CN102390986B - Low-power-consumption MnZn ferrite material - Google Patents
Low-power-consumption MnZn ferrite material Download PDFInfo
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Abstract
The invention discloses a low-power-consumption MnZn ferrite material and a preparation method thereof. The ferrite material is characterized by comrpsiing main components and auxiliary components, wherein the main components comprise the following constituents in content in terms of oxide: 51-55mol% of Fe2O3, 0.8-16mol% of ZnO, and the balance of MnO, and the auxiliary components comprise the following constituents in content in terms of oxide: 0.005-0.035wt% of SiO2, 0.03-0.15wt% of CaO, 0.01-0.08wt% of In2O3, and 0.01-0.05wt% of WO3. The performances of the ferrite material are characterized in that: the initial permeability is 2800+/-25% at 25 DEG C, the power consumption of the ferrite material is smaller than 220mw/cm<3> under the conditions of 100KHz, 200mT and 100 DEG C, and the saturated magnetic flux density is more than 430mT at 100 DEG C.
Description
Technical field
The present invention relates to a kind of MnZn ferrite, relate in particular to a kind of low-power-consumption MnZn ferrite material and preparation method thereof.
Background technology
Along with complete electronic set to digitizing, multifunction and miniaturization development, the networking of electronic system forward, high speed and broadband future development, therefore, to magneticsubstance particularly MnZn Ferrite Material performance more and more higher requirement has been proposed.The coming years, along with the progressively realization of the fast development of automotive electronics and Next Generation Internet, next-generation mobile communications, DTV is commercial, greatly expanded the high-performance MnZn Ferrite Material magnetic core market requirement.
Automotive electronics is broadly divided into two large classes according to function, i.e. car body electronic system and vehicle electronics Controlling System (as vehicle-mounted CD/DVD sound system, GPS navigation system etc.).To the improving constantly of automobile operability, comfortableness and security requirement, automotive electronics is to future developments such as intelligent, integrated, information-based, networkings along with the human consumer.According to authoritative institution's prediction, the electronics in car accounts for 22% of car load value now, will rise to 35% by 2010.On some limousines, electronic product even will account for more than 50% of integral vehicle cost.Therefore automotive electronics is acknowledged as one of electronic industry of development potentiality now most.
On the other hand, along with network service and the art fast developments such as aerospace, satellite communications and satellite-navigation such as ISDN(Integrated Service Digital Network) (ISDN), local area network (LAN), wide area networks (WAN), become the huge electronics and information industry of market capacity.
Because above-mentioned field electronic technology is developed by leaps and bounds, require the MnZn Ferrite Material to have lower power consumption, higher saturation magnetic flux density and higher initial permeability in order to further reduce the volume of electronic devices and components, thereby make further miniaturization of complete electronic set.And the Ferrite Material of traditional excellent property can't satisfy above-mentioned requirements.
The present invention passes through great many of experiments, work out a new MnZn Ferrite Material system, and by adding trace element, to the Ferrite Material microstructure and performance is optimized and modification, thereby obtained a kind of reduce power consumption, high saturated flux density MnZn ferrite material, satisfied the demand of modern electronic technology develop rapidly.
Summary of the invention
The present invention seeks to: propose a kind of low-power-consumption MnZn ferrite material and preparation method.The performance index of material are reached: under 25 ℃ of conditions, the initial permeability of material is 2800 ± 25%; Under 100KHz, 200mT, 100 ℃ of conditions, the power consumption of material is less than 220mw/cm
3Under 100 ℃ of conditions, the saturation magnetic flux density of material is greater than 430mT.
Technical scheme of the present invention is: a kind of low-power-consumption MnZn ferrite material, this Ferrite Material comprises principal constituent Fe
2O
3, ZnO, MnO and add ancillary component, the principal constituent formula is: Fe
2O
3: 51～55mol%, ZnO:8～16mol%, MnO:30～39mol%; Described ancillary component comprises SiO
2, CaO, In
2O
3, WO
3
The preparation method of a kind of low-power-consumption MnZn ferrite material of the present invention comprises the following steps: 1) principal constituent is pressed formula Fe
2O
3: 51～55mol%, ZnO:8～16mol%, MnO:30～39mol%; Mixing, grinding, dry, pre-burning obtain the principal constituent through pre-burning; 2) mix together with the ancillary component that adds the grinding of holding concurrently through the principal constituent of pre-burning and make the mixing material that median size is 0.9～1.3 μ m, carry out subsequently drying; C) dried particles is pressed down at press to make density be 3.0 ± 0.2g/cm
3Blank, blank is put into clock hood type furnace, in oxygen partial pressure was 1～8% balanced atmosphere, sintering was 2～5 hours at 1250～1290 ℃ of temperature, namely obtains the ferrite finished product.
Ferrite Material formula system of the present invention, make the ferrite finished product obtain following performance index by coordinating corresponding preparation method: under 25 ℃ of conditions, the initial permeability of material is 2800 ± 25%; Under 100KHz, 200mT, 100 ℃ of conditions, the power consumption of material is less than 220mw/cm
3Under 100 ℃ of conditions, the saturation magnetic flux density of material is greater than 430mT.
A kind of low-power-consumption MnZn ferrite material preparation method's concrete steps: 1) with principal constituent Fe
2O
3, Mn
3O
4, ZnO adds and carries out sand milling in the sand mill that is added with in advance deionized water and then through spray drying granulation, 800～1000 ℃ of pre-burnings in rotary kiln or box-type furnace, obtain ferrite prefiring material; 2) ferrite prefiring material is added with ancillary component carry out sand milling in the sand mill that is added with in advance deionized water, obtain the ferrite slurry that median size is 1.0 ± 0.3 μ m, add subsequently 10% PVA solution (concentration is 10%) to carry out spray drying granulation, obtain ferrite powder; 3) ferrite powder being obtained density through the press compacting is 3.0 ± 0.2g/cm
3The ferrite blank, in clock hood type furnace, in oxygen partial pressure was 1～8% balanced atmosphere, sintering was 2～5 hours at 1250～1290 ℃ of temperature with blank.
As the stronger a kind of specific embodiment of practicality, relatively described principal constituent total amount in product, the content of standard substance is as follows separately in it for described auxiliary added ingredients, SiO
2: 0.005～0.035wt%, CaO:0.03～0.15wt%, In
2O
3: 0.01～0.08wt%, WO
3: 0.01～0.05wt%.
Result of study shows, SiO
2Content preferably be controlled between 0.005～0.05wt%, work as SiO
2Content during less than 0.005wt%, to improving the power consumption DeGrain, and work as SiO
2Content during greater than 0.035wt%, the Ferrite Material power consumption obviously rises.In ferrite, CaO content can not be too high, and excessive CaO can cause the discontinuous growth of ferrite crystal grains, thereby the Ferrite Material power consumption is obviously increased, and the material initial permeability is descended.During less than 0.03wt%, improve the Ferrite Material power consumption impact of performance not obvious when CaO content.The CaO optimum content that adds in the present invention is 0.03～0.15wt%.
The present invention finds through lot of experiments, adopts In
2O
3And WO
3Combination, it is as ancillary component and SiO
2Add together with CaO, can further improve the microstructure of Ferrite Material, reduce the power consumption of MnZn Ferrite Material, the present invention finds to add the In of 0.01～0.08wt%
2O
3And the WO of 0.01～0.05wt%
3Best results.
The invention has the beneficial effects as follows: obtained a kind ofly under 25 ℃ of conditions by the present invention, the initial permeability of material is 2800 ± 25%; Under 100KHz, 200mT, 100 ℃ of conditions, the power consumption of material is less than 220mw/cm
3Under 100 ℃ of conditions, the saturation magnetic flux density of material has satisfied the demand of modern electronic technology develop rapidly greater than the high-performance MnZn Ferrite Material of 430mT.
Embodiment
Below, based on embodiment explanation the present invention.
1) starting material mix: press with following composition of raw materials: Fe
2O
3: 51～55mol%, ZnO:8～16mol%, MnO:30～39mol% takes starting material;
2) sand milling:
Load weighted starting material are put into sand mill, and at the deionized water of weight such as adding, sand milling 0.5 hour in advance;
3) spray drying granulation:
Add approximately 10%PVA solution (concentration is 10%) in the starting material slip, carry out spray drying granulation one time;
4) pre-burning: a spray drying granulation powder is carried out pre-burning by rotary kiln, and burning temperature is 850～900 ℃;
5) impurity (composition) adds: add following ancillary component: SiO
2: 0.005～0.035wt%, CaO:0.03～0.15wt%, In
2O
3: 0.01～0.08wt%, WO
3: 0.01～0.05wt%.
6) secondary sand milling: ferrite prefiring material and above-mentioned ancillary component are put into sand mill, and the deionized water of weight such as adding in advance, sand milling 1.5 hours makes the mean particle size of Preburning material less than 1.3 μ m;
7) secondary spray drying granulation:
Add approximately 10%PVA solution (concentration is 10%) in ferrite slurry, carry out the secondary spray drying granulation;
8) moulding: secondary spray drying granulation ferrite powder is pressed into the ferrite blank;
9) sintering: the ferrite blank is put into clock hood type furnace, control by following sintering temperature curve and atmosphere: from room temperature to 600 ℃, this is the binder removal stage, heats up comparatively mild, and it is abundant that this is conducive to binder removal, 100～150 ℃/hr of temperature rise rate, air atmosphere; After binder removal finished, temperature rise rate was brought up to 200～300 ℃/hr, air atmosphere; In oxygen partial pressure was 1～8% balanced atmosphere, sintering was 2～5 hours at 1250～1290 ℃ of temperature.Insulation finishes the temperature-fall period to 1100 ℃ of left and right, and Control for Oxygen Content is 0.01～0.3%, 100～150 ℃/hr of rate of temperature fall; Since 1100 ℃, fast cooling arrives room temperature, 150～250 ℃/h of rate of temperature fall, and Control for Oxygen Content is below 0.01%.
Above-mentioned formula and preparation method can make Ferrite Material reach performance perameter of the present invention fully.The present invention will be further described below in conjunction with specific embodiment, for further illustrating beneficial effect of the present invention, enumerated comparative example 1, wherein: comparative example 1 correspondence be a kind of MnZn Ferrite Material of traditional excellent property, it is mainly used in switching mode power supply transformer or reactance coil is used relevant field.Its performance characteristic is: the power consumption under 100 ℃, 100KHz, 200mT condition is 285mW/cm
3Saturation magnetic flux density under 100 ℃ of conditions is usually in the 420mT left and right; Initial permeability under 25 ℃ of conditions is 2450 left and right.
Embodiment 1: take 53.1mol%Fe
2O
3, (the raw material form is Mn to 34.9mol%MnO
3O
4), 12mol%ZnO.Drop in the sand mill be added with in advance deionized water and grind, control median size 0.8 ± 0.2 μ m, once after the spraying at 900 ± 20 ℃ of temperature electricity consumption heating revolving kiln carry out pre-burning.Preburning material input sand mill carries out the secondary sand milling subsequently, and relatively described principal constituent content in sand grinding process adds pure water 35%, dispersion agent 0.008% and defoamer 0.005%, and adds additive: SiO
2: 0.035wt%, CaO:0.085wt%, WO
3: 0.05wt%, In
2O
3: 0.03wt%, the median size of controlling sand milling is 1.0 ± 0.2 μ m.Carry out at last the secondary spraying and obtain MnZn ferrite particle material powder.Get this particulate material moulding compacting φ 25mm * φ 15mm * 7.5mm, density is approximately 3.0 ± 0.2g/cm
3Annulus, the ferrite blank is put into clock hood type furnace, sintering is by controlling by following sintering temperature curve and atmosphere: from room temperature to 600 ℃, this is the binder removal stage, heats up comparatively mild, and it is abundant that this is conducive to binder removal, 50～150 ℃/hr of temperature rise rate, air atmosphere; After binder removal finished, temperature rise rate was brought up to 150～300 ℃/hr, air atmosphere; In oxygen partial pressure was 2.5% balanced atmosphere, sintering was 4 hours at 1260 ℃ of temperature; Finish temperature-fall period to 1100 ℃ of left and right from insulation, Control for Oxygen Content is 0.05～2%, 100～150 ℃/hr of rate of temperature fall; Since 1100 ℃, fast cooling arrives room temperature, 150～250 ℃/h of rate of temperature fall, and Control for Oxygen Content is below 0.01%.The product correlated performance is listed in table 1.
Embodiment 2: take 54.5mol%Fe
2O
3, (the raw material form is Mn to 35.5mol%MnO
3O
4), 10mol%ZnO.Drop in the sand mill be added with in advance deionized water and grind, control median size 0.8 ± 0.2 μ m, once after the spraying at 900 ± 20 ℃ of temperature electricity consumption heating revolving kiln carry out pre-burning.Preburning material input sand mill carries out the secondary sand milling subsequently, and relatively described principal constituent content in sand grinding process adds pure water 35%, dispersion agent 0.008% and defoamer 0.005%, and adds additive: SiO
2: 0.02wt%, CaO:0.05wt%, WO
3: 0.03wt%, In
2O
3: 0.05wt%,, the median size of controlling sand milling is 1.0 ± 0.2 μ m.Carry out at last the secondary spraying and obtain Mn-Zn ferrite particle material powder.Get this particulate material moulding compacting φ 25mm * φ 15mm * 7.5mm, density is approximately 3.0 ± 0.2g/cm
3Annulus, the ferrite blank is put into clock hood type furnace, sintering is by controlling by following sintering temperature curve and atmosphere: from room temperature to 600 ℃, this is the binder removal stage, heats up comparatively mild, and it is abundant that this is conducive to binder removal, 50～150 ℃/hr of temperature rise rate, air atmosphere; After binder removal finished, temperature rise rate was brought up to 150～300 ℃/hr, air atmosphere; In oxygen partial pressure was 3.0% balanced atmosphere, sintering was 4 hours at 1280 ℃ of temperature; Finish temperature-fall period to 1100 ℃ of left and right from insulation, Control for Oxygen Content is 0.05～2%, 100～150 ℃/hr of rate of temperature fall; Since 1100 ℃, fast cooling arrives room temperature, 150～250 ℃/h of rate of temperature fall, and Control for Oxygen Content is below 0.01%.The product correlated performance is listed in table 1.
Comparative example 1: by principal constituent formula (mol ratio): Fe
2O
3: 53.5mol%, ZnO:12.5mol%, MnO:34.0mol% takes Fe
2O
3, Mn
3O
4And ZnO.Drop in the sand mill that is added with in advance deionized water and grind, water content 40%, 0.5 hour sand milling time, after a mist projection granulating, electricity consumption heating revolving kiln carries out pre-burning under 900 degree with slip.Preburning material drops into and to be added with in advance the deionized water sand mill and to carry out the secondary sand milling subsequently, water content 30%, and in sand grinding process, relatively described principal constituent content, add CaO:0.03wt%, SiO
2: 0.01wt%, Nb
2O
5: 0.03wt%, ZrO
2: 0.03wt%, 1.5 hours sand milling time, the median size of controlling sand milling is 1.1 ± 0.3 μ m.Carry out at last the secondary spraying and obtain MnZn ferrite particle material powder.Get the annulus of this particulate material moulding compacting φ 25mm * φ 15mm * 7.5mm, green density is controlled to be 3.0 ± 0.2g/cm
3, sintering is by controlling by following sintering temperature curve and atmosphere: from room temperature to 600 ℃, this is the binder removal stage, heats up comparatively mild, and it is abundant that this is conducive to binder removal, 50～150 ℃/hr of temperature rise rate, air atmosphere; After binder removal finished, temperature rise rate was brought up to 150～300 ℃/hr, air atmosphere; 1325 ℃ of sintering temperatures are incubated 3 hours, and equilibrium oxygen partial pres-sure is 5%; Finish temperature-fall period to 1100 ℃ of left and right from insulation, Control for Oxygen Content is 0.05～2%, 100～150 ℃/hr of rate of temperature fall; Since 1100 ℃, fast cooling arrives room temperature, 150～250 ℃/h of rate of temperature fall, and Control for Oxygen Content is below 0.01%.The magnet ring performance that obtains is: the magnetic permeability of material under 25 ℃ is 2450; Saturation magnetic flux density under 100 ℃ of conditions is 420mT; Power consumption under 100 ℃, 100KHz, 200mT condition is 285mW/cm
3This is for being used for traditional switch supply transformer, the high-frequency and low-consumption Ferrite Material of excellent property.
Table 1
By as seen from Table 1, to compare with the conventional iron ferrite, Ferrite Material of the present invention has lower power consumption, higher saturation magnetic flux density and higher initial permeability.Under 25 ℃ of conditions, the initial permeability of material is 2800 ± 25%; Under 100KHz, 200mT, 100 ℃ of conditions, the power consumption of material is less than 220mw/cm
3Under 100 ℃ of conditions, the saturation magnetic flux density of material is greater than 430mT.This Ferrite Material has satisfied the demand of modern electronic technology develop rapidly.
Claims (1)
1. low-power-consumption MnZn ferrite material, it is characterized in that: this Ferrite Material comprises principal constituent and ancillary component, principal constituent content is calculated as with oxide compound: Fe
2O
3: 51～55mol%, ZnO:8～16mol%, surplus is MnO; Ancillary component content is calculated as with oxide compound: SiO
2: 0.005～0.035wt%, CaO:0.03～0.15wt%, In
2O
3: 0.01～0.08wt%, WO
3: 0.01～0.05wt%;
This Ferrite Material performance characteristic is: under 25 ℃ of conditions, the initial permeability of material is 2800 ± 25%; Under 100KHz, 200mT, 100 ℃ of conditions, the power consumption of material is less than 220mW/cm
3Under 100 ℃ of conditions, the saturation magnetic flux density of material is greater than 430mT.
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| CN102690122A (en) * | 2012-06-05 | 2012-09-26 | 宜宾盈泰光电有限公司 | Method for remedying rejected manganese-zinc ferrites by using atmosphere heat treatment |
| CN104124024A (en) * | 2014-06-25 | 2014-10-29 | 蚌埠市英路光电有限公司 | Magnesium-based rare earth ferromagnetic core material |
| CN112851328B (en) * | 2021-03-30 | 2022-06-24 | 横店集团东磁股份有限公司 | Manganese-zinc ferrite, preparation method and application thereof |
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|---|---|---|---|---|
| EP0551907A2 (en) * | 1992-01-14 | 1993-07-21 | Matsushita Electric Industrial Co., Ltd. | An oxide magnetic material |
| CN101388269A (en) * | 2008-07-11 | 2009-03-18 | 临沂中瑞电子有限公司 | Manganese zinc ferrite of high magnetic conductivity high saturation magnetic flux density high Curie temperature |
| CN101593595A (en) * | 2009-04-10 | 2009-12-02 | 临沂中瑞电子有限公司 | A kind of low-temperature sintering high performance soft magnetic ferrite material and manufacture method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2855990B2 (en) * | 1992-01-14 | 1999-02-10 | 松下電器産業株式会社 | Oxide magnetic material |
| JPH05335132A (en) * | 1992-06-01 | 1993-12-17 | Matsushita Electric Ind Co Ltd | Oxide magnetic body material |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0551907A2 (en) * | 1992-01-14 | 1993-07-21 | Matsushita Electric Industrial Co., Ltd. | An oxide magnetic material |
| CN101388269A (en) * | 2008-07-11 | 2009-03-18 | 临沂中瑞电子有限公司 | Manganese zinc ferrite of high magnetic conductivity high saturation magnetic flux density high Curie temperature |
| CN101593595A (en) * | 2009-04-10 | 2009-12-02 | 临沂中瑞电子有限公司 | A kind of low-temperature sintering high performance soft magnetic ferrite material and manufacture method |
Non-Patent Citations (2)
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| JP特开平5-335132A 1993.12.17 |
| JP特开平6-53023A 1994.02.25 |
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