Nano rare-earth permanent magnet material

A permanent magnet ferrite and nano rare earth technology, applied in the field of materials, can solve the problems of uneven distribution, increase the cost of ferrite, increase the amount of trace elements, etc. Effect

Active Publication Date: 2014-06-04
南通飞来福磁铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the existing ferrite materials are sintered with micron-scale components to form sintered magnets or magnetic powders. Using micron-scale components, most of the components are solid-dissolved on the grain boundaries during the sintering process, and only a small amount of components enter the grains. The distribution of these trace elements in ferrite grain boundaries and grains is not uniform. If you want to prepare ferrite with high magnetic properties, you need more trace elements. Since these trace elements are precious metal oxides, If you want to obtain ferrite with high magnetic properties, you must increase the amount of trace elements, thereby increasing the cost of ferrite

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A nano-rare earth permanent magnet ferrite material, characterized in that, in parts by weight, it comprises 100 parts of ferric oxide, 32 parts of aluminum oxide, 0.5 parts of barium carbonate, 2.5 parts of strontium carbonate, 1 part of lanthanum oxide, 3 parts of neodymium oxide and 4 parts of zinc stearate; among them, aluminum oxide, lanthanum oxide and neodymium oxide are added as nano-sized particles with a particle size of 50-200nm;

[0022] The ferrite material is prepared through the following steps:

[0023] (1) Pre-fire ferric oxide, aluminum oxide, barium carbonate, strontium carbonate, lanthanum oxide and neodymium oxide in proportion, among which aluminum oxide is half of the total amount, and the pre-burning temperature is 1200-1300°C , keep for 3-5h, stop heating, after the raw material is naturally cooled, carry out coarse crushing by dry ball milling method, the average particle size of the raw material after coarse crushing is 4-8μm;

[0024] (2) Af...

Embodiment 2

[0028] A nanometer rare earth permanent magnet ferrite material is characterized in that, in parts by weight, it comprises 120 parts of ferric oxide, 16 parts of aluminum oxide, 1.5 parts of barium carbonate, 1.5 parts of strontium carbonate, 3 parts of lanthanum oxide, 1 part of neodymium oxide and 12 parts of zinc stearate; among them, aluminum oxide, lanthanum oxide and neodymium oxide are added as nano-sized particles with a particle size of 50-200nm;

[0029] The ferrite material is prepared through the following steps:

[0030] (1) Pre-fire ferric oxide, aluminum oxide, barium carbonate, strontium carbonate, lanthanum oxide and neodymium oxide in proportion, among which aluminum oxide is half of the total amount, and the pre-burning temperature is 1200-1300°C , keep for 3-5h, stop heating, after the raw material is naturally cooled, carry out coarse crushing by dry ball milling method, the average particle size of the raw material after coarse crushing is 4-8μm;

[0031...

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PUM

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Abstract

The invention discloses a nano rare-earth permanent magnet material, which consists of ferric oxide, aluminum oxide, barium carbonate, strontium carbonate, lanthanum oxide, neodymium oxide and zinc stearate, wherein the aluminum oxide, the lanthanum oxide and the neodymium oxide are added in the form of nanoparticles, and the magnet material is prepared through steps of pre-sintering, breaking, sheet stamping and sintering. The magnet material disclosed by the invention is reasonable in formula and simple in preparation method; the nano material, as a control agent of a crystal microstructure, can effectively reduce sintering temperature and inhibit excessive growth of magnet grains, so as to improve magnetic performance; and the nano material also can perfect the crystal structure, thus improving saturation induction density of the magnet.

Description

Technical field: [0001] The invention relates to a nanometer rare earth permanent magnet ferrite material, which belongs to the field of materials. Background technique: [0002] For a long time, ferrite permanent magnet materials have been widely used in various motors with high power, high speed and high torque due to their high cost performance, such as high-end automobile motors (ABS motors, starter motors, etc.), motorcycle starter motors , household appliances and electric tool motors and other fields. At present, in order to improve the comprehensive magnetic properties of permanent magnet ferrite, the main methods used include: (1) seek a better formula system, (2) adopt a reasonable post-processing technology on the basis of a good formula. [0003] Most of the existing ferrite materials are sintered with micron-scale components to form sintered magnets or magnetic powders. Using micron-scale components, most of the components are solid-dissolved on the grain bound...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 周连明周园园
Owner 南通飞来福磁铁有限公司
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