CN104103413A - Method for preparing magnetic powder core with high-flux magnet ring performance - Google Patents
Method for preparing magnetic powder core with high-flux magnet ring performance Download PDFInfo
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- CN104103413A CN104103413A CN201410287682.9A CN201410287682A CN104103413A CN 104103413 A CN104103413 A CN 104103413A CN 201410287682 A CN201410287682 A CN 201410287682A CN 104103413 A CN104103413 A CN 104103413A
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Abstract
The invention discloses a method for preparing a magnetic powder core with high-flux magnet ring performance. The method comprises the following steps of alloy smelting, gas atomization crushing, annealing, insulation coating, compression molding, heat treatment, reinforcing and surface paint spraying. The magnetic powder core prepared by the method has high-saturation magnetic induction intensity, high alternating current/direct current superposition property and good temperature stability, is low in iron core loss and cost, meets the requirements of high frequency, high power, miniaturization and electromagnetic interference resistance of electron devices, and is greatly noticed by the electron industry, and the market application scope is enlarged continuously.
Description
Technical field
The present invention relates to magnetic core preparing technical field, relate in particular to a kind of preparation method with the powder core of high magnetic flux magnet ring performance.
Background technology
Powder core is by ferromagnetism powder, to be mixed a kind of soft magnetic material that compacting forms with dielectric.Due to ferromagnetic particle very little (what use under high frequency is 0.5～5 micron), by non magnetic electrical insulating film material, separated again, therefore, can completely cut off eddy current on the one hand, material is applicable to upper frequency; Due to the channel effect between particle, cause material to there is low permeability and permanent permeance on the other hand; Because particle size is little, substantially do not collect skin phenomenon again, magnetic permeability is also just comparatively stable with the variation of frequency.Be mainly used in high-frequency inductor.The magnetic electricity performance of powder core depends primarily on the permeability of powder material, the size and shape of powder, their activity coefficient, content, briquetting pressure and the Technology for Heating Processing etc. of dielectric.Conventional powder core has three kinds of ferrocart core, permalloy powder core and iron Si-Al Magnetic Powder Core.
The development of science and technology, particularly emphasizes energy-saving and emission-reduction in recent years, reduces environmental pollution, saves precious resource, very large to the promotion of electronics, electrical apparatus industry.Solar power generation, wind power generation, high-power illumination power supply, electronic Large Electric quick automobile charger and industrial control equipment, all relate to Switching Power Supply, wherein there are frequency translation, energy storage line filter, power factor corrector, anti-electromagnetic interference etc. all will apply inductance, and must use iron core to improve inductance value and good magnetic property.The frequency of tens of hertz is to widely apply silicon steel sheet to manufacture the iron core of transformer motor, electrical equipment etc., number megahertz is made inductor core to tens of megahertz application soft magnetic ferrites, tens of KHz will be used metal magnetic powder core to hundreds of KHz, in metal magnetic powder core, widely apply the straight iron powder core that price is low, but core loss is large, magnetic permeability is about 75.Iron nickel in alloy magnetic powder core, iron nickel molybdenum powder core price are higher.
Summary of the invention
The invention provides a kind of preparation method with the powder core of high magnetic flux magnet ring performance.A large amount of exhaustive exploitations along with the mankind, the allowable exploitation of metallic nickel is fewer and feweri, have to find out the problem that replaces the minimizing of nickel with other metal, the present invention develops a kind of nickel that do not use, but the magnetic property after compressing reaches high magnetic flux magnet ring performance, in the situation that not affecting performance, both saved cost, saved again the use of rare metal.
The present invention adopts following technical scheme:
The preparation method's of the powder core with high magnetic flux magnet ring performance of the present invention concrete steps are as follows:
(1) ferro-silicium being put into vaccum sensitive stove smelts; in ferro-silicium, silicone content is 5-8%; surplus is iron; then at 750 ℃, ferro-silicium is burnt till to solution; solution is carried out solution to utilize high pressure nitrogen broken in the container of high 8-12 rice; under nitrogen protection, drop into again 720 degree in heat-treatment furnace and carry out annealing in process; heat treated object is to remove because of broken particle and the intergranular stress of producing; heat treatment divides again preheating section and high temperature section and three steps of cooling section; be cooled to after room temperature, gained powder is crossed to 180-400 mesh sieve.
(2) powder of step (1) gained is carried out after the surperficial water with 2-3% phosphoric acid and 4-5% stirs putting into stirred vessel, then heating, drying, temperature is at 90-110 degree, after bone dry after cooling can, this kind of way must strictly be controlled temperature and time.Then in powder, add insulating compound, in-lubricant and release agent, carry out again compression molding, the pressure of mold pressing is 18T/ ㎝ * 2, then heat-treat also minute preheating zone and high-temperature region and San Ge region, cooling zone, first product is in 450 degree temperature section preheatings, and preheating, after 30 minutes, then enters 730 degree temperature high-temperature heatings, heat and enter cooling section after 60 minutes, after cooling 30 minutes, product takes out.Consolidation process: product is put into containing immersion liquid and soaked 25 minutes, then taking-up can after putting into baking oven 220 degree oven dry after cleaning up.Finally, at surface spraying epoxy resin paint, make powder core of the present invention.
In step (1), in ferro-silicium, silicone content is preferably 6.5%, and surplus is iron.
In step (2), described described insulating compound Shi Gao Age soil, the addition of insulating compound is the 0.2-0.25% of alloy powder weight.
In step (2), described in-lubricant is molybdenum bisuphide, and the addition of in-lubricant is the 0.2-0.3% of alloy powder weight.
In step (2), described release agent is zinc stearate, and the addition of release agent is the 0.3-0.6% of alloy powder weight.
In step (2), compression molding is that external diameter Φ 26.92mm, internal diameter Φ 14.70mm, height are the annular sample of 11.18mm.
In step (2), automatic dry chemical forming hydraulic press is used in compression molding.
In step (2), described epoxy resin paint is the modified form epoxy resin paint of resistance to 200 ℃.
In step (2), in consolidation process, described is silicone resin containing immersion liquid.
Good effect of the present invention is as follows:
The powder core with high magnetic flux magnet ring performance prepared by the present invention has the following advantages: high saturation (1.5T), core loss is lower than ferrocart core and silicon steel, and cost is lower than molybdenum permalloy material, splendid direct current biasing, Curie temperature is high, stable temperature performance and the design of applicable small size.
Powder core prepared by the present invention has high saturated magnetic induction, high alternating current-direct current superimposed characteristics and good temperature stability, low core loss, low cost, be applicable to the requirement of the high frequency of electronic device, high-power, miniaturization and anti-electromagnetic interference, market range of application constantly expands, and is subject to electron trade and pays close attention to greatly.
Embodiment
The following examples are to describe in further detail of the present invention.
Embodiment 1
(1) ferro-silicium being put into vaccum sensitive stove smelts, in ferro-silicium, silicone content is 5%, surplus is iron, then at 750 ℃, ferro-silicium is burnt till to solution, in the container of high 8m, utilize high pressure nitrogen broken solution, under nitrogen protection, drop into again in heat-treatment furnace 720 ℃ and carry out annealing in process, be cooled to after room temperature, gained powder is crossed to 180 mesh sieves;
(2) powder of step (1) gained is carried out to surface passivation, after stirring with the water of 2wt% phosphoric acid and 4wt%, put into stirred vessel, then heating, drying, 90 ℃ of temperature, after bone dry, in powder, add insulating compound, in-lubricant and release agent, then carry out compression molding, the pressure of mold pressing is 18T/cm
2, then to heat-treat, heat treatment divides preheating zone and high-temperature region and San Ge region, cooling zone, first product is 450 ℃ of temperature section preheatings, after preheating 30min, then enter 730 ℃ of temperature high-temperature heatings, after heating 60min, enter cooling section, after cooling 30min, product takes out, carry out consolidation process, product is put into containing immersion liquid and is soaked 25min again, and then taking-up is put into 220 ℃ of oven dry of baking oven after cleaning up, finally, at surface spraying epoxy resin paint, make powder core of the present invention.
In step (2), described insulating compound Shi Gao Age soil, the addition of insulating compound is 0.2% of alloy powder weight.Described in-lubricant is molybdenum bisuphide, and the addition of in-lubricant is 0.2% of alloy powder weight.Described release agent is zinc stearate, and the addition of release agent is 0.3% of alloy powder weight.
In step (2), compression molding is that external diameter Φ 26.92mm, internal diameter Φ 14.70mm, height are the annular sample of 11.18mm.
In step (2), automatic dry chemical forming hydraulic press is used in compression molding.
In step (2), described epoxy resin paint is the modified form epoxy resin paint of resistance to 200 ℃.
In step (2), in consolidation process, described is silicone resin containing immersion liquid.
Embodiment 2
(1) ferro-silicium being put into vaccum sensitive stove smelts, in ferro-silicium, silicone content is 8%, surplus is iron, then at 750 ℃, ferro-silicium is burnt till to solution, in the container of high 12m, utilize high pressure nitrogen broken solution, under nitrogen protection, drop into again in heat-treatment furnace 720 ℃ and carry out annealing in process, be cooled to after room temperature, gained powder is crossed to 400 mesh sieves;
(2) powder of step (1) gained is carried out to surface passivation, after stirring with the water of 3wt% phosphoric acid and 5wt%, put into stirred vessel, then heating, drying, 110 ℃ of temperature, after bone dry, in powder, add insulating compound, in-lubricant and release agent, then carry out compression molding, the pressure of mold pressing is 18T/cm
2, then to heat-treat, heat treatment divides preheating zone and high-temperature region and San Ge region, cooling zone, first product is 450 ℃ of temperature section preheatings, after preheating 30min, then enter 730 ℃ of temperature high-temperature heatings, after heating 60min, enter cooling section, after cooling 30min, product takes out, carry out consolidation process, product is put into containing immersion liquid and is soaked 25min again, and then taking-up is put into 220 ℃ of oven dry of baking oven after cleaning up, finally, at surface spraying epoxy resin paint, make powder core of the present invention.
In step (2), described insulating compound Shi Gao Age soil, the addition of insulating compound is 0.25% of alloy powder weight.Described in-lubricant is molybdenum bisuphide, and the addition of in-lubricant is 0.3% of alloy powder weight.Described release agent is zinc stearate, and the addition of release agent is 0.6% of alloy powder weight.
In step (2), compression molding is that external diameter Φ 26.92mm, internal diameter Φ 14.70mm, height are the annular sample of 11.18mm.
In step (2), automatic dry chemical forming hydraulic press is used in compression molding.
In step (2), described epoxy resin paint is the modified form epoxy resin paint of resistance to 200 ℃.
In step (2), in consolidation process, described is silicone resin containing immersion liquid.
Embodiment 3
(1) ferro-silicium being put into vaccum sensitive stove smelts, in ferro-silicium, silicone content is 6.5%, surplus is iron, then at 750 ℃, ferro-silicium is burnt till to solution, in the container of high 10m, utilize high pressure nitrogen broken solution, under nitrogen protection, drop into again in heat-treatment furnace 720 ℃ and carry out annealing in process, be cooled to after room temperature, gained powder is crossed to 200 mesh sieves;
(2) powder of step (1) gained is carried out to surface passivation, after stirring with the water of 2.5wt% phosphoric acid and 4.5wt%, put into stirred vessel, then heating, drying, 100 ℃ of temperature, after bone dry, in powder, add insulating compound, in-lubricant and release agent, then carry out compression molding, the pressure of mold pressing is 18T/cm
2, then to heat-treat, heat treatment divides preheating zone and high-temperature region and San Ge region, cooling zone, first product is 450 ℃ of temperature section preheatings, after preheating 30min, then enter 730 ℃ of temperature high-temperature heatings, after heating 60min, enter cooling section, after cooling 30min, product takes out, carry out consolidation process, product is put into containing immersion liquid and is soaked 25min again, and then taking-up is put into 220 ℃ of oven dry of baking oven after cleaning up, finally, at surface spraying epoxy resin paint, make powder core of the present invention.
In step (2), described insulating compound Shi Gao Age soil, the addition of insulating compound is 0.23% of alloy powder weight.Described in-lubricant is molybdenum bisuphide, and the addition of in-lubricant is 0.25% of alloy powder weight.Described release agent is zinc stearate, and the addition of release agent is 0.5% of alloy powder weight.
In step (2), compression molding is that external diameter Φ 26.92mm, internal diameter Φ 14.70mm, height are the annular sample of 11.18mm.
In step (2), automatic dry chemical forming hydraulic press is used in compression molding.
In step (2), described epoxy resin paint is the modified form epoxy resin paint of resistance to 200 ℃.
In step (2), in consolidation process, described is silicone resin containing immersion liquid.
The performance of powder core prepared by embodiment 4 the present invention
We carry out following performance measurement to the powder core of the embodiment of the present invention 3 preparations:
Inductance value L (μ H) with LCR digital electric bridge measurement sample under 10KHz～200KHz frequency and quality factor q value (reference), alternating current-direct current stack performance (AC=100KHz, DC Bias H=100Oe) core loss (50KHz 1000Gs), use the enamelled wire of wire diameter Φ 0.5mm around 25 circles.
The performance of the powder core of the embodiment of the present invention 3 preparations is as follows:
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is limited by claims and equivalent thereof.
Claims (9)
1. a preparation method with the powder core of high magnetic flux magnet ring performance, is characterized in that: the concrete steps of described method are as follows:
(1) ferro-silicium being put into vaccum sensitive stove smelts, in ferro-silicium, silicone content is 5-8%, surplus is iron, then at 750 ℃, ferro-silicium is burnt till to solution, in the container of high 8-12m, utilize high pressure nitrogen broken solution, under nitrogen protection, drop into again in heat-treatment furnace 720 ℃ and carry out annealing in process, be cooled to after room temperature, gained powder is crossed to 180-400 mesh sieve;
(2) powder of step (1) gained is carried out to surface passivation, after stirring with the water of 2-3wt% phosphoric acid and 4-5wt%, put into stirred vessel, then heating, drying, temperature 90-110 ℃, after bone dry, in powder, add insulating compound, in-lubricant and release agent, then carry out compression molding, the pressure of mold pressing is 18T/cm
2, then to heat-treat, heat treatment divides preheating zone and high-temperature region and San Ge region, cooling zone, first product is 450 ℃ of temperature section preheatings, after preheating 30min, then enter 730 ℃ of temperature high-temperature heatings, after heating 60min, enter cooling section, after cooling 30min, product takes out, carry out consolidation process, product is put into containing immersion liquid and is soaked 25min again, and then taking-up is put into 220 ℃ of oven dry of baking oven after cleaning up, finally, at surface spraying epoxy resin paint, make powder core of the present invention.
2. preparation method as claimed in claim 1, is characterized in that: in step (1), in ferro-silicium, silicone content is 6.5%, and surplus is iron.
3. preparation method as claimed in claim 1, is characterized in that: in step (2), described insulating compound Shi Gao Age is native, and the addition of insulating compound is the 0.2-0.25% of alloy powder weight.
4. preparation method as claimed in claim 1, is characterized in that: in step (2), described in-lubricant is molybdenum bisuphide, and the addition of in-lubricant is the 0.2-0.3% of alloy powder weight.
5. preparation method as claimed in claim 1, is characterized in that: in step (2), described release agent is zinc stearate, and the addition of release agent is the 0.3-0.6% of alloy powder weight.
6. preparation method as claimed in claim 1, is characterized in that: in step (2), compression molding is that external diameter Φ 26.92mm, internal diameter Φ 14.70 mm, height are the annular sample of 11.18 mm.
7. preparation method as claimed in claim 1, is characterized in that: in step (2), automatic dry chemical forming hydraulic press is used in compression molding.
8. preparation method as claimed in claim 1, is characterized in that: in step (2), described epoxy resin paint is the modified form epoxy resin paint of resistance to 200 ℃.
9. preparation method as claimed in claim 1, is characterized in that: in step (2), in consolidation process, described is silicone resin containing immersion liquid.
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Cited By (5)
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| CN105185560A (en) * | 2015-08-24 | 2015-12-23 | 北京康普锡威科技有限公司 | Preparation method of Fe-based metal soft magnetic powder core |
| CN105695704A (en) * | 2016-01-19 | 2016-06-22 | 兆晶股份有限公司 | Heat treatment method for transformer superparamagnetic iron core |
| CN106024346A (en) * | 2016-06-29 | 2016-10-12 | 无锡康柏斯机械科技有限公司 | Preparation process of pen-like iron core for automobile ignition coil |
| CN107578876A (en) * | 2017-10-17 | 2018-01-12 | 德清森腾电子科技有限公司 | A manufacturing process of iron-silicon alloy soft magnetic composite material |
| CN109065316A (en) * | 2018-08-08 | 2018-12-21 | 德清鑫晨粉末科技有限公司 | A kind of iron silicon magnetic core of high magnetic permeability and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109065316A (en) * | 2018-08-08 | 2018-12-21 | 德清鑫晨粉末科技有限公司 | A kind of iron silicon magnetic core of high magnetic permeability and preparation method thereof |
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