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High-performance permanent magnetic ferrite and manufacturing method thereof

A technology for permanent ferrite and its manufacturing method, which is applied in the field of magnetic materials, can solve the problems of demagnetization and low squareness of SrCaLaCo ferrite, and achieve the effects of improving squareness, appropriate grain size, and uniform grains

Active Publication Date: 2015-01-07
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-performance permanent magnet ferrite with high magnetism and high squareness in order to solve the problem that the existing SrCaLaCo ferrite has a relatively low squareness, so the magnet easily causes demagnetization in the demagnetization field. body

Method used

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  • High-performance permanent magnetic ferrite and manufacturing method thereof
  • High-performance permanent magnetic ferrite and manufacturing method thereof
  • High-performance permanent magnetic ferrite and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Will Fe 2 o 3 Powder, CaCO 3 Powder, La 2 o 3 Powder, Co 2 o 3 powder, SrCO 3 Powders, all of which have a particle size of less than 5 μm and have the formula Sr 0.5-x Ca x La 0.5 (Fe 11.5 co 0.3 )O 19 The composition of the mixture; after ball milling, drying and sintering in a spark plasma sintering furnace, the sintering temperature is 1350 °C, the heating rate is 100 °C / min, and the holding time is 0.1 hour; after pre-calcination, it is crushed into an average particle size of 3-5 μm. burning material.

[0038] Weigh 450g pre-fired material, add H 3 BO 3 , graphene, nano silicon carbide, Co 2 o 3 , Calcium gluconate, add 650ml of water, carry out secondary ball milling for 20 hours, and add CaCO 3 hours before discharge 3 , SiO 2 , to obtain a slurry with an average particle size of 0.5 μm; when the slurry is dehydrated to a moisture content of 30-40%, it is molded in a magnetic field of 120000e, and the diameter of the formed body is 8cm, and the...

Embodiment 2

[0044] Will Fe 2 o 3 Powder, CaCO 3 Powder, La 2 o 3 Powder, Co 2 o 3 powder, SrCO 3 Powders, all of which have a particle size of less than 5 μm and have the formula Sr 0.2 Ca 0.3 La 0.5 (Fe 11.8-z co z )O 19 The composition of the mixture; after one ball milling, drying and sintering in a spark plasma sintering furnace, the sintering temperature is 1150°C, the heating rate is 100°C / min, and the holding time is 3 hours. After calcining, it is crushed into a calcined material with an average particle size of 3-5 μm.

[0045] Weigh 450g pre-fired material, add H 3 BO 3 , graphene, nano silicon carbide, Co 2 o 3 , Isomalt, then add 650ml of water, conduct secondary ball milling for 20 hours, and add CaCO 3 hours before discharge 3 , SiO 2 , to obtain a slurry with an average particle size of 0.5 μm; when the slurry is dehydrated to a water content of 30-40%, it is molded in a magnetic field of 120000e, and the diameter of the formed body is 8cm, and the height ...

Embodiment 3

[0051] Will Fe 2 o 3 Powder, CaCO 3 Powder, La 2 o 3 Powder, Co 2 o 3 powder, SrCO 3 Powders, all of which have a particle size of less than 5 μm and have the formula Sr 0.2 Ca 0.3 La 0.5 (Fe 11.47 co 0.33 )O 19 The composition of the mixture; after ball milling, drying and sintering in a spark plasma sintering furnace, the sintering temperature is 1120°C, the heating rate is 100°C / min, and the holding time is 2 hours; after pre-sintering, it is crushed into an average particle size of 3-5 μm. burning material.

[0052] Weigh 450g pre-fired material, add H 3 BO 3 , graphene, nano silicon carbide, Co 2 o 3 , erythritol, sorbitol, then add 650ml of water, carry out secondary ball milling for 20h, and add CaCO 3 , SiO 2 , to obtain a slurry with an average particle size of 0.5 μm; when the slurry is dehydrated to a moisture content of 30-40%, it is molded in a magnetic field of 12000Oe, and the diameter of the formed body is 8cm, and the height is 3cm; the green...

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Abstract

he invention relates to high-performance permanent magnetic ferrite. The molecular formula of the permanent magnetic ferrite is A<1-x-y>Ca<x>La<y>(Fe<11.8-z>Co<z>)O<19>, wherein the A represents one or two selected from Sr and Ba and must contain Sr; the x, the y and the z represent molar ratios; 0.01<=x<=0.3; 0.1<=y<=0.5; 0.3<1-x-y<0.5; 0.1<=z<=0.3; and 1.1<y / z<2.5. A high-performance magnet can be obtained by optimization of an M type ferrite formula and process optimization. A pre-sintering material prepared by discharge plasma is all M-phase and uniform in crystal grains and proper in crystal grain size. Rectangularity can be improved through a tempering process. The highest magnetic property of the magnet prepared by formula optimization and the tempering process can reach that: Br>=4700 Gs, Hcj>=5500 Oe and the rectangularity is higher than 90%.

Description

technical field [0001] The invention relates to the field of magnetic materials, in particular to a high-performance permanent magnet ferrite and a manufacturing method thereof. Background technique [0002] The magnetoplumbite type permanent magnet ferrite has good magnetic properties and is widely used in home appliance motors, automobile motors, and medical equipment. The comprehensive advantages have been clearly reflected, and the market demand has increased. High-performance strontium barium ferrite is the focus of research. [0003] Since the large-scale use of permanent ferrite in the 1970s, its performance has been steadily improved. The saturation magnetization of single barium or single strontium ferrite is limited to only 4650Gs, and its highest performance is difficult to exceed Br≥4200Gs. At the same time Hcj≥42000e. The La-Co mixed doping developed in strontium barium ferrite later greatly improved the comprehensive magnetic properties of M-type permanent m...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 吴云飞李军华金志洪胡江平李玉平
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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