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High-resistivity permanent magnetic alloy and preparing method thereof

A permanent magnet alloy, high resistivity technology, applied in permanent magnets, circuits, magnetic materials, etc., can solve the problems of low maximum magnetic energy product, working temperature limitation, etc., to increase the resistivity of magnets, reduce eddy current loss, and improve motor efficiency Effect

Active Publication Date: 2012-09-19
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymer bonded magnets have high resistivity due to the insulating effect of the binder, but their working temperature is limited by the softening of the polymer material, and the maximum energy product is several times lower than similar sintered magnets due to the magnetic dilution effect

Method used

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Effect test

Embodiment 1

[0039] The permanent magnetic alloy is prepared by the preparation method of the present invention. First, the Nd-Fe-B alloy is made into a quick-setting sheet, which is made into a micron-sized powder by hydrogen crushing and jet milling, and then CaF 2 Nano-powder is used as a solid surfactant, and its addition ratio is 10wt% of the raw material powder for air-jet milling, and a flaky powder with a surface insulating coating is obtained by high-energy ball milling, wherein the high-energy ball milling time used is 1.5 hours, and the ball-to-material ratio is 30:1 ;Compressed and formed in a magnetic field, the magnetic field used is 2T, and the pressure is 180Mpa; Finally, a high-resistivity permanent magnet alloy is obtained by hot pressing, wherein the vacuum degree of hot pressing is higher than 1.0×10 -1 Pa, the hot pressing temperature is 550°C, and the holding time is 1min.

[0040] Under the above-mentioned preparation process conditions, the resistivity of the prepar...

Embodiment 2

[0042] The permanent magnetic alloy is prepared by the preparation method of the present invention. First, the Nd-Fe-B alloy is made into a quick-setting sheet, which is made into a micron-sized powder by hydrogen crushing and jet milling, and then NdF 3 Nano-powder is used as a solid surfactant, and its addition ratio is 10wt% of the raw material powder for jet milling, and a flake powder with a surface insulating coating is obtained by high-energy ball milling, wherein the high-energy ball milling time used is 1.5 hours, and the ball-to-material ratio is 10:1 ;Compressed in a magnetic field, the magnetic field used is 2T, and the pressure is 180Mpa; Finally, a high-resistivity permanent magnet alloy is obtained by hot-pressing, wherein the vacuum degree of hot-pressing is higher than 1.0×10-1Pa, and the hot-pressing temperature is 550°C. The holding time is 1 min.

[0043] Under the above-mentioned preparation process conditions, the resistivity of the prepared high-resistiv...

Embodiment 3

[0045] The permanent magnetic alloy is prepared by the preparation method of the present invention. First, the Nd-Fe-B alloy is made into a quick-setting sheet, which is made into a micron-sized powder by hydrogen crushing and jet milling, and then DyF 3 Nano-powder is used as a solid surfactant, and its addition ratio is 10wt% of the raw material powder for jet milling, and a flake powder with a surface insulating coating is obtained by high-energy ball milling, wherein the high-energy ball milling time used is 1.5 hours, and the ball-to-material ratio is 10:1 ;Compressed in a magnetic field, the magnetic field used is 2T, and the pressure is 180Mpa; Finally, a high-resistivity permanent magnet alloy is obtained by hot-pressing, wherein the vacuum degree of hot-pressing is higher than 1.0×10-1Pa, and the hot-pressing temperature is 550°C. The holding time is 1 min.

[0046] Under the above-mentioned preparation process conditions, the resistivity of the prepared high-resistiv...

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Abstract

The invention belongs to the field of preparation of permanent magnetic materials, and in particular relates to a high-resistivity permanent magnetic alloy and a preparing method thereof. A powder material of the alloy consists of Nd-Fe-B alloy powder and a solid surface active agent insulating layer coated on the surface of the powder, the solid surface active agent is at least one of fluorides or oxides of Li, Na, Mg, Ca, Sr, Ba, Nd, Dy, Tb, Gd and Ho, and is 5-15% of the Nd-Fe-B alloy powder; and the grain diameter of the Nd-Fe-B alloy powder is in a micron stage of 0.5-8 microns, and the grain diameter of the solid surface active agent is in a nanometer stage of 1-100nm. According to the high-resistivity permanent magnetic alloy disclosed by the invention, the resistivity rho is larger than or equal to 1.0m omega cm, and the maximum magnetic energy product (BH) max is larger than or equal to 38MGsOe. The high-resistivity permanent magnetic alloy disclosed by the invention largely reduces vortex loss, simultaneously keeps low costs of a motor and an engine and can be applied to devices, such as high-energy-efficiency motors and high-speed generators.

Description

technical field [0001] The invention belongs to the field of preparation of permanent magnet materials, in particular to a high-resistivity permanent magnet alloy and a preparation method thereof. Background technique [0002] Under the current global economic and environmental conditions, the general concern for high efficiency and energy saving has led to the use of permanent magnet synchronous motors (PMSM) with simple structure, high power factor, and large starting torque to replace traditional electric excitation motors in various industries. However, due to the effect of the space harmonics and time harmonics of the magnetic field, there are eddy currents in the rare earth permanent magnets, and with the increase of the motor power, the volume of the permanent magnets becomes larger, coupled with the poor heat dissipation of the rotor, the eddy current loss will not only cause The higher temperature rise reduces the working efficiency, and in extreme cases, it may cau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F7/02H01F1/057B22F1/02B22F3/02
Inventor 郑立允李卫朱明刚
Owner CENT IRON & STEEL RES INST
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