Magnetic-field temperature-pressure formation

A technology of warm pressing forming and process, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve problems such as compact density, unsatisfactory orientation degree, deterioration of compact orientation degree, affecting material properties, etc.

Inactive Publication Date: 2007-09-05
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the magnetic field forming process, the density and orientation of the compact are not ideal due to factors such as large powder orientation and rotation resistance, friction between powder and powder, powder and mold wall, and powder hardening.
Using cold isostatic pressing can increase the compact density to a certain extent, but it will further deteriorate the orientation degree of the compact and affect the performance of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Under the protection of vacuum or inert gas or organic medium, the rare earth giant magnetostrictive material powder with a particle size of 40.0 μm is prepared, and in a glove box protected by high-purity argon, 1% epoxy resin binder and 0.1% Mix KH550 silane coupling agent and 0.1% zinc stearate lubricant evenly. The mixed powder is subjected to magnetic field warm pressing forming, the forming pressure is 300MPa, the orientation magnetic field is 1.5T, and the forming temperature is 80°C. After the compact is solidified, a bonded rare earth giant magnetostrictive material is obtained, with a relative density of 70.0% (6470kg / m 3 ), the magnetostriction coefficient λ is 600ppm.

Embodiment 2

[0017] Under the protection of vacuum or inert gas or organic medium, the rare earth giant magnetostrictive material powder with a particle size of 550.0 μm is prepared, and in a glove box protected by high-purity argon, 5% of the powder weight epoxy resin binder, 3% of KH550 silane coupling agent and 2% zinc stearate lubricant are evenly mixed. The mixed powder is subjected to magnetic field warm pressing forming, the forming pressure is 900MPa, the orientation magnetic field is 2.5T, and the forming temperature is 180°C. After the compact is cured, a bonded rare earth giant magnetostrictive material is obtained, with a relative density of 88.0% (8140kg / m 3 ), the magnetostriction coefficient λ is 1200ppm.

Embodiment 3

[0019] Under the protection of vacuum or inert gas or organic medium, the neodymium iron boron material powder with a particle size of 40.0 μm is prepared, and epoxy resin and maleic anhydride (2: 1 ) mixed with binder, 0.1% of KH550 silane coupling agent, 0.1% of paraffin and zinc stearate (1:1) mixed evenly with lubricant. The mixed powder is subjected to magnetic field warm pressing forming, the forming pressure is 300MPa, the orientation magnetic field is 1.5T, and the forming temperature is 80°C. After the compact is cured, a bonded NdFeB material is obtained, with a relative density of 65.0% (4875kg / m 3 ), the maximum energy product (BH) max Up to 96.0kJ / m 3 , Remanence Br up to 0.70T.

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Abstract

A magnetic-field thermo-pressing process for preparing the high-performance magnetic material with magnetic anisotropy includes such steps as preparing the ultra-magnetostrictive RE powder or permanent-magnet NdFeB powder or permanent-magnet SmCo powder in vacuum or inertial gas or organic medium, mixing it with adhesive, coupling agent and lubricant, and thermopressing at 80-350 deg.C under 300-900 MPa in a magnetic field (1.5-2.5T).

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular provides a magnetic field warm pressing forming process, which is suitable for preparing high-performance magnetic materials with magnetic anisotropy characteristics, such as bonded rare earth giant magnetostrictive materials and bonded rare earth permanent magnets Material. Background technique [0002] Compression forming is the most common forming method in powder metallurgy technology. Its purpose is to obtain a compact of a certain shape and size, and to make it have a certain density and strength. Since only the pressure field acts in this forming process, it is only suitable for the manufacture of isotropic materials, and there is a large friction between powder and powder, powder and mold wall during the pressing process, which makes the density and strength distribution of the green compact uneven. Uniformity, powder compaction and hardening are difficult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/14H01F1/053H01F1/08H01F41/02
Inventor 张深根曲选辉左志军田建军王健秦明礼何新波
Owner UNIV OF SCI & TECH BEIJING
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