CN107266062A - A kind of anisotropy Co2Z-type hexad ferrite magnetic core and preparation method thereof - Google Patents
A kind of anisotropy Co2Z-type hexad ferrite magnetic core and preparation method thereof Download PDFInfo
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- CN107266062A CN107266062A CN201710657036.0A CN201710657036A CN107266062A CN 107266062 A CN107266062 A CN 107266062A CN 201710657036 A CN201710657036 A CN 201710657036A CN 107266062 A CN107266062 A CN 107266062A
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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
- C04B35/2608—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead
- C04B35/2633—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead containing barium, strontium or calcium
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- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/0302—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions
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- H01F1/0315—Ferrites
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- 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
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- 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
- C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3275—Cobalt oxides, cobaltates or cobaltites or oxide forming salts thereof, e.g. bismuth cobaltate, zinc cobaltite
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Abstract
The invention discloses a kind of anisotropy Co2Z-type hexad ferrite magnetic core and preparation method thereof, it is mainly by BaCO3、Co2O3、Fe2O3Three kinds of raw materials are prepared from, and its structural formula is 3BaO2CoO12Fe2O3.Its preparation method is as follows：Stoichiometrically proportioning weighs raw material, and the material after ball mill mixing to acquisition is dried, crushed, sieved；Material after sieving is subjected to pre-burning, then adds and secondary ball milling batch mixing is carried out after sintering aid；By secondary ball milling material and PVB solution, plasticizer and dispersant, casting slurry is made；It is cast, is horizontally oriented in magnetic field on a pet film, obtains the consistent cast sheet of orientation；Punching press is carried out to cast sheet, and dumping is carried out to unnecessary glue, then sinters, obtains anisotropy Co2Z-type hexad ferrite magnetic core.Anisotropy Co prepared by the present invention2Z-type hexad ferrite magnetic core still has high magnetic permeability and high quality factor at 1GHz, available for preparing hyperfrequency chip inductor.
Description
Technical field
The invention belongs to ferrite core material preparing technical field, and in particular to a kind of anisotropy Co2Z-type hexgon iron
Ferrite core and preparation method thereof.
Background technology
Electronics and developing rapidly for information technology propose requirements at the higher level to magnetic element performance, high performance magnetic element
Miniaturization, high frequency and powerization turn into development trend, and core material is the key of magnetic element.
FERRITE CORE is usually to be made up of iron oxide and other one or more metal oxides or carbonate, with magnetic
Conductance is higher, and less advantage is lost, is widely used in electronic device.At present, the A of CN 101859622 disclose one kind
The manufacture method of intermediate frequency low-loss MnZn ferrite magnetic core, the MnZn FERRITE COREs of manufacture have lower loss, higher
Saturation flux density.The A of CN 104045333 disclose a kind of preparation side of the NiZn FERRITE COREs applied to power inductance
Method, with high magnetic permeability, high saturation and magnetic intensity, high intensity and high resistance to sudden heating.But the work of two class FERRITE COREs of the above
Working frequency is relatively low, governs the further development and application of ferrite magnetic powder core.
The content of the invention
The anisotropy Co of magnetic core element working frequency can be effectively improved it is an object of the invention to provide a kind of2Z-type hexagonal
FERRITE CORE and preparation method thereof.
This anisotropy Co that the present invention is provided2Z-type hexad ferrite magnetic core, is by BaCO3、Co2O3、Fe2O3Three kinds
Raw material is prepared from, and the mol ratio of three kinds of components is 3:1:12, its structural formula is 3BaO2CoO12Fe2O3。
A kind of anisotropy Co of the present invention2The preparation method of Z-type hexad ferrite magnetic core, including following preparation process：
(1) 3BaO2CoO12Fe is pressed2O3Stoichiometric weighs the pure BaCO of analysis3、Co2O3、Fe2O3Raw material, plus
Enter ball-milling medium and carry out ball mill mixing, the material of acquisition is dried, crush, sieved；
(2) material after being sieved in step (1) is subjected to pre-burning under the conditions of design temperature, then added in Preburning material
Secondary ball milling batch mixing is carried out after sintering aid；
(3) material of secondary ball milling in step (2) is mixed with PVB solution, and adds plasticizer and dispersant, made
Casting slurry；
(4) casting slurry in step (3) is cast on a pet film, and be horizontally oriented in magnetic field, obtained after drying
Obtain the consistent cast sheet of ferrite powder orientation of easy magnetization axis；
(5) step (4) cast sheet carries out punching press, and dumping and then sintering are carried out to unnecessary glue, obtains anisotropy
Co2Z-type hexad ferrite magnetic core.
In the step (1), ball-milling medium is zirconia ball, and Ball-milling Time is 5~6h.
Calcined temperature in the step (2) is 1200~1300 DEG C, and burn-in time is 2~3h；Sintering aid is Bi2O3, its
Addition is the 1~3% of Preburning material weight.
PVB solution concentrations in the step (3) are 40~50wt%, addition for secondary ball milling weight of material 40~
50%；Plasticizer is repefral, and addition is the 0.5~1% of PVB solution weights；Dispersant is polyethylene glycol
Octyl phenyl ether, addition is the 1~2% of secondary ball milling weight of material.
Drying temperature in the step (4) is 40~60 DEG C.
Dump temperature is 230~260 DEG C in described step (5), and the time is 10~12h；Sintering temperature be 1200~
1300 DEG C, the time is 5~7h.
It is of the invention that there are following outstanding advantages compared with the preparation method of existing FERRITE CORE：
1、Co2The Z-type hexad ferrite plane magnetocrystalline anisotropy strong because existing, natural resonant frequency can reach in theory
10 magnetic conductivity can be still maintained for more than to 3.4GHz, and 2GHz frequencies.The present invention utilizes Co2Z-type hexad ferrite
Characteristic, is prepared for a kind of anisotropy magnetic core, can be in the larger magnetic conductivity of holding simultaneously, can with higher working frequency
To realize magnetic element miniaturization, high frequency.
2nd, the present invention uses magnetic field to Co2Z-type hexad ferrite cast sheet is horizontally oriented, and can obtain Co2Z-type hexagonal
The consistent magnetic core of ferrite orientation of easy magnetization axis, possesses higher quality factor.
3rd, anisotropy Co of the present invention2The preparation technology of Z-type hexad ferrite magnetic core is simple, simple operation, raw
Produce efficiency high.
Brief description of the drawings
Fig. 1 is process chart of the invention；
The anisotropy Co that Fig. 2 is prepared for the present invention2Z-type hexad ferrite magnetic core section SEM schemes.
Embodiment
Experimental program of the present invention is clearly and completely described with reference to embodiment.Based on the implementation in the present invention
Example, all other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made is belonged to
The scope of protection of the invention.
Embodiment 1
According to Co2The ferritic structural formula of Z-type is 3BaO2CoO12Fe2O3Ratio weigh raw material BaCO3、Co2O3、
Fe2O3, add ball-milling medium zirconia ball and carry out ball mill mixing 5h, the material of acquisition is dried, crush, sieved.Incited somebody to action
Material after the sieve pre-burning 2h under the conditions of 1300 DEG C, then adds sintering aid Bi in the material after pre-burning2O3, and carry out secondary
Ball mill mixing, wherein Bi2O3Addition is 1% of weight of material after pre-burning, and Ball-milling Time is 2h.
Take the material after 100g secondary ball millings and add the PVB solution 50g that concentration is 40wt% thereto, be well mixed
Afterwards, plasticizer phthalic acid dimethyl ester 0.5g and dispersant Triton X-100 2g are added, curtain coating slurry is configured to
Material.
Casting slurry is cast on a pet film, and after being horizontally oriented in magnetic field, in 60 DEG C of bars using casting technique
Dried under part, obtain the consistent cast sheet of ferrite powder orientation of easy magnetization axis.
Punching press is carried out to cast sheet according to the shape needed for magnetic core, dimensions, and dumping, so is carried out to unnecessary glue
After be sintered, dump temperature is 230 DEG C, and the time is 10h, and sintering temperature is 1300 degrees Celsius, and the time is 5h, is obtained each to different
Property Co2Z-type hexad ferrite magnetic core, its section SEM figures are as shown in Figure 2, it is seen that hexagonal cell grain be orientated it is consistent, can keep compared with
Big magnetic conductivity simultaneously, and higher working frequency.Finally carry out magnetic property sign, its magnetic parameter such as following table：
Embodiment 2
According to Co2The ferritic structural formula of Z-type is 3BaO2CoO12Fe2O3Ratio weigh raw material BaCO3、Co2O3、
Fe2O3, add ball-milling medium zirconia ball and carry out ball mill mixing 5.5h, the material of acquisition is dried, crush, sieved.Will
Material after the sieving pre-burning 2.5h under the conditions of 1250 DEG C, then adds sintering aid Bi in the material after pre-burning2O3, and carry out
Secondary ball milling batch mixing, wherein Bi2O3Addition is 3% of weight of material after pre-burning, and Ball-milling Time is 3h.
Take the material after 100g secondary ball millings and add the PVB solution 45g that concentration is 45wt% thereto, be well mixed
Afterwards, plasticizer phthalic acid dimethyl ester 0.25g and dispersant Triton X-100 1.5g are added, curtain coating is configured to
Slurry.
Casting slurry is cast on a pet film, and after being horizontally oriented in magnetic field, in 50 DEG C of bars using casting technique
Dried under part, obtain the consistent cast sheet of ferrite powder orientation of easy magnetization axis.
Punching press is carried out to cast sheet according to the shape needed for magnetic core, dimensions, and dumping, so is carried out to unnecessary glue
After be sintered, dump temperature is 245 DEG C, and the time is 11h, and sintering temperature is 1250 DEG C, and the time is 6h, finally obtains each to different
Property Co2Z-type hexad ferrite magnetic core, and tested.Its magnetic parameter such as following table：
Embodiment 3
According to Co2The ferritic structural formula of Z-type is 3BaO2CoO12Fe2O3Ratio weigh raw material BaCO3、Co2O3、
Fe2O3, add ball-milling medium zirconia ball and carry out ball mill mixing 6h, the material of acquisition is dried, crush, sieved.Incited somebody to action
Material after the sieve pre-burning 3h under the conditions of 1200 DEG C, then adds sintering aid Bi in the material after pre-burning2O3, and carry out secondary
Ball mill mixing, wherein Bi2O3Addition is 2% of weight of material after pre-burning, and Ball-milling Time is 4h.
Take the material after 100g secondary ball millings and add the PVB solution 40g that concentration is 50wt% thereto, be well mixed
Afterwards, plasticizer phthalic acid dimethyl ester 0.2g and dispersant Triton X-100 1g are added, curtain coating slurry is configured to
Material.
Casting slurry is cast on a pet film, and after being horizontally oriented in magnetic field, in 40 DEG C of bars using casting technique
Dried under part, obtain the consistent cast sheet of ferrite powder orientation of easy magnetization axis.
Punching press is carried out to cast sheet according to the shape needed for magnetic core, dimensions, and dumping, so is carried out to unnecessary glue
After be sintered, dump temperature is 260 DEG C, and the time is 12h, and sintering temperature is 1200 DEG C, and the time is 7h, finally obtains each to different
Property Co2Z-type hexad ferrite magnetic core, and tested.Its magnetic parameter is as shown in the table：
Claims (10)
1. a kind of anisotropy Co2Z-type hexad ferrite magnetic core, it is characterised in that described anisotropy Co2Z-type hexgon iron oxygen
Body magnetic core is by BaCO3、Co2O3、Fe2O3Three kinds of raw materials are prepared from, and the mol ratio of three kinds of components is 3:1:12, its structural formula is
3BaO·2CoO·12Fe2O3。
2. a kind of anisotropy Co according to claim 12The preparation method of Z-type hexad ferrite magnetic core, including following system
Standby step：
(1) 3BaO2CoO12Fe is pressed2O3Stoichiometric weighs the pure BaCO of analysis3、Co2O3、Fe2O3Raw material, adds ball milling
Medium simultaneously carries out ball mill mixing, and the material of acquisition is dried, crush, sieved；
(2) material after being sieved in step (1) is subjected to pre-burning under the conditions of design temperature, is then added in Preburning material and help burning
Secondary ball milling batch mixing is carried out after agent；
(3) material of secondary ball milling in step (2) is mixed with PVB solution, and adds plasticizer and dispersant, make curtain coating
Slurry；
(4) casting slurry in step (3) is cast on a pet film, and be horizontally oriented in magnetic field, after drying, obtained
The consistent cast sheet of ferrite powder orientation of easy magnetization axis；
(5) punching press is carried out to step (4) cast sheet, and dumping is carried out to unnecessary glue, then sinters, obtains anisotropy
Co2Z-type hexad ferrite magnetic core.
3. a kind of anisotropy Co according to claim 22Z-type hexad ferrite magnetic core preparation method, it is characterised in that
In the step (1), ball-milling medium is zirconia ball, and Ball-milling Time is 5~6h.
4. a kind of anisotropy Co according to claim 22Z-type hexad ferrite magnetic core preparation method, it is characterised in that
Calcined temperature in the step (2) is 1200~1300 DEG C, and burn-in time is 2~3h.
5. a kind of anisotropy Co according to claim 22Z-type hexad ferrite magnetic core preparation method, it is characterised in that
Sintering aid in the step (2) is Bi2O3, its addition is the 1~3% of Preburning material weight.
6. a kind of anisotropy Co according to claim 22The preparation method of Z-type hexad ferrite magnetic core, its feature exists
In the PVB solution concentrations in the step (3) are 40~50wt%, and addition is the 40~50% of secondary ball milling weight of material.
7. a kind of anisotropy Co according to claim 22The preparation method of Z-type hexad ferrite magnetic core, its feature exists
In plasticizer is repefral in described step (3), and addition is the 0.5~1% of PVB solution weights；It is scattered
Agent Triton X-100, addition is the 1~2% of secondary ball milling weight of material.
8. a kind of anisotropy Co according to claim 22The preparation method of Z-type hexad ferrite magnetic core, its feature exists
In the drying temperature in described step (4) is 40~60 DEG C.
9. a kind of anisotropy Co according to claim 22The preparation method of Z-type hexad ferrite magnetic core, its feature exists
In dump temperature is 230~260 DEG C in described step (5), and the time is 10~12h.
10. according to a kind of anisotropy Co described in claim 22The preparation method of Z-type hexad ferrite magnetic core, it is characterised in that
Sintering temperature described in described step (5) is 1200~1300 DEG C, and the time is 5~7h.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110787970A (en) * | 2019-11-14 | 2020-02-14 | 湖南工程学院 | Ferrite raw material sheet forming equipment and forming method thereof |
| CN113264759A (en) * | 2021-05-20 | 2021-08-17 | 电子科技大学 | Low-loss high-frequency magnetic dielectric material and preparation method thereof |
| CN113307616A (en) * | 2021-05-14 | 2021-08-27 | 兰州大学 | Co2Preparation method of Z-type ferrite sintered sheet |
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| CN113264759A (en) * | 2021-05-20 | 2021-08-17 | 电子科技大学 | Low-loss high-frequency magnetic dielectric material and preparation method thereof |
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