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Assistant alloy for Nd-Fe-B permanent magnetic material and its preparation method

A technology for auxiliary alloys and permanent magnet materials, applied in the fields of magnetic materials, inductance/transformer/magnet manufacturing, magnetic objects, etc., can solve the problems of difficult operation technology, high investment, low production efficiency, etc., to improve the solidification rate, process Simple equipment and easy-to-operate effects

Active Publication Date: 2008-02-27
LESHAN YOUYAN RARE EARTH NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mold casting method commonly used in the preparation of auxiliary alloys for NdFeB, due to the serious segregation of the components during the crystallization process, resulting in uneven dispersion of the rare earth-rich phase, it is difficult to accurately control the composition of the alloy
In addition, the auxiliary alloys for NdFeB prepared by conventional casting methods are difficult to break, resulting in low production efficiency in the subsequent powder making process
These will eventually lead to a reduction in the performance of NdFeB magnets and an increase in cost
[0004] Chinese patent (02118142.x) discloses a method for preparing NdFeB magnets by two-phase sintering, but does not involve the microstructure of the auxiliary alloy
However, these methods are difficult to operate, complicated equipment, high investment, and are not conducive to reducing the cost of alloys.

Method used

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  • Assistant alloy for Nd-Fe-B permanent magnetic material and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The auxiliary alloy of this embodiment, its alloy composition ratio is: the total amount of rare earth is 50.00wt%, wherein: Nd28%, Pr7.00wt%, Dy15.00wt%, Mo0.45wt%, Co1.50wt%, W0.45wt% %, Mn1.50wt%, and the balance is Fe. Batch 100 kilograms according to the above-mentioned composition ratio, put it into a crucible, and melt it with intermediate frequency under the protection of vacuum or argon, and cast the molten alloy on the iron water cooling plate. The water cooling plate rotates at a speed of 3 degrees per second. Forced cooling under tap water. Evenly pour the molten alloy onto the water-cooled plate, and continue to pass the cooling water until it is released from the furnace after the casting is completed. The auxiliary alloy for NdFeB obtained in Example 1 has a thickness of 8-10 mm. The solidification structure of the auxiliary alloy is uniform and fine columnar grains, the columnar grains account for 99%, the grain width is 0.05-0.2mm, and the length is 2...

Embodiment 2

[0013] The auxiliary alloy for neodymium iron boron of the present embodiment, its alloy composition distribution ratio is: the total amount of rare earth is 60.00wt%, wherein: Nd 35%, Gd2%,, Pr10.00wt%, Dy8.00wt%, Tb5%, Cu0 .7wt%, Co1.50wt%, Zr0.5wt%, Ga0.50wt%, Al0.7wt%, Nb0.60wt%, the balance is Fe. Batch 100 kilograms according to the above-mentioned composition ratio, put it into a crucible, and melt it with intermediate frequency under the protection of vacuum or argon, and cast the molten alloy on the copper water cooling plate. The water cooling plate rotates at a speed of 0.5 degrees per second. Forced cooling under tap water. Evenly pour the molten alloy onto the water-cooled plate, and continue to pass the cooling water until it is released from the furnace after the casting is completed. The thickness of the auxiliary alloy for NdFeB obtained in Example 2 is 25-30 mm. The solidification structure of the auxiliary alloy is uniform and fine columnar grain, the colu...

Embodiment 3

[0015] The auxiliary alloy for NdFeB in this embodiment has an alloy composition ratio of: the total amount of rare earth is 30.00wt%, wherein: Nd25%, Pr5.00wt%, Si0.7wt%, Co1.50wt%, Sn0.5wt% , Bi0.50wt%, V0.7wt%, Cr0.60wt%, and the balance is Fe. Batch 100 kilograms according to the above-mentioned composition ratio, put it into a crucible, and melt it with intermediate frequency under the protection of vacuum or argon, and cast the molten alloy on the iron water cooling plate, which rotates at a speed of 60 degrees per second, and the water cooling plate Forced cooling under tap water. Evenly pour the molten alloy onto the water-cooled plate, and continue to pass the cooling water until it is released from the furnace after the casting is completed. The auxiliary alloy for NdFeB obtained in Example 3 has a thickness of 1-10 mm. The solidification structure of the auxiliary alloy is uniform and fine columnar grain, the columnar grain structure accounts for 30%, the grain wi...

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Abstract

The invention relates to an auxiliary alloy of neodymium iron boron permanent magnetic material and relative one-way control heat flow preparation method. The invention is characterized in that: said auxiliary alloy comprises one or several rare-earth elements, whose total amount is between 30-60wt%, and the other is transition group and one or several kinds of other metallic elements. The producing method comprises: melting raw material to cast the rotational water cooling disc; the rotational water cooling disc forces the water cooling to control the one-way hot flow direction to form the auxiliary alloy with fine cylinder crystal solidified organism. Compared to traditional neodymium iron boron auxiliary alloy producing method, the invention has high producing efficiency, non-component error analysis, uniform solidified organism, easy breakage and high magnetic property without uniform heating process.

Description

technical field [0001] The invention relates to the field of new functional materials and their manufacture, in particular to an auxiliary alloy for NdFeB permanent magnet materials and a preparation method for unidirectional heat flow control. Background technique [0002] Take Nd 2 Fe 14 NdFeB permanent magnet materials with B as the matrix have long occupied an extremely important position in magnetic functional materials due to their excellent magnetic properties. The double alloy sintering is currently an effective method for preparing high-performance NdFeB magnets, that is, the main phase --- Nd 2 Fe 14 Phase B and grain boundary phase --- rare earth-rich phase (with high concentration of rare earth elements) are mixed and sintered. Nd 2 Fe 14 The B-phase alloy is called the main alloy, and the rare earth-rich phase is called the auxiliary alloy. The former is the basis of magnetic properties, and the latter is the basis of liquid phase sintering. [0003] Auxi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02C22C30/00
Inventor 李红卫李宗安姚国庆于敦波颜世宏应启明李扩社李世鹏袁永强徐静
Owner LESHAN YOUYAN RARE EARTH NEW MATERIAL CO LTD
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