CN101777407A - Method for improving magnetic permeability and consumption of amorphous core and composite core prepared by same - Google Patents
Method for improving magnetic permeability and consumption of amorphous core and composite core prepared by same Download PDFInfo
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- CN101777407A CN101777407A CN 201010132982 CN201010132982A CN101777407A CN 101777407 A CN101777407 A CN 101777407A CN 201010132982 CN201010132982 CN 201010132982 CN 201010132982 A CN201010132982 A CN 201010132982A CN 101777407 A CN101777407 A CN 101777407A
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Abstract
The invention provides a method for improving magnetic permeability and consumption of an amorphous core and a composite core prepared by the same. The improved method is to add ferrite powder into soft magnetic powder containing amorphous alloy powder serving as iron base in proportion, wherein the weight percentage of the ferrite is between 2 and 20 percent; the ferrite powder can be selected from manganese zinc ferrite or nickel zinc ferrite powder and the like; and the amorphous alloy powder can be near-spherical iron-based amorphous powder prepared by adopting an atomization method and flake iron-based amorphous powder prepared by adopting crushing method. The principle of the preparation method is that the granularity proportion of two kinds of powder is reasonably selected to ensure the volume V of mixed powder in loose state is less than the sum of amorphous volume and ferrite volume. The amorphous pressed product prepared by the method has dissipation reduced by over 100mW/cm3 (testing under conditions of 0.1T and 100kHz), and the magnetic permeability improved by over 5.
Description
Technical field
The invention belongs to the Metallic Functional Materials field, relate to a kind of method of amorphous core permeability and loss and composite core for preparing according to the method for improving.
Background technology
Metal current magnetic core mainly contains ferromagnetic powder core, Fe
85Si
9Al
6Magnetic core, Fe
50Ni
50Magnetic core, Fe
17Ni
81Mo
2The magnetic core, and in recent years the exploitation amorphous magnetic core, nanocrystalline magnetic core.These magnetic cores have characteristics separately, and its application also has nothing in common with each other.The ferromagnetic powder core material unavoidably can cause noise sometimes owing to magnetostrictive reason, is exactly the heat fading problems affect ferromagnetic powder core material useful life of ferrocart core material in addition.Fe
85Si
9Al
6The magnetic core is compared Fe with the ferromagnetic powder core
85Si
9Al
6Magnetic core price is high slightly, and loss is lower, and magnetostriction coefficient is low, and the noise in its course of work is also low, so this magnetic core has obtained using widely as the EMI inductance.Fe
50Ni
50The magnetic core has the highest anti-Dc bias ability.Iron nickel molybdenum magnetic core is that the magnetic permeability scope is the wideest in all magnetic cores, possess low-loss and high permeability simultaneously, but price is very high.Therefore the amorphous powder pressed product has appearred, try hard to substitute good comprehensive properties permalloy magnetic core, but the problem that exists is that the present business-like level of permeability is not higher than 60, seriously limited its range of application, loss is compared iron nickel molybdenum magnetic core and is not also existed advantage also to reduce the space of its application in addition.
Therefore, how to improve the permeability of amorphous powder pressed product and the price of the existing amorphous powder pressed product of reduction and will improve the application space of amorphous powder pressed product greatly.
Goal of the invention
The objective of the invention is the present situation that remains to be improved at amorphous powder pressed product permeability and loss, provide a kind of method of improving amorphous core permeability and loss and according to the composite core of the method preparation.
Summary of the invention
At above problem, we have designed a kind of method of improving amorphous powder pressed product permeability and loss, and utilize the improved composite core of the method obtained performance.Particular content comprises:
First: the solution of the present invention is for to add the Fe-based amorphous alloy soft magnetic powder according to a certain percentage with ferrite powder, and ferritic percentage by weight is 2-20%.Concrete steps are:
(1) it is good to have a ferromagnetic Fe-based amorphous powder weighing, when oxygen content in power during less than 3000ppm, can select earlier the amorphous powder passivation, the technology usable concentration of passivation adds thermal inactivation less than phosphate aqueous solution or the alcoholic solution of 5wt%, complete until solution evaporation, will be mixed into Fe-based amorphous powder after the ferrite powder weighing and mix then.Ferrite powder requires permeability to be higher than 2000, and the average diameter of ferrite powder when being not more than the amorphous powder particle mean size closely during contact the space form 15% of circumcircle diameter.Closely the space of contact is the powder formation of four sub-circulars generally speaking, the pairing diameter of ball that four point of contacts the when amorphous powder that is defined as four particle mean sizes of circumcircle diameter is in contact with one another are determined; When powder is sheet, closely the space of contact is that the cross section of the flakelike powder formation of three particle mean sizes is the inscribed circle diameter of the cylinder of isosceles triangle, the pairing diameter of circle that three point of contacts the when amorphous powder that is defined as three particle mean sizes of circumcircle diameter is in contact with one another are determined satisfies V＜V according to the volume under its loose dress state of the mixed powder of above method in addition
Amorphous+ V
FerriteMixed powder adds binding agent, insulating compound, lubricant etc. successively according to the preparation method of magnetic core, and at the certain pressure compacted under, anneals subsequently; The annealing temperature of the inventive method correspondence is different with other magnetic core annealing temperature, temperature is ℃ interval annealing of ferrite Curie temperature+10 ℃＜T＜amorphous crystallization temperature-20, annealing time was greater than 30 minutes, purpose is to realize stress relief annealing, realize that again ferrite generation paramagnetism changes, crystallization change does not take place in Fe-based amorphous soft magnetic powder simultaneously, thereby makes full use of the soft magnetic characteristic of the excellence of ferritic high permeability, low-loss and Fe-based amorphous powder.
(2) in addition, ferrite powder can be selected manganese-zinc ferrite or nickel-zinc ferrite powder etc., and amorphous powdered alloy can be to adopt the Fe-based amorphous powder of almost spherical of atomization method preparation and utilize the crush method preparation and the next Fe-based amorphous powder of sheet.
Second: reduce 100mW/cm when its loss ratio of composite core of utilizing above method to prepare adopts amorphous powder separately
3More than (at 0.1T, testing under the 100kHz condition), permeability improves more than 5.Reduce 100mW/cm when further, loss ratio adopts amorphous powder separately when amorphous powder is sphere
3More than (at 0.1T, testing under the 100kHz condition), permeability improves more than 5; Reduce 200mW/cm when loss ratio adopts amorphous powder separately when amorphous powder is sheet
3More than (at 0.1T, testing under the 100kHz condition), permeability improves more than 8.
Description of drawings
Fig. 1 is the typical pattern that adopts atomization preparation-Fe-based amorphous soft magnetic powder of 100-200 order.
Fig. 2 is the typical pattern that adopts crush method preparation-Fe-based amorphous soft magnetic powder of 100-200 order.
Fig. 3 closely contacts the schematic diagram in the space that forms when powder is sheet.
The schematic diagram in the space that tight contact formed when Fig. 4 was spherical when powder.
Embodiment
Embodiment 1
The present embodiment powder is Fe for the composition that adopts the atomization preparation
80Si
16B
4Fe-based amorphous soft magnetic powder and permeability be 3000 manganese-zinc ferrite, Fe-based amorphous soft magnetic powder is 1000g, manganese-zinc ferrite is 100g.The granularity of amorphous soft magnetic powder is-150 orders, its mean particle size D
50Be 25 μ m, oxygen content 2000ppm; Manganese-zinc ferrite is-300 orders, and Curie temperature is 260 ℃, its mean particle size D
50Be respectively 12 μ m, 8.8 μ m, 7.6 μ m, 3 μ m, at last 400 ℃ of vacuum annealings 1 hour.The powder that mixes is tested its performance, Fe-based amorphous soft magnetic powder is " volume ratio before and after mixing " with manganese-zinc ferrite volume sum with the ratio of the volume that mixes the back powder before mixing, test is put in the trial assembly of permeability electricity consumption sensing, and loss is tested with BH ac resistance analysis instrument.
The ratio of table 1 different grain size ferrite average diameter and space average diameter is to the improvement of performance
By last table as can be known: volume ratio improves simultaneously less than 1 o'clock permeability and loss before and after mixing, and to improve effect obvious for permeability when the ratio of ferrite average diameter and space average diameter is not more than 1.15.
Embodiment 2
The present embodiment powder is Fe for the composition that adopts the crush method preparation
80Si
16B
4Fe-based amorphous soft magnetic powder and permeability be 3000 manganese-zinc ferrite, Fe-based amorphous soft magnetic powder is 1000g, manganese-zinc ferrite is 100g.The granularity of amorphous soft magnetic powder is-150 orders, its mean particle size D
50Be 32 μ m, oxygen content 600ppm; Manganese-zinc ferrite is-300 orders, and Curie temperature is 260 ℃, its mean particle size D
50Be respectively 28.4 μ m, 20.7 μ m, 18.4 μ m, 10.2 μ m, at last 400 ℃ of vacuum annealings 1 hour.The powder that mixes is tested its performance, Fe-based amorphous soft magnetic powder is " volume ratio before and after mixing " with manganese-zinc ferrite volume sum with the ratio of the volume that mixes the back powder before mixing, test is put in the trial assembly of permeability electricity consumption sensing, and loss is tested with BH ac resistance analysis instrument.
The ratio of table 2 different grain size ferrite average diameter and space average diameter is to the improvement of performance
By last table as can be known: volume ratio improves simultaneously less than 1 o'clock permeability and loss before and after mixing, and to improve effect obvious for permeability when the ratio of ferrite average diameter and space average diameter is not more than 1.15; Volume ratio permeability greater than 1 time does not improve before and after mixing, but loss improves.
Embodiment 3
The present embodiment powder is Fe for the composition that adopts the atomization preparation
80Si
16B
4Fe-based amorphous soft magnetic powder and permeability be respectively 2000,3000,5000 nickel-zinc ferrite, Fe-based amorphous soft magnetic powder is 1000g, manganese-zinc ferrite is 100g.The granularity of amorphous soft magnetic powder is-150 orders, its mean particle size D
50Be 25 μ m, oxygen content 2000ppm; Nickel-zinc ferrite is-300 orders, and Curie temperature is 260 ℃, its mean particle size D
50Be respectively 7.2 μ m, 8.0 μ m, 8.8 μ m, at last 400 ℃ of vacuum annealings 1 hour.The powder that mixes is tested its performance, Fe-based amorphous soft magnetic powder is " volume ratio before and after mixing " with manganese-zinc ferrite volume sum with the ratio of the volume that mixes the back powder before mixing, test is put in the trial assembly of permeability electricity consumption sensing, and loss is tested with BH ac resistance analysis instrument.
The different permeability ferrites of table 3 are to the improvement of performance
By last table as can be known: the ferrite permeability is high more, and it is obvious more that powder pressed product permeability is improved ground, but its particle size of the ferrite of high permeability is also big more, and total principle is to mix the front and back volume ratio less than 1.
Embodiment 4
The present embodiment powder is Fe for the composition that adopts the atomization preparation
80Si
16B
4Fe-based amorphous soft magnetic powder and permeability be 3000 manganese-zinc ferrite, Fe-based amorphous soft magnetic powder is 1000g, manganese-zinc ferrite is 100g.The granularity of amorphous soft magnetic powder is-150 orders, its mean particle size D
50Be 25 μ m, oxygen content 2000ppm; Nickel-zinc ferrite is-300 orders, and Curie temperature is 260 ℃, its mean particle size D
50Be 7.2 μ m, at last respectively 500 ℃, 450 ℃, 400 ℃, 350 ℃, 300 ℃, 250 ℃, 200 ℃ vacuum annealings one hour.The powder that mixes is tested its performance, Fe-based amorphous soft magnetic powder is " volume ratio before and after mixing " with manganese-zinc ferrite volume sum with the ratio of the volume that mixes the back powder before mixing, test is put in the trial assembly of permeability electricity consumption sensing, and loss is tested with BH ac resistance analysis instrument.
Table 4 different annealing temperature is to amorphous powder pressed product Effect on Performance
By last table as can be known: along with annealing temperature raises, permeability increases gradually, and loss reduces gradually, and the permeability of the embodiment of the invention and loss all improve than the amorphous powder pressed product under corresponding temperature.
Embodiment 5
The present embodiment powder is Fe for the composition that adopts the atomization preparation
80Si
16B
4Fe-based amorphous soft magnetic powder and permeability be 3000 manganese-zinc ferrite, Fe-based amorphous soft magnetic powder is 1000g, manganese-zinc ferrite is respectively 10g, 20g, 50g, 100g, 200g.The granularity of amorphous soft magnetic powder is-150 orders, its mean particle size D
50Be 25 μ m, oxygen content 2000ppm; Manganese-zinc ferrite is-300 orders, and Curie temperature is 260 ℃, its mean particle size D
50Be 7.6 μ m, at last 400 ℃ of vacuum annealings 1 hour.The powder that mixes is tested its performance, Fe-based amorphous soft magnetic powder is " volume ratio before and after mixing " with manganese-zinc ferrite volume sum with the ratio of the volume that mixes the back powder before mixing, test is put in the trial assembly of permeability electricity consumption sensing, and loss is tested with BH ac resistance analysis instrument.
Table 5 different content ferrite is to the improvement of performance
By last table as can be known: high permeability is high more more, loss is more little for ferrite content, and it is obvious to improve effect.But when ferrite content too should the time occur mixing before and after volume ratio raise, be unfavorable for bringing into play the soft magnet performance of amorphous soft magnetic powder, therefore can not be higher than 20%.
Claims (3)
1. method of improving amorphous core permeability and loss, it is characterized in that: (1) improved method is for to add the Fe-based amorphous alloy soft magnetic powder in proportion with ferrite powder, ferritic percentage by weight is 2-20%, and the space forms 15% of circumcircle diameter when closely contacting when the average diameter of ferrite powder is not more than the amorphous powder particle mean size, and mixes the volume V＜V under the powder pine dress state of back
Amorphous+ V
Ferrite(2) ferrite powder is selected from manganese-zinc ferrite or nickel-zinc ferrite powder, and amorphous powdered alloy is selected from the Fe-based amorphous powder of almost spherical of atomization method preparation or utilizes the Fe-based amorphous powder of sheet of crush method preparation.
2. according to the described a kind of method of improving amorphous core permeability and loss of claim 1, it is characterized in that: ferrite powder is added the Fe-based amorphous alloy soft magnetic powder in proportion, ferritic percentage by weight is 2-20%, preferably less than 10%, the space forms 15% of circumcircle diameter when closely contacting when the average diameter of ferrite powder is not more than the amorphous powder particle mean size, and mixes the volume V＜V under the powder pine dress state of back
Amorphous+ V
FerriteThe powder that mixes according to above method is die mould Cheng Fenxin then, and in ferrite Curie temperature+10 ℃＜℃ interval annealing of T＜amorphous crystallization temperature-20, annealing time is for being not less than 30 minutes.
3. according to the prepared composite core of the described method of claim 1, it is characterized in that: reduce 100mW/cm when loss ratio adopts amorphous powder separately
3More than (at 0.1T, testing under the 100kHz condition), permeability improves more than 5; Reduce 100mW/cm when loss ratio adopts amorphous powder separately when amorphous powder is sphere
3More than (at 0.1T, testing under the 100kHz condition), permeability improves more than 5; Reduce 200mW/cm when loss ratio adopts amorphous powder separately when amorphous powder is sheet
3More than (at 0.1T, testing under the 100kHz condition), permeability improves more than 8.
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Citations (6)
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|---|---|---|---|---|
| EP0872856A1 (en) * | 1997-04-18 | 1998-10-21 | Matsushita Electric Industrial Co., Ltd. | Magnetic core and method of manufacturing the same |
| JP2005113169A (en) * | 2003-10-03 | 2005-04-28 | Matsushita Electric Ind Co Ltd | Composite sintered magnetic material, its production method, and magnetic element obtained by using the composite sintered magnetic material |
| CN1656575A (en) * | 2002-06-06 | 2005-08-17 | 罗伯特·博施有限公司 | Soft magnetic powder composite material, method for the production thereof and use of the same |
| CN101246773A (en) * | 2007-02-12 | 2008-08-20 | 北京有色金属研究总院 | High-efficiency soft magnetic material and method for producing the same |
| CN101325126A (en) * | 2007-06-14 | 2008-12-17 | 北京科技大学 | Composite slice type inductive element and preparation method thereof |
| CN101488389A (en) * | 2008-01-18 | 2009-07-22 | 柯昕 | Production method for novel magnetic core |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0872856A1 (en) * | 1997-04-18 | 1998-10-21 | Matsushita Electric Industrial Co., Ltd. | Magnetic core and method of manufacturing the same |
| CN1656575A (en) * | 2002-06-06 | 2005-08-17 | 罗伯特·博施有限公司 | Soft magnetic powder composite material, method for the production thereof and use of the same |
| JP2005113169A (en) * | 2003-10-03 | 2005-04-28 | Matsushita Electric Ind Co Ltd | Composite sintered magnetic material, its production method, and magnetic element obtained by using the composite sintered magnetic material |
| CN101246773A (en) * | 2007-02-12 | 2008-08-20 | 北京有色金属研究总院 | High-efficiency soft magnetic material and method for producing the same |
| CN101325126A (en) * | 2007-06-14 | 2008-12-17 | 北京科技大学 | Composite slice type inductive element and preparation method thereof |
| CN101488389A (en) * | 2008-01-18 | 2009-07-22 | 柯昕 | Production method for novel magnetic core |
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