JP2019064889A - Magnetic material, and laminated chip component - Google Patents

Abstract

To provide a magnetic material having excellent magnetic properties and being inexpensive.SOLUTION: A magnetic material has a x wt.% of ferrite and y wt.% of a metal magnetic material which are mixed together. The ferrite is Ni ferrite having a mol% of FeO, b mol% of ZnO, c mol% of CuO, and d mol% of NiO. The metal magnetic material is an FeSiCr alloy. Following relations are established: a+b+c+d=100, 40≤a≤45, 0<b≤30, 0<c≤15, x+y=100, 40≤x≤60.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a magnetic material and a laminated chip part.

  Electronic components that constitute electronic devices are required to operate at higher frequencies. Therefore, in the inductor which is one of the electronic components, high DC characteristics are required together with high magnetic characteristics and low magnetic loss. And as a magnetic material which comprises an inductor, there exist a metal magnetic material as described in the following patent document 1 grade | etc., Such as a ferrite. Further, Patent Document 2 below describes a magnetic material in which a ferrite thin film is formed on the surface of a nitrogen atomized alloy powder, and an insulating film is further formed on the thin film.

JP, 2015-65363, A Japanese Patent Application Laid-Open No. 5-36514

  With regard to the magnetic material constituting the inductor, the metal magnetic material described in the above-mentioned Patent Document 1 and the like is superior to the magnetic material using ferrite for the magnetic body in the magnetic characteristics, particularly the DC bias characteristics. However, because of low resistance, there is a problem of being affected by eddy current loss. In addition, the metallic magnetic material is used in a state of a sintered body molded into a predetermined shape or the like for a member of an electronic component such as a core of an inductor or a predetermined portion of an electronic component such as a magnetic layer of a well-known multilayer inductor. . Therefore, the metal magnetic material is obtained by adding an additive such as glass to a magnetic substance (hereinafter also referred to as a metal magnetic substance) made of a powdery alloy or the like for binding or insulation.

  However, the individual particles of the metallic magnetic material are hard metals, the particles themselves do not collapse during molding, the molding pressure needs to be increased, and the life of the molding die may be shortened. In addition, when the molding pressure is low, many gaps are generated between the particles of the metal magnetic material, and in order to obtain a dense sintered body, it is necessary to fill the gaps with a large amount of additive. However, if a large amount of additive that does not contribute to the magnetic properties is added, it becomes difficult to obtain the magnetic properties inherent to the metal magnetic body.

In the magnetic material described in Patent Document 2, the insulating film is formed on the surface of the metal powder, and the eddy current loss is low. However, since the thin film of ferrite and the insulating film are formed on the surface of the metal powder by a complicated process, the manufacturing cost becomes extremely high. In addition, since ferrite is generated by solid phase reaction when firing the raw material, if it is fired together with the powdered metal magnetic body, oxidation reaction of metal occurs before the ferrite causes solid phase reaction, and ferrite is Solid phase reaction (ferrite formation) may be inhibited. Therefore, the magnetic material described in Patent Document 2 immerses metal powder in an aqueous solution of NiCl ₂ and ZnCl ₂ which is a raw material of ferrite, and the operation of oxidizing in air is repeated to cause a ferritization reaction, and further, the ferrite An insulating film is formed by sputtering on the film of. Therefore, the manufacturing cost of the magnetic material increases, and it becomes difficult to provide the electronic component using the magnetic material at low cost.

  An object of the present invention is to provide an inexpensive magnetic material excellent in magnetic properties, and a laminated chip part using the magnetic material.

In one aspect of the present invention for achieving the above object, xwt% ferrite and ywt% metallic magnetic material are mixed,
The ferrite is a Ni-based ferrite containing amol% of Fe ₂ O ₃ , bmol% of ZnO, cmol% of CuO, and dmol% of NiO,
The metallic magnetic material is a FeSiCr alloy,
a + b + c + d = 100,
40 ≦ a ≦ 45,
0 <b ≦ 30,
0 <c ≦ 15,
x + y = 100,
40 ≦ x ≦ 60,
It is a magnetic material characterized by being.

In addition, it contains ewt% glass and fwt% lithium carbonate as additives with respect to the total mass of the Ni ferrite and the metal magnetic material,
0 <e ≦ 0.3,
0 <f ≦ 0.05
It is more preferable if the magnetic material is

Another aspect of the present invention is a laminated chip component in which an electrically insulating magnetic layer and an electrode layer on which an electrode pattern made of a conductor is formed are laminated in layers,
The magnetic layer is a sintered body made of a magnetic material,
The conductor is silver,
The magnetic material is a mixture of xwt% ferrite and ywt% metallic magnetic material,
The ferrite is a Ni-based ferrite containing amol% of Fe ₂ O ₃ , bmol% of ZnO, cmol% of CuO, and dmol% of NiO,
The metallic magnetic material is a FeSiCr alloy,
a + b + c + d = 100,
40 ≦ a ≦ 45,
0 <b ≦ 30,
0 <c ≦ 15,
x + y = 100,
40 ≦ x ≦ 60,
And a laminated chip component characterized by

  According to the present invention, an inexpensive magnetic material excellent in magnetic properties and a laminated chip part are provided. Other effects will be clarified in the following description.

It is a figure which shows the preparation procedures of the sample for evaluating the characteristic of the magnetic material which concerns on the Example of this invention. It is a figure which shows the heat contraction characteristic of the magnetic material which concerns on the Example of this invention.

=== Process to think about the present invention ===
As inductors mounted in electronic circuits, laminated inductors suitable for miniaturization are often used. The laminated inductor has a structure in which a magnetic layer made of a magnetic material and an electrode layer on which an electrode pattern is formed are laminated in layers. As a manufacturing procedure of the laminated inductor, first, a paste-like magnetic material to be a magnetic layer is formed into a sheet shape using a thick film technology, and an electrode pattern to be an electrode layer is formed on the sheet. Next, the laminate obtained by sequentially laminating the sheet-like magnetic material on which the electrode pattern is formed is fired. Then, in order to form an external electrode connected to an external electronic circuit, the conductive paste applied to the surface of the sintered body obtained by firing is baked.

  Ferrite generally includes Mn-Zn ferrite and Ni ferrite, but multilayer inductors generally use Ni ferrite (Ni-Zn, Ni-Zn-Cu, etc.) that can be fired at low temperatures. ) Is used as a magnetic substance. This is because it is common to use Ag (silver) having a melting point of 962 ° C. for the conductor forming the electrode pattern, and therefore the firing needs to be performed at a temperature lower than this temperature. However, Ni-based ferrite has a problem that the loss (core loss) is large as compared with Mn-Zn-based ferrite and the DC bias characteristics are deteriorated. It is also conceivable to increase the proportion of Fe (iron) in the Ni-based ferrite to increase the saturation magnetic flux density and improve the DC bias characteristics, but increasing the proportion of Fe increases the core loss and increases the Mn-Zn-based ferrite. The disadvantages of Ni-based ferrites become even more pronounced.

  Therefore, the present inventor considered that low-temperature firing is possible and excellent DC bias characteristics can be obtained as long as the magnetic material is a magnetic material containing both Ni-based ferrite and a metal magnetic material. In addition, if magnetic materials containing Ni-based ferrite and metallic magnetic material can be simultaneously fired as they are, the metallic magnetic material is bound via Ni-based ferrite without using many additives, and magnetic characteristics are obtained. It is believed that a compact sintered body can be obtained without losing the properties of Ni, and furthermore, Ni-based ferrite functions as an insulating film, and it is difficult to generate eddy current loss peculiar to metallic magnetic materials. Of course, the manufacturing process is also simplified. However, it has been found that when the magnetic material containing ferrite and the metallic magnetic material is simultaneously fired, the metallic magnetic material is oxidized even at a temperature of about 900 ° C. at which Ni ferrite is sintered, and the ferritization is suppressed.

  Therefore, the present inventor has intensively studied to realize a practical magnetic material including Ni-based ferrite and a metallic magnetic material. As a result, it has been found that Ni-based ferrite containing Zn and Cu and metallic magnetic material made of FeSiCr alloy can be fired at the same time. Then, by appropriately setting the ratio of each element constituting the Ni-based ferrite (hereinafter, also referred to as ferrite) and the ratio of the ferrite and the FeSiCr alloy (hereinafter, also referred to as metal magnetic material), ferrite is not included. It was confirmed that a magnetic material having magnetic properties equal to or higher than the metal magnetic material was obtained.

=== Examples ===
In order to evaluate the characteristics of the magnetic material according to the embodiment of the present invention, various magnetic materials having different proportions of ferrite and metal magnetic material, composition of ferrite, and addition amount of additives are manufactured, and the magnetic material is sintered. The sintered body was used as a sample. And the magnetic characteristic of each sample was measured.

FIG. 1 shows the preparation procedure of the sample. First, Fe ₂ O ₃ , ZnO, CuO, and NiO as raw materials of ferrite were weighed, and raw materials of these ferrites were mixed using a ball mill or the like (s 1). In the following description, when the proportion (mol%) of each element of Fe, Ni, Zn and Cu contained in ferrite is shown, the proportion of Fe, Ni, Zn and Cu is respectively Fe It is assumed that conversion is made with ₂ O ₃ , NiO, ZnO, and CuO.

Next, the mixture of ferrite raw materials was calcined at 750 ° C. (s2). Furthermore, the powder obtained by temporary calcination was further pulverized by a ball mill for 30 hours (s3). Here, the powder material after temporary firing was crushed until it had an average particle diameter of 0.5 μm. The powder of the metallic magnetic material was mixed with the powder after grinding (s4). Here, a metallic magnetic material having an average particle diameter of 10 μm was used. Thereby, it was ensured that the ferrite powder material having an average particle diameter of 0.5 μm was packed between the particles of the metallic magnetic material. Then, various additives were added to the powder material obtained by mixing the raw material of ferrite and the metal magnetic material by an amount according to the sample (s5) to obtain a magnetic material. In addition, glass and lithium carbonate (LiCO ₃ ) were used as additives. Borosilicate glass was used as the glass.

  Next, a binder such as a PVA aqueous solution is added to the powdery magnetic material obtained by the above procedure (s1 to s5), and granulation is performed so as to obtain a particle diameter of an appropriate size (s6), The granulated product was formed into a predetermined shape (s7). Here, it was molded in a ring shape having an outer diameter of 18 mm, an inner diameter of 9 mm, and a thickness of 2 mm at a molding pressure of 4 t. Then, the ring-shaped compact was fired at a temperature of 900 ° C., which is lower than the melting point of Ag, for one hour (s8) to obtain a ring core as a sample.

<Preliminary examination>
The main feature of the magnetic material according to the embodiment of the present invention is that the direct current superposition characteristics of the ferrite are improved by mixing the magnetic metal with the ferrite. Therefore, first, a magnetic material capable of improving direct current superposition characteristics by preparing a sample manufactured using a magnetic material not containing a metal magnetic body and a sample using a magnetic material obtained by mixing a metal magnetic body with ferrite. The preparation conditions of were confirmed. Here, in the step (s1) of weighing and mixing the raw materials of ferrite in the procedure shown in FIG. 1, the ratio (mol%) of Fe, Zn, Ni and Cu is changed according to the sample, and In the body mixing step (s4), 60 wt% of ferrite and 40 wt% of metal magnetic material were adjusted. Moreover, the mixing process (s4) of the metal magnetic material was abbreviate | omitted, and the sample containing only ferrite as a magnetic material was also produced. In the step of adding the additive (s5), the mass of the powder material made of the ferrite material obtained in the steps up to this step (s5) or the powder material made of the ferrite material and the metal magnetic material is Various additives were added at a weight ratio (wt%) according to the sample as 100 wt%. Here, 0.2 wt% of glass and 0.02 wt% of LiCO ₃ were added.

  Table 1 below shows the preparation conditions of the samples.

表１において、サンプル１〜４は、全て、フェライトが６０ｗｔ％、金属磁性体が４０ｗｔ％の割合で含まれている磁性材料を用いて作製したサンプルである。そして、サンプル１〜４は、それぞれ、フェライトに含まれるＦｅ、Ｚｎ、Ｎｉ、Ｃｕの割合が異なっている。ここでは、サンプル１〜４ごとに、直流重畳特性に影響するＦｅの割合を変えた。また、ＺｎとＣｕの割合を、それぞれ、３０ｍｏｌ％と１０ｍｏｌ％で一定とし、ＦｅとＮｉの割合を相補的に増減させて、各元素の組成割合の合計が１００ｍｏｌ％となるように調整した。そして、サンプル５〜８は、金属磁性体を含まない磁性材料を用いて作製したサンプルである。なお、サンプル５、６、７、および８は、フェライトの組成がサンプル１、２、３、および４と同じである。

In Table 1, Samples 1 to 4 are all samples produced using magnetic materials containing 60 wt% of ferrite and 40 wt% of metal magnetic material. The samples 1 to 4 have different proportions of Fe, Zn, Ni, and Cu contained in the ferrite, respectively. Here, the proportion of Fe affecting the DC bias characteristics was changed for each of the samples 1 to 4. Further, the proportions of Zn and Cu were fixed at 30 mol% and 10 mol%, respectively, and the proportions of Fe and Ni were complementarily increased or decreased to adjust the total of the composition proportions of the respective elements to 100 mol%. And samples 5-8 are samples produced using a magnetic material which does not contain a metallic magnetic material. Samples 5, 6, 7 and 8 have the same ferrite composition as samples 1, 2, 3 and 4.

  Next, the DC bias characteristics of the samples 1 to 8 manufactured under the conditions described above were evaluated. Here, a winding is wound around each sample with a predetermined number of turns (for example, three turns), and each sample is used as a core of a toroidal coil. Then, the inductance L of the core was measured using an LCR meter or the like to evaluate the DC bias characteristics. For the DC bias characteristics, for example, while passing an alternating current of 1 MHz through the winding wound around the core, the bias current is increased, and the inductance L is 20 for the inductance L when the bias current is 0 A. It evaluated by measuring the bias current value (Hereafter, it is also called saturation current value (A)) when% reduced. And, among samples 1 to 4 containing ferrite and a metallic magnetic material, sample 4 of which the proportion of Fe in the ferrite is 46 mol% does not improve the DC bias characteristics as compared with sample 8 using only ferrite having the same composition. The That is, samples 4 and 8 had equivalent saturation current values (A), and samples 1 to 3 had larger saturation current values (A) than samples 5 to 7.

<Magnetic characteristics>
In the samples 1 to 8 shown in Table 1, in the magnetic material in which the ferrite having a proportion of Fe of 46 mol% and the metal magnetic material were mixed at a mass ratio of 60 wt% and 40 wt%, no improvement was observed in the DC bias characteristics. . Therefore, samples were prepared using various magnetic materials different in the composition of ferrite and the mixing ratio of ferrite and metal magnetic material while adjusting the content of Fe in the ferrite to 45 mol% or less, and the magnetic characteristics of each sample were measured. Then, the relationship between the preparation conditions of the sample and the magnetic properties was investigated.

  Table 2 below shows the preparation conditions of the samples for measuring the magnetic properties.

表２において、サンプル９〜１１は、図１に示したサンプルの作製手順における秤量工程（ｓ１）に際し、サンプル３と同様に、Ｆｅ_２Ｏ_３を４５ｍｏｌ％、ＺｎＯを３０ｍｏｌ％、ＮｉＯを１５ｍｏｌ％、ＣｕＯを１０ｍｏｌ％としている。しかし、フェライトと金属磁性体との混合比率（ｗｔ％）がサンプル３とは異なっており、サンプル９、１０、および１１は、フェライトと金属磁性体との混合比率（フェライト：金属磁性体）が、３０ｗｔ％：７０ｗｔ％、４０ｗｔ％：６０ｗｔ％、および７５ｗｔ％：２５ｗｔ％となっている。

In Table 2, samples 9 to 11 were 45 mol% of Fe ₂ O ₃ , 30 mol% of ZnO, and 15 mol% of NiO in the same manner as sample 3 during the weighing step (s1) in the sample preparation procedure shown in FIG. , CuO is 10 mol%. However, the mixing ratio (wt%) of ferrite and metal magnetic body is different from that of sample 3, and samples 9, 10 and 11 have the mixing ratio of ferrite and metal magnetic body (ferrite: metal magnetic body) 30 wt%: 70 wt%, 40 wt%: 60 wt%, and 75 wt%: 25 wt%.

Sample 12 differs from sample 3 only in that the percentage of Cu is increased to 16 mol%, and the percentage of Ni is reduced to 9 mol% according to the increase. And, sample 13 and sample 14 have the same composition ratio (mol%) of each element in ferrite and the mixing ratio (wt%) of ferrite and metal magnetic material, but different addition amounts of additives. There is. Sample 13 has a glass content of 0.4 wt% with respect to 0.2 wt% of sample 3, and sample 14 has a LiCO ₃ content of 0.04 wt% with respect to 0.02 wt% of sample 3. It is.

  The magnetic properties of Samples 1 to 4 and Samples 9 to 14 are shown in Table 3 below.

表３に示したように、サンプル１〜４、サンプル９〜１４の磁気特性として、上述した直流重畳特性を示す飽和電流値（Ａ）の他に、周知のＢＨアナライザーを用いて、周波数１ＭＨｚにおける比透磁率（実数部μ’、虚数部μ”）、飽和磁束密度Ｂｍ（ｍＴ）、サンプルを４０００Ａ／ｍの磁界強度で磁化させた際の残留磁界強度（以下、保磁力とも言う）Ｈｃ（Ａ／ｍ）、およびコアロス測定した。コアロスＰ_ｃｖについては、測定時の最大磁気飽和密度Ｂｍを２０ｍＴとし、１ＭＨｚの周波数にて測定した。

As shown in Table 3, as the magnetic properties of Samples 1 to 4 and Samples 9 to 14, in addition to the saturation current value (A) showing the above-mentioned direct current superposition characteristics, using a known BH analyzer, at a frequency of 1 MHz Relative magnetic permeability (real part μ ', imaginary part μ ′ ′), saturation magnetic flux density Bm (mT), residual magnetic field strength (hereinafter also referred to as coercivity) Hc when the sample is magnetized at a magnetic field strength of 4000 A / m The core loss P _cv was measured at a frequency of 1 MHz with a maximum magnetic saturation density Bm of 20 mT at the time of measurement.

  The samples 1 to 4 and the samples 9 to 14 shown in Table 3 are manufactured to find conditions for improving the DC bias characteristics by mixing ferrite and a metallic magnetic material. Then, when judging the acceptance or rejection of each sample, the DC superposition characteristic of sample 4 is not improved even if the ferrite and the metallic magnetic material are mixed, based on the DC superposition characteristic of sample 4, and the DC superposition characteristic is equal to this sample 4. The following samples were initially rejected. Therefore, in addition to sample 4, samples 11 and 12 were rejected. Furthermore, for the samples 1, 2, 3, 9, 10, 13, 14 in which the DC bias characteristics were superior to those of the sample 4, the samples in which the relative magnetic permeability μ ′ and the saturation magnetic flux density Bm (mT) were specifically inferior 1 and sample 9 also failed.

  From the above, the magnetic material according to the embodiment of the present invention includes ferrite containing Zn, Ni, and Cu and a metallic magnetic material, and the proportion of Fe, Zn, and Cu in ferrite is 40 mol% or more and 45 mol%, respectively. In the following, 30 mol% or less and 15 mol% or less, the balance is Ni, and x + y = 100 and 40 ≦ x ≦ 60, assuming that the mass ratio of ferrite to metal magnetic material is x wt% and y wt%, respectively. It will be necessary.

  In the magnetic material of the present embodiment, by interposing a ferrite material between particles of powder metal magnetic material, the insulation property is secured without deteriorating the magnetic characteristics of the metal magnetic material, and eddy current is generated. Loss can be reduced. Therefore, the additive amount of the additive may be appropriately set so as to obtain the desired magnetic properties and sinterability.

Of course, in the magnetic material of this example, since the ferrite interposed between the particles of the metal magnetic material acts like a binder, it is sufficient even if no additive is added by increasing the molding pressure of the ferrite. It is believed that a dense sintered body can be obtained. However, addition of the additive makes high molding pressure unnecessary and leads to prolonging the life of the molding die. The additive also has the effect of lowering the sintering temperature of the magnetic material. Thus, the inclusion of additives in the magnetic material reduces the cost of manufacturing the final product using the magnetic material, such as a core for an inductor. However, for additives that do not contribute to the magnetic properties, it is better to minimize the amount added. And the samples 13 and 14 shown in Table 3 are samples for confirming the addition amount of a suitable additive, and the addition amount of an additive differs from the samples 1-4 and 9-10. Samples 13 and 14 have the same composition of ferrite and a mixture ratio (wt%) of ferrite and metal magnetic material as sample 3, but sample 13 has 0.2 wt% of glass in the amount of glass added. In the sample 14, the amount of added LiCO ₃ is increased to 0.04 wt% with respect to 0.02 wt% of the sample 3.

Then, among samples 2, 3 and 10 in which the additive amount of the additive was the same as sample 4 and the magnetic characteristics were excellent, sample 10 had the real part μ ′ of relative permeability (hereinafter, also relative permeability μ ′ Say) and saturation magnetic flux density Bm was the lowest. Then, relative to this sample 10, the relative magnetic permeability μ ′ decreased by about 10%, and the saturation magnetic flux density Bm decreased by about 20%. However, the samples 1 and 9 which had extremely low relative magnetic permeability μ 'and saturation magnetic flux density Bm had sufficiently excellent characteristics. Therefore, a margin of 0.1 wt% is secured with respect to the amount of 0.4 wt% of the glass of sample 13, and the preferred upper limit of the amount of glass added is 0.3 wt%. Also, set aside 0.01 wt% with respect to the addition amount 0.04 wt% of LiCO ₃ samples 14, a suitable upper limit of the addition amount of LiCO ₃ was 0.03 wt%.

Sinterability
The magnetic material according to the embodiment of the present invention reinforces the DC bias characteristics of the ferrite with the metal magnetic material, and suppresses the eddy current loss of the metal magnetic material with the ferrite. Furthermore, it is a mixture of a metal magnetic body which is difficult to form and ferrite which is easy to form. Therefore, the ease of molding and the sinterability of the magnetic material consisting only of a metallic magnetic material and the magnetic material according to the example of the present invention were examined.

  Here, first, a sample (referred to as sample A) manufactured under the same conditions as sample 10 shown in Table 3 was prepared. Furthermore, in the preparation procedure of the sample shown in FIG. 1, the step (s1 to s3) relating to ferrite is omitted, and the granulation step shown in FIG. 1 shows a mixture obtained by adding the additive to the metal magnetic body (s6) A sample (referred to as sample B) prepared in the procedure from the step to the firing step (s8) was prepared. The samples A and B were subjected to the molding step (s7) at a pressure of 4 t. Then, the shrinkage rate of the sample during execution of the firing step (s7) was measured using a thermomechanical analyzer (TMA).

  FIG. 2 shows the measurement results of TMA of sample A and sample B. As shown in FIG. 2, sample A has its volume shrunk sharply at temperatures above about 650 ° C. It can be seen that the sintered body is On the other hand, it was found that the sample B did not sinter even when it exceeded the firing temperature of 900 ° C., and a dense sintered body could not be obtained. That is, it was confirmed that in order to sinter the metal magnetic material densely, it is necessary to increase the molding pressure or to add more additives. Then, as described above, when the molding pressure is increased, the manufacturing cost of the sintered body is increased, and when the additive is increased, the magnetic characteristics are degraded. From the above, it has been confirmed that, with the magnetic material according to the example of the present invention, a dense sintered body having excellent magnetic properties can be manufactured at lower manufacturing cost.

=== action and effect ===
Although the metal magnetic body has high saturation magnetic flux density Bm, it has low resistance and it has been difficult to reduce eddy current loss. Therefore, in the conventional magnetic material, the metal magnetic body is mixed with glass which is an insulator, or the oxide film is formed on the powder surface of the metal magnetic body. However, glass and oxide films are nonmagnetic materials. Therefore, it has been difficult to improve the characteristics of the inductance L in an inductor using a conventional magnetic material.

  On the other hand, in the magnetic material according to the embodiment of the present invention, FeSiCr alloy, which is a metallic magnetic material, is mixed with high-resistance Ni-based ferrite. At the time of firing, a part of the metallic magnetic material reacts with the Ni-based ferrite. Thereby, an integral sintered body is obtained. In the Ni-based ferrite, when the composition ratio of Fe is increased, reduction in resistance, deterioration in sinterability, and the like occur. Therefore, in the magnetic material of the present embodiment, the composition ratio of Fe of the Ni-based ferrite is set to 40 mol% or more and 45 mol% or less, which is lower than 50 mol%. Thereby, in the magnetic material of the present example, even if it reacts with FeSiCr at the time of firing, it is possible to suppress the decrease in resistance and the deterioration in sinterability.

Furthermore, in the magnetic material of this example, the formation of ferrite is prioritized over the oxidation of the metal magnetic body during firing, so that the oxidation temperature of the metal magnetic body becomes high and reaction of the ferrite becomes possible at 900 ° C. It is possible to sinter. As a result, the magnetic permeability of the metallic magnetic body is also high. That is, in the magnetic material of the present embodiment, it is possible to suppress the deterioration of both the characteristics of the Ni ferrite and the characteristics of the metal magnetic body. Incidentally, the magnetic material of the embodiment the additive is added, a glass is often used as a sintering aid, that is set to less preferred upper limit of the addition amount of LiCO _3, the addition of non-magnetic material The sinterability is improved while minimizing the deterioration of the magnetic properties due to the above. In particular, it is considered that LiCO ₃ largely contributes to the reduction of the firing temperature by being liquid phased at the time of firing.

=== Other Examples ====
The magnetic material according to the embodiment of the present invention has preferable characteristics to be applied to the magnetic layer of the multilayer inductor, but it is needless to say that the present invention is applied to various electronic parts and members using magnetic materials. Can.

s1 Weighing and mixing process of ferrite raw materials, s2 pre-baking process, s3 crushing process,
s4 metal magnetic material mixing process, s5 additive addition process, s6 granulation process, s7 forming process, s8 firing process

Claims (3)

Mixture of xwt% ferrite and ywt% metallic magnetic material,
The ferrite is a Ni-based ferrite containing amol% of Fe ₂ O ₃ , bmol% of ZnO, cmol% of CuO, and dmol% of NiO,
The metallic magnetic material is a FeSiCr alloy,
a + b + c + d = 100,
40 ≦ a ≦ 45,
0 <b ≦ 30,
0 <c ≦ 15,
x + y = 100,
40 ≦ x ≦ 60,
Magnetic material characterized by being. The magnetic material according to claim 1, wherein
And the ewt% glass and the fwt% lithium carbonate as additives with respect to the total mass of the Ni ferrite and the metallic magnetic material,
0 <e ≦ 0.3,
0 <f ≦ 0.05
Magnetic material characterized by being. A laminated chip component in which an electrically insulating magnetic layer and an electrode layer on which an electrode pattern made of a conductor is formed are laminated in layers,
The magnetic layer is a sintered body made of a magnetic material,
The conductor is silver,
The magnetic material is a mixture of xwt% ferrite and ywt% metallic magnetic material,
The ferrite is a Ni-based ferrite containing amol% of Fe ₂ O ₃ , bmol% of ZnO, cmol% of CuO, and dmol% of NiO,
The metallic magnetic material is a FeSiCr alloy,
a + b + c + d = 100,
40 ≦ a ≦ 45,
0 <b ≦ 30,
0 <c ≦ 15,
x + y = 100,
40 ≦ x ≦ 60,
A laminated chip part characterized in that

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