TW499399B - Ferrite with high-permittivity and high dielectric coefficient and method for producing the same - Google Patents

Abstract

A ferrite with a high-permittivity and a high dielectric coefficient is produced by preparing and sintering a powder containing, for example, TiO2, Fe2O3, and one or more oxides of Mn, Ni, Cu or Zn according to a composition of Tix(MFe2O4+2x/y)y, in which x+y=1, 0 < x < 1, and M is one of Mn, Ni, Cu or Zn or a mixture thereof, and the ratio of x and y can be adjusted according to actual need, thereby obtaining various binary ferrite compositions with different permittivities and dielectric constants; the composition can be used as a magnetic conductive material and a dielectric material simultaneously in the production of an electronic component, thereby avoiding the defects from co-sintering two different materials.

Description

499399 V. Description of the invention (l) [Application field of the invention] This matter is about a Taumman material with high permeability and high permittivity, especially a kind of high permeability and high permittivity. Ferrite and its manufacturing method. : BACKGROUND OF THE INVENTION Generally, § dielectric materials and ferrite materials are two materials with different properties and different functions. The ferrite system is a ferromagnetic material, and its dielectric constant (dielectirc constant) is generally less than 20 according to the literature. Dielectric materials, such as those used in capacitors, are not magnetic ::: t has a magnetic permeability. Therefore, when manufacturing a multilayer component, if the product ::: ϋ = high dielectric constant and high conductivity Magnetic materials, for example, for the production of inductance and capacitance type multilayer components, ^ &gt; Ll .. That is, LC composite type components must be co-fired with two or more different materials, magnetically conductive material and dielectric material. However, there are many problems associated with the co-firing of different materials. For example, the problem of material compatibility and compatibility, and the problem of cracking of long-term fired products. In order to overcome the problems caused by co-firing of different materials (magnetically permeable material ~ # and dielectric materials), which can have a high dielectric constant at the same time, for example, the US patent announcement LC composite ceramic component, Japanese patent 1. Dagger, ττ ·, inch 4; Report No. 6 2 1 4 7 7 0 3 n High permittivity oxide mArv ·. I „a§netic material, Japanese Patent No. 129140 61n High-perraiti ~ ..i,., · I Q n H Ltivity magnetic material and manufacture thereof, and U.S. Patent No. 5 8 5 6 77 0 &quot; FUter i, a solution is to find a material with uniform magnetic permeability. Previous ^ No. 5029043 &quot; Chip tyPe

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499399 V. Description of the invention (2) with ferroelectric-ferromagnetic composite materia 1 s π, the methods mentioned above for obtaining materials with both high dielectric constant and high magnetic permeability must first prepare magnetic material powder and Dielectric material powder. The magnetic material powder is, for example, obtained by sintering and pulverizing a ferrite-based magnetic body; and the dielectric material powder is, for example, B a / S r-T i 0 3 糸Or after sintering, it is obtained by crushing, and then the powders of these two different materials are mixed, granulated, shaped, and sintered to obtain a composite material with both magnetic and dielectric properties. However, when sintering with the above two powders, BaO and SrO in Ba / Sr-Ti03 will form barium ferrite and strontium ferrite with ferrite. These two ferrites are hard magnetic materials. The magnetic permeability is close to 1, and the magnetic permeability of the obtained composite material is greatly reduced. In summary, there is still a need to develop a new material capable of combining both high magnetic permeability and high electrical conductivity and a manufacturing method thereof to solve the above problems. [Objective and Summary of the Invention] Accordingly, the object of the present invention is to provide a ferrite having both high magnetic permeability and high permittivity, in addition to being used in an electronic component, such as an LC composite type component, as Magnetically permeable material and can also be used as a dielectric material. The ferrite of the present invention, which has both high magnetic permeability and high dielectric constant, has a composition of T ix (MF e 204 + 2x / y) y, where x + y is 1, 1, 0 &lt; x &lt; 1 and M is any metal or metals selected from the group consisting of Mn, Ni, Cu, and Zn. With this composition, it is possible to form a ferrite material having a magnetic permeability and a dielectric binary property with a permeability of 2 to 2 2 0, a dielectric constant of 17 to 2 7 7 5. Because of the magnetic permeability

499399 V. Description of the invention (3) Electrical ferrite materials are made of raw material powders, such as T i 0 2, F e 2 0 3 and one or more metals of η, Ni, Cu or Z η The oxides are mixed in a proper ratio and uniformly mixed, and then sintered into a single material system. There will be no hard magnetic phases such as barium ferrite or strontium ferrite, so high permeability and high dielectric properties can be obtained. Electrical constant. And it is particularly useful for applications such as LC composite components, which need to have both magnetically conductive materials and dielectric materials, and can avoid magnetically permeable materials (such as Ferrite) and dielectric materials (such as BaT i 0 3) The problems of compatibility, compatibility and cracking of finished products caused by co-firing of two different materials. According to a method for manufacturing a ferrite having both high magnetic permeability and high permittivity according to the present invention, a raw material powder of T i 0 2, a metal M oxide, and F e 20 3 is used to satisfy T ix (MF e 20 4 + 2x / y) The composition ratio of y is adjusted and uniformly mixed, where x + y = 1, 0 &lt; χ &lt; 1, wherein the metal M may be any one or more of Mn, Ni, Cu, or Zn η ; Then, the raw material powder which is uniformly mixed is calcined at a temperature of, for example, 75 ° C, and then ground into a fine powder; then the powder is compacted into a desired shape; Sintering at a temperature of 50 ° C will form a ferrite with high magnetic permeability and high dielectric constant. Among them, the ratio of X and y can be adjusted according to actual needs to obtain various binary ferrite materials with different magnetic permeability and dielectric constant, which can be applied to the manufacture of various components. In order to have a clearer understanding of the features of the present invention described above, as well as other features and advantages of the present invention, it will be described in detail with reference to the drawings. But it must be stated first that the present invention may have other embodiments except for the following embodiments.

499399 V. Description of the invention (4) [Detailed description of the embodiment] The ferrite with high magnetic permeability and high permittivity disclosed in the present invention is derived from a soft ferrite (S ft Ferrite) Research on loss behavior. In general ferrite magnets (F e r r i t e), there is often a pure precipitate at the grain boundary. The composition of this precipitate and its characteristics affect the loss greatly. Most researchers pay attention to the properties of this grain boundary layer, such as resistivity, but its dielectric properties also affect the loss behavior. Originally, under the requirements of low loss, efforts should be made to form a grain boundary layer with a low dielectric constant, but studies have found that if the other way around is to obtain not only ferrite with a high dielectric constant, but also to retain it in the ferrite Characteristics of high magnetic permeability. The ferrite according to the present invention is Ti x (MFe 20 4 + 2x / y) y, where x + y = 1, 0 &lt; x &lt; 1, and M is any one or more of Mη, Ni, Cu or Zn Mixing of metals. Take ^ 1 ^ (12%) + (: 11 (28%) + 211 (60%) ferrite as an example. Its composition is Tix (Ni〇i2CU (). 28Zn (). 6Fe2〇4 + 2x / y) y. The body oxygens fired in this group have different magnetic permeability and dielectric constant according to different proportions of X and y. As shown in the experimental data curve shown in "Figure 1", The magnetic permeability can be 2 to 2260, and the dielectric constant can be 17 to 2775. The best ratio among them is between 0. 0 0 3S 0. 1 5 and the magnetic permeability is 5 to 1 3 0 0 The dielectric constant is between 50 and 2 7 7 5. Therefore, as long as the X and y ratios in the above composition are properly adjusted, both high magnetic permeability and high dielectric can be obtained as required. The ferrite with a binary nature of the coefficient. The above-mentioned ferrite having high magnetic permeability and high dielectric constant of the present invention can be manufactured by a traditional precision ceramic manufacturing process, and the manufacturing process is shown in FIG. 2 . First prepare the raw material powder 10, and mix the appropriate raw material powder, such as

Page 7 499399 V. Description of the invention (5) Ding i 0 2, N i 0, Cu 0, Z η0, and F e 20 3, according to appropriate proportions to meet T ix (MF e 20 4 + 2x / y ) y, where x + y = 1, 0 &lt; x &lt; 1, in this embodiment M = Ni (12%) + Cu (28%) + Zη (60%). Then, a mixing step 20 is performed, and the above raw material powders are thoroughly mixed by a dry or water ball mill. Then, the calcining and grinding step 30 is performed, and the uniformly mixed raw material powder is calcined at an appropriate temperature, and the calcination temperature may be between 7 0 and 9 0 0 ° C, for example, 7 4 0 ° C. After calcining, the calcined product is ground with a water ball mill to form a fine powder having a particle diameter of about 0.2 to 1 micrometer, and the average particle diameter is, for example, 0.5 micrometer. Next, the forming step 40 is performed, and the above-mentioned fine powder is subjected to compression molding to obtain a desired shape. The density of raw embryos after compression molding is, for example, 3.0 g / cni3. Next, a sintering step 50 is performed, and the formed green body is sintered at an appropriate sintering temperature. The sintering temperature can be between 8 40 and 125 Q ° C, and the more suitable sintering temperature is about 900 to 110 ° C. Through the above steps, the ferrite having high magnetic permeability and high dielectric constant of the invention can be burned. In addition, the X and y ratios in the composition can be properly adjusted to obtain the required ferrite material with high permeability and high permittivity binary properties. This material can be used as both a magnetically permeable material and a dielectric material in the manufacture of an electronic component, avoiding the disadvantages of traditionally co-firing two different materials. For example, as shown in FIG. 3, it is a flowchart of manufacturing an electronic component including both an inductor and a capacitor element by using the ferrite material having high magnetic permeability and high dielectric constant according to the present invention. Which contains both inductance and electricity

Page 8 499399 V. Description of the invention (6) The content of the electronic component can be a laminated LC device 100 as shown in "Figure 4". First, a fine powder having an average particle diameter of 0.5 μm can be prepared according to the same steps as steps 10 to 30 in the above embodiment. Then, through the ferrite embryonic process steps 4 and 5, the powder is mixed with a binder to form a green embryo sheet. Then, the printing and stacking steps 4 and 6 are performed, and the conductor lines 1 0 3 required for forming the inductors 101 and capacitors 102 are printed on the green embryo made of the ferrite of the present invention, and the layers are laminated and combined. Become a compact embryo body. After the sintering step 50, the green body is sintered at an appropriate sintering temperature. The sintering temperature may be between 840 ° C and 125 ° C, and a more suitable sintering temperature is between 900 ° C and 110 ° C. In this way, a single-material inductor-capacitor composite component made of the ferrite 104 having both the south permeability and the south permittivity of the present invention is sintered. The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; that is, all equivalent changes and modifications made in accordance with the scope of the patent application for the present invention are covered by the scope of the patent for the present invention. .

499399 Brief description of the diagram [Simplified description of the diagram] Fig. 1 is an experimental data diagram of the magnetic permeability and dielectric constant of a ferrite having high magnetic permeability and high permittivity according to the present invention. FIG. 2 is a flowchart of manufacturing a ferrite having both high magnetic permeability and high dielectric constant according to the present invention. FIG. 3 is a flow chart of manufacturing a laminated LC device using a ferrite material having both high magnetic permeability and high dielectric constant according to the present invention. FIG. 4 is a schematic structural diagram of a multilayer LC device according to the present invention. [Illustration of Symbols] 10 Raw material powder preparation step 20 Mixing step 30 Calcination and grinding step 40 Forming step 45 Ferrite embryo forming step 4 6 Printing and laminating step 5 0 Sintering step 1 00 Laminating LC element 101 Inductance (L) 102 Capacitance (C) 10 3 Conductor line 1 0 4 Ferrite

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Claims (1)

499399 | Λ 1 口., / P ^ VI. Application for patent scope 1 --- one-one-one-- 1. A ferrite with high magnetic permeability and high permittivity, in addition to being used in an electronic component Outside the magnetically permeable material and at the same time as a dielectric material, it is characterized in that the composition of the ferrite is Tix (MFe204 + 2x / y) y 'where X + y = l' 0 &lt; x &lt; 1 and M is Any one or more metals selected from the group consisting of Mn, Ni, Cu, and Zn. 2. The ferrite with high permeability and high permittivity, as described in item 1 of the scope of patent application, has a permeability of 2 to 2 2 6 0 and a dielectric constant of 17 to 2 7 7 5 Elementary ferrite material. 3. The ferrite with high magnetic permeability and high permittivity as described in item 1 of the scope of the patent application, the optimal ratio of its composition is 0. 0 0 3S x S 0. 1 5. At this time, the magnetic permeability Between 5 and 1 3 0 0, the dielectric constant is between 50 and 2 7 50. 4. A method for manufacturing a ferrite having both high magnetic permeability and high permittivity, wherein the ferrite, in addition to being used as a magnetically permeable material in an electronic component and also as a dielectric material, includes at least the following steps: T i 0 2, the oxide of metal M and the raw material powder of F e 20 3 are formulated and uniformly mixed to meet the composition ratio of T ix (MF e 204 + 2x / y) y, where x + y = l, X &lt; 1, and M is any one or more metals selected from the group consisting of Mn, Ni, Cu, Z η; the raw material powder mixed with the homogeneous sentence is pre-fired and ground into a fine powder; Compress the powder into a desired shape; and sinter the powder after molding at a temperature of 840 to 125 ° C. 5. The method for manufacturing a ferrite having both high magnetic permeability and high dielectric coefficient as described in item 4 of the scope of patent application, wherein the X value is between 0.03 and 0.15. Page 11 499399 6. Scope of patent application 6. The manufacturing method of ferrite with high magnetic permeability and high dielectric constant as described in item 4 of the scope of patent application, wherein the uniformly mixed raw material powder is pre-fired The temperature is between 7 0 and 9 0 ° C. 7. The method for manufacturing a ferrite having both high magnetic permeability and high dielectric coefficient as described in item 4 of the scope of the patent application, wherein the particle size of the fine body is less than 1 micron. 8. The method for manufacturing a ferrite having both high magnetic permeability and high dielectric coefficient as described in item 4 of the scope of patent application, wherein the average particle diameter of the fine bodies is 0.5 micron. Page 12