CN105669179B - Ultra-thin magnetic screen sheet material and preparation method thereof - Google Patents
Ultra-thin magnetic screen sheet material and preparation method thereof Download PDFInfo
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- CN105669179B CN105669179B CN201511021314.0A CN201511021314A CN105669179B CN 105669179 B CN105669179 B CN 105669179B CN 201511021314 A CN201511021314 A CN 201511021314A CN 105669179 B CN105669179 B CN 105669179B
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
- C04B35/265—Compositions containing one or more ferrites of the group comprising manganese or zinc and one or more ferrites of the group comprising nickel, copper or cobalt
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/26—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor
- B28B1/265—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor pressure being applied on the slip in the filled mould or on the moulded article in the mould, e.g. pneumatically, by compressing slip in a closed mould
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3256—Molybdenum oxides, molybdates or oxide forming salts thereof, e.g. cadmium molybdate
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- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3296—Lead oxides, plumbates or oxide forming salts thereof, e.g. silver plumbate
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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Abstract
A kind of ultra-thin magnetic screen sheet material of present invention offer and preparation method thereof.The ultra-thin magnetic screen sheet material is made of ferrite, bonding agent, additive, surfactant, and thickness is 0.001 0.08mm；Specifically preparation process includes：Compounding, mixing, ball milling, briquet, pre-sintering, secondary ball milling, slurrying, spraying, a double sintering, the complex permeability of finally obtained ultra-thin magnetic screen piece at 13.56 mhz are μ '=70 200, μ "≤3.This method preparation process is simple and reliable, and lumber recovery is high, energy conservation and environmental protection, and magnetic sheet thickness can freely be controlled according to performance requirement；Using this method prepare ultra-thin magnetic sheet, have excellent magnetic shield performance, meet lightening magnetoelectric composites, functionalization, energy conservation and environmental protection trend demand for development, disclosure satisfy that touch screen, electronic printing etc. be further processed design requirement.
Description
Technical field
The present invention relates to a kind of ultra-thin magnetic screen sheet materials and preparation method thereof, belong to the technology neck of magnetoelectric composites
Domain.
Background technology
With the development of modern science and technology, Internet of Things, cloud computing, mobile Internet, big data etc. are new the one of mark
For the fast development of information technology and equipment, with wireless radio frequency discrimination RFID (Radio Frequency Identification,
Radio frequency identification), wireless payment NFC (Near Field Communication, near-field communication), wireless charging technology etc. be support
Electronic product and technology, beautiful, innovative, portability be increasingly accepted by the public and promote, further pushed electricity
Sub- product device is lightening, high-effect direction is developed, and especially magnetic screen sheet material faces the urgent market demand.
Magnetic screen piece also known as antifreeze plate are widely used in wireless charging, NFC and technical field of RFID, can be made into wireless charging
The antifreeze plate in magnetic conduction sheet, NFC and RFID device in electric appliance.Magnetic conduction sheet is in wireless charger, by high magnetic flux, to filling
The sympathetic magnetic field of electric appliance provides circuit, improves efficiency, while electronics being vortexed and is isolated, prevents electronics vortes interference circuit mainboard, make
Charger can work normally.Antifreeze plate in NFC and RFID device can absorb metal reflection attenuation wave and enhance magnetic field sense
Should distance, improve communication sensitivity.
Existing antifreeze plate material is mostly ferrite, thickness 0.08mm-0.5mm, these ferrite sheets are often adopted
It is mixed with bonding agents such as resins with ferrite powder and is pressed into plank, then pass through the side of extrusion molding, compression moulding or tape casting
Method is sintered.Such as China Patent Publication No. be CN203521092U, CN202425285U, CN102976726A,
The patent or patent of CN101213896A, CN103377787A, CN104766686A, CN104496451A, CN104387090A
Application.
In terms of preparation process, extruding-out process is low using slurry particle content, and density is relatively low after magnetic sheet sintering, magnetic
Performance is poor；And compression moulding technique, thickness 0.1mm thin magnetic plates below can not be prepared.Casting molding processes are current NFC magnetic
The most common technique of piece, casting slurry are mainly made of ferrite powder and organic system, then prepare thickness with slurry
The ferrite raw cook of 0.1mm, has just obtained ferrite magnetic sheet after sintering.
But the shortcomings that casting technique prepares antifreeze plate material there is also many aspects.First, being prepared using casting technique
Ferrite magnetic sheet finite thickness, the thickness limit being currently available is 0.08mm, and in process thickness control aspect, for
Equipment Requirement is harsh, and finished product rate is restricted.Second is that water soluble adhesive is easy to happen ferrite deposition layering, existing stream
Prolong moulding process production, mostly uses polyvinyl butyral (PVB) and make bonding agent, alcohol and dimethylbenzene make organic solvent.And two
Toluene is the stronger organic solvent of toxicity as toluene type organic, and a large amount of discharges in curtain coating would seriously pollute the environment, and dislike
Change operating condition and damages health.Third, the step of casting technique is more, the typical production flow of traditional ferrite sheet is more
Complexity, specially：A dispensing → doping → time ball milling → pre-burning → secondary ball milling → curtain coating → dumping sintering → test.These works
Skill step operation is complicated, and equipment production line is long, takes up a large area.The shortcomings that due to these technical aspects, causes at present
The country prepares producer's quantity of antifreeze plate material using casting technique batch, is only limitted to research and develop in powerful number company.
It can be seen that existing ferrite magnetic shielding slice material material is in the preparation, that there are recovery rates is low, process costs are high, uses
The shortcomings of range is limited and thickness larger (0.08mm or more), this volume production to the products such as wireless charging, NFC, RFID and technology
Change has larger impact.Therefore, lightening, simple and reliable process magnetic shielding material and technology of preparing are faced with great research and development and need
It asks.
Invention content
In view of the deficiencies of the prior art, one of the objects of the present invention is to provide a kind of ultra-thin magnetic screen sheet material, the materials
Expect with the excellent feature of thickness ultrathin, magnetic shield performance.
The second object of the present invention is to provide a kind of preparation method of above-mentioned ultra-thin magnetic screen sheet material.It is prepared by this method
Simple and reliable process, lumber recovery is high, energy conservation and environmental protection, and magnetic sheet thickness can freely be controlled according to performance requirement.
To achieve the above object, the present invention uses following technical scheme：
A kind of ultra-thin magnetic screen sheet material, is made of ferrite, bonding agent, additive, surfactant；The ultra-thin magnetic
Shielding slice material material thickness be 0.001-0.08mm (such as 0.002mm, 0.005mm, 0.008mm, 0.012mm, 0.015mm,
0.02mm、0.03mm、0.04mm、0.05mm、0.06mm、0.07mm、0.075mm、0.078mm)。
At 13.56 mhz, when measuring condition is 25 DEG C, magnetic conductivity real part μ '=70- of the ultra-thin magnetic screen sheet material
200, magnetic conductivity imaginary part μ "<5.
Above-mentioned ultra-thin magnetic screen sheet material, as a preferred implementation manner, the ferrite be NiZn ferrites,
At least one of NiZnMn ferrites, NiZnCu ferrites, NiZnCuMn ferrites, it is highly preferred that the ferritic ruler
Very little is 0.2-10 μm (such as 0.5 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm).The ferrite is by Fe2O3、
ZnO, CuO, NiO, MnO raw material are made, by mole content, in the ferrite raw material, Fe2O3：20-70%, ZnO：
10-50%, CuO：0-15%, NiO：10-50%, MnO：0-25%.
Above-mentioned ultra-thin magnetic screen sheet material, the bonding agent is water soluble adhesive, water as a preferred implementation manner,
Paste composition is uniform made from dissolubility bonding agent, and mobility is strong, easy to clean, and environmentally safe；It is highly preferred that described viscous
It is carboxymethyl cellulose and/or polyvinyl alcohol to tie agent.
Above-mentioned ultra-thin magnetic screen sheet material, the additive is Bi as a preferred implementation manner,2O3、WO3、Co2O3、
PbO、MoO3At least one of with lead glass；
Above-mentioned ultra-thin magnetic screen sheet material, the surfactant is isooctanol, tristearin as a preferred implementation manner,
At least one of sour polyoxyethylene ester, polyethylene glycol.
Above-mentioned ultra-thin magnetic screen sheet material, the additive quality is the ferrite as a preferred implementation manner,
Gross mass 1-5% (such as 1.5%, 2%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5%)；The surfactant
Quality is the 0.2-0.5% (such as 0.3%, 0.4%) of the ferritic gross mass；The quality of the bonding agent is the iron
The 5-20% (such as 6%, 8%, 12%, 16%, 18%, 19%) of the gross mass of oxysome.
The preparation method of above-mentioned ultra-thin magnetic screen sheet material, includes the following steps：
S1 carries out dispensing according to above-mentioned ferritic raw material components and proportioning, after drying, the additive is added, mixes
Mixture is obtained after uniformly；
S2 carries out a ball milling to mixture described in step S1, and drying obtains levigate mixture；
The obtained levigate mixture in step S2 is pressed into block by S3；
Block described in step S3 is carried out pre-sintering processing, obtains pre-burning caked mass by S4；
S5 is crushed pre-burning caked mass described in step S4, and carries out secondary ball milling, and powder object is obtained after drying
Material；
Bonding agent, water and surfactant are added into powder material described in step S5, stirs according to predetermined ratio by S6
It mixes uniformly, obtains the slurry of ferrite magnetic sheet；
S7 sprays to slurry described in step S6 on load bearing board according to different thickness requirements, to obtain required thickness
Ferrite sheet；
The load bearing board shove charge for being loaded with ferrite sheet that step S7 is obtained is carried out magnetic sheet sintering, then carries out magnetic sheet by S8
The ultra-thin magnetic screen sheet material is finally made in stripping.
In above-mentioned preparation method, as a preferred implementation manner, in step S1, the dosage of the additive is the iron
Oxysome raw material gross mass 1-5% (such as 1.2%, 1.5%, 1.8%, 2.2%, 1.8%, 3.2%, 3.6%, 4.2%,
4.8%)；It is highly preferred that the dosage of the additive is the 2-3% of the ferrite raw material gross mass.Further, described to add
It is by WO to add agent3、Bi2O3And Co2O3The mixture of composition, or by PbO, MoO3With lead glass composition mixture, or by PbO,
Bi2O3With the mixture of lead glass composition.Additive can be with mineralising, fluxing, resistance crystalline substance, improvement electromagnetic performance.
In above-mentioned preparation method, as a preferred implementation manner, in step S2, the ratio of grinding media to material of a ball milling is 8-
12:1 (such as 9:1、10:1), revolution is 250-320r/min (such as 255r/min, 265r/min, 275r/min, 285r/
Min, 295r/min, 305r/min, 315r/min), Ball-milling Time is 2-12h (such as 3h, 5h, 7h, 9h, 11h)；It is described levigate
The average particle diameter size of mixture reach 1-5 μm (such as 1.5 μm, 3 μm, 4 μm, 4.5 μm).
In above-mentioned preparation method, as a preferred implementation manner, in step S3, a length of 5-10cm of the block is wide
For 4-10cm, a height of 0.5-3cm；The press pressure of the compacting is 10T, pressing time 5s.
In above-mentioned preparation method, as a preferred implementation manner, in step S4, the temperature for being pre-sintered processing is
500-1000 DEG C (such as 520 DEG C, 550 DEG C, 580 DEG C, 620 DEG C, 660 DEG C, 700 DEG C, 740 DEG C, 780 DEG C, 820 DEG C, 860 DEG C,
900 DEG C, 940 DEG C, 980 DEG C), it is described be pre-sintered processing time be 0.5-6h (such as 0.6h, 1.0h, 1.5h, 2.0h, 2.5h,
3.0h、3.5h、4.0h、4.5h、5.0h、5.3h、5.6h、5.8h).Pre-sintering can be such that ferrite is densified, and volume is received
Contracting.
In above-mentioned preparation method, as a preferred implementation manner, in step S5, the ratio of grinding media to material of the secondary ball milling is 8-
12:1 (such as 9:1、10:1), revolution is 250-280r/min (such as 255r/min, 265r/min, 275r/min), when ball milling
Between be 2-48h (such as 2.0h, 5.0h, 7.0h, 10h, 15h, 18h, 20h, 25h, 30h, 35h, 40h, 45h, 48h)；The powder
The average grain diameter of last material is 0.2-1 μm (such as 0.5 μm, 0.7 μm).Secondary ball milling by lump material grind into powder, with
In the slurry for preparing mobility.
In above-mentioned preparation method, as a preferred implementation manner, in step S6, the addition of the surfactant is
The 0.2-0.5% (such as 0.3%, 0.4%) of ferrite raw material gross mass；The addition of the bonding agent is that ferrite raw material is total
The 5-20% (such as 6%, 8%, 12%, 16%, 18%, 19%) of quality；The addition of the water is the total matter of ferrite raw material
The 10-40% (such as 12%, 15%, 18%, 25%, 30%, 33%, 36%, 38%) of amount.
In above-mentioned preparation method, as a preferred implementation manner, in step S7, before the spraying, releasing agent is used
Load bearing board is uniformly smeared, with conveniently stripped；It is highly preferred that the releasing agent is in paraffin, beeswax, palm wax or n-alkane
It is at least one.
In above-mentioned preparation method, as a preferred implementation manner, in step S8, the load bearing board is zirconium oxide or oxidation
Aluminium ceramic burning-resisting board.
In above-mentioned preparation method, as a preferred implementation manner, in step S7, the spraying is completed using flush coater,
It is preferred that using the flush coater with agitating function.Above-mentioned flush coater, using Typical spray machine can meet demand, and use carry
The flush coater effect of agitating function is more preferable.
The inventors discovered that using stirring spraying process, it can be used for substituting original casting technique, there are three aspects for tool
Unique advantage：(1) thickness of magnetic sheet uses spraying method, most thin to accomplish 0.001mm, and can customize magnetic according to demand
The thickness of piece；(2) spraying process step operation is easy, control parameter is few and widely applicable, at low cost；(3) spraying process can be with
It is sprayed directly on ceramic burning-resisting board, without film-substrate for being cast, preparation efficiency is high.
In above-mentioned preparation method, as a preferred implementation manner, in step S8, the temperature of the sintering is 800-1100
DEG C (such as 820 DEG C, 850 DEG C, 880 DEG C, 920 DEG C, 960 DEG C, 1000 DEG C, 1050 DEG C, 1080 DEG C, 1090 DEG C), the sintering
Time is 0.5-5h (such as 0.8h, 1.2h, 1.5h, 2.0h, 2.5h, 3.0h, 3.5h, 4.0h, 4.5h, 4.8h).
One side film can be carried out first to above-mentioned ultra-thin magnetic screen sheet material, directly obtain one side film magnetic screen piece.
One side film magnetic screen piece using laser cutting or the broken magnetic of broken magnetomechanical, then can be carried out another side overlay film, obtained soft
The magnetic screen piece of property.
Above-mentioned magnetic screen piece can carry out overlay film into electromagnetic shielding piece, not only armoured magnetic field, also shields with aluminium foil or copper foil
Electric field.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) ultra-thin magnetic screen sheet material provided by the invention, is prepared, thickness using the method for spraying slurry
It is unrestricted, it is most thin to accomplish 0.001mm, and can freely regulate and control according to demand, this is that existing other technologies method is difficult to do
It arrives.
(2) preparation method of ultra-thin magnetic screen sheet material provided by the invention, easy to operate, lumber recovery is high, at low cost.
(3) ultra-thin magnetic screen sheet material provided by the invention and preparation method thereof, use is that common water solubility is viscous
Agent is connect, for environmental nonpollution, belongs to environmentally friendly material.
(4) magnetic screen piece of the invention and its technology of preparing, the material magnetic loss of acquisition is low, and μ " is mostly below 3.
According to application demand, can last layer double faced adhesive tape and protective film, centrifugation be easily pasted again in material surface
Paper etc. can adhere to the position that antenna modules, mobile phone shell, screen etc. need magnetic screen as needed in this way.
Specific implementation mode
In order to make the content of the present invention more clearly understood, below according to specific embodiments of the present invention, to this
Invention is described in further detail.
The various reagents and raw material used in following embodiment are commercial product.
Embodiment 1
The present embodiment prepares a kind of ultra-thin electromagnetic shielding slice material material, and wherein ferrite thickness is 0.001mm, specific to prepare step
It is rapid as follows：
(1) according to 50mol%Fe2O3, 20mol%ZnO, 10mol%CuO, 20mol%NiO ratio carry out dispensing, dry
The WO of ferrite raw material powder gross mass 0.3% is added after dry3, 1.5% Bi2O3, 0.2% Co2O3Mixture is as addition
Agent obtains mixture after mixing.
(2) ball milling is carried out to above-mentioned mixture, using planetary ball mill, ferrite raw material powder gross mass is added
1% water, ratio of grinding media to material 8, revolution 300r/min, Ball-milling Time 2h so that the average particle diameter size of mixture reaches 5 μm, together
Shi Jinhang secondary dryings obtain levigate mixture.
(3) levigate mixture is pressed into the block of 10cm long, 5cm wide, 1cm high using press, press pressure 10T,
Pressing time is 5s.
(4) block of briquet is subjected to pre-sintering processing, 800 DEG C of pre-sintering temperature is pre-sintered time 3h, obtains pre-
It is sintered block；
(5) the pre-burning caked mass of acquisition is crushed, and carries out secondary ball milling, ratio of grinding media to material 10, revolution 270r/min,
Ball-milling Time is 48h, obtains powder material, and average particle size is 0.3 μm；
(6) into above-mentioned powder material, bonding agent is separately added into according to the 12% of ferrite raw material powder gross mass, 33%
And pure water, bonding agent are carboxymethyl cellulose, while the surfactant that ferrite raw material powder gross mass 0.5% is added is different pungent
Alcohol stirs evenly, and obtains the slurry of ferrite magnetic sheet；
(7) slurry that will be prepared is sprayed to using flush coater and is coated on the zirconia ceramics load bearing board of paraffin, spraying
The ferrite sheet of 0.00105mm thickness；
(8) the zirconia ceramics load bearing board of ferrite sheet will be loaded with, shove charge carries out magnetic sheet sintering, 1000 DEG C of sintering temperature,
Sintering time 5h obtains the magnetic screen piece that thickness is 0.001mm, then carries out the stripping of magnetic screen piece, cover last layer again later
PE protective films are simultaneously cut out, and the ultra-thin magnetic screen sheet material is finally made.
100 magnetic screen pieces, yield rate 92% are produced using this method.
Alloy magnetic screen piece performance is measured at 25 DEG C.13.56HMz is measured using Agilent 4294A impedance analyzers
Under complex permeability, magnetic conductivity real part μ '=70, magnetic conductivity imaginary part μ "=2.
Embodiment 2
The present embodiment prepares a kind of ultra-thin electromagnetic shielding slice material material, and wherein ferrite thickness is 0.08mm, specific to prepare step
It is rapid as follows：
(1) according to 70mol%Fe2O3, 10mol%ZnO, 5mol%CuO, the ratio progress dispensing of 15mol%NiO, drying
The WO of ferrite raw material powder gross mass 0.5% is added afterwards3, 2% Bi2O3, 0.5% Co2O3The additives such as mixture conduct,
Mixture is obtained after mixing.
(2) ball milling is carried out to above-mentioned mixture, using planetary ball mill, ferrite raw material powder gross mass is added
1% water, ratio of grinding media to material 8, revolution 300r/min, Ball-milling Time 6h so that the average particle diameter size of mixture reaches 2 μm, together
Shi Jinhang secondary dryings obtain levigate mixture.
(3) levigate mixture is pressed into the block of 8cm long, 6cm wide, 2cm high, press pressure 10T, pressure using press
Time processed is 5s.
(4) block of briquet is subjected to pre-sintering processing, 620 DEG C of pre-sintering temperature is pre-sintered time 6h, obtains pre-
It is sintered block；
(5) the pre-burning caked mass of acquisition is crushed, and carries out secondary ball milling, ratio of grinding media to material 10, revolution 270r/min,
Ball-milling Time is 16h, obtains powder material, and average particle size is 0.6 μm；
(6) into above-mentioned powder material, bonding agent is separately added into according to the 5% of ferrite raw material powder gross mass, 40%
And pure water, bonding agent is PVAC polyvinylalcohol 1788, while the surfactant of ferrite raw material powder gross mass 0.2% is added
Polyoxyethylene stearic acid ester (CAS:9005-00-9 is purchased from lark prestige Science and Technology Ltd.), it stirs evenly, obtains ferrite magnetic
The slurry of piece；
(7) slurry that will be prepared is sprayed to using flush coater and is coated on the zirconia ceramics load bearing board of beeswax, spraying
The ferrite sheet of 0.065mm thickness；
(8) load bearing board of zirconia of ferrite sheet will be loaded with, shove charge carries out magnetic sheet sintering, 900 DEG C of sintering temperature, when sintering
Between 1h, obtain thickness be 0.06mm magnetic screen piece, then carry out magnetic screen piece stripping, cover last layer PE protective films again later
And cut out, the ultra-thin magnetic screen sheet material is finally made.
100 magnetic screen pieces, yield rate 90% are produced using this method.
Alloy property is measured at 25 DEG C.Plural number under 13.56HMz is measured using Agilent 4294A impedance analyzers
Magnetic conductivity, magnetic conductivity real part μ '=110, magnetic conductivity imaginary part μ "=3.
Embodiment 3
The present embodiment prepares a kind of ultra-thin electromagnetic shielding slice material material, and wherein ferrite thickness is 0.06mm, specific to prepare step
It is rapid as follows：
(1) according to 30mol%Fe2O3, 21mol%ZnO, 9mol%CuO, 15mol%NiO, 25%MnO raw material proportioning
Dispensing is carried out, 0.5% PbO of ferrite raw material powder gross mass, 2% MoO are added after drying3, 0.5% lead glass mixing
Object obtains mixture after mixing as additive.
(2) ball milling is carried out to above-mentioned mixture, using planetary ball mill, ferrite raw material powder gross mass is added
1% water, ratio of grinding media to material 12, revolution 270r/min, Ball-milling Time 4h so that the average particle diameter size of mixture reaches 5 μm, together
Shi Jinhang secondary dryings obtain levigate mixture.
(3) above-mentioned levigate mixture is pressed into the block of 5cm long, 10cm wide, 3cm high using press, press pressure is
10T, pressing time 5s.
(4) block of briquet is subjected to pre-sintering processing, 500 DEG C of pre-sintering temperature is pre-sintered time 6h, obtains pre-
It is sintered block；
(5) the pre-burning caked mass of acquisition is crushed, and carries out secondary ball milling, ratio of grinding media to material 10, revolution 270r/min
Ball-milling Time is for 24 hours, to obtain powder material, and average particle size is 0.8 μm；
(6) into above-mentioned powder material, by the 20% of ferrite raw material powder gross mass, 10% be separately added into bonding agent and
Pure water, bonding agent are PVAC polyvinylalcohol 1788, while the surfactant that ferrite raw material powder gross mass 0.3% is added is poly-
Ethylene glycol 400, stirs evenly, and obtains the slurry of ferrite magnetic sheet；
(7) slurry that will be prepared is sprayed to using flush coater and is coated on the zirconia ceramics load bearing board of palm wax, spraying
The ferrite sheet of 0.065mm thickness；
(8) the zirconia ceramics load bearing board of ferrite sheet will be loaded with, shove charge carries out magnetic sheet sintering, 1100 DEG C of sintering temperature,
Sintering time 3h obtains the magnetic screen piece that thickness is 0.06mm, then carries out the stripping of magnetic screen piece, cover last layer PE again later
Protective film is simultaneously cut out, and the ultra-thin magnetic screen sheet material is finally made.
100 magnetic screen pieces, yield rate 92% are produced using this method.
Alloy property is measured at 25 DEG C.Plural number under 13.56HMz is measured using Agilent 4294A impedance analyzers
Magnetic conductivity, magnetic conductivity real part μ '=200, magnetic conductivity imaginary part μ "=2.5.
Embodiment 4
The present embodiment prepares a kind of ultra-thin electromagnetic shielding slice material material, and wherein ferrite thickness is 0.02mm, specific to prepare step
It is rapid as follows：
(1) by 40mol%Fe2O3, 10mol%ZnO, 50mol%NiO, carry out dispensing, ferrite raw material is added after drying
The PbO of powder gross mass 0.5%, 2% Bi2O3, 0.5% the additives such as lead glass mixture, mixed after mixing
Material.
(2) ball milling is carried out to above-mentioned mixture, using planetary ball mill, ferrite raw material powder gross mass is added
1% water, ratio of grinding media to material 12, revolution 270r/min, Ball-milling Time is for 24 hours so that and the average particle diameter size of mixture reaches 2 μm,
It is carried out at the same time drying, obtains levigate mixture.
(3) above-mentioned levigate mixture is pressed into the block of 10cm long, 10cm wide, 0.5cm high, press pressure using press
For 10T, pressing time 5s.
(4) block of briquet is subjected to pre-sintering processing, 1000 DEG C of pre-sintering temperature is pre-sintered time 6h, obtains
Pre-burning block；
(5) the pre-burning caked mass of acquisition is crushed, and carries out secondary ball milling, ratio of grinding media to material 10, revolution 260r/min,
Ball-milling Time is 18h, obtains powder material, and average particle size is 0.2 μm；
(6) into above-mentioned powder material, bonding agent and pure is added according to 12%, the 33% of ferrite raw material powder gross mass
Water, bonding agent is PVAC polyvinylalcohol 1788, while the poly- second of surfactant of ferrite raw material powder gross mass 0.3% is added
Glycol 400, stirs evenly, and obtains the slurry of ferrite magnetic sheet；
(7) slurry that will be prepared is sprayed to using flush coater and is coated on the zirconia ceramics load bearing board of palm wax, spraying
The ferrite sheet of 0.022mm thickness；
(8) the zirconia ceramics load bearing board of ferrite sheet will be loaded with, shove charge carries out magnetic sheet sintering, 1100 DEG C of sintering temperature,
Sintering time 1h obtains the magnetic screen piece that thickness is 0.02mm, then carries out the stripping of magnetic screen piece, cover last layer PE again later
Protective film is simultaneously cut out, and the ultra-thin magnetic screen sheet material is finally made.
100 magnetic screen pieces, yield rate 93% are produced using this method.
Alloy property is measured at 25 DEG C.Plural number under 13.56HMz is measured using Agilent 4294A impedance analyzers
Magnetic conductivity, magnetic conductivity real part μ '=130, magnetic conductivity imaginary part μ "=3.
Embodiment 5
The present embodiment prepares a kind of ultra-thin electromagnetic shielding slice material material, and wherein ferrite thickness is 0.04mm, specific to prepare step
It is rapid as follows：
(1) according to 40mol%Fe2O3, 50mol%ZnO, 10mol%NiO ratio carry out dispensing, after drying be added iron oxygen
The WO of body raw material powder gross mass 0.3%3, 1.5% Bi2O3, 0.2% Co2O3Mixture is as additive, after mixing
Obtain mixture.
(2) ball milling is carried out to above-mentioned mixture, using planetary ball mill, ferrite raw material powder gross mass is added
1% water, ratio of grinding media to material 10, revolution 300r/min, Ball-milling Time 32h so that the average particle diameter size of mixture reaches 2.5 μ
M is carried out at the same time secondary drying, obtains levigate mixture.
(3) above-mentioned levigate mixture is pressed into the block of 5cm long, 4cm wide, 1cm high using press, press pressure is
10T, pressing time 5s.
(4) block of briquet is subjected to pre-sintering processing, 700 DEG C of pre-sintering temperature is pre-sintered time 3h, obtains pre-
It is sintered block；
(5) the pre-burning caked mass of acquisition is crushed, and carries out secondary ball milling, ratio of grinding media to material 10, revolution 270r/min,
Ball-milling Time is 16h, obtains powder material, and average particle size is 0.4 μm；
(6) into above-mentioned powder material, bonding agent is separately added into according to the 12% of ferrite raw material powder gross mass, 33%
And pure water, bonding agent are carboxymethyl cellulose, while the surfactant that ferrite raw material powder gross mass 0.5% is added is different pungent
Alcohol stirs evenly, and obtains the slurry of ferrite magnetic sheet；
(7) slurry that will be prepared is sprayed to using flush coater and is coated on the zirconia ceramics load bearing board of paraffin, spraying
The ferrite sheet of 0.045mm thickness；
(8) it will be loaded with the zirconia ceramics load bearing board of ferrite sheet, shove charge carries out magnetic sheet sintering, and 900 DEG C of sintering temperature is burnt
Time 5h is tied, the magnetic screen piece that thickness is 0.04mm is obtained, then carries out the stripping of magnetic screen piece, last layer PE is covered again later and protects
Cuticula is simultaneously cut out, and the ultra-thin magnetic screen sheet material is finally made.
100 magnetic screen pieces, yield rate 92% are produced using this method.
Alloy magnetic screen piece performance is measured at 25 DEG C.13.56HMz is measured using Agilent 4294A impedance analyzers
Under complex permeability, magnetic conductivity real part μ '=70, magnetic conductivity imaginary part μ "=2.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (15)
1. a kind of ultra-thin magnetic screen sheet material, which is characterized in that the ultra-thin magnetic screen sheet material by ferrite, bonding agent, add
Agent, surfactant is added to be made；
The quality of the surfactant is the 0.2-0.5% of the ferritic gross mass；The quality of the bonding agent is institute
State the 5-20% of ferritic gross mass；
The bonding agent is water soluble adhesive；
The ultra-thin magnetic screen sheet material thickness is 0.001-0.08mm；
The preparation method of the ultra-thin magnetic screen sheet material includes：
Slurry is sprayed on load bearing board, to obtain the ferrite sheet of required thickness.
2. ultra-thin magnetic screen sheet material according to claim 1, which is characterized in that the ferrite be NiZn ferrites,
At least one of NiZnMn ferrites, NiZnCu ferrites, NiZnCuMn ferrites.
3. ultra-thin magnetic screen sheet material according to claim 2, which is characterized in that the ferrite is by Fe2O3、ZnO、CuO、
NiO, MnO raw material are made, by mole content, in the ferrite raw material, Fe2O3：20-70%, ZnO：10-50%,
CuO：0-15%, NiO：10-50%, MnO：0-25%.
4. ultra-thin magnetic screen sheet material according to claim 2, which is characterized in that the ferritic size is 0.2-10 μ
m。
5. ultra-thin magnetic screen sheet material according to claim 1, which is characterized in that the bonding agent is carboxymethyl cellulose
And/or polyvinyl alcohol；The additive is Bi2O3、WO3、Co2O3、PbO、MoO3At least one of with lead glass；The surface
Activating agent is at least one of isooctanol, polyoxyethylene stearic acid ester, polyethylene glycol.
6. ultra-thin magnetic screen sheet material according to claim 1, which is characterized in that the additive quality is the ferrite
Gross mass 1-5%.
7. a kind of preparation method of ultra-thin magnetic screen sheet material, which is characterized in that
The ultra-thin magnetic screen sheet material is made of ferrite, bonding agent, additive, surfactant；
The quality of the surfactant is the 0.2-0.5% of the ferritic gross mass；The quality of the bonding agent is institute
State the 5-20% of ferritic gross mass；
The bonding agent is water soluble adhesive；
The ultra-thin magnetic screen sheet material thickness is 0.001-0.08mm；
The preparation method includes the following steps：
S1 carries out dispensing according to the ferritic raw material components and proportioning, after drying, the additive is added, is uniformly mixed
After obtain mixture；
S2 carries out a ball milling to mixture described in step S1, and drying obtains levigate mixture；
The obtained levigate mixture in step S2 is pressed into block by S3；
Block described in step S3 is carried out pre-sintering processing, obtains pre-burning caked mass by S4；
S5 is crushed pre-burning caked mass described in step S4, and carries out secondary ball milling, and powder material is obtained after drying；
Bonding agent, water and surfactant are added into powder material described in step S5 according to predetermined ratio by S6, and stirring is equal
It is even, obtain the slurry of ferrite magnetic sheet；The predetermined ratio is：The addition of the surfactant is that the ferrite is former
Expect the 0.2-0.5% of gross mass；The addition of the bonding agent is the 5-20% of the ferrite raw material gross mass；The water
Addition is the 10-40% of the ferrite raw material gross mass；
S7 sprays to slurry described in step S6 on load bearing board according to different thickness requirements, to obtain the iron of required thickness
Oxysome piece；
The load bearing board shove charge for being loaded with ferrite sheet that step S7 is obtained is carried out magnetic sheet sintering, then carries out the stripping of magnetic sheet by S8,
The ultra-thin magnetic screen sheet material is finally made.
8. preparation method according to claim 7, which is characterized in that in step S1, the dosage of the additive is the iron
The 1-5% of oxysome raw material gross mass.
9. preparation method according to claim 8, which is characterized in that the dosage of the additive is that the ferrite raw material is total
The 2-3% of quality.
10. preparation method according to claim 9, which is characterized in that the additive is by WO3、Bi2O3And Co2O3Composition
Mixture, or by PbO, MoO3The mixture formed with lead glass, or by PbO, Bi2O3With the mixture of lead glass composition.
11. preparation method according to claim 7, which is characterized in that in step S2, the ratio of grinding media to material of a ball milling is 8-
12:1, revolution 250-320r/min, Ball-milling Time 2-12h；The average particle diameter size of the levigate mixture reaches 1-5
μm；In step S5, the ratio of grinding media to material of the secondary ball milling is 8-12:1, revolution 250-280r/min, Ball-milling Time 2-48h；
The average grain diameter of the powder material is 0.2-1 μm.
12. according to preparation method described in claim 11, which is characterized in that in step S3, a length of 5-10cm of the block is wide
For 4-10cm, a height of 0.5-3cm；The press pressure of the compacting is 10T, pressing time 5s.
13. preparation method according to claim 7, which is characterized in that in step S4, the temperature for being pre-sintered processing is
500-1000 DEG C, the time for being pre-sintered processing is 0.5-6h.
14. preparation method according to claim 7, which is characterized in that in step S7, before the spraying, use releasing agent
Load bearing board is uniformly smeared, with conveniently stripped.
15. according to preparation method described in claim 14, which is characterized in that the releasing agent is paraffin, beeswax, palm wax or just
At least one of structure alkane；The load bearing board is zirconium oxide or aluminum oxide ceramic bearing burning plate；The spraying is using with stirring
The flush coater of function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511021314.0A CN105669179B (en) | 2015-12-30 | 2015-12-30 | Ultra-thin magnetic screen sheet material and preparation method thereof |
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| CN107910152A (en) * | 2017-11-23 | 2018-04-13 | 苏州科茂电子材料科技有限公司 | A kind of flexible magnetic material and preparation method thereof |
| CN108503351B (en) * | 2018-05-29 | 2021-07-30 | 娄底市玖鑫电子科技有限公司 | Magnetic separation sheet for wireless charging and preparation method thereof |
| CN108911732B (en) * | 2018-07-06 | 2020-10-23 | 横店集团东磁股份有限公司 | High Bs ferrite sheet for wireless charging and preparation method thereof |
| CN110876278A (en) * | 2019-02-01 | 2020-03-10 | 江苏金羿先磁新材料科技有限公司 | Magnetic shielding sheet with fragrance and preparation method and application thereof |
| CN113735573B (en) * | 2021-08-27 | 2022-08-16 | 西安交通大学 | Low-loss NiCuZn soft magnetic ferrite material for NFC and preparation method and application thereof |
| CN113716950B (en) * | 2021-11-01 | 2022-01-25 | 天通控股股份有限公司 | Low-temperature sintered flexible magnetic sheet and preparation method thereof |
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