Unlock instant, AI-driven research and patent intelligence for your innovation.

Permanent magnetic ferrite material with high radial and axial shrinkage consistency and preparation method thereof

A permanent magnet ferrite and ferrite material technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems affecting the magnetic properties of strontium ferrite materials, and achieve good consistency and improved magnetic properties. Effect

Active Publication Date: 2020-11-27
HENGDIAN GRP DMEGC MAGNETICS CO LTD
View PDF6 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the problem in the prior art that strontium ferrite materials have inconsistent radial and axial shrinkage amplitudes, which affect the magnetic properties of strontium ferrite materials, the purpose of the present invention is to provide a radial shrinkage and axial shrinkage consistency High permanent magnet ferrite material, so that the radial shrinkage of permanent magnet ferrite material is consistent with the axial shrinkage trend, and the magnetic properties of permanent magnet ferrite material are improved

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Permanent magnetic ferrite material with high radial and axial shrinkage consistency and preparation method thereof
  • Permanent magnetic ferrite material with high radial and axial shrinkage consistency and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A permanent magnet ferrite material with high radial and axial shrinkage consistency, its structural formula is Sr 0.14 La 0.5 Ca 0.36 Fe 3+ 10.8 co 0.4 o 19 , the preparation process is as follows:

[0040] (1) Take raw material Fe according to the ratio 2 o 3 , CaCO 3 , La 2 o 3 , SrCO 3 and Co 2 o 3 , mix uniformly to obtain the mixed raw material; add SiO of 0.1wt% permanent magnet ferrite material quality to the mixed raw material 2 powder, and then wet ball milling for 6 hours to obtain a red material with an average particle size of 0.7 μm;

[0041] (2) Dried the red material in an oven to remove moisture, then pre-pressed at 10MPa, placed it at 1260°C for 90 minutes, and then dry-type coarse crushing to obtain a pre-fired material with a particle size of 2 μm;

[0042] (3) Take 500g of the above-mentioned calcined material, and use SiO 2 and SrCO 3 The powder is added as a secondary process formula additive, SiO 2 The addition amount is 0.4wt% ...

Embodiment 2

[0046] A permanent magnet ferrite material with high radial and axial shrinkage consistency, its structural formula is Sr 0.66 La 0.24 Ca 0.1 Fe 3+ 10.3 co 0.1 o 19 , the preparation process is as follows:

[0047] (1) Take raw material Fe according to the ratio 2 o 3 , CaCO 3 , La 2 o 3 , SrCO 3 and Co 2 o 3 , mix uniformly to obtain the mixed raw material; add SiO of 0.05wt% permanent magnet ferrite material quality to the mixed raw material 2 powder, and then wet ball milling to 4 hours to obtain a red material with an average particle size of 0.9 μm;

[0048] (2) Dried the red material in an oven to remove moisture, then pre-pressed at 11MPa, pre-fired at 1200°C for 180 minutes, and then dry-type coarse crushing to obtain a pre-fired material with a particle size of 4 μm;

[0049] (3) Take 500g of the above-mentioned calcined material, and use SiO 2 and SrCO 3 The powder is added as a secondary process formula additive, SiO 2 The amount added is 0.3wt% of...

Embodiment 3

[0053] A permanent magnet ferrite material with high radial and axial shrinkage consistency, its structural formula is Sr 0.15 La 0.5 Ca 0.35 Fe 10.5 co 0.3 o 19 , the preparation process is as follows:

[0054] (1) Take raw material Fe according to the ratio 2 o 3 , CaCO 3 , La 2 o 3 , SrCO 3 and Co 2 o 3 , mix uniformly to obtain the mixed raw material; add SiO of 0.1wt% permanent magnet ferrite material quality to the mixed raw material 2 powder, and then wet ball milling for 5 hours to obtain a red material with an average particle size of 0.8 μm;

[0055] (2) Dried the red material in an oven to remove moisture, then pre-pressed at 10MPa, pre-fired at 1250°C for 120 minutes, and then dry-type coarse crushing to obtain a pre-fired material with a particle size of 3 μm;

[0056] (3) Take 500g of the above-mentioned calcined material, and use SiO 2 and SrCO 3 The powder is added as a secondary process formula additive, SiO 2 The amount added is 0.2wt% of the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of permanent magnetic ferrite materials. In view of the problem that the radial and axial shrinkage amplitudes of a strontium ferrite material are inconsistent, the invention discloses a permanent magnetic ferrite material with high radial and axial shrinkage consistency. The structural formula of the permanent magnetic ferrite material is Sr<1-x-beta>La<beta>Ca<x>Fe<3+><2n-y>Co<y>O<19>, n is 5.2-5.6, beta is greater than or equal to 0.24 and less than or equal to 0.5, x is greater than or equal to 0.1 and less than or equal to 0.36, and y is greater than or equal to 0.1 and less than or equal to 0.4; or the structural formula is Sr<1-x>La<x>Fe<3+><2n-y>Co<y>O<19>, n is 5.8-6.2, x is greater than or equal to 0.1 and less than or equal to 0.4, and y is greater than or equal to 0.05 and less than or equal to 0.3. SiO2 accounting for 0.2-0.4 wt% of the permanent magnetic ferrite material and SrCO3 accounting for 0.4-1.2 wt% of the permanent magnetic ferrite material are added in the secondary process formula. The ratio of radial shrinkage to axial shrinkage of the obtained permanent magnetic ferrite material is close to 1, so that the magnetic performance of the permanent magnetic ferrite material is improved.

Description

technical field [0001] The invention relates to the technical field of permanent magnet ferrite materials, in particular to a permanent magnet ferrite material with high radial and axial shrinkage consistency and a preparation method thereof. Background technique [0002] Permanent ferrite mainly refers to hexagonal M-type strontium ferrite or barium ferrite. The preparation process includes mixing and grinding the raw materials through a primary process, pre-calcining, adding additives for secondary process formula, fine grinding and pressing , and then sintered and cut to prepare. The performance of permanent magnet ferrite is related to the primary process and the secondary process. The ferrite pre-fired formed by the same primary sintering has great differences in performance produced by different secondary processes. In the prior art, a combination of calcium carbonate and silicon dioxide is generally added in the secondary process to control grain growth, improve crys...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622H01F1/03
CPCC04B35/2675C04B35/622C04B2235/3208C04B2235/3213C04B2235/3275C04B2235/3418C04B2235/6562C04B2235/6567H01F1/0315
Inventor 丁伯明胡良权叶华
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD