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A kind of preparation method of ndfeb target material with texture characteristics

A texture and target material technology, applied in magnetic materials, inductor/transformer/magnet manufacturing, electrical components, etc., can solve the problems of high α-Fe phase content, low proportion of B main phase, no texture, etc.

Inactive Publication Date: 2017-03-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Die-cast NdFeB targets have no orientation and are isotropic; although the oxygen content is low (generally 100ppm-300ppm), the α-Fe phase content due to segregation is high (generally 5wt%-10wt%), resulting in Nd 2 Fe 14 B main phase ratio is low
Therefore, the die-cast NdFeB target has no texture, Nd 2 Fe 14 Disadvantages of low proportion of B main phase

Method used

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  • A kind of preparation method of ndfeb target material with texture characteristics
  • A kind of preparation method of ndfeb target material with texture characteristics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] After the metal Nd and metal Fe are removed from the surface oxide layer, they are mixed with BFe alloy to obtain the components Nd27.18wt% (considering burning loss, 0.5wt% higher than the stoichiometric ratio), B1wt%, and the balance is Fe. After the proportioned raw materials are loaded into the directional solidification furnace, vacuumize to 10 -3 Pa, then filled with argon to 0.6atm, load power for medium frequency induction melting, temperature to 1510°C, keep warm for 20min to ensure uniform NdFeB alloy melt. Then perform directional solidification at a speed of 10 mm / h, and after all the alloys are directional solidified, drop to room temperature to obtain directional solidified NdFeB rods. Analysis showed that the bar had axial orientation characteristics, an oxygen content of 30ppm, Nd 2 Fe 14 B main phase proportion 99.5 wt%. Axially textured NdFeB targets can be obtained by machining.

Embodiment 2

[0011] After the metal Nd and metal Fe are removed from the surface oxide layer, they are mixed with BFe alloy to obtain the components Nd27.18wt% (considering burning loss, 0.5wt% higher than the stoichiometric ratio), B1wt%, and the balance is Fe. After the proportioned raw materials are loaded into the directional solidification furnace, vacuumize to 10 -3 Pa, then filled with argon to 0.6atm, load power for medium frequency induction melting, temperature to 1510°C, keep warm for 20min to ensure uniform NdFeB alloy melt. Then perform directional solidification at a speed of 10 mm / h, and after all the alloys are directional solidified, drop to room temperature to obtain directional solidified NdFeB rods. Analysis showed that the bar had axial orientation characteristics, an oxygen content of 120ppm, Nd 2 Fe 14 The proportion of main phase B is 99.4 wt%. NdFeB targets with vertical axial texture can be obtained by machining.

Embodiment 3

[0013] After the metal Nd and metal Fe are removed from the surface oxide layer, they are mixed with BFe alloy to obtain the components Nd27.18wt% (considering burning loss, 0.5wt% higher than the stoichiometric ratio), B1wt%, and the balance is Fe. After the proportioned raw materials are loaded into the directional solidification furnace, vacuumize to 10 -3 Pa, then filled with argon to 0.6atm, load power for medium frequency induction melting, temperature to 1510°C, keep warm for 20min to ensure uniform NdFeB alloy melt. Then perform directional solidification at a speed of 10 mm / h, and after all the alloys are directional solidified, drop to room temperature to obtain directional solidified NdFeB rods. Analysis showed that the bar had axial orientation characteristics, an oxygen content of 280ppm, Nd 2 Fe 14 B main phase proportion 99.0 wt%. Axially textured NdFeB targets can be obtained by machining.

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Abstract

The invention provides a preparation method of an NdFeB target with texture characteristics and belongs to the field of material preparation. The preparation method of the NdFeB target with texture characteristics comprises the following steps: firstly preparing a NdFeB bar with axial orientation by an directional solidification device under the condition of argon gas protection; then radially and linearly cutting and processing the bar to obtain the NdFeB target with axial texture characteristics or axially and linearly cutting to obtain the target with the axial texture characteristics. The method can be used for preparing the NdFeB target with texture characteristics; the target is low in content of oxygen; the ratio of the components is close to the stoichiometric ratio; the target is high in Nd2Fe14B main phase ratio; the defects of high content of oxygen, low Nd2Fe14B main phase ratio and uncontrollable texture characteristics of the NdFeB target prepared by a powder metallurgy process and a die casting process are avoided.

Description

technical field [0001] The invention provides a method for preparing a NdFeB target material with texture characteristics, belonging to the field of material preparation. Background technique [0002] NdFeB permanent magnet is currently the permanent magnet material with the highest comprehensive performance, and has been widely used in the fields of electromechanical, information and national defense. In the process of developing magnetic thin films, NdFeB targets are naturally used. With the increasing requirements for magnetic thin films, the requirements for high-quality NdFeB targets are very urgent. High quality NdFeB target should have specific texture, low oxygen content, high Nd 2 Fe 14 B main phase ratio, etc. The existing NdFeB target preparation processes mainly include powder metallurgy process and die casting process. The powder metallurgy process is to crush the Nd-Fe-B alloy ingot into a powder with a certain particle size, and then use ordinary molding ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C22C33/04H01F1/057
CPCC22C33/04C23C14/3414H01F1/057H01F41/183
Inventor 张深根于鸣刘波潘德安田建军
Owner UNIV OF SCI & TECH BEIJING