CN102360663B - Composite soft magnetic material and preparation method thereof - Google Patents
Composite soft magnetic material and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the field of powder metallurgy, and particularly relates to a composite soft magnetic material with high density and high magnetic induction and a preparation method thereof. The composite soft magnetic material consists of atomized iron-based powder, a lubricating agent and a metal adhesion promoter, wherein the mass of the lubricating agent is 0.01-2 percent of that of the atomized iron-based powder; the mass of the metal adhesion promoter is 0.01-2 percent of that of the atomized iron-based powder; and the metal adhesion promoter and the lubricating agent uniformly wrap surfaces of atomized iron-based powder particles. The lubricating agent is active nano-calcium carbonate and/or nano-aluminium sesquioxide; and the metal adhesion promoter is titanate. The material and the method have the advantages of simple preparation process, low material cost, high density and high magnetic induction strength.
Description
Technical field
The invention belongs to field of powder metallurgy, be specifically related to a kind of compound soft magnetic material with powder metallurgy process preparation with highdensity, high magnetic strength and preparation method thereof.
Background technology
Soft magnetic material application is extensive, can be used for the stator of motor and the iron core of rotor, transformer and inductor etc.Compare with silicon steel stack technology, soft magnetic material has significant advantage, and particularly when manufacture has the soft magnetic property parts of complicated shape, its advantage is more obvious.This material can be tied by pressure after selecting the coated iron-based powder of proper lubrication agent and/or binding agent, then heat treatment at a certain temperature or sintering.Selected lubricant is very crucial for the high density and the pressed part demoulding that realize material simultaneously.The present invention proposes with activated Calcium carbonate as lubricant, it has lubricated and insulation property simultaneously, in order to obtain better highdensity soft magnetic material parts, can suitably add metal coupling agent as metal promoted stick, activated Calcium carbonate and metal coupling agent are coated ferrous powder granules surface, to reach good insulating properties.Meanwhile, activated Calcium carbonate is cheap, be easy to get, high lubricating effect.
Summary of the invention
The object of the present invention is to provide that a kind of preparation technology is simple, the cost of material is low, compound soft magnetic material that density is high, magnetic flux density is large and preparation method thereof.
In order to achieve the above object, the present invention is realized by following technical scheme:
A compound soft magnetic material, is comprised of atomization iron-based powder, lubricant and metal promoted stick, and metal promoted stick and lubricant are evenly coated on atomization iron-based powder particle surface; Wherein, lubricant is nm-class active calcium carbonate and/or nano-aluminium oxide, and metal promoted stick is titanate esters; The quality of described lubricant is the 0.01-2% of atomization iron-based powder quality, and the quality of metal promoted stick is the 0.01-2% of atomization iron-based powder quality.
Described atomization iron-based powder is atomization straight iron powder, atomization iron nickel powder or its mixed powder, and wherein, in the mixed powder of atomization straight iron powder and atomization iron nickel powder, the quality of atomization iron nickel powder accounts for ratio≤5% of atomization ferrous alloy powder quality.
The particle size range of described atomization iron-based powder meets: the particle that at least 30%, preferably at least 60% atomization iron-based powder is greater than 20 μ m by particle diameter forms, and particle diameter is greater than particle≤5% of 40 μ m, powder particle≤10% of particle diameter below 1 μ m.
In described lubricant, the granularity of activated Calcium carbonate is 10nm-2 μ m, preferred nanoscale (≤100nm), when lubricant is the hybrid lubricant of nano-aluminium oxide and activated Calcium carbonate, nano-aluminium oxide quality accounts for ratio≤10% of lubricant gross mass.
Described metal promoted stick is positive four butyl esters of metatitanic acid or tetraisopropyl titanate.
A method of preparing compound soft magnetic material, comprises the steps:
Atomization iron-based powder and lubricant and metal promoted stick are scattered in organic solvent, make atomization ferrous alloy powder particle surface evenly coated this lubricant of one deck and adhesion promoter; Again the atomization ferrous alloy powder particle being coated is suppressed under the pressure of 550-750MPa, the parts that suppress are vacuum annealing 10-60 minute at 120-200 ℃, the 30-180 minute that anneals under 500-700 ℃ of argon gas, nitrogen or vacuum protection atmosphere again, obtains required compound iron-based soft magnetic part; Wherein lubricant is activated Calcium carbonate and/or nano-aluminium oxide, and metal promoted stick is titanate esters.
Described atomization iron-based powder is starting powder or the atomized iron powder after hydrogenation treatment or phosphatizing treatment after water atomization being lubricated agent before coated.
Described encapsulation steps is that mechanical agitation is mixed coated or sonic oscillation is coated, then places until organic solvent evaporation.
Described pressing step is compacting at 50-60 ℃, or suppresses under normal temperature.
Described organic solvent is a kind of in ethanol, isopropyl alcohol, acetone, butanone, preferred alcohol.
Atomization iron-based powder particle size range should meet: the particle that at least 30%, preferably at least 60% atomization iron-based powder surpasses 20 μ m by granularity forms, and the particle that particle diameter is greater than 40 μ m accounts at most 5%, the powder particle no more than 10% of particle diameter below 1 μ m.Selecting the atomization iron-based powder of appropriate particle size, is one of prerequisite obtaining high density material.
Lubricant in the inventive method is activated Calcium carbonate, granularity is 10nm-2 μ m, preferred nanoscale (≤100nm), nano level activated Calcium carbonate particle can be dispersed in ferrous alloy powder particle surface, increase the mobility of ferrous alloy powder particle, improved the insulating properties of ferrous alloy powder particle surface simultaneously.The selected lubricant energy while of the present invention is as the release agent of profiled part.
In the inventive method, can obtain the more soft magnetic material of high density, high magnetic strength.
The total consumption of additive (comprising lubricant and adhesion promoter) in composite material wanted appropriateness.It is low that additive is crossed crimping material densification at least, causes composite material magnetic strength also not high; Non-magnetic additive is too much, can reduce composite material magnetic strength.
Atomization iron-based powder in the inventive method, before being coated, can directly adopt the former powder of atomization ferrous alloy powder and lubricant to be directly coated, and without preliminary treatment, also can carry out hydrogenation process processing to the former powder of atomization ferrous alloy powder.
In the inventive method, the cladding process on atomization iron-based powder surface comprises: mechanical agitation is mixed coated and sonic oscillation is coated, can be also that fluidized-bed process is coated in principle.The advantage that mechanical agitation is mixed cladding process is can be quick, large batch of coated.Sonic oscillation cladding process can guarantee the coated combined lubrication agent of iron-based powder surface uniform.Fluidized-bed process is coated can be wrapped in iron powder powder surface by combined lubrication agent in enormous quantities, evenly and rapidly.
Organic solvent in the inventive method is selected ethanol, isopropyl alcohol, acetone or butanone.The effect of organic solvent is better to help lubricant and metal promoted stick being evenly coated at ferrous alloy powder particle surface.
The ferrous alloy powder particle that is coated with lubricant and binding agent is suppressed under the pressure of 550-750MPa, can also can at 50-60 ℃, suppress at normal temperatures, preferably compacting at normal temperatures.
The parts that suppress are vacuum annealing 10-60 minute at 120-200 ℃, then under argon gas, nitrogen or vacuum protection condition, and the 30-180 minute that anneals at 550-600 ℃ obtains having high density, the compound iron-based soft magnetic part of high magnetic strength.
In a word, the invention provides a kind of compound soft magnetic material and preparation method, enrich in the raw material source of this compound soft magnetic material, low price, and the cost of material is low, press knot pressure low, and density is higher.Preparation method has the advantages such as technique is simple, the cost of material is low, and density is high, magnetic flux density is large.
Embodiment
Below in conjunction with embodiment, technical scheme of the present invention is further elaborated:
Embodiment 1:
Atomization straight iron powder and atomization iron nickel powder mixed powder are first carried out to hydrogenation process processing, wherein atomization iron nickel powder quality accounts for 3% of total atomization iron-based powder quality, the granularity of atomization iron-based powder accounts for 50% between 20-30 μ m, the particle that granularity is greater than 40 μ m accounts for 2%, and the powder particle of granularity below 1 μ m accounts for 10%.By accounting for the nm-class active calcium carbonate of atomization iron-based powder quality 0.2% and 0.05% positive four butyl esters of metatitanic acid, join in iron-based powder, add organic solvent-acetone fully to mix, then ultrasonator vibration 10 minutes, treat organic solvent evaporation.With the pressure single shaft of 750MPa to being squeezed into ring-type sample.After extrusion operation, at 120 ℃, vacuum annealing is 10 minutes, then heat treatment element 60 minutes at 600 ℃ in a vacuum, obtains composite soft-magnetic ring-type sample, and its density is 7.6g/cm
3, magnetic strength B
8000for 1.26T, maximum permeability μ
mfor 0.3mH/m.
Embodiment 2:
By atomization straight iron powder powder, as raw material, iron powder particle mean size accounts for 50% between 20-30 μ m, and the particle that granularity is greater than 40 μ m accounts for 2.5%, and the powder particle of granularity below 1 μ m accounts for 3%.Combined lubrication agent is nm-class active calcium carbonate and nano-aluminium oxide, and wherein nm-class active calcium carbonate quality accounts for 96% of combined lubrication agent gross mass.Positive four butyl esters of metatitanic acid that account for the combined lubrication agent of atomization iron-based powder quality 0.1% and account for atomization iron-based powder quality 0.1% are joined in iron powder, add organic solvent absolute ethyl alcohol fully to mix, be uniformly mixed 15 minutes, treat organic solvent evaporation.With the pressure single shaft of 600MPa to being squeezed into ring-type sample.After extrusion operation, at 200 ℃, vacuum annealing is 30 minutes, then heat treatment element 60 minutes at 600 ℃ in a vacuum, obtains composite soft-magnetic ring-type sample.Its density is 7.55g/cm
3, magnetic strength B
8000for 1.186T, maximum permeability μ
mfor 0.3mH/m.
Embodiment 3:
The mixed powder of atomization straight iron powder and atomization iron nickel powder is used as to raw material, wherein atomization iron nickel powder quality accounts for 1% of atomization iron-based powder gross mass, atomization iron-based powder particle mean size accounts for 30% between 20-30 μ m, the particle that granularity is greater than 40 μ m accounts for 4%, and the powder particle of granularity below 1 μ m accounts for 9%.Adding of lubricant is implemented as follows: by accounting for the nm-class active calcium carbonate of atomization iron-based powder quality 2.0% and 0.4% tetraisopropyl titanate, join in atomization iron-based powder, add in organic solvent-acetone and fully mix, ultrasonator vibration 15 minutes, treat organic solvent evaporation again.With the pressure single shaft of 650MPa to being squeezed into ring-type sample.After extrusion operation, at 180 ℃, vacuum annealing is 60 minutes, then heat treatment element 40 minutes at 500 ℃ in a vacuum, obtains composite soft-magnetic ring-type sample, and its density is 7.1g/cm
3, magnetic strength B
8000for 1.12T, maximum permeability μ
mfor 0.2mH/m.
Embodiment 4:
By atomization straight iron powder powder, as raw material, iron powder particle mean size accounts for 35% between 20-30 μ m, and the particle that granularity is greater than 40 μ m accounts for 3%, and the powder particle of granularity below 1 μ m accounts for 6%.By accounting for the nm-class active calcium carbonate of atomization iron-based powder quality 0.5% and 0.1% positive four butyl esters of metatitanic acid, join in iron powder, add in organic solvent absolute ethyl alcohol and fully mix, then ultrasonator vibration 10 minutes, treat organic solvent evaporation.With the pressure single shaft of 600MPa to being squeezed into ring-type sample.After extrusion operation, at 170 ℃, vacuum annealing is 30 minutes, then heat treatment element 90 minutes at 500 ℃ in a vacuum, obtains composite soft-magnetic ring-type sample, and its density is 7.39g/cm
3, magnetic strength B
8000for 1.236T, maximum permeability μ
mfor 0.3mH/m.
Embodiment 5:
By atomization straight iron powder powder, as raw material, iron powder particle mean size accounts for 45% between 25-40 μ m, and the particle that granularity is greater than 40 μ m accounts for 2%, and the powder particle of granularity below 1 μ m accounts for 5%.Combined lubrication agent is nm-class active calcium carbonate and nano-aluminium oxide, and wherein nm-class active calcium carbonate quality accounts for 99% of combined lubrication agent gross mass.Positive four butyl esters of metatitanic acid that account for the combined lubrication agent of atomization iron-based powder quality 0.1% and account for atomization iron-based powder quality 0.1% are joined in atomization iron-based powder, add in organic solvent absolute ethyl alcohol and fully mix, ultrasonator vibration 15 minutes, treat organic solvent evaporation again.With the pressure single shaft of 600MPa, to being squeezed into ring-type sample, after extrusion operation, at 120 ℃, vacuum annealing is 45 minutes, then heat treatment element 40 minutes at 500 ℃ in a vacuum, obtains composite soft-magnetic ring-type sample, and its density is 7.23g/cm
3, magnetic strength B
8000for 1.135T, maximum permeability μ
mfor 0.2mH/m.
Embodiment 6:
By atomization straight iron powder powder, as raw material, iron powder particle mean size accounts for 40% between 20-40 μ m, and the particle that granularity is greater than 40 μ m accounts for 2%, and the powder particle of granularity below 1 μ m accounts for 6%.In combined lubrication agent, nm-class active calcium carbonate quality accounts for 98% of lubricant gross mass, and all the other are nano-aluminium oxide.The tetraisopropyl titanate that accounts for the 0.1% combined lubrication agent of atomization iron-based powder quality and 0.01% joins in iron powder, adds in organic solvent isopropyl alcohol and fully mixes, then ultrasonator vibration 15 minutes, treat organic solvent evaporation.With the pressure single shaft of 500MPa to being squeezed into ring-type sample.After extrusion operation, at 160 ℃, vacuum annealing is 60 minutes, then in nitrogen heat treatment element 90 minutes at 500 ℃, obtain composite soft-magnetic ring-type sample, its density is 7.32g/cm
3.
Embodiment 7:
By atomization straight iron powder powder, as raw material, iron powder particle mean size accounts for 60% between 20-30 μ m, and the particle that granularity is greater than 40 μ m accounts for 5%, and the powder particle of granularity below 1 μ m accounts for 5%.By accounting for the nm-class active calcium carbonate of atomization iron-based powder quality 0.1% and 0.02% positive four butyl esters of metatitanic acid, join in iron powder, add in organic solvent butanone and fully mix, then ultrasonator vibration 20 minutes, treat organic solvent evaporation.Under 50 ℃ of conditions, with the pressure single shaft of 600MPa to being squeezed into ring-type sample.After extrusion operation, at 150 ℃, vacuum annealing is 40 minutes, then heat treatment element 150 minutes at 600 ℃ in a vacuum, obtains composite soft-magnetic ring-type sample, and its density is 7.22g/cm
3.
Embodiment 8:
By atomization straight iron powder powder, as raw material, iron powder particle mean size accounts for 40% between 20-40 μ m, and the particle that granularity is greater than 40 μ m accounts for 5%, and the powder particle of granularity below 1 μ m accounts for 7%.By accounting for the nm-class active calcium carbonate of atomization iron-based powder quality 0.5% and 0.1% positive four butyl esters of metatitanic acid, join in iron powder, add in organic solvent absolute ethyl alcohol and fully mix, then ultrasonator vibration 25 minutes, treat organic solvent evaporation.Under 50 ℃ of conditions, with the pressure single shaft of 650MPa to being squeezed into ring-type sample.After extrusion operation, at 200 ℃, vacuum annealing is 60 minutes, then in nitrogen heat treatment element 120 minutes at 500 ℃, obtain composite soft-magnetic ring-type sample, its density is 7.45g/cm
3.
Embodiment 9:
By atomization straight iron powder powder, as raw material, iron powder particle mean size accounts for 50% between 20-40 μ m, and the particle that granularity is greater than 40 μ m accounts for 2%, and the powder particle of granularity below 1 μ m accounts for 8%.By accounting for the nm-class active calcium carbonate of atomization iron-based powder quality 1.0% and 0.2% positive four butyl esters of metatitanic acid, join in iron powder, add in organic solvent absolute ethyl alcohol and fully mix, then ultrasonator vibration 25 minutes, treat organic solvent evaporation.Under 50 ℃ of conditions, with the pressure single shaft of 600MPa to being squeezed into ring-type sample.After extrusion operation, at 160 ℃, vacuum annealing is 15 minutes, then heat treatment element 180 minutes at 500 ℃ in a vacuum, obtains composite soft-magnetic ring-type sample, and its density is 7.41g/cm
3.
Embodiment 10:
By atomization straight iron powder powder, as raw material, iron powder particle mean size accounts for 45% between 20-30 μ m, and the particle that granularity is greater than 40 μ m accounts for 3%, and the powder particle of granularity below 1 μ m accounts for 1%.By accounting for the nm-class active calcium carbonate of atomization iron-based powder quality 0.5% and 2% positive four butyl esters of metatitanic acid, join in iron powder, add organic solvent absolute ethyl alcohol fully to mix, then ultrasonator vibration 15 minutes, treat organic solvent evaporation.Under 50 ℃ of conditions, with the pressure single shaft of 650MPa to being squeezed into ring-type sample.After extrusion operation, at 150 ℃, vacuum annealing is 15 minutes, then heat treatment element 40 minutes at 500 ℃ in a vacuum, obtains composite soft-magnetic ring-type sample, and its density is 7.6g/cm
3.
Embodiment 11:
By atomization straight iron powder powder, as raw material, iron powder particle mean size accounts for 45% between 20-30 μ m, and the particle that granularity is greater than 40 μ m accounts for 3%, and the powder particle of granularity below 1 μ m accounts for 8%.By accounting for the nm-class active calcium carbonate of atomization iron-based powder quality 2% and 0.4% positive four butyl esters of metatitanic acid, join in iron powder, add in the abundant absolute ethyl alcohol of organic solvent and mix, then ultrasonator vibration 25 minutes, treat organic solvent evaporation.With the pressure single shaft of 700MPa to being squeezed into ring-type sample.After extrusion operation, at 150 ℃, vacuum annealing is 50 minutes, then heat treatment element 100 minutes at 550 ℃ in a vacuum, obtains composite soft-magnetic ring-type sample, and its density is 7.37g/cm
3.
Embodiment 12:
By atomization straight iron powder powder, as raw material, iron powder particle mean size accounts for 50% between 20-40 μ m, and the particle that granularity is greater than 40 μ m accounts for 2%, and the powder particle of granularity below 1 μ m accounts for 9%.By accounting for the nm-class active calcium carbonate of atomization iron-based powder quality 1% and 0.4% positive four butyl esters of metatitanic acid, join in iron powder, add organic solvent fully to mix, then ultrasonator vibration 20 minutes, treat organic solvent evaporation.Under 50 ℃ of conditions, with the pressure single shaft of 750MPa to being squeezed into ring-type sample.After extrusion operation, at 120 ℃, vacuum annealing is 10 minutes, then in argon gas heat treatment element 100 minutes at 550 ℃, obtain composite soft-magnetic ring-type sample, its density is 7.6g/cm
3.
Embodiment 13:
By atomization straight iron powder powder, as raw material, iron powder particle mean size accounts for 50% between 20-30 μ m, and the particle that granularity is greater than 40 μ m accounts for 3%, and the powder particle of granularity below 1 μ m accounts for 9%.By accounting for the nm-class active calcium carbonate of atomization iron-based powder quality 1% and 0.4% positive four butyl esters of metatitanic acid, join in iron powder, add organic solvent fully to mix, then mechanical agitation 20 minutes, organic solvent evaporation treated.Under 50 ℃ of conditions, with the pressure single shaft of 750MPa to being squeezed into ring-type sample.After extrusion operation, at 120 ℃, vacuum annealing is 60 minutes, then in argon gas heat treatment element 100 minutes at 550 ℃, obtain composite soft-magnetic ring-type sample, its density is 7.2g/cm
3.
Embodiment 14:
By atomization straight iron powder powder phosphatizing treatment, iron powder particle mean size accounts for 50% between 20-40 μ m, and the particle that granularity is greater than 40 μ m accounts for 1%, and the powder particle of granularity below 1 μ m accounts for 8%.By accounting for the nm-class active calcium carbonate of atomization iron-based powder quality 0.01% and 2% positive four butyl esters of metatitanic acid, join in iron powder, add organic solvent fully to mix, then mechanical agitation 15 minutes, organic solvent evaporation treated.Under 60 ℃ of conditions, with the pressure single shaft of 750MPa to being squeezed into ring-type sample.After extrusion operation, at 200 ℃, vacuum annealing is 10 minutes, then in argon gas heat treatment element 30 minutes at 700 ℃, obtain composite soft-magnetic ring-type sample, its density is 6.9g/cm
3.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed among claim scope of the present invention.
Claims (13)
1. a compound soft magnetic material, is characterized in that: it is comprised of atomization iron-based powder, lubricant and metal promoted stick, and metal promoted stick and lubricant are evenly coated on atomization iron-based powder particle surface; Wherein, lubricant is nm-class active calcium carbonate and/or nano-aluminium oxide, and metal promoted stick is titanate esters; The quality of described lubricant is the 0.01-2% of atomization iron-based powder quality, and the quality of metal promoted stick is the 0.01-2% of atomization iron-based powder quality;
Compound soft magnetic material obtains by the following method: the atomization ferrous alloy powder particle being coated is suppressed under the pressure of 550-750MPa; the parts that suppress are vacuum annealing 10-60 minute at 120-200 ℃, then the 30-180 minute that anneals under 500-700 ℃ of argon gas, nitrogen or vacuum protection atmosphere.
2. material as claimed in claim 1, it is characterized in that: described atomization iron-based powder is atomization straight iron powder, atomization iron nickel powder or its mixed powder, wherein, in the mixed powder of atomization straight iron powder and atomization iron nickel powder, the quality of atomization iron nickel powder accounts for ratio≤5% of atomization ferrous alloy powder quality.
3. material as claimed in claim 1 or 2, it is characterized in that: the particle size range of described atomization iron-based powder meets: the particle that at least 30% atomization iron-based powder is greater than 20 μ m by particle diameter forms, particle diameter is greater than particle≤5% of 40 μ m, powder particle≤10% of particle diameter below 1 μ m.
4. material as claimed in claim 1 or 2, it is characterized in that: the preferable particle size scope of described atomization iron-based powder meets: the particle that at least 60% atomization iron-based powder is greater than 20 μ m by particle diameter forms, particle diameter is greater than particle≤5% of 40 μ m, powder particle≤10% of particle diameter below 1 μ m.
5. material as claimed in claim 1, is characterized in that: in described lubricant, the granularity of activated Calcium carbonate is 10nm-2 μ m.
6. material as claimed in claim 5, is characterized in that: the nanoscale that in described lubricant, the granularity of activated Calcium carbonate is≤100nm.
7. material as claimed in claim 1, is characterized in that: when lubricant is the hybrid lubricant of nano-aluminium oxide and activated Calcium carbonate, nano-aluminium oxide quality accounts for ratio≤10% of lubricant gross mass.
8. material as claimed in claim 1, is characterized in that: described metal promoted stick is positive four butyl esters of metatitanic acid or tetraisopropyl titanate.
9. a method of preparing compound soft magnetic material as claimed in claim 1, is characterized in that: comprise the steps:
Atomization iron-based powder and lubricant and metal promoted stick are scattered in organic solvent, make atomization iron-based powder coated with uniform this lubricant of one deck and adhesion promoter; Again the atomization iron-based powder being coated is suppressed under the pressure of 550-750MPa, the parts that suppress are vacuum annealing 10-60 minute at 120-200 ℃, the 30-180 minute that anneals under 500-700 ℃ of argon gas, nitrogen or vacuum protection atmosphere again, obtains required compound soft magnetic material;
Wherein lubricant is activated Calcium carbonate and/or nano-aluminium oxide, and metal promoted stick is titanate esters.
10. method as claimed in claim 9, is characterized in that: described atomization iron-based powder is starting powder or the atomized iron powder after hydrogenation treatment or phosphatizing treatment after water atomization being lubricated agent before coated.
11. methods as claimed in claim 9, is characterized in that: described encapsulation steps is that mechanical agitation is mixed coated or sonic oscillation is coated, then places until organic solvent evaporation.
12. methods as claimed in claim 9, is characterized in that: described pressing step is compacting at 50-60 ℃, or suppresses under normal temperature.
13. methods as claimed in claim 9, is characterized in that: described organic solvent is a kind of in ethanol, isopropyl alcohol, acetone, butanone.
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| CN1732059A (en) * | 2002-12-23 | 2006-02-08 | 霍加纳斯股份有限公司 | Soft magnetic powder composition comprising insulated particles and a lubricant selected from organo-silanes, -titanates, -aluminates and zirconates and a process for their preparation |
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| JP2004211129A (en) * | 2002-12-27 | 2004-07-29 | Jfe Steel Kk | Metal powder for powder magnetic core, and powder magnetic core using it |
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