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Manufacturing method of manganese-zinc ferrite magnetic core

A technology of manganese-zinc ferrite and a manufacturing method, which is applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc. Low flux density and other problems, to achieve the effect of improving electromagnetic performance and stability, good dimensional consistency, and solving joint magnetic leakage

Pending Publication Date: 2020-10-30
山东东泰方思电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Second, the magnetic core obtained by the existing preparation method has the problems of low magnetic flux density and poor dimensional consistency due to bonding.
Low magnetic flux density will reduce the DC superimposed inductance of the magnetic core, which will have a negative impact on the application of downstream customers
Since the splicing and bonding of magnetic cores to form larger magnetic cores is a common application, poor dimensional consistency will lead to high difficulty in mass production of magnetic cores, and it is difficult to precisely splice magnetic cores with magnetic cores, which hinders the production and application of magnetic cores. bring adverse effects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment prepares a cube large-size magnetic core with a length of 238 mm, a width of 80 mm, and a height of 38.1 mm;

[0051] 1) Ingredients: The magnetic powder is formulated according to the formula, with Fe 2 o 3 , Mn 3 o 4 , ZnO as raw material, Fe 2 o 3 , MnO, ZnO mole percent is 55.5mol%: 37.5mol%: 7mol%, obtain batching;

[0052] Then the ingredients are subjected to 2) wet mixing sand milling, 3) spray granulation; wherein, 2) wet mixing sand milling particle size control D50=1.2μm;

[0053] 4) Pre-firing: using a pusher kiln for pre-firing, with a pre-fired temperature of 855°C and a holding time of 1.7 hours;

[0054] After the pre-burning is completed, proceed to step 5) Secondary batching, 6) Secondary wet mixing and sanding; wherein, 6) The particle size control of the second wet mixing and sanding D50=1.2μm;

[0055] 7) Granulation: add PVA to granulate, add surfactant after granulation; Surfactant, the amount of surfactant added is 0.10%...

Embodiment 2

[0061] This embodiment prepares a cube large-size magnetic core with a length of 238 mm, a width of 80 mm, and a height of 38.1 mm;

[0062] 1) Ingredients: The magnetic powder is formulated according to the formula, with Fe 2 o 3 , Mn 3 o 4 , ZnO as raw material, Fe 2 o 3 , MnO, ZnO mole percent is 55.5mol%: 37.5mol%: 7mol%, obtain batching;

[0063] Then the ingredients are subjected to 2) wet mixing and sand grinding, and 3) spray granulation; wherein, 2) the particle size of wet mixing and sand grinding is controlled D50=1.1μm;

[0064] 4) Pre-firing: using a pusher kiln for pre-firing, with a pre-fired temperature of 860°C and a holding time of 1.5 hours;

[0065] After the pre-burning is completed, proceed to step 5) Secondary batching, 6) Secondary wet mixing and sanding; wherein, 6) The particle size control of the second wet mixing and sanding D50=1.1μm;

[0066] 7) Granulation: add PVA granulation to granulation, add surfactant after granulation; Add a surf...

Embodiment 3

[0072] This embodiment prepares the cube large size magnetic core of length 152mm, width 101mm, height 38.1mm;

[0073] 1) Ingredients: The magnetic powder is formulated according to the formula, with Fe 2 o 3 , Mn 3 o 4 , ZnO as raw material, Fe 2 o 3 , MnO, ZnO mole percent is 55.5mol%: 37.5mol%: 7mol%, obtain batching;

[0074] Then 2) wet mixing sand milling, 3) spray granulation; wherein, 2) wet mixing sand milling particle size control D50=1.2μm;

[0075] 4) Pre-firing: pre-fired with a pusher kiln, the pre-fired temperature is 850°C, and the holding time is 2 hours;

[0076] Then carry out steps 5) Secondary batching, 6) Secondary wet mixing and sanding; wherein, 6) The particle size of the second wet mixing and sanding is controlled D50=1.2μm;

[0077] 7) Granulation: add PVA to granulate, add surfactant after granulation; Surfactant, the amount of surfactant added is 0.08% of the mass of the magnetic powder;

[0078] Then go through step 8) aging, 9) pressi...

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Abstract

The invention discloses a manufacturing method of a manganese-zinc ferrite magnetic core and belongs to the technical field of composite ferrites. The preparation method comprises the following stepsof 1) burdening, 2) wet mixing and sanding, 3) spray granulation, 4) presintering, 5) secondary burdening, 6) secondary wet mixing and sanding, 7) spray granulation, 8) aging, 9) green body pressing and 10) sintering, wherein the particle sizes D50 of the step 2) and the step 6) are 1.0-1.5 microns, 4) presintering is conducted at 820-900 DEG C, and the temperature is kept for 1.5-3 hours, (7) inthe granulation process, PVA accounts for 0.3%-0.64% of the mass of the magnetic powder, a flow angle is smaller than or equal to 30 degrees, and a surfactant accounting for 0.05%-0.15% of the mass ofthe magnetic powder is added after granulation is completed, and (9) bidirectional pressing is adopted, and the bearing pressure of the powder is 1.5 T / cm<2> -1.7 T / cm<2>. By means of the method, theintegrally-formed large-specification magnetic core can be manufactured, the magnetic core is not prone to cracking in the forming and sintering process, and the rate of finished products is high.

Description

technical field [0001] The invention discloses a manufacturing method of a manganese-zinc ferrite core, which belongs to the technical field of composite ferrite. Background technique [0002] Manganese zinc ferrite core is made of MnO-ZnO-Fe 2 o 3 Composite ferrite composed of three main components. The material has the characteristics of high magnetic permeability, high saturation magnetic flux density, and low loss, and is widely used in household appliances, network communications, automotive electronics, aerospace and other fields. The large-scale magnetic core refers to the magnetic core with an external dimension of 100mm or more. [0003] The applicant found in the research that the existing manganese zinc ferrite core has the following problems in the preparation process: [0004] First, cracks are prone to occur in the production of existing large-scale magnetic cores, and it is difficult to manufacture integrated large-scale magnetic cores. The larger the siz...

Claims

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Application Information

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IPC IPC(8): H01F1/03H01F41/02C04B35/38C04B35/622C04B35/626C04B35/64C04B35/634
CPCH01F1/0315H01F1/0317H01F1/0313H01F41/0266H01F41/02C04B35/2658C04B35/622C04B35/62615C04B35/62695C04B35/64C04B35/63416C04B35/63424C04B2235/6586C04B2235/656C04B2235/6567C04B2235/96C04B2235/95
Inventor 黄卫刘云龙
Owner 山东东泰方思电子有限公司
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