KR101661067B1 - Manufacturing method of metal polymer complex sheet - Google Patents
Manufacturing method of metal polymer complex sheet Download PDFInfo
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- KR101661067B1 KR101661067B1 KR1020150099521A KR20150099521A KR101661067B1 KR 101661067 B1 KR101661067 B1 KR 101661067B1 KR 1020150099521 A KR1020150099521 A KR 1020150099521A KR 20150099521 A KR20150099521 A KR 20150099521A KR 101661067 B1 KR101661067 B1 KR 101661067B1
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- metal powder
- epoxy resin
- metal
- slurry
- particle size
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- 239000002184 metal Substances 0.000 title claims abstract description 115
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 115
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 229920000642 polymer Polymers 0.000 title claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 92
- 239000002245 particle Substances 0.000 claims abstract description 56
- 239000002002 slurry Substances 0.000 claims abstract description 49
- 238000000034 method Methods 0.000 claims abstract description 43
- 239000002131 composite material Substances 0.000 claims abstract description 35
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000007787 solid Substances 0.000 claims abstract description 29
- 239000000203 mixture Substances 0.000 claims abstract description 21
- 239000002904 solvent Substances 0.000 claims abstract description 21
- 229920005989 resin Polymers 0.000 claims abstract description 16
- 239000011347 resin Substances 0.000 claims abstract description 16
- 229910017082 Fe-Si Inorganic materials 0.000 claims abstract description 13
- 229910017133 Fe—Si Inorganic materials 0.000 claims abstract description 13
- 229910019819 Cr—Si Inorganic materials 0.000 claims abstract description 5
- 229910018098 Ni-Si Inorganic materials 0.000 claims abstract description 4
- 229910018529 Ni—Si Inorganic materials 0.000 claims abstract description 4
- 229910018125 Al-Si Inorganic materials 0.000 claims abstract 2
- 229910018520 Al—Si Inorganic materials 0.000 claims abstract 2
- 239000003822 epoxy resin Substances 0.000 claims description 37
- 229920000647 polyepoxide Polymers 0.000 claims description 37
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 claims description 33
- 239000002270 dispersing agent Substances 0.000 claims description 15
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 claims description 4
- HECLRDQVFMWTQS-UHFFFAOYSA-N Dicyclopentadiene Chemical compound C1C2C3CC=CC3C1C=C2 HECLRDQVFMWTQS-UHFFFAOYSA-N 0.000 claims description 4
- 229920001971 elastomer Polymers 0.000 claims description 4
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 claims description 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 239000000539 dimer Substances 0.000 claims description 3
- 239000004843 novolac epoxy resin Substances 0.000 claims description 3
- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 claims description 3
- 239000008096 xylene Substances 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims 1
- 230000000996 additive effect Effects 0.000 claims 1
- 238000005266 casting Methods 0.000 claims 1
- 229910052742 iron Inorganic materials 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 23
- 238000002156 mixing Methods 0.000 abstract description 10
- 238000010345 tape casting Methods 0.000 abstract description 8
- 238000010030 laminating Methods 0.000 abstract 1
- 239000006185 dispersion Substances 0.000 description 12
- 239000011863 silicon-based powder Substances 0.000 description 9
- 239000000919 ceramic Substances 0.000 description 6
- 239000011812 mixed powder Substances 0.000 description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 238000000635 electron micrograph Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010884 ion-beam technique Methods 0.000 description 1
- 229910001004 magnetic alloy Inorganic materials 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Images
Classifications
-
- 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
- H01F41/04—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 for manufacturing coils
- H01F41/041—Printed circuit coils
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/0006—Printed inductances
- H01F17/0013—Printed inductances with stacked layers
Abstract
Description
The present invention relates to a method for producing a metal polymer composite sheet, and more particularly, to a method for producing a metal polymer composite sheet having increased dispersibility in a slurry for producing the composite sheet.
In recent years, a power inductor widely used for a power conversion circuit such as a power circuit or a DC-DC converter is configured as a laminated structure in which a plurality of ferrites or a plurality of low dielectric constant ceramic sheets are laminated rather than a winding-type structure in which coils are wound around a ferrite core. This is because, in the case of a wire-wound structure, the high-frequency characteristics deteriorate due to the stray capacitance between the coils.
The general structure of such a stacked type power inductor can be schematically shown in Fig. That is, the
As the composition of the ceramic sheet, ferrite, a metal material and the like can be mentioned. However, ferrite has a low saturation magnetization value and poor current characteristics, and a metal material has a problem of large eddy current and hysteresis loss at a high frequency band.
Accordingly, in recent years, ceramic sheets for inductors are produced as a composite sheet composed of a composition in which metallic powder is mixed with glass or resin to maintain insulation between metal powder particles. The metal powder thus coated with the insulating layer is generally mixed with an epoxy resin as a binder to form a composite sheet.
For example, Japanese Patent No. 4881192 (published on Mar. 22, 2012) discloses a method of manufacturing electronic components, in which Bi 2 O 3 is coated on Fe-Cr-Si-based metal magnetic alloy powder particles, Disclosed is a technique for preventing an insulation failure due to heat or a defective breakdown voltage.
Particularly, recently, inductors are required to have a large current of rated current, so that one or two kinds of soft magnetic metal powders having different particle sizes are mixed to improve magnetic properties such as magnetic permeability and inductance and to increase the filling rate of metal powder A composite sheet is being developed.
As a related example, in the "laminated inductor" of Japanese Patent No. 5048155 (published on Oct. 17, 2012) and "laminated inductor" of Japanese Patent No. 5048156 (published on Oct. 17, Si based soft magnetic metal powder is used to produce a composite sheet.
On the other hand, in order to produce such a composite sheet, a tape casting process for forming a sheet must be performed in a state that the metal powder is well dispersed. In this process, a dispersion slurry having a high concentration should be produced while maintaining a high viscosity, and thus it is possible to produce a composite sheet containing a large amount of solid components and having excellent magnetic properties.
However, when the slurry is prepared by using the metal powder mixed with the large particles and the small particles as described above, the powder having a large particle size easily precipitates, thereby increasing the viscosity of the slurry and adversely affecting the dispersion of the metal particles , And it is impossible to disperse a higher solid content depending on conditions.
Therefore, there is a need for a manufacturing method which improves the dispersibility of the solid metal powder in the production of the composite sheet as described above.
Accordingly, the present invention provides a method for producing a metal polymer composite sheet having increased dispersibility in a slurry for producing a composite sheet.
In order to accomplish the above object, the present invention provides a method for producing a sheet of metal polymer composite, which comprises preparing a slurry in which first and second metal powders having different particle sizes are dispersed, Dispersing a second metal powder having a small particle size first in a solvent and mixing with a resin solution to form a mixture and then dispersing a first metal powder having a relatively larger particle size in the mixture to prepare the slurry; And tape casting and curing the slurry to produce the composite sheet.
At this time, the particle size of the first metal powder may be 10 to 15 탆, and the particle size of the second metal powder may be 3 to 4 탆.
The composition of the first metal powder may be at least one selected from the group consisting of Fe-Si, Fe-Ni-Si, Fe-Cr-Si and Fe- And may be carbonyl iron powder (CIP).
The first metal powder and the second metal powder may be coated with an insulating layer in order to maintain the insulating property between the respective powder particles, and the composition of the insulating layer may be Fe 3 (PO 4 ), Al 3 (PO 4 ) Bi 2 O 3, and the like.
In addition, the content of the metal solid content dispersed in the slurry may be adjusted to 50 to 75 vol% based on the total amount of the slurry.
The content of the first metal powder and the second metal powder may be adjusted to 1: 1.
In the step of preparing the slurry, a dispersant may be added when the first metal powder and the second metal powder are dispersed. The dispersant may be at least one selected from the group consisting of BYK-111, BYK-103 and a silane coupling agent And the addition amount of the dispersant may be 0.2 to 1.5 wt% based on the total amount of the first metal powder and the second metal powder when dispersed.
The solvent may be at least one selected from the group consisting of methyl ethyl ketone (MEK), ethanol, IPA, toluene, and xylene.
The resin may be an epoxy resin, for example, a novolac epoxy resin, a phenoxy type epoxy resin, a BPA type epoxy resin, a BPF type epoxy resin, (BPF) epoxy resin, hydrogenated BPA epoxy resin, dimer acid modified epoxy resin, urethane modified epoxy resin, rubber modified epoxy resin, an epoxy resin, and a DCPD type epoxy resin.
The curing may be carried out at a temperature of 120 to 200 DEG C for 10 minutes to 1 hour.
According to the present invention, a metal powder having a relatively smaller particle size range is first dispersed in a solvent and mixed with a resin, and then the remaining metal powder is mixed with a resin, using two different metal powders having different particle size ranges, When the slurry is prepared by dispersing, the viscosity of the slurry is lowered and the dispersibility of the metal solid component is remarkably improved. Thus, the content of the metal solid content can be greatly increased under the same conditions, so that the magnetic properties of the final inductor produced by the composite sheet produced by tape casting of the slurry can be greatly improved.
1 is a cross-sectional view of a general schematic structure of a stacked type power inductor.
FIGS. 2A and 2B are electron micrographs of two kinds of metal powder particles coated with an insulating layer used as a composition of a composite sheet for an inductor in general, wherein FIG. 2A is of Fe-Si powder and FIG. 2B is carbon of iron Powder (CIP).
FIG. 3 is a schematic view illustrating a process for producing a slurry by dispersing a mixed powder obtained by mixing two metal powders at a ratio of about 1: 1 with a dispersant in a solvent.
4A to 4E are photographs showing dispersions in the slurry prepared according to the process of FIG. 3, wherein the content of each metal solid content is 50 vol% in FIG. 4A, 55 vol% in FIG. 4B, 60 vol% 4d is 65 vol%, and Fig. 4e is 70 vol%.
5 is a schematic diagram illustrating a process in which the remaining metal powder is dispersed after the metal powder having a relatively smaller particle size range is first dispersed in the solvent and mixed with the resin according to the present invention.
6A to 6E are dispersion results of the embodiment according to the process of the present invention shown in FIG. 5, wherein the final metal solid content in the prepared slurry is 50 vol% in FIG. 6A, 55 vol% in FIG. 6B, 60vol%, Figure 6d is 65vol%, and Figure 6e is 70vol%.
Fig. 7 is a graph showing the final solid metal content in slurries prepared using Fe-Si powders having particle sizes of 10-15 [mu] m and carbonyl iron powder (CIP) 3-4 [mu] m, 5 is a graph showing the viscosity of the slurry prepared according to the process of FIG. 5 according to the content of the dispersant.
FIG. 8 is an electron micrograph of a cross section of a composite sheet produced by tape-casting and then curing the slurry of FIG. 6E containing 70 vol% of metal solids in accordance with the process of the present invention shown in FIG.
BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in detail with reference to the accompanying drawings.
As described above, when a mixed powder obtained by mixing metallic powders having different particle size ranges in a general slurry manufacturing process for producing a composite sheet for inductor is dispersed in a solvent, the viscosity of the slurry is increased, Which in turn significantly degrades the magnetic properties of the inductor being fabricated.
2A and 2B are electron micrographs of two kinds of metal powder particles coated with an insulating layer prepared by mixing as a composition of the composite sheet for inductor, wherein FIG. 2A is of Fe-Si powder and FIG. 2B is carbon of iron Powder (CIP: Carbonyl Iron Powder). The insulating layer is Fe 3 (PO 4 ) and / or Al 3 (PO 4 ) composition.
In the case of this Fe-Si powder, the particle size is approximately 10 to 15 μm and the density is 7.78 g / cm 3. In the case of carbonyl iron powder, the particle size is approximately 3 to 4 μm and the density is 7.35 g / cm 3. Therefore, in these metal powders, the main component is iron (Fe), which is very dense, and particularly in the case of Fe-Si powder, precipitation easily occurs. Therefore, when the slurry for producing a composite sheet is prepared by mixing these metal powders, The dispersion efficiency of the powder naturally deteriorates.
Fig. 3 is a schematic view for explaining a process for producing a slurry by mixing and dispersing Fe-Si powder and carbonyl iron powder (CIP) as two types of metal powders having different particle sizes.
4A to 4E illustrate that after mixing the two metal powders in a ratio of about 1: 1 (by vol% or wt%) according to the manufacturing process of FIG. 3, the mixed powder is mixed with a small amount of a commercial dispersing agent in a solvent Methyl ethyl ketone (MEK) solution to prepare a slurry. The content of the metal solid in the slurry is 50 vol%, 4 vol%, 60 vol%, 4 vol%, and 70 vol%, respectively.
4A to 4E, it can be seen that the dispersion state of the mixed powder is significantly different according to the volume ratio of the metal powder to the total amount. It can be seen that the dispersed slurry can not be obtained when the metal solid content is up to 60 vol%, but when it is from 65 to 70 vol%.
Further, it is confirmed that the powder particles are uniformly and well dispersed in the solvent as the slurry is well formed and the viscosity is low. The lower the viscosity under the same conditions, the better the process convenience as well as the advantage of good dispersion characteristics since the composite sheet can be produced as a condition containing a larger amount of solids in the actual process.
According to this observation, the present invention provides a slurry for a composite sheet of a metal-resin by dispersing two magnetic metal powders, which are different kinds of solid particles having different particle size ranges, in a resin solution, The present inventors propose a manufacturing method that dramatically improves the dispersibility of a solid metal powder by using scientific facts that are difficult to disperse as the particle size becomes smaller and disperse more easily as the particle size becomes larger. As the content of the metal solid increases due to the increased dispersibility, the magnetic properties of the finally produced inductor can be greatly improved.
That is, according to the present invention, two metal powders having different particle size ranges are used, and instead of being mixed and dispersed in a solvent simultaneously, the two metal powders are separately dispersed in a solvent in a separate process. Specifically, in the present invention, after the metal powder having a relatively smaller particle size range is first dispersed in the solvent and mixed with the resin, the remaining metal powder is dispersed later. 5 is a schematic diagram for explaining this.
3 and 4A to 4E, the metal powder having a small particle size dispersed first has a solid fraction ratio with respect to the amount of the solvent as compared with the case of dispersing the mixed powder in which the two metal powders having different particle size ranges are first dispersed The dispersion is reduced by half (1/2), which makes dispersion very favorable.
Moreover, metal powders of large particle size are relatively easier to disperse in nature, but additionally, because the metal powders having a smaller particle size range as described above are first dispersed in the solvent and dispersed after mixing with the resin, Since the amount of the solvent relative to the metal powder having a large particle size of the solvent and the resin is relatively increased, the ease of dispersion is remarkably increased.
According to the present invention, the particle sizes of the two kinds of metal powders having different particle size ranges can be in the range of 10 to 15 μm and in the range of 3 to 4 μm, respectively. The metal powder having a particle size in the range of 10 to 15 占 퐉 may have a composition of at least one of Fe-Si, Fe-Ni-Si, Fe-Cr-Si and Fe-Al- Do. In addition, the metal powder having a particle size in the range of 3 to 4 mu m can be carbonyl iron powder (CIP). The final dispersed metal solid content in the prepared slurry is preferably 50 to 75 vol% based on the total amount. In addition, the two kinds of metal powders may be coated with an insulating layer selected from one or more of Fe 3 (PO 4 ), Al 3 (PO 4 ) and Bi 2 O 3 compositions so that the intergranular insulation can be maintained. The content of each of the two metal powders may be about 1: 1 (based on vol% or wt%).
Further, according to the present invention, a small amount of dispersant can be added when the metal powder is dispersed. One or more of the dispersing agents BYK-111, BYK-103 and silane coupling agents may be used as the dispersing agent, and the content thereof is such that the total amount of the metal powder dispersed (that is, the metal powder of smaller particle size is dispersed in the solvent , And the total amount of metal powder of the larger particle size thereafter when the metal powder is added and dispersed) is preferably 0.2 to 1.5 wt%.
According to the present invention, methyl ethyl ketone (MEK), ethanol, IPA, toluene or xylene can be used as the solvent, but methyl ethyl ketone (MEK) is preferable.
According to the present invention, the resin may be an epoxy resin, for example, a novolac epoxy resin, a phenoxy type epoxy resin, a BPA type epoxy resin ), BPF type epoxy resin, hydrogenated BPA epoxy resin, dimer acid modified epoxy resin, urethane modified epoxy resin, rubber modified epoxy resin, A rubber modified epoxy resin, and a DCPD type epoxy resin.
Further, according to the present invention, the slurry produced as described above is subjected to tape casting and then the epoxy resin contained therein is cured to produce a composite sheet. Such curing can be achieved in the temperature range of approximately 120 to 200 DEG C in the range of 10 minutes to 1 hour. Also, as described above in connection with FIG. 1, such composite sheets may be made in plurality and laminated as a stack to ultimately form the
6A to 6E are dispersion results of the embodiment according to the process of the present invention shown in Fig. 5, wherein the final metal solid content in the prepared slurry is 50 vol% in Fig. 6A, 55 vol% in Fig. 6B, 60vol%, Figure 6d is 65vol%, and Figure 6e is 70vol%. Specifically, carbonyl iron powder (CIP) having a particle size of 3 to 4 占 퐉 was dispersed in solvent MEK at 300 rpm for 1 hour together with 0.4 to 0.8 wt% of BYK-111 based on the total amount, After mixing with the resin, Fe-Si powders having a particle size of 10 to 15 mu m were mixed and dispersed at 200 rpm for 2 hours. At this time, the contents of carbonyl iron powder (CIP) and Fe-Si powder were set to approximately 1: 1.
6a to 6e show the dispersed state according to the change in the content of the final metal solid in the prepared slurry, and particularly FIG. 6e showing the maximum content of the solid metal content. Even when the solid content is increased to 70 vol% It can be confirmed that it is mixed. This is a marked improvement over the very inferior dispersion (see FIG. 4e) of the slurry having a solids content of 70 vol% when made according to the process of FIG.
7 is a graph showing the final solid metal content of 60 vol% in a slurry prepared using Fe-Si powder having a particle size of 10 to 15 占 퐉 and carbonyl iron powder (CIP) having 3 to 4 占 퐉, 3 and the slurry prepared according to the process of FIG. 5, and comparing the viscosity according to the dispersant amounts. The remaining composition and process conditions are the same as those of Figs. 4C and 6C except for the dispersant content varying in the process of Figs. 3 and 5, respectively.
Referring to FIG. 7, the viscosity tends to decrease as the content of the dispersant increases. In particular, in the case of the slurry according to the process of FIG. 5, that is, the process according to the present invention, it is observed that the viscosity is excellent and the viscosity is extremely low, ie, less than half. Thus, it can be seen that according to the process of Fig. 5, i.e. the process according to the invention, a viscosity capable of producing a composite sheet containing up to about 70 vol% of metal solids content can be obtained.
8 is a cross-sectional view of a composite sheet prepared by tape-casting the slurry of FIG. 6E containing 70 vol% of metal solid content and curing an epoxy resin contained therein according to the process of the present invention shown in FIG. 5, ion beam). FIG.
8, it is observed that a metal powder of a large particle, a metal powder of a small particle and an epoxy resin form a composite sheet which is relatively uniformly mixed.
The various characteristics of the preferred embodiments of the present invention described above may vary somewhat within a conventional error range depending on the powder characteristics such as the average particle size, distribution and specific surface area of the composition powder, and the purity of the raw material, Is quite natural for those of ordinary skill in the art.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. , Additions and the like are to be regarded as belonging to the claims.
Claims (17)
A second metal powder having a relatively smaller particle size is first dispersed in a solvent and mixed with a resin solution to prepare a slurry in which a first metal powder and a second metal powder having different particle sizes are dispersed, Dispersing a first metal powder having a relatively larger particle size in the mixture to form the slurry after forming the mixture;
And casting and curing the slurry to produce the composite sheet. ≪ RTI ID = 0.0 > 21. < / RTI >
Wherein the first metal powder has a particle size of 10 to 15 占 퐉.
Wherein the second metal powder has a particle size of 3 to 4 占 퐉.
Wherein the composition of the first metal powder is at least one selected from the group consisting of Fe-Si, Fe-Ni-Si, Fe-Cr-Si, and Fe-Al-Si.
Wherein the composition of the second metal powder is carbonyl iron powder (CIP).
Wherein the first metal powder and the second metal powder are coated with an insulating layer.
Wherein the composition of the insulating layer is at least one selected from the group consisting of Fe 3 (PO 4 ), Al 3 (PO 4 ), and Bi 2 O 3 .
Wherein the content of the metal solid dispersed in the slurry is 50 to 75 vol% based on the total amount of the slurry.
Wherein the content of the first metal powder and the second metal powder is 1: 1.
Wherein the dispersing agent is added when the first metal powder and the second metal powder are dispersed in the step of preparing the slurry.
Wherein the dispersant is at least one selected from the group consisting of BYK-111, BYK-103 and a silane coupling agent.
Wherein the additive amount of the dispersant is 0.2 to 1.5 wt% based on the total amount of the first metal powder and the second metal powder when the first metal powder and the second metal powder are dispersed, respectively.
Wherein the solvent is at least one selected from the group consisting of methyl ethyl ketone (MEK), ethanol, IPA, toluene, and xylene.
Wherein the resin is an epoxy resin.
The epoxy resin may be a novolac epoxy resin, a phenoxy type epoxy resin, a BPA type epoxy resin, a BPF type epoxy resin, a hydrogenated BPA epoxy resin, Hydrogenated BPA epoxy resin, dimer acid modified epoxy resin, urethane modified epoxy resin, rubber modified epoxy resin and DCPD type epoxy resin (DCPD type epoxy resin). < RTI ID = 0.0 > 11. < / RTI >
Wherein the curing is performed in a temperature range of 120 to 200 ° C.
Wherein the curing is performed for 10 minutes to 1 hour.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102258927B1 (en) * | 2020-04-01 | 2021-05-31 | 한국세라믹기술원 | Manufacturing method of magnetic material |
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| JP2002043164A (en) * | 2000-07-21 | 2002-02-08 | Murata Mfg Co Ltd | Laminated ceramic electronic component and method for manufacturing the same |
| KR20100136508A (en) * | 2008-04-15 | 2010-12-28 | 닛토덴코 가부시키가이샤 | Permanent magnet and process for producing permanent magnet |
| KR20140081572A (en) * | 2012-12-21 | 2014-07-01 | 삼성전기주식회사 | Magnetic composite sheet and Electromagnetic induction module |
| KR101458830B1 (en) * | 2013-06-14 | 2014-11-07 | (주)창성 | A slurry with micro powder and manufacturing method of it and manufacturing method of magnetic sheet using the slurry and a magnetic sheet thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002043164A (en) * | 2000-07-21 | 2002-02-08 | Murata Mfg Co Ltd | Laminated ceramic electronic component and method for manufacturing the same |
| KR20100136508A (en) * | 2008-04-15 | 2010-12-28 | 닛토덴코 가부시키가이샤 | Permanent magnet and process for producing permanent magnet |
| KR20140081572A (en) * | 2012-12-21 | 2014-07-01 | 삼성전기주식회사 | Magnetic composite sheet and Electromagnetic induction module |
| KR101458830B1 (en) * | 2013-06-14 | 2014-11-07 | (주)창성 | A slurry with micro powder and manufacturing method of it and manufacturing method of magnetic sheet using the slurry and a magnetic sheet thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR102258927B1 (en) * | 2020-04-01 | 2021-05-31 | 한국세라믹기술원 | Manufacturing method of magnetic material |
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