2012-07-25
BEIJING ZHONG KE SAN HUAN HI TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, the above two heat treatment systems have great limitations for obtaining magnetic ring products with excellent magnetic properties, good dimensional consistency and low cracking rate (especially for polar anisotropic magnetic rings and thin-walled rings), because it cannot Effectively ensure the consistent shrinkage of the inner and outer circles of the magnetic ring
[0004] Chinese patent applications 200710139441.X and 200520129463.4 mentioned the method of protecting sintering under hydrogen atmosphere, but they are mainly used in the fields of cemented carbide and diamond, and there are special hydrogen sintering furnaces, this method is not suitable for rare earth permanent Magnetic products, the reason is that sintered NdFeB magnets are easy to oxidize, and need to be continuously outgassed during the heat treatment process to remove some impurities in the matrix, so vacuuming is required during the heating process
If the atmosphere sintering is always used, the impurities cannot be removed in time, and will remain in the matrix to form defects such as pores and carbides, which will seriously affect the various properties of sintered NdFeB products, such as significantly reduced magnetic properties and significantly deteriorated mechanical properties, which is not conducive to post-processing

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  • Heat treatment method of radiation or multi-pole orientation magnet ring

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Experimental program
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Effect test

Embodiment 1

[0015] The raw materials whose weight ratio is 19.8%Nd-8.9%Pr-1.3%Dy-0.5%Al-1.0%B-2.0%Co-Fe are melted and cast alloy metal ingots in a vacuum melting furnace, and the metal is crushed with a jaw crusher. The ingot is coarsely crushed, and then crushed by a jet mill to obtain a fine powder with an average particle size of 5 μm. The powder is filled into an orientation forming device and pressed into a radiation orientation magnetic ring with a size specification of Φ46×Φ40×18mm. Then put the magnetic ring product into the graphite material box for sintering in the vacuum sintering furnace. A layer of mixed powder is evenly distributed on the bottom of the material box as a sintering filler, and the composition of the powder is 1wt% DyF 3 , 1wt‰ ammonium chloride, 1wt‰ graphite powder, 2wt% iron powder, 1wt% alumina powder, 2wt‰ zinc stearate, the rest is NdFeB waste powder, the composition is not limited. During the sintering process, after the sintered billet is deflated, wh...

Embodiment 2

[0017] The raw materials whose weight ratio is 22%Nd-8%Pr-1.0%Dy-1.0%B-2.5%Co-Fe are melted and cast alloy metal ingots in a vacuum melting furnace, and the metal ingots are coarsely crushed with a jaw crusher. The fine powder with an average particle size of 5 μm is obtained by crushing with a jet mill, and the powder is filled into an orientation forming device, and pressed into a four-pole 45-degree obliquely charged orientation magnetic ring with a size of Φ26×Φ21×20 mm. Then put the magnetic ring product into the graphite material box for sintering in the vacuum sintering furnace. A layer of mixed powder is evenly distributed on the bottom of the material box as a sintering filler, and the composition of the powder is 2wt% TbF 3 and Pr 2 o 3 , 2wt‰ ammonium chloride, 5wt‰ graphite powder, 8wt% iron powder, 3wt% alumina powder, 6wt‰ calcium stearate, the rest is NdFeB waste powder, the composition is not limited. During the sintering process, after the sintered billet i...

Embodiment 3

[0019] The raw materials whose weight ratio is 21%Nd-8%Pr-1.0%B-1.5%Co-0.5%Al-0.2%Nb-Fe are subjected to high-frequency melting in an argon atmosphere, and the melt is cast into a copper unit The alloy is obtained in the form of thin strips on chilled rolls. Then use the hydrogenation crushing technology to crush the thin strip alloy into coarse powder, and then crush it with a jet mill to obtain a fine powder with an average particle size of 5 μm, fill the powder into an orientation forming device, and press it into ten Six pole orientation magnetic ring. Then put the magnetic ring product into the graphite material box for sintering in the vacuum sintering furnace. A layer of mixed powder is evenly distributed on the bottom of the material box as a sintering filler, and the composition of the powder is 1.5wt% Dy 2 o 3 、Ho 2o 3 and Y 2 o 3 , 1.5wt‰ ammonium chloride, 3wt‰ graphite powder, 5wt% iron powder, 2wt% alumina powder, 4wt‰ barium stearate, the rest is NdFeB wa...

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Abstract

The invention relates to a heat treatment method of radiation or multi-pole orientation magnet ring. The heat treatment method is characterized by comprising the following steps: putting magnet ring sintering blanks into a feed box, which is uniformly distributed with a layer of sintering filler powder at the bottom; placing the feed box into a vacuum sintering furnace; deflating and processing the sintering blanks by atmosphere sintering. The improved heat treatment method can significantly improve the performance of radiation or multi-pole orientation magnet rings, especially thin-walled and polar anisotropy products, and significantly reduces the cracking rate of the magnet ring products, improves the strength thereof, ensures size consistency thereof and reduces operative difficulty of the subsequent processing.

Description

technical field [0001] The invention relates to a production process of a rare-earth iron-based radiation or multi-pole orientation ring magnet, in particular to a heat treatment method that can reduce the cracking rate of a rare-earth iron-based radiation or multi-pole orientation ring magnet. Background technique [0002] The radially radiating or multi-pole oriented annular magnets have broad application prospects in the field of electric motors. In the specific production and preparation process of radiation or multipolar orientation ring, its performance index not only depends on the configuration of alloy components, reasonable pressing and orientation forming process, but also largely depends on the heat treatment process. One of the technical difficulties in making radiation or multipolar orientation rings is the conformal problem in the sintering process caused by radial anisotropy. Due to the Nd 2 Fe 14 The thermal expansion coefficient of B has anisotropy, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16C22C33/02C22C38/00H01F1/057H01F1/08H01F41/02
Inventor 陈国安饶晓雷胡伯平
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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