CN103693950A - Preparation method for soft-magnetic ferrite powder - Google Patents
Preparation method for soft-magnetic ferrite powder Download PDFInfo
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- CN103693950A CN103693950A CN201310607834.4A CN201310607834A CN103693950A CN 103693950 A CN103693950 A CN 103693950A CN 201310607834 A CN201310607834 A CN 201310607834A CN 103693950 A CN103693950 A CN 103693950A
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- magnetic ferrite
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Abstract
The invention provides a preparation method for soft-magnetic ferrite powder. A green body molded from the powder has the characteristic of high strength. A polyvinyl acetate emulsion (white emulsion) is used to fully or partially replace a polyvinyl alcohol (PVA) solution as an adhesive composition, special dispersant for a magnetic material, a glycerol plasticizer and a glycol antifoaming agent are added, and wet ball milling, spray drying and granulation are carried out so as to prepare the soft-magnetic ferrite powder.
Description
Technical field
The present invention relates to a kind of soft ferromagnetic powder preparation method, especially a kind of employing polyvinyl acetate emulsion (white glue with vinyl) replaces all or part of polyvinyl alcohol (PVA) solution to do glue paste, add magneticsubstance dispersant special, glycerol softening agent, ethylene glycol defoamer, adopt wet ball grinding, spray drying granulation to prepare soft ferromagnetic powder.
Background technology
Soft magnetic ferrite has the features such as high permeability, high resistivity, low-loss under high frequency effect, also there is ceramic wear resistance simultaneously, thereby be widely used in computer, communication, consumer electronics etc., play the effects such as power delivery, anti-electromagnetic interference, electromagnetic oscillation.Because electronic component is to miniaturization, surface mount future development, soft magnetic components size is more and more less, and accuracy requirement is more and more higher.In molding procedure, damaged for avoiding small size, special-shaped product green compact to occur, need powder molding blank to there is high physical strength, slurry technology of preparing is good and bad, directly affects the quality of the moulding product of spray-dried granules material.Therefore slurry, preparation are gordian techniquies prepared by ferrite, directly the quality product of road moulding after impact, sintering.
Existing soft magnetic ferrite slurry preparation mainly be take polyvinyl alcohol solution as tackiness agent, adopts roller ball mill or stirs sand milling grinding technics.Because needs boil peptization solution to polyvinyl alcohol, need artificial and energy consumption, polyvinyl acetate emulsion can save and boil glue process in contrast, addition is 1/5 left and right of PVA solution simultaneously, can reduce the addition of glue, improves material by solid content, at 150-190 ℃, Vinyl Acetate Copolymer decomposes generation acetic acid and hydrocarbonize platform thing, has reduced dump temperature, reduces product cracking phenomena.The more important thing is with the tackiness agent that polyvinyl acetate emulsion replaces PVA solution to do soft magnetism powder and can obviously improve green strength, solve the disrepair phenomenon that the moulding of small-sized, special-shaped magnetic core green compact easily occurs.
Summary of the invention
The object of the invention is to for the powder of preparing by existing soft magnetic ferrite slurry Technology, moulding green strength is low, easily damaged, PVA solution adhesive is not easy binder removal, product easily ftractures, cause qualification rate low, the deficiency that production cost is high, providing a kind of employing to take the white glue with vinyl that Vinyl Acetate Copolymer is main monomer replaces all or part of polyvinyl alcohol (PVA) solution to do glue paste, add glycerol softening agent, ethylene glycol defoamer, carry out slurrying, spray drying granulation, effectively improve the preparation method of soft magnetic ferrite green strength.
Technical scheme of the present invention is: a kind of soft magnetic ferrite preparation method, adopt polyvinyl acetate emulsion (white glue with vinyl) to replace all or part of polyvinyl alcohol (PVA) solution to do glue paste, add magneticsubstance dispersant special, glycerol softening agent, ethylene glycol defoamer, carry out slurrying, adopt wet processing ball milling spray drying granulation to prepare soft ferromagnetic powder.
A soft magnetic ferrite preparation method, comprises and take water as solvent, and steel ball is mill Jie, in expecting: the ratio of water: steel ball=1:0.5:6 feeds intake.Add 0.3～0.6% magneticsubstance dispersant special, 0.1～0.3% glycerol softening agent, after ball milling 3～5 hours, add 3～5% polyvinyl acetate emulsions, 0～15% concentration is 8% 1799 polyvinyl alcohol solutions, 0.02%～0.06% ethylene glycol defoamer, ball milling 1 hour, obtain treating the ferrite slurry of spray drying granulation, then at centrifugal spray drying tower, carry out spray drying granulation, get the wherein particle between 60～200 orders, obtain the soft magnetic ferrite powder that a kind of moulding green strength is high.
Slurry solid content: 60%～67%
Slurry viscosity is: <300 (mPa.s, 25 ℃)
Slurry mean particle size: 1.0-3.0 μ m.
After spray drying granulation, get the particle between 60 order-200 orders, formable high strength soft magnetism green compact.
Beneficial effect of the present invention is: the white glue with vinyl that the present invention uses is main adult for take vinyl acetate, polyvinyl alcohol, add the letex polymerizations such as other solvent, softening agent, initiator to form, its solids content 46-50%, viscosity >=250000 (mPa.s, 25 ℃), pH value 6-8.White glue with vinyl is normal temperature solidified, curing comparatively fast, bonding strength is higher, so conventional poly (vinyl alcohol) binder of alternative part or all of soft magnetic ferrite, reduced and boiled glue process, addition is only 1/5 left and right of polyvinyl alcohol solution simultaneously, therefore can obviously improve slurry solid content, reduce the energy consumption of spray drying granulation, improve particle loose density and mobility, simultaneously dump temperature is reduced to 150-190 ℃ by original 300～400 ℃, can reduce base substrate binder removal cracking phenomena.
Embodiment
Specific embodiment one, take NiZn soft magnetic ferrite and burn piece 100Kg, deionized water 50Kg, dispersion agent 0.3Kg, put the high energy ball mill that steel ball weight is 300Kg into, ball milling 4 hours, then the white glue with vinyl 3Kg that adds solids content 50%, concentration is 8% 1799PVA solution 10Kg, glycerol elasticizer plasticizing agent 0.1Kg, ethylene glycol defoamer 0.06Kg, ball milling obtains good fluidity for 1 hour, solid content is high treats spray drying granulation slurry, then at centrifugal spray drying tower, carry out spray drying granulation, get the wherein particle between 60～200 orders, obtain the soft magnetic ferrite powder that a kind of moulding green strength is high.
Specific embodiment two, take NiZn soft magnetic ferrite and burn piece 100Kg, deionized water 50Kg, dispersion agent 0.3Kg, put the high energy ball mill that steel ball weight is 300Kg into, ball milling 4 hours, the white glue with vinyl 4Kg that adds solids content 50%, concentration is 8% 1799PVA solution 5Kg, glycerol elasticizer plasticizing agent 0.2Kg, ethylene glycol defoamer 0.04Kg, ball milling obtains good fluidity for 1 hour, solid content is high treats spray drying granulation slurry, then at centrifugal spray drying tower, carry out spray drying granulation, get the wherein particle between 60～200 orders, obtain the soft magnetic ferrite powder that a kind of moulding green strength is high.
Specific embodiment three, take NiZn soft magnetic ferrite and burn piece 100Kg, deionized water 50Kg, dispersion agent 0.3Kg, put the high energy ball mill that steel ball weight is 300Kg into, ball milling 4 hours, the white glue with vinyl 5Kg that adds solids content 50%, glycerol elasticizer plasticizing agent 0.3Kg, ethylene glycol defoamer 0.02Kg, ball milling obtains good fluidity for 1 hour, solid content is high treats spray drying granulation slurry, then at centrifugal spray drying tower, carry out spray drying granulation, get the wherein particle between 60～200 orders, obtain the soft magnetic ferrite powder that a kind of moulding green strength is high.
Claims (3)
1. a soft magnetic ferrite preparation method, it is characterized in that: add 3～5% polyvinyl acetate emulsions (white glue with vinyl) and replace all or part of polyvinyl alcohol (PVA) solution to do glue paste, add 0.3～0.6% magneticsubstance dispersant special, 0.1～0.3% glycerol softening agent, 0.02%～0.06% ethylene glycol defoamer, adopts wet processing ball milling, spray drying granulation to prepare soft ferromagnetic powder.
2. a kind of soft magnetic ferrite preparation method as claimed in claim 1, is characterized in that adopting polyvinyl acetate emulsion (white glue with vinyl) to do that glue paste, glycerol are made softening agent, ethylene glycol is done defoamer and prepared ferrite slurry.
3. a kind of soft magnetic ferrite preparation method as claimed in claim 1, is characterized in that take that water is as solvent, and steel ball is mill Jie, in expecting: the ratio of water: steel ball=1:0.5:6 is ground.Slurry carries out spray drying granulation with centrifugal spray drying tower, gets the wherein particle between 60～200 orders, the high soft magnetic ferrite powder of moulding green strength obtaining.
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| CN201310607834.4A CN103693950A (en) | 2013-11-19 | 2013-11-19 | Preparation method for soft-magnetic ferrite powder |
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| CN201310607834.4A CN103693950A (en) | 2013-11-19 | 2013-11-19 | Preparation method for soft-magnetic ferrite powder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104387046A (en) * | 2014-05-19 | 2015-03-04 | 深圳顺络电子股份有限公司 | Ferrite powder and preparation method for ferrite-powder spray granule |
| CN111704453A (en) * | 2020-07-15 | 2020-09-25 | 广东泛瑞新材料有限公司 | Nickel-zinc ferrite granule and preparation method thereof |
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| CN101525232A (en) * | 2009-04-02 | 2009-09-09 | 沈建兴 | Nickel-zinc ferrite materials of high frequency electrodeless lamp power couplers and preparation method thereof |
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| CN104387046A (en) * | 2014-05-19 | 2015-03-04 | 深圳顺络电子股份有限公司 | Ferrite powder and preparation method for ferrite-powder spray granule |
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Application publication date: 20140402 |