Method for synthesizing presintering hard ferrite material

The technology of a hard ferrite and a synthesis method is applied in the synthesis of hard ferrite pre-sintered materials and the field of magnetic material preparation, which can solve the problems of large heat dissipation of the rotary kiln body and high energy consumption in the reaction process, and is suitable for batch production. The effect of short production and synthesis time and low synthesis energy consumption

Inactive Publication Date: 2010-05-26
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, pre-fired materials are usually pre-fired in a rotary kiln to complete the solid-phase reaction of ferriteization. The heat dissipation of the kiln body is large, which makes the energy consumption of the reaction process high

Method used

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  • Method for synthesizing presintering hard ferrite material
  • Method for synthesizing presintering hard ferrite material
  • Method for synthesizing presintering hard ferrite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Taking strontium ferrite pre-sintered material as an example, a synthesis method of hard ferrite pre-sintered material.

[0034] (1), according to the molar ratio of 5.8:1:0.01 Fe is calculated 2 o 3 , SrCO 3 and Nd 2 o 3 proportioning, and then weighed;

[0035] (2), put the weighed material into the ball mill tank for mixing with water, material and ball mass ratio of 1:2:2, the ball milling speed is 200r / min, and the ball milling is 2h;

[0036] (3), the ball mill slurry was left to settle and poured out the water and dried in an electric oven for 20 hours;

[0037] (4), the dried material is put into an alumina crucible;

[0038] (5) Put the alumina crucible containing the material into a microwave oven, heat it with a microwave physical field with a frequency of 2450MHz, raise the temperature to 1215°C at a heating rate of 50°C / min, and then keep it warm for 60min, the particle size can be obtained. 0.8μm single-phase ferrite pre-fired material;

[0039] (6...

Embodiment 2

[0044] Taking barium ferrite pre-sintered material as an example, a synthesis method of hard ferrite pre-sintered material.

[0045] (1), according to the molar ratio of 5.6:1:0.02 Fe is calculated 2 o 3 、BaCO 3 and La 2 o 3 proportioning, and then weighed;

[0046] (2), put the weighed material into the ball mill tank for mixing with water, material and ball mass ratio of 1:2:2, the ball milling speed is 200r / min, and the ball milling is 2h;

[0047] (3), the ball mill slurry was left to settle and poured out the water and dried in an electric oven for 20 hours;

[0048] (4), the dried material is put into an alumina crucible;

[0049] (5) Put the alumina crucible containing the material into a microwave oven, heat it with a microwave physical field with a frequency of 3000MHz, raise the temperature to 1150°C at a heating rate of 70°C / min, and then keep it warm for 80min, the particle size can be obtained. 0.9μm single-phase ferrite pre-fired material;

[0050] (6), a...

Embodiment 3

[0052] Taking lead ferrite pre-sintered material as an example, a synthesis method of hard ferrite pre-sintered material.

[0053](1), according to the molar ratio of 1:5.8:0.025 to calculate Fe 2 o 3 , PbCO 3 And the proportioning of CaO, weigh then;

[0054] (2), put the weighed material into the ball mill tank for mixing with water, material and ball mass ratio of 1:2:2, the ball milling speed is 200r / min, and the ball milling is 2h;

[0055] (3), the ball mill slurry was left to settle and poured out the water and dried in an electric oven for 2 hours;

[0056] (4), the dried material is put into an alumina crucible;

[0057] (5) Put the alumina crucible containing the material into a microwave oven, heat it with a microwave physical field with a frequency of 300MHz, and heat it up to 1300°C at a heating rate of 30°C / min, and then keep it for 60min to obtain a particle size of about 1.5μm single-phase ferrite pre-fired material;

[0058] (6), after the synthesized ca...

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Abstract

The invention discloses a method for synthesizing a presintering hard ferrite material, which takes one or more of oxide or carbonate of ferrite cations and other additives such as CaO, Al2O3 and the like as raw materials, and comprises the following steps: ball milling and tempering, drying, heating by a microwave physical field with the frequency of 300-3,000MHz, raising the temperature to 1,150-1,350 DEG C at the heating-warming speed of 20-80 DEG C / min, and preserving the temperature for 30-180min to obtain the single-phase presintering hard ferrite material with the grain size being about 0.2-2 mu m. Compared with the traditional method for synthesizing presintering materials, the method in the invention has the advantages of short presintering time, low energy consumption, fine and uniform grains of the presintering materials, good moldability and stable magnetic performance, and can be used for preparing sintering bodies by wet compression moulding and dry compression moulding.

Description

technical field [0001] The invention relates to a method for synthesizing hard ferrite calcined material. It belongs to the new technology field of magnetic material preparation. Background technique [0002] Ferrite is a metal oxide with ferromagnetism. The raw material for producing permanent ferrite in the production process is mainly powdered iron oxide (Fe 2 o 3 etc.), MO (M: Ba, Sr, etc.) or M salts that can easily form oxides when heated. Mix the powdered raw materials and pre-fire in an oxidizing atmosphere to cause a solid-state reaction to generate MO·6Fe 2 o 3 The magnetic phase, which is the material used in the production of ferrite magnets, is called burnt charge. [0003] Ferrite calcined material is used as the raw material for the production of permanent magnet ferrite. After the calcined material is crushed, it is formed by dry or wet pressure, and then it is sintered twice, and finally ferrite can be obtained after finishing on a grinding machine. ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/26H01F1/11
Inventor 王占勇金鸣林蒋涵涵钟柳明刘慧敏钱蕙春郑玉丽房永征徐家跃
Owner SHANGHAI INST OF TECH
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