Sintered rare earth permanent magnetic material and preparation method thereof

A rare-earth permanent magnet and non-rare-earth technology, which is applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of magnet deformation, material waste, and can only reach the millimeter level, so as to improve coercive force and high processing efficiency , The effect of saving materials

Active Publication Date: 2013-03-27
YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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  • Description
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Problems solved by technology

[0009] The above-mentioned "grain boundary infiltration" technology is all carried out on the sintered Nd-Fe-B permanent magnet material after the heat treatment is completed. The depth of Dy and Tb diffusion along the grain boundary is limited to a certain extent, and generally can only reach the millimeter level (see Publication No. CN101404195); In addition, when the "grain boundary infiltration" technology is used for infiltration treatment, the magnet needs to be heated to a certain temperature. Generally, the Nd-rich phase in the magnet needs to be higher than 600°C to form a liquid phase. The magnet has been exposed to this high temperature for a long time. It will cause deformation, and secondary reprocessing is required to meet the size and shape requirements, resulting in material waste

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  • Sintered rare earth permanent magnetic material and preparation method thereof
  • Sintered rare earth permanent magnetic material and preparation method thereof
  • Sintered rare earth permanent magnetic material and preparation method thereof

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preparation example Construction

[0033] The preparation method of sintered rare earth permanent magnet material of the present invention is:

[0034] 1) Material preparation: Provide raw materials with a purity greater than 99wt%, and perform shot blasting for 10-60 minutes to clean the oxide layer on the surface to further improve the quality of raw materials.

[0035] 2) Batching: Batching is carried out in proportion, and the proportion of ingredients can be expressed as R in weight percentage x T y B z Fe （100-x-y-z） , wherein R represents at least one of the rare earth elements including Sc, Dy, Tb, Ho, Gd and Y, and x represents the weight percentage of R, specifically 27wt%<x≤31wt%, preferably 28wt%<x ≤30.5wt%, more preferably 29wt%<x≤30wt%; if the weight percentage of R is too high, it is not conducive to improving the remanence of the magnet, and if it is too low, it needs to increase the sintering temperature, resulting in the increase of infiltrated elements into the main phase, causing remanenc...

Embodiment 1

[0051] Adopt formula weight percentage as R x T y B z Fe （100-x-y-z） formula, where x=29.5%, z=0.95%, grain boundary infiltration is carried out between smelting and coarse crushing, the infiltration element is Dy, and the infiltration weight percentage is 0.7%.

[0052] First select raw materials with a purity greater than 99wt%, and perform shot blasting for 10 to 60 minutes, according to the weight percentage of the formula (Nd+Pr) 29.5 (Co 0.4 Cu 0.1 Ga 0.1 Al 0.1 Zr 0.12 )B 0.95 Fe 68.73Ingredients, the prepared raw materials are melted in the vacuum strip billet continuous casting furnace. When the temperature of the alloy melt reaches 1470°C, the scale casting is carried out at the linear speed of the rollers at 1m / s per second. After the casting is completed, fill in The argon gas of about 80 kPa is forced to cool for 60-180 minutes, and the scales are continuously turned during the cooling process to obtain master alloy scales of rare earth permanent magnet ...

Embodiment 2

[0064] Adopt formula weight percentage as R x T y B z Fe （100-x-y-z） The formula, in which the rare earth elements represented by R do not add heavy rare earth elements Dy and Tb, x=30.5%, z=0.95%, infiltrate the grain boundary elements in the rare earth permanent magnet material master alloy scales after smelting, and the infiltrated elements are Al, the infiltration weight percentage is 0.18%.

[0065] First provide raw materials with a purity greater than 99wt%, and perform shot blasting treatment for 10-60 minutes, according to the weight percentage of the formula (Nd+Pr) 30.5 (Co 0.4 Cu 0.1 Ga 0.1 Zr 0.12 )B 0.95 Fe 67.83 Ingredients, the prepared raw materials are melted in the vacuum strip billet continuous casting furnace. When the temperature of the alloy melt reaches 1470°C, the scale casting is carried out at the linear speed of the rollers at 1m / s per second. After the casting is completed, fill in The argon gas of about 80 kPa is forced to cool for 60-18...

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Abstract

The invention relates to the field of sintered rare earth permanent magnetic materials, and particularly relates to a preparation method of a sintered rare earth permanent magnetic material. The preparation method comprises the procedures of preparing, burdening, smelting, coarse crushing, fine crushing, profiling, sintering, heat treating, machining, surface treating and crystal boundary permeating, wherein the crystal boundary permeating procedure can be carried out between the smelting procedure and the coarse crushing procedure or between the coarse crushing procedure and the fine crushing procedure. According to the invention, the problems that a permeation depth is limited and a large permanent magnet cannot be produced by a particle boundary permeating technology and the problem of secondary processing waste caused by magnet deformation due to the particle boundary permeating technology are overcome, residual magnetism is not lost as much as possible while the coercive force and the operating temperature of a sintered Nd-Fe-B permanent magnetic material are enhanced, and the consumption of heavy rare earth (namely Dy and Tb) with high prices is reduced.

Description

technical field [0001] The invention relates to the field of sintered rare earth permanent magnet materials, in particular to a method for preparing sintered rare earth permanent magnet materials with reduced amounts of heavy rare earths Dy and Tb. Background technique [0002] Due to the excellent magnetic properties, as well as the substantial increase in energy consumption brought about by social and economic development, and the continuous improvement of environmental protection requirements in various countries, in recent years, high-performance sintered Nd-Fe-B permanent magnet materials have been used in new energy vehicles, energy-saving appliances, The use of high-performance motors, large-scale wind turbines and other fields has developed rapidly, and the market demand has continued to increase. However, the sintered Nd-Fe-B permanent magnet materials used in the field of energy conservation and environmental protection all have a common requirement - high working ...

Claims

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Application Information

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IPC IPC(8): H01F1/053H01F1/08C22C38/00C22C33/02
Inventor 彭步庄史丙强郭宁李广军
Owner YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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