CN102136329A - Iron-based composite soft magnetic material and preparation method thereof - Google Patents
Iron-based 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 relates to an iron-based composite soft magnetic material and a preparation method thereof using a powder metallurgy method to prepare soft magnetic parts of complex shapes in particular. The invention provides a composite soft magnetic material which takes an iron phosphate as an insulating compound and takes boric acid ester as a lubrication binder. The composite soft magnetic material consists of atomized iron-based powder, nanometer iron phosphate and the lubrication binder. The surfaces of the atomized iron-based powder articles are uniformly coated by a layer of nanometer iron phosphate and lubrication binder, wherein the lubrication binder is boric acid ester, and the lubrication binder is 0.01-1.5 percent of the atomized iron-based powder in percentage by weight; and the nanometer iron phosphate is 0.01-1.5 percent of the of the atomized iron-based powder in percentage by weight. The invention has simple preparation technique, low material cost, high density, and high magnetic flux density.
Description
Technical field
The invention belongs to field of powder metallurgy, be specifically related to a kind of iron-based compound soft magnetic material for preparing soft magnetic property parts with powder metallurgy process and preparation method thereof with complicated shape.
Background technology
Compare with traditional silicon steel stack technology, the soft magnetic powder metallurgical technology shows exclusive advantage when producing complicated form part.The parts of complicated shape can directly be produced after sintering process, and do not need expensive shaping processing, as turning, wash cut, boring or grinding etc.The soft magnetic material application is extensive, can be used for the stator of motor and the iron core of rotor, transformer and inductor etc.This material can be pressed knot after selecting examples of suitable lubricants and/or binding agent to coat iron-based powder, then heat treatment at a certain temperature or sintering.But selected lubricant is very crucial for the high density that realizes material and the pressed part demoulding.
Summary of the invention
The object of the present invention is to provide iron-based compound soft magnetic material of a kind of novel high-density, high magnetic strength and preparation method thereof, with ferric phosphate as insulating compound, borate as lubricated binding agent, can realize the demoulding that is easy to of the high density of material and pressed part.
In order to achieve the above object, the invention provides following technical scheme:
A kind of iron-based compound soft magnetic material is made up of atomizing iron-based powder, nano ferric phosphate and lubricated binding agent, and this atomizing iron-based powder particle surface evenly coats this nano ferric phosphate particle of one deck and lubricated binding agent; Wherein said lubricated binding agent is that borate is lubricated, and quality is the 0.01-1.5% of atomizing iron-based powder quality; The nano ferric phosphate quality is the 0.01-1.5% of atomizing iron-based powder quality.
Described atomizing iron-based powder is atomizing straight iron powder, atomizing iron nickel powder or its mixed powder, and the quality of atomizing iron nickel powder accounts for ratio≤9% of atomizing ferrous alloy powder quality in wherein atomize straight iron powder and the atomizing iron nickel powder mixed powder.
The particle size range of described atomizing iron-based powder satisfies: at least 30%, preferred at least 50% atomizing iron-based powder is made up of the particle that particle diameter surpasses 200 μ m, and particle diameter is greater than particle≤5% of 400 μ m, powder particle≤10% of particle diameter below 10 μ m.
Described nano ferric phosphate grain diameter≤100nm, preferred 10-50nm.
Described lubricated binding agent is a kind of in the following compounds:
Butyl borate, boric acid three n-propyls, triethyl borate, trimethylborate, the polyethylene glycol borate, the triethanolamine borate, triisopropanolamine ring borate, triisopropyl borate ester, the oleic acid diethyl amide borate, the poly glycol monomethyl ether borate, connection boric acid pinacol ester, boric acid three isobutyl esters, isopropyl alcohol pinacol borate, 4-nitrobenzene boric acid pinacol ester, polyoxyethylene glycerol borate fatty acid ester, polyoxyethylene glyceryl borate oleic acid ester, diglycerol borate oleic acid (stearic acid, laurate) ester, the preferred boric acid tributyl, boric acid three n-propyls, triethyl borate.
A kind of method for preparing above-mentioned iron-based compound soft magnetic material comprises the steps:
To atomize iron-based powder and nano ferric phosphate and lubricated binding agent fully is dissolved or dispersed in the organic solvent, makes atomizing ferrous alloy powder particle surface evenly coat this nano ferric phosphate of one deck and lubricated binding agent; To coat good atomizing ferrous alloy powder particle again and suppress under the pressure of 550-750MPa, the parts that suppress again at 500-600 ℃ of following vacuum annealing 30-180 minute, obtained required iron-based composite soft-magnetic parts at 120-200 ℃ of following vacuum annealing 10-60 minute.
Described encapsulation steps is that mechanical agitation is mixed coating, sonic oscillation coats, and places until organic solvent evaporation then.
Starting powder described atomizing iron-based powder can be atomizing before carrying out the coating of ferric phosphate and lubricated binding agent after also can be through the atomized powder after hydrogenation treatment or the phosphorylation processing.
Described pressing step is 50-60 ℃ of compacting down, or normal temperature compacting down.
Described organic solvent is a kind of in ethanol, isopropyl alcohol, acetone, the butanone, preferred alcohol.
Atomizing iron-based powder particle size range satisfies: at least 30%, preferred at least 50% iron-based powder is made up of the particle that particle diameter surpasses 200 μ m, and particle diameter accounts for 5% at most greater than the particle of 400 μ m, and the powder particle of particle diameter below 10 μ m is less than 10%.Selecting the ferrous alloy powder of suitable particle size, is the prerequisite that can obtain high density material.
Lubricated binding agent in the inventive method is selected from: butyl borate, boric acid three n-propyls, triethyl borate, trimethylborate, the polyethylene glycol borate, the triethanolamine borate, triisopropanolamine ring borate, triisopropyl borate ester, the oleic acid diethyl amide borate, the poly glycol monomethyl ether borate, connection boric acid pinacol ester, boric acid three isobutyl esters, isopropyl alcohol pinacol borate, 4-nitrobenzene boric acid pinacol ester, polyoxyethylene glycerol borate, polyoxyethylene glyceryl borate oleic acid ester, diglycerol borate oleic acid (stearic acid, laurate) ester, the preferred boric acid tributyl, boric acid three n-propyls, triethyl borate.Above-mentioned lubricated binding agent is dispersed in atomizing ferrous alloy powder particle surface, increases the flowability of ferrous alloy powder particle.The selected lubricated binding agent energy while of the present invention is as the release agent of profiled part.
The cladding process on atomizing ferrous alloy powder surface comprises in the inventive method: mechanical agitation is mixed coating, and sonic oscillation coats, and can also be that fluidized-bed process coats in principle.The advantage of mechanical agitation hybrid packet coating process is can be quick, large batch of coating; The sonic oscillation cladding process can guarantee that the iron powder powder surface coats the combined lubrication agent uniformly; Fluidized-bed process coats can be wrapped in the iron powder powder surface with the combined lubrication agent in enormous quantities, evenly and apace.
Organic solvent in the inventive method is selected ethanol, isopropyl alcohol, acetone or butanone, preferred alcohol for use.The effect of organic solvent is the even coating that can better help the combined lubrication agent.
In a word, the invention provides a kind of novel iron-based compound soft magnetic material and preparation method thereof.Its abundant, low price in raw material source, the cost of material is low, press knot pressure low, and density is higher.Advantages such as the preparation method has that technology is simple, the cost of material is low, and density height, magnetic flux density are big.
Embodiment
Below in conjunction with embodiment technical scheme of the present invention is further set forth:
Embodiment 1:
To atomize straight iron powder and iron nickel powder mixed powder as raw material, and the quality of the iron nickel powder that wherein atomizes accounts for 5% of atomizing ferrous alloy powder gross mass, and the atomizing ferrous alloy powder has the particle mean size between the 80-200 μ m, and the powder particle of granularity below 10 μ m is less than 10%.The iron phosphate grains (particle diameter 10-20nm) that accounts for the butyl borate of atomizing ferrous alloy powder quality 0.2% and will account for atomizing ferrous alloy powder quality 0.3% is joined in the iron-based powder, add in the organic solvent-acetone and fully mix, ultrasonator vibration 10 minutes, treat organic solvent evaporation again.With the pressure single shaft of 600MPa to being squeezed into the ring-type sample.Behind the extrusion operation, the parts that suppress are 200 ℃ of following vacuum annealings 30 minutes, and 600 ℃ of following heat treatment elements 60 minutes in a vacuum obtain composite soft-magnetic ring-type sample again, and its density is 7.47g/cm
3, magnetic strength B
8000Be 1.20T, maximum permeability μ
mBe 0.3mH/m.
Embodiment 2:
To atomize straight iron powder and iron nickel powder mixed powder as raw material, and wherein iron nickel powder quality accounts for 9% of atomizing ferrous alloy powder gross mass, and the atomizing ferrous alloy powder has the particle mean size between the 100-300 μ m, and the powder particle of granularity below 10 μ m is less than 5%.Boric acid three isobutyl esters that account for atomizing ferrous alloy powder quality 0.5% are joined in the iron-based powder with the 10-20nm ferric phosphate that accounts for atomizing ferrous alloy powder quality 0.1%, add in the organic solvent ethanol and fully mix, ultrasonator vibration 15 minutes, treat organic solvent evaporation again.With the pressure single shaft of 700MPa to being squeezed into the ring-type sample.Behind the extrusion operation, the parts that suppress are 150 ℃ of following vacuum annealings 30 minutes, and 500 ℃ of following heat treatment elements 40 minutes in a vacuum obtain composite soft-magnetic ring-type sample again, and its density is 7.58g/cm
3, magnetic strength B
8000Be 1.092T, maximum permeability μ
mBe 0.2mH/m.
Embodiment 3:
The straight iron powder powder that will atomize is as raw material, and this iron powder has the particle mean size between the 100-200 μ m, and the powder particle of granularity below 10 μ m is less than 9%.The poly glycol monomethyl ether borate that accounts for atomizing ferrous alloy powder quality 0.3% is joined in the iron powder powder with the 10-20nm ferric phosphate that accounts for atomizing ferrous alloy powder quality 0.05%, adding the organic solvent absolute ethyl alcohol fully mixes, ultrasonator vibration 15 minutes, treat organic solvent evaporation again.With the pressure single shaft of 650MPa to being squeezed into the ring-type sample.Behind the extrusion operation, the parts that suppress are 180 ℃ of following vacuum annealings 40 minutes, and 600 ℃ of following heat treatment elements 60 minutes in a vacuum obtain composite soft-magnetic ring-type sample again, and its density is 7.52g/cm
3, magnetic strength B
8000Be 1.22T, maximum permeability μ
mBe 0.1mH/m.
Embodiment 4:
The straight iron powder powder that will atomize is as raw material, and this iron powder has the particle mean size between the 100-300 μ m, and the powder particle of granularity below 10 μ m is less than 10%.The 10-20nm ferric phosphate that accounts for atomizing ferrous alloy powder quality 1.0% is joined in the iron powder powder with the butyl borate that accounts for atomizing ferrous alloy powder quality 1.3%, add in the organic solvent isopropyl alcohol and fully mix, ultrasonator vibration 20 minutes, treat organic solvent evaporation again.With the pressure single shaft of 600MPa to being squeezed into the ring-type sample.Behind the extrusion operation, the parts that suppress are 200 ℃ of following vacuum annealings 30 minutes, and 550 ℃ of following heat treatment elements 100 minutes in a vacuum obtain composite soft-magnetic ring-type sample again, and its density is 7.02g/cm
3, magnetic strength B
8000Be 0.879T, maximum permeability μ
mBe 0.1mH/m.
Embodiment 5:
To atomize straight iron powder and iron nickel powder mixed powder as raw material, and wherein iron nickel powder quality accounts for 4% of atomizing ferrous alloy powder gross mass, and ferrous alloy powder has the particle mean size between the 300-500 μ m, and the powder particle of granularity below 10 μ m is less than 10%.The adding of lubricant is implemented as follows: boric acid three n-propyls that will account for atomizing ferrous alloy powder quality 0.1% join in the iron-based powder with the 20-100nm ferric phosphate that accounts for atomizing ferrous alloy powder quality 0.2%, add in the organic solvent butanone and fully mix, ultrasonator vibration 15 minutes, treat organic solvent evaporation again.With the pressure single shaft of 600MPa to being squeezed into the ring-type sample.Behind the extrusion operation, the parts that suppress are 120 ℃ of following vacuum annealings 30 minutes, and 500 ℃ of following heat treatment elements 40 minutes in a vacuum obtain composite soft-magnetic ring-type sample again, and its density is 7.07g/cm
3, magnetic strength B
8000Be 1.02T, maximum permeability μ
mBe 0.1mH/m.
Embodiment 6:
To atomize straight iron powder and iron nickel powder mixed powder as raw material, and wherein iron nickel powder quality accounts for atomizing ferrous alloy powder gross mass 2%, and ferrous alloy powder has the particle mean size between the 100-300 μ m, and the powder particle of granularity below 10 μ m is less than 5%.The isopropyl alcohol pinacol borate that accounts for atomizing ferrous alloy powder quality 0.6% is joined in the iron-based powder with the nano ferric phosphate that accounts for atomizing ferrous alloy powder quality 0.2%, add in the organic solvent absolute ethyl alcohol and fully mix, ultrasonator vibration 15 minutes, treat organic solvent evaporation again.Under 60 ℃, with the pressure single shaft of 550MPa to being squeezed into the ring-type sample.Behind the extrusion operation, the parts that suppress are 200 ℃ of following vacuum annealings 15 minutes, and 500 ℃ of following heat treatment elements 40 minutes in a vacuum obtain composite soft-magnetic ring-type sample again, and its density is 7.23g/cm
3
Embodiment 7:
The straight iron powder powder that will atomize is as raw material, and this iron powder has the particle mean size between the 100-300 μ m, and the powder particle of granularity below 10 μ m is less than 5%.The butyl borate that accounts for atomizing ferrous alloy powder quality 0.1% is joined in the iron powder powder with the 10-50nm ferric phosphate that accounts for atomizing ferrous alloy powder quality 0.4%, add in the organic solvent absolute ethyl alcohol and fully mix, ultrasonator vibration 15 minutes, treat organic solvent evaporation again.Under 50 ℃ of conditions, with the pressure single shaft of 650Mpa to being squeezed into the ring-type sample.Behind the extrusion operation, the parts that suppress are 200 ℃ of following vacuum annealings 60 minutes, and 500 ℃ of following heat treatment elements 90 minutes in a vacuum obtain composite soft-magnetic ring-type sample again, and its density is 7.32g/cm
3
Embodiment 8:
The straight iron powder powder that will atomize is as raw material, and this iron powder has the particle mean size between the 100-500 μ m, and the powder particle of granularity below 10 μ m is less than 10%.The butyl borate that accounts for atomizing ferrous alloy powder quality 0.6% is joined in the iron powder powder with the 10-40nm ferric phosphate that accounts for atomizing ferrous alloy powder quality 0.5%, add in the organic solvent absolute ethyl alcohol and fully mix, ultrasonator vibration 10 minutes, treat organic solvent evaporation again.Under 60 ℃ of conditions, with the pressure single shaft of 650MPa to being squeezed into the ring-type sample.Behind the extrusion operation, the parts that suppress are 200 ℃ of following vacuum annealings 40 minutes, and 500 ℃ of following heat treatment elements 90 minutes in a vacuum obtain composite soft-magnetic ring-type sample again, and its density is 7.39g/cm
3
Embodiment 9:
The straight iron powder powder that will atomize is as raw material, and this iron powder has the particle mean size between the 200-300 μ m, and the powder particle of granularity below 10 μ m is less than 5%.The butyl borate that accounts for atomizing ferrous alloy powder quality 0.2% is joined in the iron powder powder with the nano ferric phosphate that accounts for atomizing ferrous alloy powder quality 1.0%, add in the organic solvent absolute ethyl alcohol and fully mix, ultrasonator vibration 20 minutes, treat organic solvent evaporation again.Under 60 ℃, with the pressure single shaft of 600MPa to being squeezed into the ring-type sample.Behind the extrusion operation, the parts that suppress are 150 ℃ of following vacuum annealings 45 minutes, and 600 ℃ of following heat treatment elements 150 minutes in a vacuum obtain composite soft-magnetic ring-type sample again, and its density is 7.22g/cm
3
Embodiment 10:
The straight iron powder powder that will atomize is as raw material, and this iron powder has the particle mean size between the 100-500 μ m, and the powder particle of granularity below 10 μ m is less than 10%.The butyl borate that accounts for atomizing ferrous alloy powder quality 1% is joined in the iron powder powder with the nano ferric phosphate that accounts for atomizing ferrous alloy powder quality 1%, add in the organic solvent absolute ethyl alcohol and fully mix, ultrasonator vibration 25 minutes, treat organic solvent evaporation again.With the pressure single shaft of 750MPa to being squeezed into the ring-type sample.Behind the extrusion operation, the parts that suppress are 200 ℃ of following vacuum annealings 30 minutes, and 500 ℃ of following heat treatment elements 120 minutes in a vacuum obtain composite soft-magnetic ring-type sample again, and its density is 7.2g/cm
3
Embodiment 11:
The straight iron powder powder that will atomize is as raw material, and this iron powder has the particle mean size between the 200-400 μ m, and the powder particle of granularity below 10 μ m is less than 5%.The nano ferric phosphate that accounts for atomizing ferrous alloy powder quality 1% is joined in the iron powder powder with the butyl borate that accounts for atomizing ferrous alloy powder quality 1.5%, add in the organic solvent absolute ethyl alcohol and fully mix, ultrasonator vibration 25 minutes, treat organic solvent evaporation again.Under 60 ℃ of conditions, with the pressure single shaft of 600MPa to being squeezed into the ring-type sample.Behind the extrusion operation, the parts that suppress are 150 ℃ of following vacuum annealings 30 minutes, and 500 ℃ of following heat treatment elements 180 minutes in a vacuum obtain composite soft-magnetic ring-type sample again, and its density is 7.41g/cm
3
Embodiment 12:
The straight iron powder powder that will atomize is as raw material, and this iron powder has the particle mean size between the 100-300 μ m, and the powder particle of granularity below 10 μ m is less than 10%.The nano ferric phosphate that accounts for atomizing ferrous alloy powder quality 1.5% is joined in the iron powder powder with the polyoxyethylene glycerol borate that accounts for atomizing ferrous alloy powder quality 0.01%, adding organic solvent fully mixes, ultrasonator vibration 20 minutes, treat organic solvent evaporation again.With the pressure single shaft of 500MPa to being squeezed into the ring-type sample.Behind the extrusion operation, the parts that suppress are 200 ℃ of following vacuum annealings 30 minutes, and 550 ℃ of following heat treatment elements 30 minutes in a vacuum obtain composite soft-magnetic ring-type sample again, and its density only is 6g/cm
3
Embodiment 13:
The straight iron powder powder that will atomize is as raw material, and this iron powder has the particle mean size between the 100-300 μ m, and the powder particle of granularity below 10 μ m is less than 10%.The 10-20nm ferric phosphate that accounts for atomizing ferrous alloy powder quality 0.01% is joined in the iron powder powder with the polyoxyethylene glycerol borate that accounts for atomizing ferrous alloy powder quality 0.01%, adding organic solvent fully mixes, ultrasonator vibration 20 minutes, treat organic solvent evaporation again.With the pressure single shaft of 500MPa to being squeezed into the ring-type sample.The parts that suppress are 200 ℃ of following vacuum annealings 30 minutes, and 550 ℃ of following heat treatment elements 30 minutes in a vacuum obtain composite soft-magnetic ring-type sample again, and its density only is 6.6g/cm
3
Embodiment 14:
The straight iron powder powder that will atomize carries out hydrogenation treatment earlier, and this iron powder has the particle mean size between the 100-300 μ m, and the powder particle of granularity below 10 μ m is less than 10%.The nano ferric phosphate that accounts for atomizing ferrous alloy powder quality 0.01% is joined in the iron powder powder with the polyoxyethylene glycerol borate that accounts for atomizing ferrous alloy powder quality 0.01%, add organic solvent and fully mix, mechanical agitation is 20 minutes again, treats organic solvent evaporation.Under 60 ℃ of conditions, with the pressure single shaft of 500MPa to being squeezed into the ring-type sample.Behind the extrusion operation, the parts that suppress are 200 ℃ of following vacuum annealings 60 minutes, and 550 ℃ of following heat treatment elements 30 minutes in a vacuum obtain composite soft-magnetic ring-type sample again, and its density only is 7.2g/cm
3
Embodiment 15:
The straight iron powder powder that makes water fogging carries out phosphorylation to be handled, and this iron powder has the particle mean size between the 100-300 μ m, and the powder particle of granularity below 10 μ m is less than 10%.The 10-20nm ferric phosphate that accounts for atomizing ferrous alloy powder quality 1.5% is joined in the iron powder powder with the polyoxyethylene glycerol borate that accounts for atomizing ferrous alloy powder quality 0.4%, add organic solvent and fully mix, mechanical agitation is 20 minutes again, treats organic solvent evaporation.Under 50 ℃ of conditions, with the pressure single shaft of 600MPa to being squeezed into the ring-type sample.Behind the extrusion operation, the parts that suppress are 200 ℃ of following vacuum annealings 10 minutes, and 550 ℃ of following heat treatment elements 100 minutes in a vacuum obtain composite soft-magnetic ring-type sample again, and its density only is 6.92g/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 make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed among the claim scope of the present invention.
Claims (10)
1. iron-based compound soft magnetic material is characterized in that: it is made up of atomizing iron-based powder, nano ferric phosphate and lubricated binding agent, and this atomizing iron-based powder particle surface evenly coats this nano ferric phosphate particle of one deck and lubricated binding agent; Wherein said lubricated binding agent is that borate is lubricated, and quality is the 0.01-1.5% of atomizing iron-based powder quality; The nano ferric phosphate quality is the 0.01-1.5% of atomizing iron-based powder quality.
2. material as claimed in claim 1, it is characterized in that: described atomizing iron-based powder is atomizing straight iron powder, atomizing iron nickel powder or its mixed powder, and the quality of atomizing iron nickel powder accounts for ratio≤9% of atomizing ferrous alloy powder quality in wherein atomize straight iron powder and the atomizing iron nickel powder mixed powder.
3. material as claimed in claim 1 or 2, it is characterized in that: the particle size range of described atomizing iron-based powder satisfies: at least 30%, preferred at least 50% atomizing iron-based powder is made up of the particle that particle diameter surpasses 200 μ m, particle diameter is greater than particle≤5% of 400 μ m, powder particle≤10% of particle diameter below 10 μ m.
4. material as claimed in claim 1 is characterized in that: described nano ferric phosphate grain diameter≤100nm, preferred 10-50nm.
5. material as claimed in claim 1, it is characterized in that: described lubricated binding agent is a kind of in the following compounds: butyl borate, boric acid three n-propyls, triethyl borate, trimethylborate, the polyethylene glycol borate, the triethanolamine borate, triisopropanolamine ring borate, triisopropyl borate ester, the oleic acid diethyl amide borate, the poly glycol monomethyl ether borate, connection boric acid pinacol ester, boric acid three isobutyl esters, isopropyl alcohol pinacol borate, 4-nitrobenzene boric acid pinacol ester, polyoxyethylene glycerol borate fatty acid ester, polyoxyethylene glyceryl borate oleic acid ester, diglycerol borate oleic acid (stearic acid, laurate) ester, the preferred boric acid tributyl, boric acid three n-propyls, triethyl borate.
6. a method for preparing iron-based compound soft magnetic material as claimed in claim 1 is characterized in that: comprise the steps:
To atomize iron-based powder and nano ferric phosphate and lubricated binding agent fully is dissolved or dispersed in the organic solvent, makes atomizing ferrous alloy powder particle surface evenly coat this nano ferric phosphate of one deck and lubricated binding agent; To coat good atomizing ferrous alloy powder particle again and suppress under the pressure of 550-750MPa, the parts that suppress again at 500-600 ℃ of following vacuum annealing 30-180 minute, obtained required iron-based composite soft-magnetic parts at 120-200 ℃ of following vacuum annealing 10-60 minute.
7. method as claimed in claim 6 is characterized in that: described encapsulation steps is that mechanical agitation is mixed coating, sonic oscillation coats, and places until organic solvent evaporation then.
8. method as claimed in claim 6 is characterized in that: the starting powder described atomizing iron-based powder can be atomizing before carrying out the coating of ferric phosphate and lubricated binding agent after also can be through the atomized powder after hydrogenation treatment or the phosphorylation processing.
9. method as claimed in claim 6 is characterized in that: described pressing step is 50-60 ℃ of compacting down, or normal temperature compacting down.
10. method as claimed in claim 6 is characterized in that: described organic solvent is a kind of in ethanol, isopropyl alcohol, acetone, the butanone, preferred alcohol.
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| KR100187611B1 (en) * | 1993-12-28 | 1999-06-01 | 오카모토 유지 | Powder mixture for use in pressing to prepare rare earth/iron-based sintered permanent magnet |
| CN100380537C (en) * | 2005-05-27 | 2008-04-09 | 罗计添 | Soft-magnetic composite material and process for making magnetic conduction component by using same |
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- 2011-06-08 CN CN2011101522166A patent/CN102360662A/en active Pending
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| CN104321839A (en) * | 2012-04-26 | 2015-01-28 | 香港科技大学 | Soft magnetic composite materials |
| CN104028762A (en) * | 2014-05-28 | 2014-09-10 | 浙江大学 | Preparation method of soft magnetic composite material |
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| CN105798287A (en) * | 2016-04-29 | 2016-07-27 | 河海大学 | Scattering method for surface covalent modification modification of nickel nanowires |
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| CN112166479A (en) * | 2018-05-30 | 2021-01-01 | 霍加纳斯股份有限公司 | Ferromagnetic powder composition |
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