CN104759619A - Method for performing insulating treatment on metal magnetic powder and preparing metal magnetic powder - Google Patents
Method for performing insulating treatment on metal magnetic powder and preparing metal magnetic powder Download PDFInfo
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- CN104759619A CN104759619A CN201510023203.7A CN201510023203A CN104759619A CN 104759619 A CN104759619 A CN 104759619A CN 201510023203 A CN201510023203 A CN 201510023203A CN 104759619 A CN104759619 A CN 104759619A
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Abstract
The invention discloses a method for performing insulating treatment on metal magnetic powder and preparing metal magnetic powder. The method comprises the following steps: reacting phosphoric acid and boric acid on the surface of metal magnetic powder, generating and absorbing a layer of phosphate and borate on the surface of the metal magnetic powder to obtain required B and P diffusion sources; under a vacuum atmosphere, performing diffusion reaction, diffusing B and P elements on the surface of the metal magnetic powder to inner part of the metal, and forming a metal gap compound containing B or P below a metal magnetic powder phosphate and borate coating layer after penetrating B and P on the surface of the metal magnetic powder. The metal gap compound and the boric acid left outside the magnetic powder have low melting point, are changed to be liquid at a high temperature to achieve the effects of an inorganic binder. The method has the beneficial effects of improving the insulation of the metal magnetic powder surface, and improving the resistance of the metal magnetic powder particles and the contact resistance of the magnetic powder; inorganic binding coater is adopted to directly form, so that the cost is reduced, the magnetic core strength is improved, and the atmospheric pollution is avoided.
Description
Technical field
The present invention relates to metal soft magnetic material and manufacture correlative technology field, refer in particular to a kind of metal magnetic insulation processing and prepare the method for metal magnetic powder core.
Background technology
Soft magnetic metal is a kind of material with high saturated magnetic induction, can reduce device volume, but shortcoming is that its resistivity is lower, is not suitable for high frequency and uses.Metal magnetic powder core is to overcome the low shortcoming of metal soft magnetic material resistivity, first soft magnetic metal being prepared into powder, then improve resistivity by the mode of powdered insulation process, then obtains required soft magnetism magnet by compressing and subsequent heat treatment.Because metal magnetic granularity is little, and surface coated one deck megohmite insulant again, hinder the eddy current effect between magnetic, thus eddy-current loss is low, is applicable to frequency applications.In addition, metal magnetic powder core is owing to having higher magnetic induction intensity, and comparatively low-coercivity and temperature stability, metal magnetic powder core by as inductance component, is widely used in the fields such as Switching Power Supply, telecommunications, radar.
The mode of metal magnetic insulation processing has multiple, and after its magnetic insulation processing, the magnetic core performance difference be prepared from is also larger.Chinese patent CN101089108 has invented a kind of metal soft magnetic powder core inorganic insulation binding agent and preparation method, and this inorganic insulation binding agent is by SiO
2, Al
2o
3, ZrO
2, mica powder and water mixes, the magnetic property of the method favourable raising powder core, plays certain positive role to the mechanical strength improving powder core, and solves during powder core uses and cause that powder core is aging, the problem of hydraulic performance decline because of heating, but also come with some shortcomings, because SiO wherein
2, Al
2o
3, ZrO
2, mica powder and water compounding substances, adhesion strength is not high, and be just attached to magnetic surface in the mode of physical surface adsorptions, it is combined loosely with magnetic.Magnetic is in batch mixing and shaping pressing process, and the inorganic substances on its surface easily come off, and causes insulating wrapped uneven, and resistivity declines, and causes magnetic core eddy-current loss to rise.Therefore the preparation method of this patent exists coated uneven, and magnetic insulant such as easily to come off at the defect.Chinese patent CN103594219A adopts the method for phosphoric acid surface passivation to carry out insulation processing on magnetic surface, preparation is simple and improve magnetic property for it, but adopt the method for phosphoric acid surface passivation, the phosphate non-refractory of Surface Creation, more than 600 degree can be decomposed, the insulating properties of magnetic can reduce, and core loss raises; On the other hand, this patent have employed organic binder bond, can cause the problem that magnetic core is aging.
Summary of the invention
There is above-mentioned deficiency to overcome in prior art in the present invention, provides a kind ofly improve the metal magnetic insulation processing of the surface insulated and metal magnetic resistivity of metal magnetic and prepare the method for metal magnetic powder core.
To achieve these goals, the present invention is by the following technical solutions:
Metal magnetic insulation processing and prepare the method for metal magnetic powder core, concrete operation step is as follows:
(1) passivating solution prepares: phosphoric acid, boric acid, water, acetone are prepared into mixed solution;
(2) metal magnetic Passivation Treatment: get the above-mentioned passivating solution prepared, add in the middle of metal magnetic, fully mix, make it even, metal magnetic Surface Creation phosphate and boric acid salt deposit, be easy to metal magnetic and passivating solution reacts, in magnetic surface uniform film forming;
(3) magnetic surface B, P element diffusion reaction: by the magnetic after passivation, shift in ZrO
2in box, under vacuum atmosphere protection, the uniform temperature that is rapidly heated also, after held for some time, cools with stove;
(4) vibration screening;
(5) compressing: toward in the magnetic after sieving, to add lubricant and releasing agent, stir, shaping in the die cavity being placed in press, obtained required blank;
(6) magnetic core heat treatment: blank is placed in stove and heat-treats, under adopting N2 protection or vacuum environment, with stove cooling, obtains required magnet;
(7) surface lacquer: adopt epoxy resin coating to spray magnet surface, obtained required magnetic core.
Adopt phosphoric acid and boric acid and metal magnetic surface reaction, adsorb one deck phosphate and boric acid salt deposit, B, P diffuse source needed for obtaining at metal magnetic Surface Creation; Then under vacuum atmosphere, carry out diffusion reaction, B, the P element on metal magnetic surface spread to metal inside, after B, P are oozed in metal magnetic surface, the metal gap compound containing B or P is formed below metal magnetic phosphate and borate clad, this layer of metal gap compound, internal electron travel motion will be fettered, and resistivity is improved; Inorganic salt deposit after the decomposition on metal magnetic surface in addition also will continue the effect playing insulation, and the inorganic salts of phosphoric acid therefore compared with simple is coated, and metal magnetic resistivity will be higher.In addition, the boric acid of remaining magnetic outside, because it has the feature of low melting point, will play liquefy under high temperature, play inorganic binder effect.The metal magnetic powder core prepared after adopting this insulating treatment method has the advantages that loss is lower, magnetic core intensity is higher, and owing to not adopting organic binder bond, magnetic core cost is low, without heat ageing, and the plurality of advantages such as heat treatment process is binder removal not, economic environmental protection.
As preferably, in step (1), first boric acid and water form boric acid aqueous solution, it is 1: 1 that its ratio controls, be 2: X: Y be made into mixed solution more in mass ratio by boric acid aqueous solution, phosphoric acid, acetone ratio, wherein X is any numeral of 1-5, and Y is any numeral of 5-20.
As preferably, in step (2), the weight ratio of passivating solution and metal magnetic is between 1: 8-1: 12.
As preferably, in step (3), under vacuum atmosphere protection, be rapidly heated between 600-800 degree, temperature retention time is 1-24 hour.B, P inorganic layer on metal magnetic surface will to magnetic diffusion inside, and the inorganic salt deposit of metal magnetic by forming B, the P element diffusion layer of high resistivity, has fettered metal surface electron transfer below, plays the effect improving resistivity.
As preferably, in step (4), after vibration screening, choose-100 order metal magnetics.Due to when Elements Diffusion, have employed the high temperature of more than 600 degree, the B that boric acid wherein resolves into
2o
3, solidify after melting, cause the adhesion of part metals magnetic, therefore need to carry out vibration screening, choose-100 order metal magnetics.
As preferably, in step (5), briquetting pressure is 800MPa-2200MPa, and the dwell time is 2-20s.
As preferably, in step (6), heat treatment temperature is 450-780 degree, and heat treatment time is 0.5-5 hour.
As preferably, in step (7), after surface lacquer, between 120-160 degree, solidify enamelled coating, hardening time is 20-30 minute.
As preferably, described metal magnetic is one or more in iron powder, iron silica flour, iron tantnickel powder, iron nickel powder, iron nickel molybdenum powder, iron aluminum silicon powder.
The invention has the beneficial effects as follows: the insulating properties that can improve metal magnetic surface, improve the contact resistance between the resistivity of metal magnetic particle itself and magnetic, reduction eddy-current loss is played to the metal magnetic powder core of follow-up preparation, further increases metal magnetic powder core frequency of utilization; Adopt inorganic bond covering straight forming, do not need to adopt organic binder bond to improve mouldability, effectively can reduce costs, and improve magnetic core intensity, not decompose organic binder bond in heat treatment process, without atmosphere pollution.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention will be further described.
Embodiment 1:
Phosphoric acid, boric acid, water, acetone are prepared into mixed solution, and first boric acid and water form boric acid aqueous solution, and it is 1: 1 that its ratio controls, then are be made into mixed solution at 2: 1: 20 in mass ratio by boric acid aqueous solution, phosphoric acid, acetone ratio.Get the passivating solution prepared, add in the middle of iron powder, the weight ratio of passivating solution and iron powder is 1: 8, fully mixes, and make it even, iron powder Surface Creation phosphate and boric acid salt deposit become diffuse source.By the iron powder after surface passivation, shift in ZrO
2in box, under vacuum atmosphere protection, be rapidly heated to 600 degree, temperature retention time is 1 hour, cools with stove.B, P inorganic layer on metal magnetic surface will to metal magnetic diffusion inside, and iron powder surface inorganic salt deposit by forming B, the P element diffusion layer of high resistivity, has fettered metal surface electron transfer below, plays the effect improving resistivity.Due to when Elements Diffusion, have employed 600 degree and above high temperature, the B that boric acid wherein resolves into
2o
3, solidify after melting, cause the adhesion of part iron powder, therefore need vibration screening, sieve and choose-100 order iron powders.Add lubricant and releasing agent toward iron powder, stir, shaping in the die cavity being placed in press, be molded into the magnet ring of 27mm × 14.6mm × 11.2mm, briquetting pressure is 800MPa, and the dwell time is 2s, obtained required blank.Blank is placed in N
2heat-treat in protection or vacuum furnace, heat treatment temperature is 450 degree, and heat treatment time is 5 hours, with stove cooling, obtains required magnet.Adopt epoxy resin coating to spray magnet surface, then 120 degree of solidifications, hardening time is 30 minutes, obtained required magnetic core.
Embodiment 2:
Phosphoric acid, boric acid, water, acetone are prepared into mixed solution, and first boric acid and water form boric acid aqueous solution, and it is 1: 1 that its ratio controls, then are be made into mixed solution at 2: 2: 5 in mass ratio by boric acid aqueous solution, phosphoric acid, acetone ratio.Get the passivating solution prepared, add in the middle of iron silica flour, the weight ratio of passivating solution and iron silica flour is 1: 12, fully mixes, and make it even, be easy at iron silicon powder surface homogeneous film formation, iron silicon powder surface generates phosphate and boric acid salt deposit becomes diffuse source.By the iron silica flour after surface passivation, shift in ZrO
2in box, under vacuum atmosphere protection, be rapidly heated to 800 degree, temperature retention time is 24 hours, and stove is cold.B, P inorganic layer on metal magnetic surface will to metal magnetic diffusion inside, and the inorganic salt deposit of iron silicon powder surface by forming B, the P element diffusion layer of high resistivity, has fettered metal surface electron transfer below, plays the effect improving resistivity.Due to when Elements Diffusion, have employed the high temperature of more than 600 degree, the B that boric acid wherein resolves into
2o
3, solidify after melting, cause the adhesion of part iron silica flour, therefore need vibration screening, sieve and choose-100 order iron silica flours.Add lubricant and releasing agent toward iron silica flour, stir, shaping in the die cavity being placed in press, be molded into the magnet ring of 27mm × 14.6mm × 11.2mm, briquetting pressure is 2000MPa, and the dwell time is 10s, obtained required blank.Blank is placed in N
2heat-treat in protection or vacuum furnace, heat treatment temperature is 750 degree, and heat treatment time is 1 hour, with stove cooling, obtains required magnet.Adopt epoxy resin coating to spray magnet surface, then 160 degree of solidifications, hardening time is 20 minutes, obtained required magnetic core.
Embodiment 3:
Phosphoric acid, boric acid, water, acetone are prepared into mixed solution, and first boric acid and water form boric acid aqueous solution, and it is 1: 1 that its ratio controls, then are be made into mixed solution at 2: 3: 10 in mass ratio by boric acid aqueous solution, phosphoric acid, acetone ratio.Get the passivating solution prepared, add in the middle of iron tantnickel powder, the weight ratio of passivating solution and iron tantnickel powder is 1: 9, fully mixes, and make it even, be easy in iron tantnickel powder surface uniform film forming, iron tantnickel powder Surface Creation phosphate and boric acid salt deposit become diffuse source.By the iron tantnickel powder after surface passivation, shift in ZrO
2in box, under vacuum atmosphere protection, be rapidly heated to 700 degree, temperature retention time is 3 hours, and stove is cold.B, P inorganic layer on metal magnetic surface will to metal magnetic diffusion inside, and iron tantnickel powder surface inorganic salt deposit by forming B, the P element diffusion layer of high resistivity, has fettered metal surface electron transfer below, plays the effect improving resistivity.Due to when Elements Diffusion, have employed the high temperature of more than 600 degree, the B that boric acid wherein resolves into
2o
3, solidify after melting, cause the adhesion of part iron tantnickel powder, therefore need vibration screening, sieve and choose-100 order iron powders.Add lubricant and releasing agent toward iron powder, stir, shaping in the die cavity being placed in press, be molded into the magnet ring of 27mm × 14.6mm × 11.2mm, briquetting pressure is 2200MPa, and the dwell time is 20s, obtained required blank.Blank is placed in N
2heat-treat in protection or vacuum furnace, heat treatment temperature is 780 degree, and heat treatment time is 0.5 hour, with stove cooling, obtains required magnet.Adopt epoxy resin coating to spray magnet surface, then 160 degree of solidifications, hardening time is 20 minutes, obtained required magnetic core.
Embodiment 4:
Phosphoric acid, boric acid, water, acetone are prepared into mixed solution, and first boric acid and water form boric acid aqueous solution, and it is 1: 1 that its ratio controls, then are be made into mixed solution at 2: 3: 15 in mass ratio by boric acid aqueous solution, phosphoric acid, acetone ratio.Get the passivating solution prepared, add in the middle of iron nickel powder, the weight ratio of passivating solution and iron nickel powder is 1: 10, fully mixes, and make it even, be easy in iron nickel powder surface uniform film forming, iron nickel powder Surface Creation phosphate and boric acid salt deposit become diffuse source.By the iron nickel powder after surface passivation, shift in ZrO
2in box, under vacuum atmosphere protection, be rapidly heated to 720 degree, temperature retention time is 3 hours, and stove is cold.B, P inorganic layer on metal magnetic surface will to metal magnetic diffusion inside, and iron nickel powder surface inorganic salt deposit by forming B, the P element diffusion layer of high resistivity, has fettered metal surface electron transfer below, plays the effect improving resistivity.Due to when Elements Diffusion, have employed the high temperature of more than 600 degree, the B that boric acid wherein resolves into
2o
3, solidify after melting, cause the adhesion of part iron nickel powder, therefore need vibration screening, sieve and choose-100 order iron powders.Add lubricant and releasing agent toward iron powder, stir, shaping in the die cavity being placed in press, be molded into the magnet ring of 27mm × 14.6mm × 11.2mm, briquetting pressure is 2200MPa, and the dwell time is 10s, obtained required blank.Blank is placed in N
2heat-treat in protection or vacuum furnace, heat treatment temperature is 700 degree, and heat treatment time is 0.5 hour, with stove cooling, obtains required magnet.Adopt epoxy resin coating to spray magnet surface, then 130 degree of solidifications, hardening time is 25 minutes, obtained required magnetic core.
Embodiment 5:
Phosphoric acid, boric acid, water, acetone are prepared into mixed solution, and first boric acid and water form boric acid aqueous solution, and it is 1: 1 that its ratio controls, then are be made into mixed solution at 2: 1: 12 in mass ratio by boric acid aqueous solution, phosphoric acid, acetone ratio.Get the passivating solution prepared, add in the middle of iron nickel molybdenum powder, the weight ratio of passivating solution and iron nickel molybdenum powder is 1: 10, fully mixes, and make it even, be easy in iron nickel molybdenum powder surface uniform film forming, iron nickel molybdenum powder Surface Creation phosphate and boric acid salt deposit become diffuse source.By the iron nickel molybdenum powder after surface passivation, shift in ZrO
2in box, under vacuum atmosphere protection, be rapidly heated to 600 degree, temperature retention time is 5 hours, and stove is cold.B, P inorganic layer on metal magnetic surface will to metal magnetic diffusion inside, and iron nickel molybdenum powder surface inorganic salt deposit by forming B, the P element diffusion layer of high resistivity, has fettered metal surface electron transfer below, plays the effect improving resistivity.Due to when Elements Diffusion, have employed 600 degree and above high temperature, the B that boric acid wherein resolves into
2o
3, solidify after melting, cause the adhesion of part iron nickel molybdenum powder, therefore need vibration screening, sieve and choose-100 order iron powders.Add lubricant and releasing agent toward iron powder, stir, shaping in the die cavity being placed in press, be molded into the magnet ring of 27mm × 14.6mm × 11.2mm, briquetting pressure is 2200MPa, and the dwell time is 20s, obtained required blank.Blank is placed in N
2heat-treat in protection or vacuum furnace, heat treatment temperature is 590 degree, and heat treatment time is 1 hour, with stove cooling, obtains required magnet.Adopt epoxy resin coating to spray magnet surface, then 135 degree of solidifications, hardening time is 25 minutes, obtained required magnetic core.
Embodiment 6:
Phosphoric acid, boric acid, water, acetone are prepared into mixed solution, and first boric acid and water form boric acid aqueous solution, and it is 1: 1 that its ratio controls, then are be made into mixed solution at 2: 4: 18 in mass ratio by boric acid aqueous solution, phosphoric acid, acetone ratio.Get the passivating solution prepared, add in the middle of iron aluminum silicon powder, the weight ratio of passivating solution and iron aluminum silicon powder is 1: 11, fully mixes, and make it even, be easy in iron aluminum silicon powder surface uniform film forming, iron aluminum silicon powder Surface Creation phosphate and boric acid salt deposit become diffuse source.By the iron aluminum silicon powder after surface passivation, shift in ZrO
2in box, under vacuum atmosphere protection, be rapidly heated to 650 degree, temperature retention time is 8 hours, and stove is cold.B, P inorganic layer on metal magnetic surface will to metal magnetic diffusion inside, and iron aluminum silicon powder surface inorganic salt deposit by forming B, the P element diffusion layer of high resistivity, has fettered metal surface electron transfer below, plays the effect improving resistivity.Due to when Elements Diffusion, have employed the high temperature of more than 600 degree, the B that boric acid wherein resolves into
2o
3, solidify after melting, cause the adhesion of part iron aluminum silicon powder, therefore need vibration screening, sieve and choose-100 order iron powders.Add lubricant and releasing agent toward iron powder, stir, shaping in the die cavity being placed in press, be molded into the magnet ring of 27mm × 14.6mm × 11.2mm, briquetting pressure is 2000MPa, and the dwell time is 10s, obtained required blank.Blank is placed in N
2heat-treat in protection or vacuum furnace, heat treatment temperature is 680 degree, and heat treatment time is 3 hours, with stove cooling, obtains required magnet.Adopt epoxy resin coating to spray magnet surface, then 145 degree of solidifications, hardening time is 22 minutes, obtained required magnetic core.
Claims (9)
1. metal magnetic insulation processing and prepare the method for metal magnetic powder core, it is characterized in that, concrete operation step is as follows:
(1) passivating solution prepares: phosphoric acid, boric acid, water, acetone are prepared into mixed solution;
(2) metal magnetic Passivation Treatment: get the above-mentioned passivating solution prepared, add in the middle of metal magnetic, fully mix, make it even, metal magnetic Surface Creation phosphate and boric acid salt deposit, be easy to metal magnetic and passivating solution reacts, in magnetic surface uniform film forming;
(3) magnetic surface B, P element diffusion reaction: by the magnetic after passivation, shift in ZrO
2in box, under vacuum atmosphere protection, the uniform temperature that is rapidly heated also, after held for some time, cools with stove;
(4) vibration screening;
(5) compressing: toward in the magnetic after sieving, to add lubricant and releasing agent, stir, shaping in the die cavity being placed in press, obtained required blank;
(6) magnetic core heat treatment: blank is placed in stove and heat-treats, adopts N
2protect or under vacuum environment, with stove cooling, obtain required magnet;
(7) surface lacquer: adopt epoxy resin coating to spray magnet surface, obtained required magnetic core.
2. a kind of metal magnetic insulation processing according to claim 1 and prepare the method for metal magnetic powder core, it is characterized in that, in step (1), first boric acid and water form boric acid aqueous solution, it is 1: 1 that its ratio controls, be 2: X: Y be made into mixed solution more in mass ratio by boric acid aqueous solution, phosphoric acid, acetone ratio, wherein X is any numeral of 1-5, and Y is any numeral of 5-20.
3. a kind of metal magnetic insulation processing according to claim 1 and prepare the method for metal magnetic powder core, it is characterized in that, in step (2), the weight ratio of passivating solution and metal magnetic is between 1: 8-1: 12.
4. a kind of metal magnetic insulation processing according to claim 1 and prepare the method for metal magnetic powder core, it is characterized in that, in step (3), under vacuum atmosphere protection, be rapidly heated between 600-800 degree, temperature retention time is 1-24 hour.
5. a kind of metal magnetic insulation processing according to claim 1 and prepare the method for metal magnetic powder core, is characterized in that, in step (4), after vibration screening, choose-100 order metal magnetics.
6. a kind of metal magnetic insulation processing according to claim 1 and prepare the method for metal magnetic powder core, it is characterized in that, in step (5), briquetting pressure is 800MPa-2200MPa, and the dwell time is 2-20s.
7. a kind of metal magnetic insulation processing according to claim 1 and prepare the method for metal magnetic powder core, it is characterized in that, in step (6), heat treatment temperature is 450-780 degree, and heat treatment time is 0.5-5 hour.
8. a kind of metal magnetic insulation processing according to claim 1 and prepare the method for metal magnetic powder core, it is characterized in that, in step (7), after surface lacquer, between 120-160 degree, solidify enamelled coating, hardening time is 20-30 minute.
9. a kind of metal magnetic insulation processing according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 and prepare the method for metal magnetic powder core, it is characterized in that, described metal magnetic is one or more in iron powder, iron silica flour, iron tantnickel powder, iron nickel powder, iron nickel molybdenum powder, iron aluminum silicon powder.
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| CN106205928A (en) * | 2016-06-29 | 2016-12-07 | 无锡康柏斯机械科技有限公司 | A kind of soft magnet core based on automobile ignition coil |
| CN106340367A (en) * | 2016-08-10 | 2017-01-18 | 横店集团东磁股份有限公司 | Preparation process of ferrite and neodymium iron boron (NdFeB) composite bonded magnet |
| CN107464651A (en) * | 2016-06-29 | 2017-12-12 | 南安市达腾商务服务有限公司 | A kind of preparation technology of pen-type ignition coil of automobile iron core |
| CN107578874A (en) * | 2017-09-14 | 2018-01-12 | 横店集团东磁股份有限公司 | A kind of preparation method of the iron nickel powder core of magnetic permeability μ=200 |
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| CN107464651B (en) * | 2016-06-29 | 2019-05-10 | 浙江辉波蕾汽车部件有限公司 | A kind of preparation process of pen-type ignition coil of automobile iron core |
| CN106340367A (en) * | 2016-08-10 | 2017-01-18 | 横店集团东磁股份有限公司 | Preparation process of ferrite and neodymium iron boron (NdFeB) composite bonded magnet |
| CN107578874B (en) * | 2017-09-14 | 2019-04-05 | 横店集团东磁股份有限公司 | A kind of preparation method of the iron nickel powder core of magnetic permeability μ=200 |
| CN107578874A (en) * | 2017-09-14 | 2018-01-12 | 横店集团东磁股份有限公司 | A kind of preparation method of the iron nickel powder core of magnetic permeability μ=200 |
| CN107578875A (en) * | 2017-10-17 | 2018-01-12 | 德清森腾电子科技有限公司 | A kind of manufacturing process of sendust soft-magnetic composite material |
| CN107578875B (en) * | 2017-10-17 | 2020-05-12 | 德清森腾电子科技有限公司 | Manufacturing process of iron-silicon-aluminum alloy soft magnetic composite material |
| CN108461247A (en) * | 2018-04-27 | 2018-08-28 | 合肥博微田村电气有限公司 | A kind of method that inorganic insulation cladding prepares soft magnetic metal powder |
| CN109680210A (en) * | 2018-12-18 | 2019-04-26 | 横店集团东磁股份有限公司 | A kind of preparation method of μ=150~250 iron-silicon-aluminum soft magnet powder cores |
| CN109680210B (en) * | 2018-12-18 | 2020-03-20 | 横店集团东磁股份有限公司 | Preparation method of mu = 150-250 sendust soft magnetic powder core |
| CN113380488A (en) * | 2021-06-08 | 2021-09-10 | 马鞍山新康达磁业有限公司 | Insulated coated metal magnetic powder, preparation method and metal magnetic powder core |
| CN113380488B (en) * | 2021-06-08 | 2024-09-10 | 马鞍山新康达磁业股份有限公司 | Insulating coated metal magnetic powder, preparation method and metal magnetic powder core |
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