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Preparing method of magnetic powder for dry pressing anisotropic permanent-magnetic ferrite

A manufacturing method and permanent magnet technology, which is applied in the field of permanent magnet material preparation, can solve problems such as large water consumption, high energy consumption, and complicated process flow, and achieve the effects of reducing water consumption, reducing process flow, and reducing energy consumption

Active Publication Date: 2018-07-17
安徽盛美格新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are dehydration and drying processes for wet abrasives, which not only complicate the process, but also require a large amount of water and high energy consumption.

Method used

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  • Preparing method of magnetic powder for dry pressing anisotropic permanent-magnetic ferrite
  • Preparing method of magnetic powder for dry pressing anisotropic permanent-magnetic ferrite
  • Preparing method of magnetic powder for dry pressing anisotropic permanent-magnetic ferrite

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Embodiment 1

[0041] This embodiment provides a method for manufacturing magnetic powder for dry-pressing anisotropic permanent ferrite, comprising the following steps:

[0042] The ferrite pre-fired material uses the following raw materials:

[0043] Iron oxide (i.e. iron red): 1200 grams (particle size is 0.70 μm, purity greater than 98.5%);

[0044] Strontium carbonate: 190 grams (particle size is 1.8 μm, purity is greater than 97.5%);

[0045] Use a vibration mill to mix the materials (mix the above-mentioned iron oxide and strontium carbonate), granulate, pre-fire at 1100°C for 2 hours to make ferrite calcined material, and coarsely crush the ferrite calcined material into an average particle size It is a coarse powder of about 2 μm, and 1.0% of the weight of the coarse powder is added to the coarse powder. 3 and 0.35% SiO 2 , vibrated and milled for 2 hours, the average particle size of the magnetic powder is 1.40 μm, and then adding 1.0% camphor powder and 0.3% calcium stearate ac...

Embodiment 2、 Embodiment 3

[0047] According to the above-mentioned process of Example 1, only changing the low-temperature pre-calcination temperature to 1150°C and 1180°C, respectively, Example 2 and Example 3 for preparing dry-pressed magnetic powder were obtained.

Embodiment 4～6

[0049] According to the process in the above-mentioned examples 1, 2 and 3, but change the CaCO in the secondary batching 3 and SiO 2 , adding 1.0% CaCO by weight to the coarse powder from the original 3 and 0.35% SiO 2 , instead adding 0.75% of CaCO by weight of coarse powder 3 and 0.3% SiO 2 , to obtain embodiment 4, implementation 5 and implementation 6 of preparing dry-pressed magnetic powder respectively.

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Abstract

The invention discloses a preparing method of magnetic powder for a dry pressing anisotropic permanent-magnetic ferrite. The method comprises the steps of adopting small-particle-size ferric oxide andstrontium carbonate, conducting low temperature pre-sintering after ferric oxide and strontium carbonate are mixed to obtain ferrite pre-sintering materials of which the average crystal particle sizeis smaller than 1.2 micron, adding calcium carbonate and silicon dioxide into the ferrite pre-sintering materials, then preparing fine powder of which the average particle size is 1.0-1.7 micron after dry grinding conducted by a dry grinding mill, and preparing the magnetic powder for the dry pressing anisotropic permanent magnet through dispersion conducted by a powder machine after camphor powder and calcium stearate are added to the fine powder. According to the preparing method of magnetic powder for the dry pressing anisotropic permanent-magnetic ferrite, currently common methods are changed, that is to say, regarding the fine grinding method, common wet fine grinding is replaced by dry fine grinding, wet material grinding , dewatering and drying steps are omitted, the technical procedures are reduced, water and energy consumption during production is reduced, and the preparing method is more environmentally friendly and low carbon.

Description

technical field [0001] The invention relates to the field of permanent magnet material preparation, in particular to a method for manufacturing magnetic powder for dry-pressing anisotropic permanent ferrite. Background technique [0002] Ferrite permanent magnet is a kind of material with magnetoplumbite type (M type) crystal structure. Due to its low price and good magnetic and temperature characteristics, it is widely used in electrical equipment in household appliances, office equipment and automobiles. Motor magnetic tiles and rotors, etc. [0003] The manufacture of ferrite magnets is generally made by mixing raw materials, pre-sintering, and then crushing into a suitable particle size to become a pre-sintered coarse powder, and then finely grinding into a fine powder, molding into a desired shape and sintering to make a magnet. To manufacture anisotropic sintered magnets, molding is performed in a magnetic field. [0004] Ferrite magnets can be divided into wet press...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/63C04B35/632C04B35/622C04B35/26
CPCC04B35/2633C04B35/2683C04B35/2691C04B35/622C04B35/62605C04B35/62685C04B35/6303C04B35/632C04B2235/3208C04B2235/3213C04B2235/3272C04B2235/3418C04B2235/5436C04B2235/5445C04B2235/602C04B2235/656C04B2235/6567C04B2235/6583
Inventor 周小霞吕宝顺齐勉达晁向
Owner 安徽盛美格新材料有限公司
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