JP2008050191A - Ferrite material for high frequency wave and method of manufacturing ferrite material for high frequency wave - Google Patents
Ferrite material for high frequency wave and method of manufacturing ferrite material for high frequency wave Download PDFInfo
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- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 78
- 239000000463 material Substances 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000000203 mixture Substances 0.000 claims abstract description 38
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 34
- 239000010941 cobalt Substances 0.000 claims abstract description 34
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000000843 powder Substances 0.000 claims description 11
- 238000010304 firing Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 5
- 230000035699 permeability Effects 0.000 abstract description 18
- 229910003321 CoFe Inorganic materials 0.000 abstract description 8
- 239000000654 additive Substances 0.000 abstract description 6
- 230000000996 additive effect Effects 0.000 abstract description 6
- 239000002245 particle Substances 0.000 abstract description 5
- 239000006104 solid solution Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 abstract 1
- 239000000523 sample Substances 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 12
- 239000006185 dispersion Substances 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 239000011162 core material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004453 electron probe microanalysis Methods 0.000 description 4
- 229910018605 Ni—Zn Inorganic materials 0.000 description 3
- 239000011812 mixed powder Substances 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 229910020599 Co 3 O 4 Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000012856 weighed raw material Substances 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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Abstract
Description
本発明は、Ｎｉ−Ｚｎ系の高周波用フェライト材料および高周波用フェライト材料の製造方法に関するもので、より具体的には、ＮｉＣｕＺｎフェライトを主成分とし、これに対する添加成分の分散状態の改良に関する。 The present invention relates to a Ni—Zn-based high-frequency ferrite material and a method for producing a high-frequency ferrite material, and more specifically, relates to an improvement in the dispersion state of an additive component based on NiCuZn ferrite.
よく知られるように、Ｎｉ−Ｚｎ系のフェライト材料は、抵抗率が高い特徴から高い周波数帯域で損失を少なくでき、高周波用のコア材料に用いられることが多い。そして、高周波特性を良好に得るため各種の工夫が行われており、例えばＣｏ３Ｏ４やＳｉＯ２などを添加することが行われている。また、例えば特許文献１などに見られるように、ＣｏＯを添加することも一般的である。 As is well known, Ni—Zn-based ferrite materials can reduce loss in a high frequency band because of their high resistivity, and are often used as high-frequency core materials. Various devices have been devised in order to obtain good high frequency characteristics. For example, Co 3 O 4 or SiO 2 is added. In addition, as seen in, for example, Patent Document 1, it is common to add CoO.
高周波特性のための添加成分を見ると、ＣｏＯやＣｏ３Ｏ４の添加では、焼成後に一部のＣｏ成分がＮｉＣｕＺｎフェライトにうまく固溶せず、主にＮｉＣｕＺｎフェライト中のＮｉやＺｎやＣｕと酸化物を形成する。これはＮｉＣｕＺｎフェライトの粒子間に偏析し、異相を形成する結果となる。このため、ＮｉＣｕＺｎフェライトの磁気特性を悪化させることになる。 Looking at additive components for high-frequency characteristics, with the addition of CoO and Co 3 O 4 , some Co components do not dissolve well in NiCuZn ferrite after firing, and mainly Ni, Zn and Cu in NiCuZn ferrite An oxide is formed. This results in segregation between the NiCuZn ferrite particles and the formation of a heterogeneous phase. For this reason, the magnetic characteristics of NiCuZn ferrite are deteriorated.
また、たとえＮｉ−Ｚｎ系のフェライト材料であっても、高周波帯域では損失が格段に大きくなり、このため透磁率が低下する特性を持っている。これは、例えば高周波帯域におけるノイズ対策コイルコアへの適用を考えると、小型に構成できないという問題になる。つまり、ノイズ除去で重要となるコイルのインピーダンスを大きく得たいときには、高周波帯域ではコア自体の透磁率が低減するので、コアサイズを大きくするか、あるいは巻線数を増すことが必要になり、何れにしても寸法サイズが大きくなってしまう。 Further, even if it is a Ni—Zn ferrite material, the loss is remarkably increased in the high frequency band, and thus the magnetic permeability is lowered. For example, when considering application to a noise countermeasure coil core in a high frequency band, there is a problem in that it cannot be made compact. In other words, when you want to increase the impedance of the coil, which is important for noise removal, the permeability of the core itself decreases in the high frequency band, so it is necessary to increase the core size or increase the number of windings. Even so, the size will increase.
近年は電子機器の薄型，軽量，高機能化により、これを構成する電子部品について小型化，小チップ化の要求が特に高いため、より小型化するための改善が求められている。 In recent years, as electronic devices have become thinner, lighter, and more functional, there is a particularly high demand for downsizing and downsizing of the electronic components that make up the electronic devices, so improvements for further downsizing are required.
この発明は上記した課題を解決するもので、その目的は、添加成分の分散状態を良好にすることができ、磁気特性の改善により高周波帯域でも透磁率を高く得ることができ、高周波用途への適用において小型化が良好に行える高周波用フェライト材料および高周波用フェライト材料の製造方法を提供することにある。 The object of the present invention is to solve the above-described problems. The purpose of the invention is to improve the dispersion state of the additive components, and to improve the magnetic properties, to obtain high permeability even in the high frequency band, and to achieve high frequency applications. An object of the present invention is to provide a ferrite material for high frequency and a method for producing the ferrite material for high frequency that can be reduced in size in application.
上記した目的を達成するために、本発明に係る高周波用フェライト材料は、（１）主成分はＮｉＣｕＺｎフェライトとし、副成分には少なくともコバルトフェライト(非化学量論組成を含む）を添加する組成にした。 In order to achieve the above-described object, the high-frequency ferrite material according to the present invention has a composition in which (1) the main component is NiCuZn ferrite and at least cobalt ferrite (including non-stoichiometric composition) is added as a subcomponent. did.
（２）また、コバルトフェライトの組成をＣｏ（１＋ｘ）Ｆｅ２（１−ｘ）Ｏ４(０＜ｘ≦０．０４）として、化学量論組成よりＦｅ量が少ない組成物を添加する組成とするとよい。 (2) Further, the composition of cobalt ferrite is Co (1 + x) Fe 2 (1-x) O 4 (0 <x ≦ 0.04), and a composition in which a composition having less Fe than the stoichiometric composition is added. Good.
係る構成にすることにより本発明では、副成分としてコバルトフェライトを添加するので、添加したコバルトフェライトはＮｉＣｕＺｎフェライトに固溶しやすく、Ｃｏは均一に分布する。このため、ＮｉＣｕＺｎフェライトの粒子間には異相は析出しなく、磁気特性は悪化がなく、むしろ良好にすることができる。 In this invention, since cobalt ferrite is added as a subcomponent in the present invention, the added cobalt ferrite is easily dissolved in NiCuZn ferrite, and Co is uniformly distributed. For this reason, a heterogeneous phase does not precipitate between the NiCuZn ferrite particles, and the magnetic properties are not deteriorated, but rather can be improved.
また、本発明の高周波用フェライトの製造方法では、ＮｉＣｕＺｎフェライトに、副成分としてコバルトフェライト(非化学量論組成を含む）粉末を混合し、所定の形状に成形後、焼成するようにした。 Further, in the method for producing a high-frequency ferrite of the present invention, cobalt ferrite (including non-stoichiometric composition) powder as a secondary component is mixed with NiCuZn ferrite, molded into a predetermined shape, and then fired.
本発明では、副成分としてコバルトフェライトを添加すると、Ｃｏが均一に分布し、異相は析出しなく、磁気特性を良好にすることができる。ここに、添加成分の分散状態を良好にすることができ、磁気特性の改善により高周波帯域でも透磁率を高く得ることができる。その結果、高周波用途への適用において小型化が良好に行える。 In the present invention, when cobalt ferrite is added as an accessory component, Co is uniformly distributed, no heterogeneous phase is precipitated, and magnetic characteristics can be improved. Here, the dispersion state of the additive component can be improved, and the magnetic permeability can be increased even in the high frequency band by improving the magnetic characteristics. As a result, it is possible to satisfactorily reduce the size in application to high frequency applications.
以下、本発明の好適な実施の形態について説明する。
（製造プロセス）
Hereinafter, preferred embodiments of the present invention will be described.
(Manufacturing process)
本発明に係る高周波用フェライト材料は、ＮｉＣｕＺｎフェライトに、副成分としてコバルトフェライトを添加する組成になっている。また、コバルトフェライトは、組成式をＣｏ（１＋ｘ）Ｆｅ２（１−ｘ）Ｏ４とおくとき、ｘは０より大きく０．０４以下として化学量論組成よりもＦｅ量が少ない組成物とすることもよい。 The ferrite material for high frequency according to the present invention has a composition in which cobalt ferrite is added as a subcomponent to NiCuZn ferrite. In addition, when the composition formula is Co (1 + x) Fe 2 (1-x) O 4 , cobalt ferrite is a composition in which x is larger than 0 and 0.04 or less, and the Fe amount is smaller than the stoichiometric composition. It is also good.
ＮｉＣｕＺｎフェライトは、Ｆｅ２Ｏ３が４３〜５０モル％、ＺｎＯが１０〜３５モル％、ＣｕＯが３〜１５％モル％、ＮｉＯが残り全量のモル％としている。この組成は一般的な配合比であり特に限定するものではない。 In the NiCuZn ferrite, Fe 2 O 3 is 43 to 50 mol%, ZnO is 10 to 35 mol%, CuO is 3 to 15% mol%, and NiO is the remaining mol%. This composition is a general blending ratio and is not particularly limited.
製造には、まずコバルトフェライトを得るため原料成分のＣｏＯ，Ｆｅ２Ｏ３を所定に秤量して湿式混合する。つまり、秤量した各原料成分は例えばボールミルで粉砕しつつ混ぜて混合紛体を製造し、次に９００℃の温度で仮焼きする。そして、仮焼きした焼結体は乳鉢などを用いて粉砕する。これとは別に、ＮｉＣｕＺｎフェライトを得るため原料成分のＦｅ２Ｏ３，ＺｎＯ，ＣｕＯ，ＮｉＯを所定に秤量して湿式混合し、これを次に８００℃の温度で仮焼きする。そして、仮焼きした焼結体はボールミルで粉砕し、粉砕は所定時間行う。 In production, first, raw material components CoO and Fe 2 O 3 are weighed and wet-mixed in order to obtain cobalt ferrite. That is, each raw material component weighed is mixed while being pulverized by, for example, a ball mill to produce a mixed powder, and then calcined at a temperature of 900 ° C. The calcined sintered body is pulverized using a mortar or the like. Separately, in order to obtain NiCuZn ferrite, the raw material components Fe 2 O 3 , ZnO, CuO, and NiO are weighed in a predetermined amount and wet-mixed, and then calcined at a temperature of 800 ° C. The calcined sintered body is pulverized by a ball mill and pulverized for a predetermined time.
次に、ＮｉＣｕＺｎフェライト粉体に対してコバルトフェライト粉体を所定に秤量して湿式混合し、そこへＰＶＡ溶液を１ｗｔ％添加し、これを造粒する。この後、ふるいを用いて製粒し、製粒した粉体は金型に入れて所定の圧力を加えて所定形状に成形し、これは電気炉等で焼成する。焼成は所定のトップ温度を所定の時間保持することとし、これにより焼成体を製造する。そして、この焼成体に研削加工を施して、所定形状に加工した高周波用フェライト材料を得る。 Next, the cobalt ferrite powder is weighed in a predetermined amount with respect to the NiCuZn ferrite powder and wet mixed, and 1 wt% of the PVA solution is added thereto and granulated. Thereafter, the mixture is granulated using a sieve, and the granulated powder is put in a mold and formed into a predetermined shape by applying a predetermined pressure, which is fired in an electric furnace or the like. Firing is carried out by maintaining a predetermined top temperature for a predetermined time, thereby producing a fired body. Then, the fired body is ground to obtain a high-frequency ferrite material processed into a predetermined shape.
仮焼きおよび焼成では温度管理が重要であり、要求特性に応じて適宜に設定する必要がある。仮焼きにおける温度はコバルトフェライトでは８００℃〜１０００℃が好ましく、ＮｉＣｕＺｎフェライトでは７００℃〜９００℃が好ましい。 Temperature management is important in calcination and firing, and it is necessary to set appropriately according to required characteristics. The temperature during calcining is preferably 800 ° C. to 1000 ° C. for cobalt ferrite, and 700 ° C. to 900 ° C. for NiCuZn ferrite.
焼成においては、焼結が十分に進んで緻密化するとともに粒成長することが必要なので、これを達成し得る最適温度に設定することになるが、組成が異なると最適温度も相違し、このため組成に応じてその都度適正に設定する必要がある。そこで本発明に係る組成にあっては、焼成における温度は９００℃〜１２００℃が好ましい。 In firing, sintering is sufficiently advanced and densified and grain growth is necessary, so it is set to an optimum temperature at which this can be achieved. It is necessary to set appropriately each time according to the composition. Therefore, in the composition according to the present invention, the firing temperature is preferably 900 ° C to 1200 ° C.
このように、本発明にあっては副成分としてコバルトフェライトを添加するので、添加したコバルトフェライト（ＣｏＦｅ2Ｏ4）はＮｉＣｕＺｎフェライトに固溶しやすく、Ｃｏは均一に分布する。このため、ＮｉＣｕＺｎフェライトの粒子間には異相は析出しなく、磁気特性は悪化がなく、むしろ良好にすることができる。 Thus, in the present invention, since cobalt ferrite is added as a subcomponent, the added cobalt ferrite (CoFe 2 O 4 ) is easily dissolved in NiCuZn ferrite, and Co is uniformly distributed. For this reason, a heterogeneous phase does not precipitate between the NiCuZn ferrite particles, and the magnetic properties are not deteriorated, but rather can be improved.
実施例において確認したが、複素透磁率の周波数特性だけを見ると、コバルトフェライトの添加量が少ない組成では、ＣｏＯを同等量添加した組成との差が小さく、改善の効果がさほどではないように見えてしまう。しかしそうではなく、コバルトフェライトの添加では、たとえ添加が少量であってもＣｏの分散状態には大きな差があり、均一に分散することから磁気特性には大幅な改善を期待できる。 As confirmed in the examples, looking only at the frequency characteristics of the complex magnetic permeability, the composition with a small amount of cobalt ferrite added has a small difference from the composition with the same amount of CoO added, so that the improvement effect is not so great. I can see it. However, the addition of cobalt ferrite has a large difference in the dispersion state of Co even if the addition is small, and since it is uniformly dispersed, a significant improvement in magnetic properties can be expected.
すなわち本発明によれば、添加成分の分散状態を良好にすることができ、磁気特性の改善により高周波帯域でも透磁率を高く得ることができる。その結果、高周波用途への適用において小型化が良好に行える。 That is, according to the present invention, the dispersion state of the additive component can be improved, and the magnetic permeability can be increased even in the high frequency band by improving the magnetic characteristics. As a result, it is possible to satisfactorily reduce the size in application to high frequency applications.
上記した製造プロセスにより試料の製造を行った。つまり、本発明の効果を実証するため、フェライト材料は組成を変更した複数を製造し、それら各試料について複素透磁率μ（μ＝μ′−ｊμ″），面内における元素分布を評価した。 The sample was manufactured by the above-described manufacturing process. That is, in order to demonstrate the effect of the present invention, a plurality of ferrite materials having different compositions were manufactured, and for each of these samples, the complex permeability μ (μ = μ′−jμ ″) and the element distribution in the plane were evaluated.
各試料は表１に示すように、副成分の組成を変更して製作してあり、本発明に係る副成分が相違する設定で試料１から試料９までの９種類とし、外形７ｍｍ、内径３ｍｍ、高さ４ｍｍのリング形状に形成した。
各試料において、主成分のＮｉＣｕＺｎフェライトは、Ｆｅ２Ｏ３＝４９モル％、ＺｎＯ＝２２モル％、ＣｕＯ＝６％モル％、ＮｉＯ＝２３モル％とした。 In each sample, the main component NiCuZn ferrite was Fe 2 O 3 = 49 mol%, ZnO = 22 mol%, CuO = 6% mol%, and NiO = 23 mol%.
試料１はコバルトフェライト（ＣｏＦｅ2Ｏ4）を５ｗｔ％とし、実施例１になっている。試料２はコバルトフェライト（ＣｏＦｅ2Ｏ4）を１５ｗｔ％とし、実施例２になっている。試料３はコバルトフェライト（ＣｏＦｅ2Ｏ4）は添加しないでＣｏＯを１ｗｔ％添加し、比較例１になっている。試料４はコバルトフェライト（ＣｏＦｅ2Ｏ4）は添加しないでＣｏＯを６ｗｔ％添加し、比較例２になっている。試料５はコバルトフェライト（ＣｏＦｅ2Ｏ4）は添加しないで、配合時にＣｏＯを１ｗｔ％添加し、比較例３になっている。試料６はコバルトフェライト（ＣｏＦｅ2Ｏ4）は添加しないで、ボールミルによる粉砕時にＣｏＯを１ｗｔ％添加し、比較例４になっている。試料７は添加するコバルトフェライトは化学量論組成よりもＦｅ量が少ない組成物とし、Ｃｏ（１＋ｘ）Ｆｅ２（１−ｘ）Ｏ４においてｘ＝０．０４とし、実施例３になっている。試料８は添加するコバルトフェライトは化学量論組成よりもＦｅ量が少ない組成物とし、Ｃｏ（１＋ｘ）Ｆｅ２（１−ｘ）Ｏ４においてｘ＝０．０８とし、実施例４になっている。試料９は添加するコバルトフェライトは化学量論組成よりもＦｅ量が少ない組成物とし、Ｃｏ（１＋ｘ）Ｆｅ２（１−ｘ）Ｏ４においてｘ＝０．１２とし、実施例５になっている。
Sample 1 is of Example 1 with 5 wt% cobalt ferrite (CoFe 2 O 4 ). Sample 2 is Example 2 in which cobalt ferrite (CoFe 2 O 4 ) is 15 wt%. Sample 3 is Comparative Example 1 with 1 wt% of CoO added without adding cobalt ferrite (CoFe 2 O 4 ). Sample 4 is a comparative example 2 in which 6 wt% of CoO is added without adding cobalt ferrite (CoFe 2 O 4 ). Sample 5 is Comparative Example 3 without adding cobalt ferrite (CoFe 2 O 4 ) and adding 1 wt% of CoO during blending. In Sample 6, no cobalt ferrite (CoFe 2 O 4 ) was added, and 1 wt% of CoO was added at the time of pulverization with a ball mill. In sample 7, cobalt ferrite to be added is a composition having a smaller amount of Fe than the stoichiometric composition, and x = 0.04 in Co (1 + x) Fe 2 (1-x) O 4 , which is Example 3. . In
製造は具体的には、まずコバルトフェライトを得るため原料成分のＣｏＯ，Ｆｅ２Ｏ３を所定に秤量し、秤量した各原料成分はボールミルで粉砕しつつ混ぜて混合紛体を製造し、次に９００℃の温度で仮焼きを行い、仮焼きした焼結体は乳鉢を用いて解砕した。また、ＮｉＣｕＺｎフェライトを得るため原料成分のＦｅ２Ｏ３，ＺｎＯ，ＣｕＯ，ＮｉＯを所定に秤量し、秤量した各原料成分はボールミルで粉砕しつつ混ぜて混合紛体を製造し、次に８００℃の温度で仮焼きを行い、仮焼きした焼結体はボールミルで粉砕し、粉砕は２０時間行った。 Specifically, first, in order to obtain cobalt ferrite, the raw material components CoO and Fe 2 O 3 are weighed in predetermined amounts, and the weighed raw material components are mixed while being pulverized by a ball mill, and then mixed powder is produced. The sintered body was calcined at a temperature of 0 ° C., and the calcined sintered body was crushed using a mortar. Further, in order to obtain NiCuZn ferrite, raw material components Fe 2 O 3 , ZnO, CuO, and NiO are weighed in predetermined amounts, and each weighed raw material component is mixed while being pulverized by a ball mill to produce a mixed powder. The sintered body was calcined at a temperature, the calcined sintered body was pulverized with a ball mill, and the pulverization was performed for 20 hours.
次に各試料については、表１に示す組成とするため、ＮｉＣｕＺｎフェライト粉体に対してコバルトフェライト粉体あるいはＣｏＯ粉体を所定に秤量して添加し、乳鉢を用いて十分に混合した。さらに、それぞれへＰＶＡ溶液を１ｗｔ％添加して造粒を行った。この後、ふるいを用いて製粒し、製粒した粉体は金型に入れて所定の圧力を加えて所定形状に成形し、これは電気炉で焼成した。焼成は１１５０℃のトップ温度で２時間行い、これにより焼成体を製造した。そして、この焼成体に研削加工を施して、所定形状に加工してフェライト試料を得た。 Next, for each sample, in order to obtain the composition shown in Table 1, cobalt ferrite powder or CoO powder was weighed and added to the NiCuZn ferrite powder in a predetermined amount, and sufficiently mixed using a mortar. Furthermore, granulation was performed by adding 1 wt% of the PVA solution to each. Thereafter, the mixture was granulated using a sieve, and the granulated powder was put in a mold and formed into a predetermined shape by applying a predetermined pressure, which was fired in an electric furnace. Firing was performed at a top temperature of 1150 ° C. for 2 hours, thereby producing a fired body. The fired body was ground and processed into a predetermined shape to obtain a ferrite sample.
各試料それぞれについて、複素透磁率μ（μ＝μ′−ｊμ″）の周波数特性を測定した。その結果、図１，図２，図４，図５に示す周波数特性を得た。 For each sample, the frequency characteristics of the complex permeability μ (μ = μ′−jμ ″) were measured. As a result, the frequency characteristics shown in FIGS. 1, 2, 4, and 5 were obtained.
図１から明らかなように、実施例１は比較例１との比較において、ほぼ同一となる複素透磁率では実部μ′の共鳴ピークが、高周波側に約１５ＭＨｚ高くなる特性であることを確認した。そして図２から明らかなように、実施例２は比較例２との比較において、ほぼ同一となる複素透磁率では実部μ′の共鳴ピークが、高周波側に約２５０ＭＨｚ高くなる特性であることを確認した。 As is clear from FIG. 1, in comparison with Comparative Example 1, Example 1 has a characteristic that the resonance peak of the real part μ ′ increases by about 15 MHz on the high frequency side when the complex permeability is substantially the same. did. As can be seen from FIG. 2, in comparison with Comparative Example 2, Example 2 shows that the resonance peak of the real part μ ′ is higher by about 250 MHz on the high frequency side when the complex permeability is substantially the same. confirmed.
また、実施例１，２および比較例１，２については、ＥＰＭＡ（Ｅｌｅｃｔｒｏｎ Ｐｒｏｂｅ Ｍｉｃｒｏ Ａｎａｌｙｓｉｓ）による元素分布分析を行った。つまり、それら試料の表面を切削してダイヤモンドペーストを用いた鏡面研磨を行い、当該観察面についてＥＰＭＡによる分析を行った。その結果、図３に示すＣｏの元素分布像を得た。 In addition, Examples 1 and 2 and Comparative Examples 1 and 2 were subjected to element distribution analysis by EPMA (Electron Probe Micro Analysis). That is, the surfaces of these samples were cut and mirror-polished using a diamond paste, and the observation surface was analyzed by EPMA. As a result, an element distribution image of Co shown in FIG. 3 was obtained.
図３から明らかなように、比較例１，２には点状にＣｏの偏析が見られるが、実施例１，２では均一に分散していることがわかる。 As can be seen from FIG. 3, although Co segregation is observed in a dotted manner in Comparative Examples 1 and 2, it can be seen that Examples 1 and 2 are uniformly dispersed.
また、図４に示す比較例３，４に注目すると、それぞれはＣｏＯの添加時期が違う比較例１と比べて混合度は格段によいはずである。しかし、複素透磁率は比較例１とほぼ同等の特性を示しており、実施例１，２のような高周波側へ延びる効果は認められない。したがって、ＣｏＯの添加では添加する時期の違い、および添加した際の混合度の違いには関わりがなく、実施例１，２が示す効果は得られないことを確認した。そしてこのことから、実施例１，２が示す特性は、コバルトフェライトを添加することによって得られるものであることは明らかである。 Further, when attention is paid to Comparative Examples 3 and 4 shown in FIG. 4, the degree of mixing should be significantly better than Comparative Example 1 in which the CoO addition time is different. However, the complex magnetic permeability shows almost the same characteristics as in Comparative Example 1, and the effect of extending to the high frequency side as in Examples 1 and 2 is not recognized. Therefore, it was confirmed that the addition of CoO was not related to the difference in the timing of addition and the difference in the mixing degree when added, and the effects shown in Examples 1 and 2 could not be obtained. From this, it is clear that the characteristics shown in Examples 1 and 2 are obtained by adding cobalt ferrite.
さらに、図５から明らかなように、化学量論組成よりもＦｅ量を少なくした実施例３では、実施例１と比べて実部μ′，虚部μ″の共鳴ピークが大きくなっており、より大きな複素透磁率が得られることを確認した。そして、化学量論組成からのズレ量ｘを大きくした実施例４，６では共鳴ピークが逆に低減しており、より好ましい範囲としては、ズレ量ｘは０から０．０４程度であることを確認した。 Further, as is apparent from FIG. 5, in Example 3 in which the Fe amount was less than the stoichiometric composition, the resonance peaks of the real part μ ′ and the imaginary part μ ″ were larger than in Example 1, It was confirmed that a larger complex permeability was obtained, and in Examples 4 and 6 in which the amount of deviation x from the stoichiometric composition was increased, the resonance peak was reduced conversely. It was confirmed that the amount x was about 0 to 0.04.
Claims (3)
A method for producing a ferrite material for high frequency, comprising mixing NiCuZn ferrite with cobalt ferrite (including non-stoichiometric composition) powder as an accessory component, forming the powder into a predetermined shape, and firing the powder.
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| CN103693949A (en) * | 2013-11-19 | 2014-04-02 | 横店集团东磁股份有限公司 | Soft magnetic NiCuZn ferrite material with characteristics of wide temperature range, low temperature coefficient, high frequency and low loss, and preparation method thereof |
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| WO2023021910A1 (en) * | 2021-08-17 | 2023-02-23 | 株式会社村田製作所 | Ferrite sintered body |
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| JP2013060332A (en) * | 2011-09-14 | 2013-04-04 | Fdk Corp | Ferrite plate |
| CN103693949A (en) * | 2013-11-19 | 2014-04-02 | 横店集团东磁股份有限公司 | Soft magnetic NiCuZn ferrite material with characteristics of wide temperature range, low temperature coefficient, high frequency and low loss, and preparation method thereof |
| JP2015117173A (en) * | 2013-12-20 | 2015-06-25 | Tdk株式会社 | Ferrite composition, ferrite plate, member for antenna element and antenna element |
| JP2015164897A (en) * | 2015-04-22 | 2015-09-17 | Fdk株式会社 | ferrite plate |
| CN105529127A (en) * | 2016-03-08 | 2016-04-27 | 佛山市川东磁电股份有限公司 | Integral magnetic core for magneto-dependent sensor and manufacturing method of integral magnetic core for magneto-dependent sensor |
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| WO2023021910A1 (en) * | 2021-08-17 | 2023-02-23 | 株式会社村田製作所 | Ferrite sintered body |
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