CN111724963A - Tape casting method and device for directional arrangement of magnetic fillers and product - Google Patents
Tape casting method and device for directional arrangement of magnetic fillers and product Download PDFInfo
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- CN111724963A CN111724963A CN202010528169.XA CN202010528169A CN111724963A CN 111724963 A CN111724963 A CN 111724963A CN 202010528169 A CN202010528169 A CN 202010528169A CN 111724963 A CN111724963 A CN 111724963A
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- 238000010345 tape casting Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000012762 magnetic filler Substances 0.000 title claims abstract description 22
- 230000005291 magnetic effect Effects 0.000 claims abstract description 66
- 238000005266 casting Methods 0.000 claims abstract description 56
- 239000002002 slurry Substances 0.000 claims abstract description 35
- 238000001035 drying Methods 0.000 claims abstract description 6
- 230000006698 induction Effects 0.000 claims description 5
- 239000000696 magnetic material Substances 0.000 description 16
- 230000035699 permeability Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 239000002131 composite material Substances 0.000 description 7
- 229910000859 α-Fe Inorganic materials 0.000 description 7
- 239000002245 particle Substances 0.000 description 6
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000006247 magnetic powder Substances 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005294 ferromagnetic effect Effects 0.000 description 3
- 239000006249 magnetic particle Substances 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 238000009740 moulding (composite fabrication) Methods 0.000 description 3
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910002555 FeNi Inorganic materials 0.000 description 1
- 229910005347 FeSi Inorganic materials 0.000 description 1
- -1 FeSiAl Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005293 ferrimagnetic effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001004 magnetic alloy Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Images
Classifications
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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
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Soft Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The invention discloses a tape casting method for directional arrangement of magnetic fillers, which comprises the following steps: (1) preparing slurry containing magnetic filler; (2) carrying out tape casting on the slurry, and drying the tape casting slurry after the tape casting slurry is subjected to parallel magnetic field orientation to obtain an oriented tape casting film; the parallel magnetic field is generated by two groups of magnet groups which have opposite homopolarity and are arranged in parallel and are respectively positioned at the upper side and the lower side of the casting slurry, and the parallel magnetic field is parallel to the advancing direction of the casting slurry. The invention also discloses a tape casting device for implementing the tape casting method, which comprises a tape casting machine, a scraper, a base band and two groups of magnet groups, wherein the two groups of magnet groups are opposite in homopolar and parallel and are respectively positioned on the upper side and the lower side of the base band. The invention also discloses an oriented casting film prepared by the casting method, and the magnetic fillers are directionally arranged in the oriented casting film along the length direction.
Description
Technical Field
The invention relates to the technical field of magnetic materials, in particular to a tape casting method, a tape casting device and a tape casting product with directionally arranged magnetic fillers.
Background
Soft magnetic materials are a class of magnetic materials having high magnetic permeability and low coercivity. Soft magnetic materials are easily magnetized and demagnetized, and are widely used in electrical and electronic devices. There are many kinds of soft magnetic materials, and they can be classified into metal soft magnetic materials, soft magnetic ferrites, and soft magnetic composite materials. The metallic soft magnet has an advantage of high saturation magnetization, but has a disadvantage of low metal resistivity, so that eddy current loss is great when used at high frequencies, and permeability is drastically reduced, so that it cannot be used at medium and high frequencies, which is fatal to the soft magnetic material. The ferrite soft magnetic material has high resistivity, so the ferrite soft magnetic material has obvious advantages in medium and high frequency bands, but has the defect that the ferrite is a ferrimagnetic substance, so the saturation magnetization is low, and the ferrite soft magnetic material cannot meet the increasing power requirement of electronic equipment, so the ferrite soft magnetic material cannot be applied to a plurality of high-precision fields.
The soft magnetic composite material is formed by mixing and pressing ferromagnetic powder particles and an insulating medium. Compared with the traditional metal soft magnetic alloy and ferrite material, the material has a plurality of unique characteristics: because the ferromagnetic particles are very small (0.5-5 microns used at high frequency) and are separated by the non-magnetic electric insulating film substance, on one hand, eddy current can be isolated, and the material is suitable for higher frequency; on the other hand, due to the gap effect among the particles, the material has low magnetic permeability and constant magnetic conductivity; and because the particle size is small, the skin phenomenon basically does not occur, and the magnetic conductivity is more stable along with the change of the frequency. The inductor is mainly used for high-frequency inductors.
Soft magnetic composite systems currently in commercial use include: fe. FeSi, FeSiAl, FeNi, FeNiMo and the like. The adoption of the insulating medium to divide the magnetic particles is beneficial to the increase of the resistivity of the system and greatly reduces the eddy current loss. Recently, researchers have found that when the magnetic particles are flattened, the skin effect of the metal material is reduced, and the eddy current loss of the system can be further reduced. Meanwhile, after the metal magnetic particles are flattened, shape anisotropy can be generated, and due to the influence of a demagnetizing field, the magnetization characteristics of the flattened particles in different directions can be obviously different.
Patent specification CN1460661A discloses a method for preparing functionally graded material by tape casting, which comprises the following steps: 1) mixing ceramic powder and ferromagnetic metal powder with an organic solvent and an additive according to a certain proportion, and stirring in a ball mill to prepare uniformly dispersed slurry; 2) casting the film in a static magnetic field with the magnetic field intensity of 0.1-5 Tesla to form a film; 3) drying, sintering and forming. The patent technology mainly aims at particle type powder, but because the direction of a static magnetic field is vertical to a casting film, and the magnetic field intensity is not easy to control, the gradient distribution is difficult to ensure to be uniform.
Patent specification No. CN107545972A discloses a process for directional arrangement of magnetic fillers, comprising the following steps: s1: obtaining casting slurry, wherein the casting slurry comprises a magnetic filler with magnetic property; s2: casting the casting slurry by means of mutual displacement of a bearing carrier band and a scraper, wherein a magnetic field generation module for generating an induced magnetic field is arranged on the bearing carrier band and comprises a magnetic field N pole and a magnetic field S pole, and the magnetic field N pole and the magnetic field S pole are respectively arranged on two sides of the bearing carrier band; s3: the casting slurry is thermally cured. The orientation device of the patent technology is arranged on both sides of the casting film, but the orientation method inevitably causes magnetic powder to gather at both ends of the width direction of the casting film, and the orientation device can only be used for the orientation of the narrower casting film.
Disclosure of Invention
Aiming at the defects in the field, the invention provides a tape casting method for the directional arrangement of magnetic fillers, which utilizes the principle that the middle area can form a parallel magnetic field after the bar magnets are arranged in parallel, realizes the magnetic field orientation of a large-size diaphragm-shaped magnetic composite material through reasonable design of the magnet spacing, the magnetic induction intensity and the like, and obviously improves the magnetic properties of the obtained magnetic material such as the magnetic conductivity and the like. Compared with other orientation methods, the orientation method has the advantages of being faster and more efficient, and different magnetic induction intensities can be selected for carrying out magnetic field orientation according to actual conditions and requirements such as the magnetic strength of materials.
A tape casting method for directionally arranging magnetic fillers comprises the following steps:
(1) preparing slurry containing magnetic filler;
(2) carrying out tape casting on the slurry, and drying the tape casting slurry after the tape casting slurry is subjected to parallel magnetic field orientation to obtain an oriented tape casting film;
the parallel magnetic field is generated by two groups of magnet groups which have opposite homopolarity and are arranged in parallel and are respectively positioned at the upper side and the lower side of the casting slurry, and the parallel magnetic field is parallel to the advancing direction of the casting slurry.
According to the invention, the strip magnets are arranged in parallel to form two groups of magnet groups, and the two groups of magnet groups are placed in parallel to the casting direction, so that when the diaphragm-shaped magnetic composite material is not formed (such as casting slurry containing magnetic fillers just cast in the casting process), the strip magnets pass through parallel magnetic fields generated between the upper and lower groups of magnet groups with opposite homopolarity in parallel, and the magnetic powder in the finally obtained diaphragm is oriented and arranged along the casting direction.
Preferably, each group of magnet groups comprises a plurality of bar magnets which are arranged in parallel and have opposite homopolarity, and the distance between every two adjacent bar magnets is 0.5-5 cm.
Preferably, the distance between the two groups of magnet groups is 1-15 cm.
Preferably, the strength of the magnetic induction line between the two groups of magnet groups is not less than 100 gauss.
According to the invention, the arrangement mode of the strip magnets is optimized, and the distance between the adjacent strip magnets, the distance between two magnet groups and the magnetic induction intensity are controlled, so that a parallel magnetic field parallel to the advancing direction of the casting slurry is ensured to be generated.
Preferably, in the step (2), the casting temperature is 20-30 ℃, the speed of the casting slurry passing through the parallel magnetic field is 0.5-5 m/s, and the drying temperature is 65-75 ℃. The above parameters are preferably favorable for the orientation arrangement of the magnetic filler in the casting slurry, thereby improving the magnetic properties such as magnetic permeability and the like of the finally obtained magnetic material.
Preferably, the magnetic filler is in a sheet shape. The tape casting method is particularly suitable for the flaky magnetic fillers which are horizontally arranged along the tape casting direction without standing up.
The invention also provides a tape casting device for implementing the tape casting method, which comprises a tape casting machine, a scraper, a base band and two groups of magnet groups, wherein the two groups of magnet groups have homopolarity opposite, are arranged in parallel with the base band and are respectively positioned at the upper side and the lower side of the base band.
The tape casting forming device only needs to be added with two groups of magnet groups on the basis of the existing tape casting machine equipment, and is simple and convenient.
The invention also provides an oriented casting film prepared by the casting method, and the magnetic fillers are directionally arranged in the oriented casting film along the length direction. The length direction is the advancing direction of the casting slurry in the casting process, and the width direction is the horizontal direction perpendicular to the advancing direction of the casting slurry in the casting process. The magnetic permeability of the magnetic material with specific magnetic orientation prepared by the tape casting method is 30-50% higher than that of the magnetic material without magnetic orientation.
Compared with the prior art, the invention has the main advantages that: the invention makes the initial forming and unshaped casting slurry pass between two groups of magnet groups which have opposite homopolar and are arranged in parallel by simply improving the traditional casting method, and the magnetic fillers in the casting film are arranged along the direction of the magnetic field after being oriented by the parallel magnetic field, thereby obviously improving the performances of the magnetic material, such as magnetic conductivity, and the like.
Drawings
FIG. 1 is a schematic structural diagram of a magnetic field orientation member composed of two sets of upper and lower magnet sets, wherein (a) is a side view and (b) is a top view; in the figure: 1-upper reluctance, 2-lower reluctance;
FIG. 2 is a graph of magnetic permeability of a sheet-like carbonyl iron composite sample subjected to magnetic field orientation by the tape casting method of the present invention;
FIG. 3 is a graph of magnetic permeability of a sheet-like carbonyl iron composite sample without magnetic field orientation.
Detailed Description
The invention is further described with reference to the following drawings and specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The following examples are conducted under conditions not specified, usually according to conventional conditions, or according to conditions recommended by the manufacturer.
The tape casting device of this embodiment optimizes on traditional tape casting machine equipment basis, including tape casting machine, scraper, baseband and two sets of magnet group. As shown in fig. 1, the two sets of magnet sets are arranged with like poles opposite and parallel to the base band, and are respectively located at the upper and lower sides of the base band to form a magnetic field orientation member. The two poles of the magnet are respectively arranged in the casting direction in tandem.
The tape casting method for carrying out the directional arrangement of the magnetic filler by using the tape casting device specifically comprises the following steps: 42g of sheet carbonyl iron, 3g of cross-linking agent and 60mL of cyclohexanone are put into a beaker and put into an ultrasonic machine to be stirred and ultrasonically treated for 5 minutes, and then 23g of liquid glue (polyurethane), 1mL of wetting agent, 1mL of anti-settling agent and 0.5mL of defoaming agent are added into the beaker and put into the ultrasonic machine to be stirred and ultrasonically treated for 30 minutes to prepare sheet carbonyl iron polyurethane slurry with the volume fraction of 40 percent. Pouring the uniformly stirred slurry into a casting machine for casting, presetting the casting temperature to be 30 ℃, enabling the height of a scraper to be 0.4mm, and enabling a cast film just cast to parallelly pass through the middle of a parallel magnetic field generated by an upper group of magnet set and a lower group of magnet set at the speed of 0.5-5 m/s for orientation. After the completion of the orientation, the casting machine temperature was set to 70 ℃ and the casting film was dried for three hours. In order to detect the orientation effect, 10 pieces of square sheets of 30mm multiplied by 30mm are cut from the dried orientation casting film, the orientation casting film is stacked and then put into a flat hot press to be hot-pressed into a film plate, the hot pressing temperature is set to be 120 ℃, the pressure is set to be 5 tons, and the hot pressing time is set to be 25 seconds. The hot-pressed diaphragm was formed into a ring having an outer diameter of 7mm and an inner diameter of 2.98mm, and the permeability was measured coaxially with a network analyzer of type No. N5234A, the results of which are shown in FIG. 2.
By adopting the tape casting method, the conditions are consistent except that the magnetic field orientation is not carried out, and the magnetic permeability of the obtained material is shown in figure 3 and is obviously lower than that of the material after the magnetic field orientation.
Compared with the patent technology with the publication number of CN1460661A, the direction of the static magnetic field of the invention is horizontally parallel to the slurry, the invention is mainly used for the orientation of the flaky magnetic powder, and the static magnetic field can be conveniently realized by replacing different bar magnets, and can meet the orientation requirements of various flaky powders.
Compared with the patent technology with the publication number of CN107545972A, the orientation device in the invention is arranged at the upper side and the lower side of the casting slurry, has uniform magnetic field intensity, is not limited by the width of the casting film, and can be used for orientation of the casting film with wider width (the width can reach 40 cm).
Compared with the prior art, the invention can manufacture wider casting films, has better orientation effect and uniform magnetic powder distribution.
Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the above description of the present invention, and equivalents also fall within the scope of the invention as defined by the appended claims.
Claims (8)
1. A tape casting method for directionally arranging magnetic fillers is characterized by comprising the following steps:
(1) preparing slurry containing magnetic filler;
(2) carrying out tape casting on the slurry, and drying the tape casting slurry after the tape casting slurry is subjected to parallel magnetic field orientation to obtain an oriented tape casting film;
the parallel magnetic field is generated by two groups of magnet groups which have opposite homopolarity and are arranged in parallel and are respectively positioned at the upper side and the lower side of the casting slurry, and the parallel magnetic field is parallel to the advancing direction of the casting slurry.
2. The tape casting method according to claim 1, wherein each of the magnet groups comprises a plurality of bar magnets arranged in parallel and opposing in the same stage, and a distance between adjacent bar magnets is 0.5 to 5 cm.
3. The tape casting method according to claim 1, wherein a distance between the two magnet groups is 1 to 15 cm.
4. The casting method according to claim 1, wherein the magnetic filler is in a sheet form.
5. The casting method according to any one of claims 1 to 4, wherein the strength of magnetic induction lines between the two sets of magnets is not less than 100 Gauss.
6. The tape casting method according to claim 1, wherein in the step (2), the casting temperature is 20 to 30 ℃, the speed of the casting slurry passing through the parallel magnetic field is 0.5 to 5m/s, and the drying temperature is 65 to 75 ℃.
7. A tape casting apparatus for carrying out the tape casting method according to any one of claims 1 to 6, comprising a tape casting machine, a scraper, a base tape and two sets of magnet groups, wherein the two sets of magnet groups are arranged in a manner that homopolar faces each other, are parallel to the base tape, and are respectively positioned on the upper side and the lower side of the base tape.
8. The oriented casting film produced by the casting method according to any one of claims 1 to 6, wherein the magnetic filler is aligned in the oriented casting film in a longitudinal direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010528169.XA CN111724963A (en) | 2020-06-11 | 2020-06-11 | Tape casting method and device for directional arrangement of magnetic fillers and product |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010528169.XA CN111724963A (en) | 2020-06-11 | 2020-06-11 | Tape casting method and device for directional arrangement of magnetic fillers and product |
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| CN111724963A true CN111724963A (en) | 2020-09-29 |
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| CN202010528169.XA Pending CN111724963A (en) | 2020-06-11 | 2020-06-11 | Tape casting method and device for directional arrangement of magnetic fillers and product |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112712995A (en) * | 2020-12-18 | 2021-04-27 | 成都佳驰电子科技有限公司 | Preparation method of high-orientation magnetic wave-absorbing film |
| CN113771274A (en) * | 2021-11-10 | 2021-12-10 | 成都佳驰电子科技股份有限公司 | Low-cost magnetic wave-absorbing waterproof gasket preparation device and method |
| CN113963882A (en) * | 2021-10-19 | 2022-01-21 | 横店集团东磁股份有限公司 | Casting magnetic sheet magnetic powder orientation device and preparation method of wave-absorbing magnetic sheet |
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| JPH1022155A (en) * | 1996-07-05 | 1998-01-23 | Hitachi Metals Ltd | Manufacture of rare-earth permanent magnet and rare-earth permanent magnet |
| CN1362309A (en) * | 2000-12-28 | 2002-08-07 | 株式会社神户制钢所 | Hard tunide for cutting tool, hard-tunicle-coated cutting tool, method of manufacture of hard-tunicle and target for forming hard tunicle |
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-
2020
- 2020-06-11 CN CN202010528169.XA patent/CN111724963A/en active Pending
Patent Citations (4)
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|---|---|---|---|---|
| JPH1022155A (en) * | 1996-07-05 | 1998-01-23 | Hitachi Metals Ltd | Manufacture of rare-earth permanent magnet and rare-earth permanent magnet |
| CN1362309A (en) * | 2000-12-28 | 2002-08-07 | 株式会社神户制钢所 | Hard tunide for cutting tool, hard-tunicle-coated cutting tool, method of manufacture of hard-tunicle and target for forming hard tunicle |
| CN105981116A (en) * | 2013-10-01 | 2016-09-28 | 埃1023公司 | Magnetically enhanced energy storage system and methods |
| CN109148135A (en) * | 2018-08-28 | 2019-01-04 | 横店集团东磁股份有限公司 | It is a kind of to improve the aligning device and its implementation for inhaling wave magnetic sheet magnetic powder |
Non-Patent Citations (1)
| Title |
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| 廖丽: "外加静磁场下片状FeSiAl复合材料的干扰抑制性能", 《EMC材料应用》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112712995A (en) * | 2020-12-18 | 2021-04-27 | 成都佳驰电子科技有限公司 | Preparation method of high-orientation magnetic wave-absorbing film |
| CN113963882A (en) * | 2021-10-19 | 2022-01-21 | 横店集团东磁股份有限公司 | Casting magnetic sheet magnetic powder orientation device and preparation method of wave-absorbing magnetic sheet |
| CN113771274A (en) * | 2021-11-10 | 2021-12-10 | 成都佳驰电子科技股份有限公司 | Low-cost magnetic wave-absorbing waterproof gasket preparation device and method |
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Application publication date: 20200929 |