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Method for reducing firing shrinkage of strontium ferrite magnetic material, and product prepared by method

A technology of strontium ferrite and magnetic material, applied in the field of a method and its products, can solve the problems of no patent report, large processing volume and high hardness, and achieve the effect of obvious theoretical guiding significance and good practical significance.

Inactive Publication Date: 2013-06-05
JINGDEZHEN CERAMIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the post-processing process, products with large deformation require a large amount of processing, and the ferrite material has high hardness and brittleness, which makes post-processing difficult and high cost
[0003] At present, most of the Chinese patents on ferrite focus on improving the performance of ferrite magnetic materials, reducing the firing temperature, and manufacturing methods of ferrite products with specific shapes and properties. No patent report on technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Composition by weight percentage in the following table, weigh strontium carbonate, ferric oxide, strontium sulfate, calcium fluoride and lead oxide, add 0.5wt% methyl cellulose, after wet ball milling, add hydroxyl iron powder and reduce Iron powder, mixing, spray granulation, dry pressing, drying, trimming, and firing to obtain products.

[0014] strontium carbonate

Ferric oxide

calcium fluoride

strontium sulfate

lead oxide

Hydroxy iron

Reduced iron

18.08

46.43

1.17

1.57

0.69

16.80

15.26

[0015] Some of the process parameters are: ball milling time: 36-48 hours, subject to the average particle size of the powder reaching 10 μm; mixing time: 2 hours; spherical hydroxyl iron powder: narrow particle size distribution range, good fluidity, and tap density High; Molding pressure: 30MPa; Firing system: 200°C-900°C Heating rate: 50°C / hour, maximum firing temperature: 1320°C, heat preservat...

Embodiment 2

[0018] Composition by weight percentage in the following table, weigh strontium carbonate, ferric oxide, strontium sulfate, calcium fluoride and lead oxide, add 0.5wt% methyl cellulose, after wet ball milling, add hydroxyl iron powder and reduce Iron powder, mixing, spray granulation, dry pressing, drying, trimming, and firing to obtain products.

[0019] strontium carbonate

Ferric oxide

calcium fluoride

strontium sulfate

lead oxide

Hydroxy iron

Reduced iron

21.08

43.43

1.17

1.47

0.79

19.80

12.26

[0020] Some of the process parameters are: ball milling time: 36-48 hours, subject to the average particle size of the powder reaching 10 μm; mixing time: 2 hours; spherical hydroxyl iron powder: narrow particle size distribution range, good fluidity, and tap density High; Molding pressure: 30MPa; Firing system: 200°C-900°C Heating rate: 50°C / hour, maximum firing temperature: 1320°C, heat preservat...

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Abstract

The invention discloses a method for reducing firing shrinkage of a strontium ferrite magnetic material, and a product prepared by the method. According to the method, partial ferric oxide powder can be replaced by hydroxy iron powder or reduced iron powder to change the formula composition, such that the firing shrinkage of the ferrite magnetic material is controlled so as to reduce the firing deformation rate of the product. According to the present invention, the deformation amount of the prepared product is small, the post-processing amount is small or the post-processing is not required,the product qualification rate is high, the production cost is reduced, and the method is suitable for the industrial mass production.

Description

technical field [0001] The invention belongs to the field of inorganic materials, and in particular relates to a method for reducing the firing shrinkage of strontium ferrite magnetic materials and a product thereof. Background technique [0002] Ferrite is an important magnetic functional ceramic material, which is widely used as a component in modern industry, high technology and other fields. The firing shrinkage of ferrite is relatively large, and the shrinkage varies with the forming method and the particle size of the raw material. Generally, it is in the range of 10% to 25% shrinkage. The large firing shrinkage directly leads to product deformation, which is difficult to achieve. Dimensional accuracy requirements for parts assembly often require post-processing such as grinding, cutting, and polishing of burned products. In the post-processing process, products with large deformation require a large amount of processing, and the ferrite material has high hardness and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 石棋
Owner JINGDEZHEN CERAMIC UNIV
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