KR101319646B1 - NiZnCu ferrite composition, and multi layered chip materials comprising the same - Google Patents
NiZnCu ferrite composition, and multi layered chip materials comprising the same Download PDFInfo
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- KR101319646B1 KR101319646B1 KR20100106814A KR20100106814A KR101319646B1 KR 101319646 B1 KR101319646 B1 KR 101319646B1 KR 20100106814 A KR20100106814 A KR 20100106814A KR 20100106814 A KR20100106814 A KR 20100106814A KR 101319646 B1 KR101319646 B1 KR 101319646B1
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Abstract
The present invention relates to NiZnCu-based ferrites comprising rare earth metals and stacked chip components made therefrom.
When using the NiZnCu-based ferrite composition containing the rare earth metal according to the present invention, the permeability, the quality factor Q value, the saturation magnetization value, and the density value can be increased. This improvement in physical properties has the effect of improving the DC-bias characteristics of various chip bead products. Therefore, the ferrite composition according to the present invention can be applied to various stacked chip components.
Description
The present invention relates to a NiZnCu-based ferrite composition comprising a rare earth metal, and a laminated chip component using the same, and more particularly, to a NiZnCu-based ferrite composition capable of improving DC-bias characteristics, and a stacked chip component using the same.
In general, nickel-zinc ferrite, nigel-zinc-copper ferrite, and the like are mainly used as magnetic materials of magnetic ceramic components such as stacked chip power inductors. In order to increase the sinterability of nickel-zinc ferrite, it is mainly manufactured by the ternary composition of nickel-zinc-copper ferrite by adding Cu, but it is substituted with + trivalent ions such as Al and Cr instead of Fe, or Sn, Ti It may also be prepared by substituting ions such as +4. In addition, instead of Ni, Zn, and Cu, +2 valent ions such as Mn, Co, and Mg may be substituted. That is, the properties are improved by substituting elements having similar ionic radii and elements having the same ionic value.
Among ferrite materials, NiZnCu Ferrite is generally used in stacked chip inductors, stacked chip beads, and power inductors, and the NiZnCu Ferrite is improved by changing the content of NiO, ZnO, CuO, and Fe 2 O 3 . Such a method of manufacturing NiZnCu Ferrite is as shown in FIG. 1, which will be described below with reference to this.
Starting materials (materials) are mixed by dry or wet method, and distilled water is generally used when mixing by wet method. When the ingredients are mixed, they are dried and disintegrated. The pulverized powder is subjected to calcination. At this time, the ferrite phase of the spinel structure is synthesized and calcined at a temperature of about 700 to 800 ° C. to have congruity. After the calcination process, milling reduces the size to the desired particle size, which is also the wet method. After milling, the powder is dried and pulverized to form a ferrite powder, which is used to manufacture a laminated chip component.
To manufacture a stacked chip device using the ferrite powder manufactured through the above steps, the stacked chip inductor, the stacked chip bead, and the power inductor all use Ag as an internal electrode, and the melting point of Ag is 961 ° C. In order to achieve this, the ferrite composition is fired at 961 ° C or lower.
When the sintering temperature is 900 ° C, the sintered density at this time should be at least about 4.8 g / cm 3 or more. The larger the quality factor Q is, the better, because a larger Q value means less loss.
DC-bias characteristics are very important for stacked chip power inductors manufactured using NiZnCu ferrite as a main raw material. In order to improve these DC-bias characteristics, the saturation magnetization (Ms) of the magnetic material must be large.
In general, the spinel ferrite is composed of tetrahedral A-site and octahedral B-site, and the spin of A-site has a spin alignment in the downward direction and the spin of the B-site has an up spin. . In addition, 4 m B of A-site and 8 m B of B-site may have the theoretical saturation magnetization value of 8-4 = 4 m B. When the element of A-site is replaced with a nonmagnetic element, the saturation magnetization value is obtained. Can be increased.
Currently, NiZnCu ferrite consisting of (NiZnCu) O (Fe 2 O 3 ) is used to control the saturation magnetization by changing Zn occupying A-site. In order to develop ferrite materials with higher saturation magnetization values, it is necessary to substitute more non-magnetic elements occupying A-site.
In the present invention to solve the problems of the prior art as described above, to provide a NiZnCu-based ferrite composition that can increase the saturation magnetization (Ms) of the magnetic material to improve the DC-bias characteristics of the laminated chip component Its purpose is to.
Further, another object of the present invention is to provide a laminated chip component manufactured from the NiZnCu-based ferrite composition.
Further, another object of the present invention is to provide a toroidal core prepared from the NiZnCu-based ferrite composition.
NiZnCu-based ferrite composition of the present invention for solving the above problems is to include a rare earth metal.
According to an embodiment of the present invention, the rare earth metal may include scandue (Sc), yttrium (Y), lanthanum (La), cerium (Ce), praseodymium (Pr), niodymium (Nd), samarium (Sm), Selected from the group consisting of europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), tolium (Tm), ytterbium (Yb) and lutetium (Lu) It may be one or more.
The rare earth metal is preferably included in 0.01 to 2.0% by weight of the total composition.
The composition is converted into oxides each content of Fe 2 O 3 47.0-49.0 mol%, NiO 16.0-24.0 mol%, ZnO 18.0-25.0 mol%, CuO 7.0-13.0 mol%, and rare earth metal oxide 0.005-0.6 mol% It may be included as.
Each metal constituting the composition is selected from the group consisting of oxides, hydroxides, nitrides, acetates, alkoxides, chlorides, and carbonates. It may be included as one or more salts, and is not particularly limited.
In addition, according to an embodiment of the present invention, the ferrite composition may be sintered at a temperature of 880 ~ 920 ℃.
In addition, the present invention can provide a chip component using a NiZnCu-based ferrite composition containing a rare earth metal in order to solve the other problems.
In addition, the present invention can provide a toroidal core using a NiZnCu-based ferrite composition containing a rare earth metal in order to solve the above further another problem.
According to an embodiment of the present invention, when using a ferrite composition containing a rare earth metal in the NiZnCu-based ferrite composition, the permeability, the quality factor Q value, the saturation magnetization value, and the density value may be increased. This improvement in physical properties has the effect of improving the DC-bias characteristics of various chip components.
Therefore, the ferrite composition according to the present invention can be applied to various stacked chip components.
1 illustrates a process of synthesizing ferrite by a conventional solid phase method,
2 is a graph showing the change in permeability according to the addition of CeO 2 , a rare earth metal.
Hereinafter, the present invention will be described in more detail.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a," "an," and "the" include singular forms unless the context clearly dictates otherwise. Also, " comprise "and / or" comprising "when used herein should be interpreted as specifying the presence of stated shapes, numbers, steps, operations, elements, elements, and / And does not preclude the presence or addition of one or more other features, integers, operations, elements, elements, and / or groups.
The ferrite composition according to the present invention is NiZnCu-based, and further comprises a rare earth metal to improve the properties of the super-permeability, quality factor, saturation magnetization and the like can improve the DC-bias characteristics.
Since the rare earth metal has electrons in the outermost 4f orbit, it combines with the transition metal to cause 3d-4f interaction, contributing to orbital momentum and spin angle momentum simultaneously. In the ferrite that is not substituted with the rare earth metal, the angular momentum is quenched, and only the spin value of the outermost 3d orbit is calculated.
It is generally known that in the case of rare earth metals, it is difficult to produce a single phase ferrite by substituting Fe instead. Because the ion radius of Fe 3 + ions is 0.64 Å, the ionic radius of rare earth metals is La 3 + (0.89 Å), Ce 3 + (1.03 Å), Nd 3 + (1.00 Å), Sm 3 + (0.96 Å a), Eu 3 + (0.95 Å ), Gd 3 + (0.94 Å), Dy 3 + (0.91 Å), Ho 3 + (0.89 Å). Therefore, because of the difference in the ion radius it is not easy to replace the secondary phase can be generated.
Therefore, in the following Fe 3 + substitution instead of a rare earth metal, it is necessary to optimize the amount, by substitution with an optimized content can produce ferrite with no secondary phase. Of course, in order to obtain a single phase ferrite, a smaller amount of substitution may be required depending on the type of rare earth elements.
Therefore, the rare earth metal included in the ferrite composition of the present invention is preferably included in 0.01 to 2.0% by weight of the total composition. When added in excess of the above range, there is a problem that the secondary phase hematite is generated, which is not preferable.
In addition, the content may be included in the NiZnCu-based ferrite composition, to fix the content of Ni, Zn, C, up to 0.6 mol% of mol% of Fe when the rare earth metal is substituted for Fe. This means that the amount of ferrite that is not produced in the secondary phase is less than 0.6 mol%, and when the content of the rare earth metal exceeds the above range, the secondary phase, a-Fe 2 O 3 (Hematite, hematite) phase is generated. It is undesirable because it will degrade the properties.
Rare earth metals that may be included in the present invention are scandue (Sc), yttrium (Y), lanthanum (La), cerium (Ce), praseodymium (Pr), niodymium (Nd), samarium (Sm), europium (Eu) ), Gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), tolium (Tm), ytterbium (Yb) and lutetium (Lu) will be.
According to an embodiment of the present invention, each content in terms of NiZnCu-based ferrite composition oxide containing a rare earth metal is Fe 2 O 3 47.0-49.0 mol%, NiO 16.0-24.0 mol%, ZnO 18.0-25.0 mol%, CuO 7.0 It is preferably included in the range of -13.0 mol%, and 0.005-0.6 mol% of rare earth metals.
In addition, in the preparation of the NiZnCu-based ferrite composition according to the present invention, each metal constituting the composition is oxide, hydroxide, nitride, acetate, alkoxide, chloride And, and may be included as one or more salts selected from the group consisting of carbonate, and is not particularly limited.
Hereinafter, a method of preparing the ferrite composition to which the rare earth metal of the present invention is added will be described in detail.
First, prepare ferrite raw material. As ferrite raw materials, metal salts of Fe, Ni, Zn, Cu, and rare earth metals are prepared, respectively, and weighed. The metal salts used here are from the group consisting of oxides, hydroxides, nitrides, acetates, alkoxides, chlorides, and carbonates as described above. It will not specifically limit, if it is 1 or more types selected.
The material is then liquid milled and dried in a drying oven. The dry powder is pulverized and then calcined at a temperature of 700 to 800 ° C. The calcination temperature is set to the temperature at which the ferrite single phase is produced without generating the hematite (a-Fe 2 O 3 ) phase as the secondary phase. The calcined powder is ground by milling to produce the final ferrite powder.
The ferrite powder prepared as described above has a content of Fe 2 O 3 47.0-49.0 mol%, NiO 16.0-24.0 mol%, ZnO 18.0-25.0 mol%, CuO 7.0-13.0 mol%, and rare earth metal 0.005 ~ It is preferably included in 0.6 mol%. A rare earth substituted nickel-zinc-copper ferrite powder thus obtained is obtained.
Ferrite powder according to the present invention can be prepared by a known solid-phase method, a liquid phase method, it is not particularly limited to the production method.
Meanwhile, the present invention manufactures a ferrite sheet using a ferrite composition containing the ferrite powder, and after printing the internal electrode through a punching, pressing and cutting process, and a firing process, a low-temperature fired magnetic ceramic component such as a chip power inductor It will be prepared.
In addition, it can be used as a toroidal core inductor material as well as a low-temperature fired magnetic ceramic component such as the chip inductor.
In the case of manufacturing the components as described above, sintering may be performed at a temperature between 850 ° C. and 920 ° C., preferably 880 ° C. and 920 ° C., to provide a stacked chip bead material, a chip inductor, and a toroidal core.
The embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, and the following examples can be modified in various other forms, and the scope of the present invention is It is not limited to an Example. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the inventive concept to those skilled in the art.
Example 1-3
Oxides of NiZnCu ferrite metals are mixed as starting materials, and after the mixing is completed, drying is carried out, followed by drying and pulverization, followed by calcination. The calcining is set at the temperature at which the spinel ferrite phase is synthesized at temperatures between 700 and 800 ° C. After calcination, milling, drying and pulverization gave ferrite powder.
The ferrite composition has a fixed content of 18 mol% NiO, 22 mol% ZnO, 11 mol% CuO in terms of oxide, and 0.2, 0.4, 0.6 mol% of CeO 2 as a rare earth metal with respect to 49 mol% Fe 2 O 3 . Substituted by
Comparative Example 1-2
The ferrite powder is prepared in the same manner as in the above embodiment, except that CeO 2 , which is a rare earth metal, is not added to the ferrite composition, or the ferrite powder is manufactured in an excess amount (0.8 mol%) to deviate from the scope of the present invention. Got it.
Experimental Example
The ferrite sheet is manufactured by using a ferrite composition comprising the ferrite powder prepared in Examples and Comparative Examples, and after the internal electrode is printed, a process of punching, pressing, and cutting is performed, and a firing process is performed at a temperature between 880 to 920 ° C. The chip power inductor was manufactured.
In addition, the permeability and the Q value was measured at 1 Mhz after winding the wire 10 times in the toroidal core, and the saturation magnetization value was measured after applying an external magnetic field of 5000 Oe, and the results are shown in Table 1 below.
(℃)
(g / cc)
(%)
(Ms, emu / g)
(Hc, Oe)
(CeO 2 0.2mol%)
900
(CeO 2 0.4 mol%)
(CeO 2 0.6 mol%)
(CeO 2 0mol%)
(CeO 2 0.8 mol%)
Compared with Comparative Example 1, which is a conventional NiZnCu ferrite composition containing no rare earth metal, as shown in the results of Table 1, a chip prepared from the NiZnCu ferrite compositions of Examples 1 to 3 including CeO 2 , which is a rare earth metal. It can be seen that most of the characteristics such as the saturation magnetization value, permeability, quality factor, density, and coercivity of the part are improved.
However, in the case of Comparative Example 2 in which the substitution amount of the rare earth metal is outside the scope of the present invention, it was found that most of the physical properties were rather inferior. (See Fig. 2)
Therefore, when the rare earth metal is included in the optimum NiZnCu ferrite composition as an optimal content as in the present invention, it can have a large saturation magnetization value and consequently improve the DC-bias property, and thus can be used in various chip components.
Claims (8)
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0636921A (en) * | 1992-07-16 | 1994-02-10 | Tdk Corp | Ferrite magnetic paint for multilayer ceramic component use |
| JPH0776844B2 (en) * | 1990-02-27 | 1995-08-16 | 株式会社日本製鋼所 | Green magnetic powder for electrophotography and method for producing the same |
| JPH10183028A (en) * | 1996-12-24 | 1998-07-07 | Mitsubishi Materials Corp | Production of composite paint and production of lc composite part |
| JP7076844B2 (en) * | 2018-07-26 | 2022-05-30 | サン電子工業株式会社 | Electrolytic capacitor |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0776844B2 (en) * | 1990-02-27 | 1995-08-16 | 株式会社日本製鋼所 | Green magnetic powder for electrophotography and method for producing the same |
| JPH0636921A (en) * | 1992-07-16 | 1994-02-10 | Tdk Corp | Ferrite magnetic paint for multilayer ceramic component use |
| JPH10183028A (en) * | 1996-12-24 | 1998-07-07 | Mitsubishi Materials Corp | Production of composite paint and production of lc composite part |
| JP7076844B2 (en) * | 2018-07-26 | 2022-05-30 | サン電子工業株式会社 | Electrolytic capacitor |
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