Low-cost high-resistivity cerium magnet and preparation method thereof

A high-resistivity, low-cost technology, applied in the manufacture of inductors/transformers/magnets, magnetic objects, circuits, etc., can solve the problems of limited operating temperature, low maximum magnetic energy product, etc., and achieve reduced eddy current loss, reduced cost, and high magnetic energy cumulative effect

Active Publication Date: 2013-03-13
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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Adopt preparation method of the present invention to prepare a kind of cerium magnet permanent magnet alloy, the Ce-Nd-Fe-B alloy composition that smelting gains in embodiment 1 is Ce according to the percentage 24 Nd 6 (Fe, Co) 69.2 B 0.8 , at first, the Ce-Nd-Fe-B alloy that makes is made quick-setting sheet, is made into micron powder through hydrogen crushing and jet milling, specifically, through hydrogen crushing and jet milling in embodiment 1 The particle size of the micron-sized powder is 0.5 μm to 8 μm, and then CaF 2 Nano powder is used as a solid surfactant, and the selected solid surfactant has a particle size of 1-100nm. The solid surfactant can form an insulating layer on the outer surface of the above-mentioned Ce-Nd-Fe-B alloy powder. The addition ratio It is 5wt% of the jet milling raw material powder, and obtains flake powder with a surface insulating coating by high-energy ball milling, wherein the high-energy ball milling time used is 1.5 hours, ...

Embodiment 2

[0034] Adopt preparation method of the present invention to prepare cerium magnet permanent magnet alloy, the Ce-Nd-Fe-B alloy composition that smelting gains in embodiment 2 is Ce according to percentage 1 Nd 29 (Fe, Ca) 69 B 1 , first, the Ce-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, specifically, the particle size of the micron-sized powder made by hydrogen crushing and jet milling is 0.5 μm to 8μm, then use NdF 3 Nanopowder is used as a solid surfactant, and the selected solid surfactant NdF 3 The particle size of the nanopowder is 1-100nm, and the solid surfactant can form an insulating layer on the outer surface of the Ce-Nd-Fe-B alloy powder. Its addition ratio is 10wt% of the raw material powder of the jet mill, and it is obtained by high-energy ball milling. Flake powder with a surface insulating coating, wherein the high-energy ball milling time used is 1.5 hours, the ball-to-m...

Embodiment 3

[0037] Adopt the preparation method of the present invention to prepare cerium magnet permanent magnet alloy, the Ce-Nd-Fe-B alloy composition obtained through smelting in the present embodiment is Ce according to the percentage 16 Nd 14 (Fe, Cu) 68.5 B 1.5 , first, the Ce-Nd-Fe-B alloy is made into a quick-setting sheet, which is made into a micron-sized powder through hydrogen crushing and jet milling. In this embodiment, the particle size of the micron-sized powder made through hydrogen crushing and jet milling is 0.5 μm to 8μm, then DyF 3 Nano-powder is used as a solid surfactant, the particle size of the nano-powder is 1-100nm, and its addition ratio is 5wt% of the raw material powder for jet milling, and a flaky powder with a surface insulating coating is obtained by high-energy ball milling, wherein the high-energy ball milling The time is 1.5 hours, the ratio of ball to material is 10:1, and the ball milling medium is n-heptane; it is pressed and formed in a magneti...

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Abstract

The invention provides a low-cost high-resistivity cerium magnet and a preparation method thereof. The cerium magnet comprise the following materials: Ce-Nd-Fe-B alloy powder and a solid surface activating agent covering the surface of the alloy powder, wherein the solid surface activating agent contains at least one fluorid or oxid of Li, Na, Mg, Ca, Sr, Ba, Nd, Dy, Tb, Gd or Ho; the weight of the solid surface activating agent is 5-15% of that of the Ce-Nd-Fe-B alloy powder; the particle diameter of the Ce-Nd-Fe-B alloy powder is 0.5-8 micrometers; and the particle diameter of the solid surface activating agent is 1-100 nanometers. The resistivity rho of the cerium permanent magnet alloy is greater than or equal to 1.0m omega centimeter, and the maximum magnetic energy product (BH) max is greater than or equal to 32MGsOe. With the adoption of the magnet, the eddy current loss can be reduced greatly, and the low cost of a motor and an engine is maintained at the same time; and the magnet can be applied to equipment, such as the motor with high energy efficiency and the high-speed engine.

Description

technical field [0001] The invention relates to the field of permanent magnet materials, and more specifically relates to a low-cost high-resistivity cerium magnet and a preparation method thereof. The cerium magnet has low cost and high resistivity. Background technique [0002] In recent years, the application of rare earth permanent magnets has made permanent magnet synchronous motors (PMSM) with simple structure, high power factor and large starting torque gradually replace traditional electric excitation motors in various industrial fields. However, the rare-earth permanent magnets used in PMSM are conductors, and there are eddy currents inside during operation, and with the increase of motor power, the volume of permanent magnets becomes larger, coupled with the poor heat dissipation of the rotor, eddy current losses will not only cause higher temperature rise, make the work Reduced efficiency and in extreme cases can lead to demagnetization of the permanent magnets, r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
Inventor 郑立允李卫朱明刚
Owner CENT IRON & STEEL RES INST
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