CN100500783C - Inorganic insulating adhesive for soft magnet metal powder core and its preparation process - Google Patents
Inorganic insulating adhesive for soft magnet metal powder core and its preparation process Download PDFInfo
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- CN100500783C CN100500783C CNB2007100993372A CN200710099337A CN100500783C CN 100500783 C CN100500783 C CN 100500783C CN B2007100993372 A CNB2007100993372 A CN B2007100993372A CN 200710099337 A CN200710099337 A CN 200710099337A CN 100500783 C CN100500783 C CN 100500783C
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Abstract
The present invention provides one kind of inorganic insulating adhesive for soft magnetic metal powder core. The inorganic insulating adhesive consists of SiO2, Al2O3, ZrO2, mica powder and water mixed together, and possesses both insulating and adhering functions. The present invention also provides the method of using the inorganic insulating adhesive in preparing soft magnetic metal powder core. Using the inorganic insulating adhesive can result in high magnetic performance of the magnetic metal powder core and enhanced mechanical strength, and the soft magnetic powder core without organic matter contained has no ageing and performance degradation caused by heat.
Description
Technical field
The invention belongs to metal-powder alloy field, particularly a kind ofly do not contain the inorganic insulation caking agent that organic soft magnetic metal powder core is used, and adopt the inorganic insulation caking agent to prepare the method for soft magnetic metal powder core.
Background technology
Soft magnetic metal powder core is that soft-magnetic alloy powder and insulating compound, caking agent are mixed back compression moulding, and obtains through Overheating Treatment.At present, metal magnetic powder core mainly contains ferrocart core, iron-nickel alloy powder core, iron nickel-molybdenum alloy powder core, iron silicon aluminum alloy powder core, and the FeCuNbSiB of exploitation in recent years is an amorphous nano crystalline flour core.Soft magnetic metal powder core is a key element of making inductance component in inducer, especially high frequency, big electric current and the high-power circuit.The saturated magnetic induction of significant parameter, magnetic permeability, quality factor, power loss and the frequency response characteristic etc. of reflection soft magnetic metal powder core performance, outside the Pass having with metal alloy composition, alloy powder granularity etc., another important step that influences the powder core performance is exactly insulating compound and the caking agent that uses in the powder core.By adding insulating compound, can improve the resistivity of powder core, the high frequency characteristics of favourable raising powder core, reduce power loss, but the increase of insulating compound has improved powder in-core portion porosity, can reduce the saturated magnetic induction and the magnetic permeability of powder core, therefore the power density that can lose magnetic core.
Prior art generally adopts the coated processing of passivation of magnetic powder particle surface oxidation or surface insulation, adds organic adhesive or organic resinifying agent then, is pressed.As add polyimide insulative caking agent, epoxy resins insulation caking agent, silicon-insulation caking agent etc.For the situation that adopts organic adhesive, caking agent will be decomposed in follow-up powder core heat treatment process, and stays carbon-chain structure, undecomposed staying in the powder core, but after the organism of a part insulation bonding effect is decomposed, can reduce insulation and adhesive effect.The unfavorable factor of another one that adopts organic adhesive in addition be the powder core at work because of secular eddy current heat makes organism aging, thereby influence the stability of powder core performance.
Chinese invention patent ZN1516204A discloses a kind of " manufacture method of soft magnet silumin powder core ", it is characterized in that used insulating adhesive is the epoxies caking agent, a kind of as in 607 Resins, epoxy, 609 Resins, epoxy, W-6A magnetic caking agent, the W-6C magnetic caking agent, the diluent of caking agent is organic solvent dehydrated alcohol, acetone, vinyl acetic monomer.Under 600～800 ℃, heat-treat after the moulding.Under said temperature, caking agent has substantially all decomposed.
Japanese patent laid-open 9-74011 and spy open the manufacture method that flat 9-125108 discloses a kind of Fe-Si-Al magnetic core, it is characterized in that having adopted inorganic adhesive---water glass, also claim water glass.But do caking agent with water glass, in the heat treatment process after the moulding of powder core,, can cause defectives such as the powder core cracks because water glass at high temperature decomposes.
United States Patent (USP) 6827557 discloses the preparation method of a kind of amorphous, nano-crystal soft-magnetic powder core, it is characterized in that the insulating adhesive in the powder core is a polyimide, owing to will keep the non-crystalline state and the crystalline state nanometer of powder slug particle, therefore can only heat-treat being lower than under the crystallization temperature.Polyimide incomplete decomposing at low temperatures, therefore the thermal stability to the magnetic core will produce adverse influence.
Chinese patent CN1164709C discloses a kind of " preparation metal magnetic powder core insulating adhesive ", it is characterized in that this insulating adhesive is mixed through organic solvent diluting by chromic anhydride, mica, tetraethoxysilance, silicone resin.It is wide that this insulating adhesive is suitable for the magnetic composition range, and magnetic particle capability is stable, can significantly improve the quality factor of magnetic core.But this insulating adhesive remains the mixture of organism and inorganics.
Other similar powder core prepares patent and also has U.S. Pat P6419877 to adopt the organism thermoplastic resin to do the insulation caking agent, what Japanese patent laid-open 11-189803 adopted is organism polyvinyl alcohol and poly-butyral resin, and what Chinese patent CN1373481A, Chinese patent CN1232375C, Chinese patent CN1518011A adopted is organism polyimide/phenol resins, resol, silicone resin etc.
Comprehensive above-mentioned prior art, also do not have a kind of full-inorganic, heat treatment process not to decompose at present, can form low-temperature sintering, and consumption is few, the insulation adhesive effect is good, can satisfy magnetic core long term operation aging-resistant insulating adhesive and preparation and using method and occur or reported.
Summary of the invention
One of purpose of the present invention provides a kind of soft magnetic metal powder core inorganic insulation caking agent, this caking agent has insulation, bonding double effects, simultaneously, there is not pyrolysis process in this caking agent, helps improving the defective of intensity, density and the minimizing powder core of powder core.
Another object of the present invention provides a kind of method that adopts the inorganic insulation caking agent to prepare soft magnetic metal powder core, this method is applicable to the preparation of multiple soft-magnetic alloy powder core, particularly owing to adopted inorganic adhesive of the present invention, can no longer add other insulating compound on the one hand, reduce the interpolation of nonmagnetics, the magnetic property of favourable raising powder core is on the other hand in the heat treatment process of powder core, can strengthen adhesive effect, the physical strength of favourable raising powder core.
The invention provides a kind of soft magnetic-powder core of full-inorganic system, solved the powder core in use because of heating causes the powder core aging, the problem of degradation.
The present invention is by providing a kind of soft magnetic metal powder core with the inorganic insulation caking agent with provide a kind of two kinds of technical schemes of method that prepare soft magnetic metal powder core with the inorganic insulation caking agent to realize above-mentioned purpose.Inorganic insulation caking agent of the present invention has insulation and bonding effect, and its characteristics are that it is by SiO that the composition of the inorganic insulation caking agent invented is formed
2, Al
2O
3, ZrO
2Hydrate and mica powder mix, wherein: SiO
220～40%, preferred 25～35%, Al
2O
310～20%, preferred 12～20%, ZrO
22～8%, preferred 3～5%, mica powder 1～3%, preferred 1.5～2.5%, all the other are water.Therefore suspended particles have bigger specific surface area and surface energy near nanoscale in the hydrate soln, have stronger absorption property, can combine closely with metal powder, and cover the surface of metal powder granulates.The pH value of inorganic insulation caking agent is 6～10, has the wide potential of hydrogen scope of application, can adapt to acidity, alkalescence and neutral system.In the present invention can be according to the pre-treatment characteristics of metal powder, as the pH value of the passivation salt system of metal powder, adjust the pH value of insulating adhesive, and do not influence the pretreating effect of metal powder.Na in the insulating adhesive solution of the present invention
+Total amount is less than 0.1%, preferred Na
+Total amount is less than 0.05%, helps controlling receiving the remaining total amount of ionic in the powder core, and is favourable to the solidity to corrosion of powder core.The insulating adhesive viscosity in aqueous solution is 0.001～0.1PaS, preferred viscosity ranges 0.005～0.03PaS, the aqueous solution has good flowability and wetting property, after metal powder mixes, can combine very soon with metallic particles, and with the metallic particles coating, metallic particles is spaced from each other, and produces the insulating effect.The density range of insulating adhesive solution of the present invention is 1.0～2.5 gram/cubic centimetres, can do suitable adjustment by composition and the concentration of adjusting solution, and according to preferred composition, corresponding density range is 1.1～1.3 gram/cubic centimetres.
The method that adopts inorganic insulation caking agent of the present invention to prepare soft magnetic metal powder core comprises the steps: 1) metal magnetic is added carry out the surface passivation processing in dichromate or dichromate and the phosphoric acid salt mixing solutions, rinsing oven dry then forms the anodized insulation layer at powder surface; 2) adopt the water-reducible inorganic insulation caking agent of deionization to mix, and add lubricant with powder through the surface passivation insulation processing, wetting, dry after mixing; 3) compression moulding; 4) carry out sintering and thermal treatment, improve bonding strength, eliminate stress; 5) surface treatment, spraying insulation layer.
Metal magnetic of the present invention comprises the magnetic of one or more combined preparation in water atomization, aerosolization, mechanical mill, airflow milling, fast quenching, the chemical process, particularly adopt one or more the powder mix in Fe powder, Fe-Si-Al powder, Fe-Ni-Mo powder, Fe-Ni powder, the Fe-Cu-Nb-Si-B powder, the powder mix of one or more in ferrite powder and the above-mentioned powder, various permanent magnetic alloy powders, the powder mix of one or more in permanent magnetic alloy powder and the above-mentioned powder, but be not limited only to the powder of above-mentioned scope.
Metal-powder surface passivation treating processes feature is among the preparation method of the present invention, treatment solution is dichromate or dichromate, both mixed solutions of phosphoric acid salt, the concentration of solution is every kilogram of powder with solid dichromate or dichromate, both blended solid salt 6～16 grams of phosphoric acid salt, preferable range 8～12 grams, above-mentioned powder is added in the solution, and be heated at 80～100 ℃ and react, carry out rinsing and oven dry then, make the surface of metal-powder form oxide film.
The amount of every kilogram of magnetic inorganic insulation caking agent is 10～50ml in preparation method's step of the present invention, caking agent is diluted back and the metal-powder mixing of handling through surface passivation with deionized water, and adding molybdenumdisulphide or stearate lubricant, the amount that every kilogram of metal powder adds lubricant is 6～10 grams, fully dries being lower than under 120 ℃ the temperature behind the mixing.Because inorganic insulation caking agent of the present invention has good wetting property, therefore in actual implementation process, do not need metal powder is immersed in the adhesive solution, can powder be soaked into by stirring.Can reduce the water yield that drying process need be evaporated like this, shorten evaporation time.
Adopt preparation method of the present invention when carrying out the compression moulding of magnetic core, pressing mode is static compacting, dynamic a kind of in compacting or the hot pressing, and the dwell time can compression moulding under 0.02～60 ton/cm2 pressure greater than 5 seconds in the compacting.For atomized powder, the pressure of static compacting is at 0.2～0.4 ton/square centimeter, and wants suitable height for the powder pressure that quick-quenching method makes, and this is because the hardness of quenched powder is bigger, and for the metal-powder-core of ferrite powder or contain ferrite powder, pressing pressure can be lower than the pressure of atomized powder.If adopt dynamically compacting or hot pressing, pressure can reduce more than 50% so.
Sintering thermal treatment among the preparation method of the present invention is the sintering thermal treatment of carrying out under nitrogen protection, and treatment temp is 350～700 ℃, 0.5～4 hour treatment time, furnace cooling then.Present method is different with the situation of employing organic resin caking agent in the existing technology, heat-treats after the compression moulding of powder core in the prior art, discharges compacting stress, and caking agent will decompose, burn mistake simultaneously, and stay carbon or carbide.And among inorganic insulation caking agent of the present invention and the preparation method, after the compression moulding of powder core, carry out sintering thermal treatment, and just when thermal treatment discharges compacting stress, can produce the caking agent sintering process, strengthen bonding strength; Decomposition reaction can not take place in inorganic insulation caking agent of the present invention when sintering thermal treatment simultaneously, therefore can not take place crackle or rarefaction defect to occur because of producing decomposition reaction.And the method that adopts inorganic insulation caking agent of the present invention and prepare the magnetic core can prepare and not contain organic powder core, such magnetic core in use, can be because of containing organism in the powder core, because of the former of magnetic core eddy current heat thereby cause the aging and insulation effect of powder core to go down, make the magnetic core degradation when avoiding under high frequency, working.
Soft magnetic metal powder core of the present invention has insulation, bonding double effects with the inorganic insulation caking agent.Its method for preparing soft magnetic metal powder core is applicable to the preparation of multiple soft-magnetic alloy powder core.Owing to do not contain after organism and the thermal treatment residual carbochain in the powder core in the powder core, therefore, in heat treatment process, do not have obnoxious flavour to produce.Caking agent of the present invention not only is used for the metal magnetic powder core field, also can be used for other metal-powder, ferrite powder, permanent magnetic alloy powder field.
Embodiment
Below in conjunction with embodiment the present invention is illustrated in greater detail.
Embodiment 1: the Fe-Ni-Mo magnetic that the method for making water fogging makes, join powder by granularity; Wherein granularity-150+250 order powder 35%wt ,-250+325 order powder 30% wt ,-400 order powder 35%, the metal magnetic of above-mentioned grain size proportion is mixed, then Passivation Treatment is carried out on the metal magnetic surface.Passivation Treatment solution is potassium bichromate and potassiumphosphate mixing solutions, the concentration of solution is that every kilogram of metal powder restrains with dichromate, phosphoric acid salt blended solid salt 8, mixing solutions is poured in the deionized water that is heated to 80 ℃, be stirred to whole dissolvings, again metal magnetic is joined in whole dissolved mixing solutionss, and be heated at 80～100 ℃, rinsing and oven dry react the metal magnetic surface and form the anodized insulation layer then.By following weight percent preparing metal soft magnetic-powder core inorganic insulation caking agent: 35%SiO
2, 12%Al
2O
3, 3%ZrO
2, 1.5% mica, PH=7, density are 1.1 gram/cubic centimetres, viscosity 0.005Pa.S, Na+ total amount less than 0.001% the aqueous solution, the per kilogram metal magnetic adds the insulating adhesive 20ml for preparing, and add the stir back oven dry of 8 gram molybdenum disulfide lubricants, 80 ℃ of bake out temperatures need constantly stir during oven dry.Under 30MPa pressure, compression moulding is φ 13X φ 8X6mm ring.In the sintering thermal treatment temp is 420 ℃, and atmosphere is nitrogen, and the treatment time is to carry out sintering thermal treatment under the state of 30min.Adopt electric impedance analyzer that above-mentioned sample is carried out performance test at last, test result sees Table 1.
Table 1
| Frequency, KHz | 20 | 40 | 80 | 100 | 200 |
| Magnetic permeability | 124.0 | 121.68 | 121.26 | 120.67 | 118.62 |
| The Q value | 14.6 | 15.9 | 19.5 | 15.7 | 9.5 |
Test result in the table 1 is compared with existing Fe-Ni-Mo magnetic core, and it is good that the magnetic core of the present invention's preparation has the magnetic permeability frequency response characteristic, along with the raising of frequency, and the advantage that the magnetic permeability decay is little.
Embodiment 2: with the Fe-Si-Al powder that the aerosolization method makes, join powder by granularity; Wherein granularity-150+250 order powder 30%wt ,-250+325 order powder 35%wt ,-400 order powder 35%, the metal magnetic of above-mentioned grain size proportion is mixed, then Passivation Treatment is carried out on the metal-powder surface.Inactivating treatment liquid is potassium bichromate and phosphoric acid mixing solutions, the concentration of solution is that every kilogram of metal powder restrains with potassium bichromate 12, phosphoric acid 0.5ml, mixing solutions is inserted in the deionized water that is heated to 80 ℃, be stirred to whole dissolvings, metal magnetic joined in whole dissolved mixing solutionss again, and be heated at 80～100 ℃, rinsing and oven dry react the metal magnetic surface and form the anodized insulation layer then.By following weight percent preparing metal soft magnetic-powder core inorganic insulation caking agent: 30%SiO
2, 15%Al
2O
3, 4%ZrO
2, 2% mica part, PH=8, density are 1.25 gram/cubic centimetres, viscosity 0.015Pa.S, Na+ total amount less than 0.0011% the aqueous solution, the per kilogram metal powder adds the insulating adhesive 20ml for preparing, and add the back oven dry that stirs of 8 gram Zinic stearas lubricants, 80 ℃ of bake out temperatures need constantly stir during oven dry.Under 25Mpa pressure, be pressed into φ 13X φ 8X6mm ring.500 ℃ of sintering thermal treatment temps, atmosphere is nitrogen, and the treatment time is to carry out sintering thermal treatment under the state of 60min.Adopt electric impedance analyzer that above-mentioned sample is carried out performance test at last, test result sees Table 2.
Table 2
| Frequency | 20KHz | 100KHz | 400KHz | 800KHz | 1MHz | 2MHz |
| Magnetic permeability | 81.2 | 80.39 | 79.09 | 75.41 | 73.36 | 61.88 |
| The Q value | 15.6 | 24.41 | 9.81 | 5.1 | 4.23 | 2.49 |
Compare with existing Fe-Si-Al magnetic core, the Fe-Si-Al magnetic core of the present invention's preparation has higher magnetic permeability, and decays less than 24% up to 2MHz frequency lower frequency.
Embodiment 3: with the Fe3Cu68Mn2Nb2Si12B13 amorphous ribbon that quick quenching technique obtains, carry out crystallization and handle 460 ℃ of treatment temps, 30 minutes treatment times under nitrogen protection.The powder process in ball mushroom machine of strip after the crystallization, obtains the amorphous nano-crystalline magnetic at 24 hours ball milling time.After the classification of amorphous nano-crystalline magnetic, join powder by granularity, wherein granularity-150+250 order powder 26%wt ,-250+325 order powder 34%wt ,-400 order powder 40%, the amorphous nano crystalline flour of above-mentioned grain size proportion is mixed, then metal-powder is carried out surface passivation and handles.Inactivating treatment liquid is potassium bichromate and phosphoric acid mixing solutions, the concentration of solution is that every kilogram of metal powder restrains with potassium bichromate 9, phosphoric acid 0.6ml, mixing solutions is inserted in the deionized water that is heated to 80 ℃, be stirred to whole dissolvings, metal-powder joined in whole dissolved mixing solutionss again, and be heated at 80～100 ℃, rinsing and oven dry react the metal magnetic surface and form the anodized insulation layer then.By following weight percent preparing metal soft magnetic-powder core inorganic insulation caking agent: 25%SiO
2, 18%Al
2O
3, 5%ZrO
2, 2.5% mica powder, PH=9, density are 1.3 gram/cubic centimetres, viscosity 0.03Pa.S, Na+ total amount less than 0.0017% the aqueous solution, the per kilogram metal powder adds inorganic insulation caking agent 30ml, and add the back oven dry that stirs of 4 gram molybdenumdisulphide, 4 gram Zinic stearas lubricants, 80 ℃ of bake out temperatures need constantly stir during oven dry.At 20 tons/cm
2Under the pressure, be pressed into φ 13X φ 8X6mm ring.420 ℃ of sintering thermal treatment temps, atmosphere is nitrogen, and the treatment time is to carry out sintering thermal treatment under the 30min state.Adopt electric impedance analyzer that above-mentioned sample is carried out performance test at last, test result sees Table 3.
Table 3
| Frequency | 20KHz | 100KHz | 400KHz | 800KHz | 1MHz | 2MHz |
| Magnetic permeability | 43.58 | 42.67 | 42.23 | 42.32 | 42.21 | 41.84 |
| The Q value | 9.66 | 42.39 | 40.59 | 31.18 | 25.92 | 14.79 |
The test result of table 3 shows, adopts the present invention, and powder is compression moulding at normal temperatures, the fast quenching amorphous attitude powder bigger for hardness still can obtain higher magnetic permeability, compared with prior art, the present invention less than 4%, reaches the effect of permanent magnetic conduction in the decay of high frequency lower frequency.
Embodiment 4: insulating adhesive of the present invention is carried out the temperature senile experiment, and experimental temperature is 120 ℃, and the treatment time is respectively 20 days, 40 days, and 60 days.The Fe-Ni-Mo magnetic core product that laboratory sample prepares for the method that adopts embodiment 1.Sample through the said temperature senile experiment carries out performance test, and test result sees Table 4.
Table 4
Prove by the high temperature ageing experimental result in the table 4, adopt the magnetic core of inorganic adhesive of the present invention and method preparation to have high-temperature aging resisting performance preferably.
Can see by above embodiment, adopt inorganic insulation caking agent of the present invention to prepare soft magnetic metal powder core, can obtain the good powder core device of frequency response characteristic, in embodiment 2 and 3, under the 2MHz high frequency, magnetic permeability changes little from low frequency.In addition, by the temperature senile experiment, the essentially no variation of the performance of powder core.
The present invention is not limited to described summary of the invention and embodiment, by to inorganic insulation caking agent of the present invention and adopt this inorganic insulation caking agent to prepare method and the combination of features and the improvement of powder core, and the professional and technical personnel is to using the improvement in field, do not break away from and runs counter to claim scope of the present invention.
Claims (18)
1, a kind of soft magnetic metal powder core inorganic insulation caking agent is characterized in that this inorganic insulation caking agent is by SiO
2, Al
2O
3, ZrO
2, mica powder and water mixes; Its composition consists of (weight %):
SiO
2： 20％～40％，
Al
2O
3： 10％～20％，
ZrO
2： 2％～8％，
Mica powder: 1%～3%,
All the other are water.
2, inorganic insulation caking agent according to claim 1 is characterized in that wherein composition is (weight %):
SiO
2 25％～35％
Al
2O
3 12％～20％
ZrO
2 3％～5％
Mica powder 1.5%～2.5%
All the other are water.
3, inorganic insulation caking agent according to claim 1, the pH value that it is characterized in that the inorganic insulation caking agent is 6～10.
4, inorganic insulation caking agent according to claim 1 is characterized in that Na in the inorganic insulation caking agent
+Total amount less than 0.1%.
5, inorganic insulation caking agent according to claim 1, the viscosity that it is characterized in that the inorganic insulation caking agent is 0.001～0.1PaS.
6, inorganic insulation caking agent according to claim 1, the density that it is characterized in that the inorganic insulation caking agent is 1.0～2.5 gram/cubic centimetres.
7, inorganic insulation caking agent according to claim 1, the pH value that it is characterized in that the inorganic insulation caking agent is 7～9.
8, inorganic insulation caking agent according to claim 1 is characterized in that Na in the inorganic insulation caking agent
+Total amount less than 0.05%.
9, inorganic insulation caking agent according to claim 1, the viscosity that it is characterized in that the inorganic insulation caking agent is 0.005～0.03PaS.
10, inorganic insulation caking agent according to claim 1, the density that it is characterized in that the inorganic insulation caking agent is 1.1～1.3 gram/cubic centimetres.
11, adopt the described soft magnetic metal powder of claim 1 core to prepare the method for soft magnetic metal powder core, it is characterized in that processing step is as follows with the inorganic insulation caking agent:
1) metal magnetic is joined carries out surface passivation in the mixed treatment solution of dichromate or dichromate and phosphoric acid salt and handle;
2) will mix with the inorganic insulation caking agent with the described soft magnetic metal powder of claim 1 core through the metal magnetic of surface passivation insulation processing, and add evenly back oven dry of mix lubricant;
3) with above mixture compression moulding;
4) carry out sintering and thermal treatment, eliminate stress;
5) carry out surface treatment, spraying insulation layer.
12, the method for preparing soft magnetic metal powder core according to claim 11 is characterized in that used metal magnetic is the powder of one or more combined preparation in water atomization, aerosolization, mechanical mill, airflow milling, the chemical process.
13, the method for preparing soft magnetic metal powder core according to claim 11, it is characterized in that used metal magnetic is one or more the powder mix in Fe powder, Fe-Si-Al powder, Fe-Ni-Mo powder, Fe-Ni powder, the Fe-Cu-Nb-Si-B powder, the powder mix of one or more in ferrite powder and the above-mentioned powder, various permanent magnetic alloy powders, the powder mix of one or more in permanent magnetic alloy powder and the above-mentioned powder.
14, the method for preparing soft magnetic metal powder core according to claim 11, it is characterized in that when carrying out metal magnetic surface passivation processing, it is 6～16 grams that every kilogram of metal powder adds dichromate or dichromate and the mixed amount of phosphoric acid salt, metal magnetic is added in the treatment solution, and be heated to 80～100 ℃, rinsing and oven dry then makes the metal magnetic surface form the anodized insulation layer.
15, the method for preparing soft magnetic metal powder core according to claim 11, it is characterized in that when carrying out metal magnetic surface passivation processing, it is 8～12 grams that every kilogram of metal powder adds dichromate or dichromate and the mixed amount of phosphoric acid salt, metal magnetic is added in the treatment solution, and be heated to 80～100 ℃, rinsing and oven dry then makes the metal magnetic surface form the anodized insulation layer.
16, the method for preparing soft magnetic metal powder core according to claim 11, it is characterized in that every kilogram of metal magnetic, add inorganic insulation caking agent 10～50ml, every kilogram of metal magnetic adds lubricant 6～10 grams, fully dries being lower than under 120 ℃ the temperature behind the mixing.
17, the method for preparing soft magnetic metal powder core according to claim 11 is characterized in that described compression moulding is meant static compacting, dynamic a kind of in compacting or the hot pressing, and the dwell time was greater than 5 seconds in the compacting.
18, the method for preparing soft magnetic metal powder core according to claim 11 is characterized in that the magnetic core of compression moulding is carried out sintering thermal treatment 350～700 ℃ of treatment temps, 0.5～4 hour treatment time, furnace cooling then.
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| CN104028747A (en) * | 2014-05-28 | 2014-09-10 | 浙江大学 | Inhomogeneous nucleation insulation coating processing method of metal soft magnetic composite material |
| CN104070161A (en) * | 2014-05-28 | 2014-10-01 | 浙江大学 | Preparation method for inorganic-organic composite adhesive-coated soft magnetic composite |
| CN104028747B (en) * | 2014-05-28 | 2015-05-27 | 浙江大学 | Inhomogeneous nucleation insulation coating processing method of metal soft magnetic composite material |
| CN104070161B (en) * | 2014-05-28 | 2015-10-28 | 浙江大学 | The preparation method of the coated soft-magnetic composite material of a kind of inorganic-organic hybrid binding agent |
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| CN101089108A (en) | 2007-12-19 |
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