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Process for preparing magnetic powder and sintered magnet and product produced thereby

A technology of sintered magnets and manufacturing methods, which is applied in the manufacture of inductors/transformers/magnets, inorganic material magnetism, electrical components, etc., can solve the problems of affecting magnetic properties, easy change of crystal structure, low temperature coefficient of intrinsic coercivity, etc.

Active Publication Date: 2006-08-23
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention mainly solves the single crystal structure caused by the iron in the ferrite sintered magnet being completely trivalent due to the unreasonable raw material formula in the production process of the prior art. When other substances are added in the sintering process, the crystal structure is very Easy to change, seriously affecting the magnetic properties
[0007] The present invention also solves the problems in the prior art that the ferrite has high residual magnetic induction, high coercive force, high intrinsic coercive force, high magnetic energy product and low intrinsic coercive force temperature coefficient, etc. Problem; provide a formula that can comprehensively and effectively optimize the parameters of ferrite and the method of manufacturing the ferrite powder and sintered ferrite
[0008] At the same time, the present invention solves the technical problem that the batching and sintering processes in the prior art must meet the charge balance conditions in non-stoichiometric conditions, which adversely affects the performance of the batching and products; it provides an easy-to-configure, The obtained product has superior performance and is compatible with reasonable magnet powder and sintered magnet

Method used

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  • Process for preparing magnetic powder and sintered magnet and product produced thereby
  • Process for preparing magnetic powder and sintered magnet and product produced thereby
  • Process for preparing magnetic powder and sintered magnet and product produced thereby

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The following raw materials are used as raw materials:

[0066] Fe 3 o 4 Powder and Fe 2 o 3 powder (of which Fe 2 o 3 The purity of the powder ≥ 99.2wt%, the original average particle size of the particles: 1.0μm) 85.6wt%

[0067] SrCO 3 Powder (purity ≥ 98.0wt%, original average particle size of particles: 2.1μm) 12.1wt%

[0068] La 2 o 3 Powder (purity ≥ 99.0wt%, original average particle size of particles: 0.8μm) 1.5wt%

[0069] co 2 o 3 Powder (purity ≥ 99.0wt%, original average particle size of particles: 0.8μm) 0.8wt%

[0070] Perform physical and chemical analysis on various raw materials, take them in a molar ratio, then add raw materials and additives (specific substances) in a wet ball mill, mix them, and then dry them, pre-burn them in the air at 1210°C, and keep them warm for 2 hours. Obtain a granulated calciner with a ferrite main phase as:

[0071] Sr 1-x La x [(Fe 3+ a Fe 2+ b ) 12-y co y ]O 19 .

[0072] The dispersant of 0.4wt%...

Embodiment 2

[0092] The following raw materials are used as raw materials:

[0093] Fe 3 o 4 Powder and Fe 2 o 3 powder (of which Fe 2 o 3 The purity of the powder ≥ 99.2wt%, the original average particle size of the particles: 1.0μm) 84.5wt%

[0094] SrCO 3 Powder (purity ≥ 98.0wt%, original average particle size of particles: 2.1μm) 10.8wt%

[0095] La 2 o 3 Powder (purity ≥ 99.0wt%, original average particle size of particles: 0.8μm) 3.2wt%

[0096] co 2 o 3 Powder (purity ≥ 99.0wt%, original average particle size of particles: 0.8μm) 1.5wt%

[0097] Add raw materials and additives in a wet ball mill, mix them, then dry them, pre-fire them in the air at 1200°C, and keep them warm for 1.5 hours to obtain granular pre-fired materials, so that they have a ferrite main phase:

[0098] Sr 1-x La x [(Fe 3+ a Fe 2+ b ) 12-y co y ]O 19 .

[0099] The obtained calcined material was dry coarsely pulverized in a continuous dry vibrating ball mill for 10 minutes, and the aver...

Embodiment 3

[0118] The following raw materials are used as raw materials:

[0119] Fe 3 o 4 Powder and Fe 2 o 3 powder (of which Fe 2 o 3 The purity of the powder ≥ 99.2wt%, the original average particle size of the particles: 1.0μm) 82.5wt%

[0120] SrCO 3 Powder (purity ≥ 98.0wt%, original average particle size of particles: 2.1μm) 7.6wt%

[0121] La 2 o 3 Powder (purity ≥ 99.0wt%, original average particle size of particles: 0.8μm) 6.3wt%

[0122] co 2 o 3 Powder (purity ≥ 99.0wt%, original average particle size of particles: 0.8μm) 3.6wt%

[0123] Use the following materials as additives

[0124] SiO 2 : Powder (purity ≥ 99.0wt%, original average particle size of particles: 0.5μm) 0.2wt%

[0125] CaCO 3 : Powder (purity ≥ 99.0wt%, original average particle size of particles: 1.5μm) 0.2wt%

[0126] Add raw materials and additives in a wet ball mill, mix them, then dry them, pre-fire them in the air at 1250°C, and keep them warm for 2.5 hours to obtain granular pre-fire...

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Abstract

This invention relates to magnetic material field and especially to a process method improvement and its formula to hexagonal magnetic lead ferrite powder and sinter magnetism, wherein the said magnetism or magnetic powder has one-Curie temperature with A,R, B and Fe hexagonal ferrite main phase and the following molecular formula: A1-XRx[(Fe3+aFe2+b)12-yBy]zO19, through adding positive three Co and optimizing the formula and improving the magnetism crystal aeolotropism constant K1.

Description

technical field [0001] The invention relates to the field of magnetic materials, in particular to an improvement in the manufacturing method of hexagonal magnetoplumbite ferrite magnet powder, a sintered magnet and its formula. Background technique [0002] Sintered permanent magnet ferrite has the advantages of stable magnetic properties and strong demagnetization resistance; it is not easy to rust and does not need to be coated with a protective layer; it is hard and brittle and can be used for special tool processing and cutting; Suitable for automobiles, household appliances, industrial automation and other industries. The sintered permanent ferrite is made of hexagonal sintered ferrite magnets, especially the hexagonal magnetoplumbite ferrite is more widely used. Oxide permanent magnet ferrite material mainly adopts strontium ferrite (SrO·6Fe) with magnetoplumbite (M type) hexagonal structure 2 o 3 ) and barium ferrite (BaO·6Fe 2 o 3 ) as a raw material to sinter m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/10H01F1/11H01F41/02B22F9/00B22F3/10
Inventor 何时金何震宇丁伯明包大新何军义
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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