JP7089686B2 - MnZn系フェライトを用いた磁心 - Google Patents
MnZn系フェライトを用いた磁心 Download PDFInfo
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- JP7089686B2 JP7089686B2 JP2021153392A JP2021153392A JP7089686B2 JP 7089686 B2 JP7089686 B2 JP 7089686B2 JP 2021153392 A JP2021153392 A JP 2021153392A JP 2021153392 A JP2021153392 A JP 2021153392A JP 7089686 B2 JP7089686 B2 JP 7089686B2
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- 229910000859 α-Fe Inorganic materials 0.000 title claims description 69
- 239000013078 crystal Substances 0.000 claims description 26
- 229910052726 zirconium Inorganic materials 0.000 claims description 25
- 229910052715 tantalum Inorganic materials 0.000 claims description 20
- 229910052791 calcium Inorganic materials 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 230000035699 permeability Effects 0.000 claims description 11
- 229910020599 Co 3 O 4 Inorganic materials 0.000 claims description 10
- 229910052725 zinc Inorganic materials 0.000 claims description 10
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 9
- 230000004907 flux Effects 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 25
- 238000000034 method Methods 0.000 description 25
- 229910052760 oxygen Inorganic materials 0.000 description 25
- 239000001301 oxygen Substances 0.000 description 25
- 229910052758 niobium Inorganic materials 0.000 description 22
- 238000005245 sintering Methods 0.000 description 22
- 238000010583 slow cooling Methods 0.000 description 22
- 238000004519 manufacturing process Methods 0.000 description 14
- 229910052710 silicon Inorganic materials 0.000 description 13
- 239000012298 atmosphere Substances 0.000 description 12
- 239000000203 mixture Substances 0.000 description 12
- 230000008569 process Effects 0.000 description 12
- 239000011029 spinel Substances 0.000 description 12
- 229910052596 spinel Inorganic materials 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 11
- 238000001816 cooling Methods 0.000 description 11
- 239000011701 zinc Substances 0.000 description 10
- 239000002994 raw material Substances 0.000 description 9
- 235000013339 cereals Nutrition 0.000 description 7
- 229910021645 metal ion Inorganic materials 0.000 description 7
- 239000000843 powder Substances 0.000 description 7
- 238000000465 moulding Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 229910052748 manganese Inorganic materials 0.000 description 5
- 229910018663 Mn O Inorganic materials 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- -1 CaCO 3 Inorganic materials 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000011019 hematite Substances 0.000 description 2
- 229910052595 hematite Inorganic materials 0.000 description 2
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229910000846 In alloy Inorganic materials 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910007541 Zn O Inorganic materials 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 235000013365 dairy product Nutrition 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000011802 pulverized particle Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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Description
主成分としてFe、Mn及びZnを含み、副成分としてCa、Si及びCoとともに、Ta、Nb及びZrから選ばれる少なくとも1種を含むMnZn系フェライトの製造方法であって、
MnZn系フェライトの原料粉末を成形して成形体を得る成形工程、及び前記成形体を焼結する焼結工程を有し、
前記焼結工程は、昇温工程と、高温保持工程と、降温工程とを備え、
前記降温工程は、1100°C~1250°Cの温度域において、0~20°C/時間の降温速度で1~20時間冷却する徐冷工程を有し、前記徐冷工程の前後での降温速度が20°C/時間超であり、
前記MnZn系フェライトは、室温における体積抵抗率が8.5Ω・m以上であり、平均結晶粒径が7~15μmであり、周波数100 kHz及び励磁磁束密度200 mTの条件で測定したときの23°Cから140°Cでの磁心損失が420 kW/m3以下であることを特徴とする。
酸素濃度P[O2](体積分率)と温度T(°C)との関係が式:
log(P[O2])=a-b/(T+273)[ただし、a、bは定数であり、aは6.4~11.5、及びbは10000~18000である。]
を満たすように制御するのが好ましい。
前記主成分が、Fe2O3換算で53~54モル%のFe、ZnO換算で8.2~10.2モル%のZn及びMnO換算で残部Mnからなり、
前記副成分が、前記酸化物換算での前記主成分の合計100質量部に対して、SiO2換算で0.001質量部超0.015質量部以下のSi、CaCO3換算で0.1質量部超0.35質量部以下のCa、Co3O4換算で0.4質量部以下(0は含まず)のCo、Ta2O5換算で0.1質量部以下(0を含む)のTa、ZrO2換算で0.1質量部以下(0を含む)のZr、Nb2O5換算で0.05質量部以下(0を含む)のNbを含む(ただし、Ta2O5、ZrO2及びNb2O5の合計は0.1質量部以下(0を含まず)である。)ことを特徴とする
副成分が、前記酸化物換算での前記主成分の合計100質量部に対して、SiO2換算で0.001質量部超0.015質量部以下のSi、CaCO3換算で0.1質量部超0.35質量部以下のCa、Co3O4換算で0.4質量部以下(0は含まず)のCo、Ta2O5換算で0.1質量部以下(0を含む)のTa、ZrO2換算で0.1質量部以下(0を含む)のZr、Nb2O5換算で0.05質量部以下(0を含む)のNbを含み(ただし、Ta2O5、ZrO2及びNb2O5の合計は0.1質量部以下(0を含まず)である。)、
室温における体積抵抗率が8.5Ω・m以上であり、平均結晶粒径が7~15μmであり、周波数100 kHz及び励磁磁束密度200 mTの条件で測定したときの23°Cから140°Cでの磁心損失が420 kW/m3以下であり、周波数100 kHz及び20°Cの条件で測定したときの初透磁率μiが2800以上であることを特徴とする。
更に、Ta2O5換算で0.015質量部以上0.1質量部以下のTa、ZrO2換算で0.03質量部以上0.1質量部以下のZr、Nb2O5換算で0.02質量部以上0.05質量部以下のNbの少なくとも1種を含み(ただし、Ta2O5、ZrO2及びNb2O5の合計は0.1質量部以下(0を含まず)である。)、
周波数100 kHz及び励磁磁束密度200 mTの条件で測定したときの23°Cでの磁心損失が400 kW/m3以下であるのが好ましい。
log(P[O2])=a-b/(T+273)
を満たすように制御するのがより好ましい。ここで、a、bは定数であり、aは3.1~12.8、bは6000~20000であるのが好ましい。aは高温保持工程の温度と酸素濃度から規定される。bが前記の範囲よりも小さいと温度が下がっても酸素濃度が高く酸化が進み、スピネルからヘマタイトが析出する場合がある。bが大きいと酸素濃度が低下しウスタイトが析出したりして、結晶粒及び粒界層ともに十分に酸化されずに抵抗が小さくなる。より好ましくは、aは6.4~11.5、及びbは10000~18000である。
表1に示すように、主成分として、53.4モル%のFe2O3、9.2モル%のZnO及びMnO換算で37.4モル%のMn3O4を湿式混合した後乾燥させ、900°Cで3時間仮焼成した。次いで、ボールミルに、MnZn系フェライトとして表1に示す組成となるように、得られた仮焼成粉100質量部に対して、SiO2、CaCO3、Co3O4、Ta2O5、ZrO2及びNb2O5を加えて、平均粉砕粒径が1.2~1.4μmとなるまで粉砕・混合した。得られた混合物にバインダとしてポリビニルアルコールを加えて乳鉢で顆粒化した後、加圧成形してリング状の成形体を得て、それを焼結して外径φ25 mm×内径φ15 mm×厚み5 mmの磁心(フェライト焼結体)を得た。
磁心損失Pcvは岩崎通信機株式会社製のB-Hアナライザ(SY-8232)を用い、磁心に一次側巻線と二次側巻線とをそれぞれ5ターン巻回し、周波数100 kHz、励磁磁束密度200 mTで、23°C~140°Cにおける磁心損失を測定した。
初透磁率μiは、10回巻回した磁心に0.4 A/mの磁界を印加し、ヒューレッドパッカード製HP-4285Aを用いて、23°Cで100 kHzの条件で測定した。
平板状の試料を磁心から切出し、対向する二平面に電極としてガリウム・インジウム合金を塗布し、日置電機製3224を用いて電気抵抗R(Ω)を測定した。電極形成平面の面積A(m2)と厚みt(m)から、次式により体積抵抗率ρ(Ω・m)を算出した。
体積抵抗率ρ(Ω・m)=R×(A/t)
平均結晶粒径は、フェライト焼結体の鏡面研磨面にて結晶粒界をサーマルエッチング(1100°C×1hr、N2中処理)し、その表面を光学顕微鏡で400倍にて写真撮影し、この写真上の100μm×100μmの正方形領域において求積法により算出した。
実施例1と同様の製造方法で、表3に示すように主成分比を変更したMnZn系フェライトを作製した。表4に初透磁率μi、体積抵抗率ρ、平均結晶粒径及び磁心損失Pcvを評価した結果を示す。いずれのMnZn系フェライトも10Ω・m以上の高い体積抵抗率を示したが、比較例のMnZn系フェライトでは高温又は低温での磁心損失が420 kW/m3超える値となった。一方、実施例のMnZn系フェライトでは、いずれも420 kW/m3以下の磁心損失が得られた。
実施例1と同様の製造方法で、表5に示すように組成を変更し、表6に示すように高温保持工程の温度を変えてMnZn系フェライトを作製した。表6に初透磁率μi、体積抵抗率ρ、平均結晶粒径及び磁心損失Pcvを評価した結果を示す。いずれのMnZn系フェライトも8.5Ω・m以上の高い体積抵抗率を示したが、平均結晶粒径が7μmを下回る比較例の試料No.*40のMnZn系フェライトでは、140°Cの磁心損失が420 kW/m3超える値となった。一方、実施例のMnZn系フェライトでは、いずれも420 kW/m3以下の磁心損失が得られた。
実施例1と同様の製造方法で、表5に示すように組成を変更し、表7に示すように徐冷温度の範囲を変えてMnZn系フェライトを作製した。表7に初透磁率μi、体積抵抗率ρ及び磁心損失Pcvを評価した結果を示す。本発明の方法で規定する範囲の徐冷温度とすることで、低温(23°C)から高温(140°C)まで420 kW/m3以下の磁心損失を有するMnZn系フェライトが得られた。
実施例1と同様の製造方法で、表5に示すように主成分比を変更し、表8に示すように徐冷工程の降温速度を変えてMnZn系フェライトを作製した。表8に初透磁率μi、体積抵抗率ρ及び磁心損失Pcvを評価した結果を示す。本発明の方法で規定する範囲の降温速度とすることで、低温(23°C)から高温(140°C)まで420 kW/m3以下の磁心損失を有するMnZn系フェライトが得られた。
Claims (4)
- 主成分が、Fe2O3換算で53~54モル%のFe、ZnO換算で8.2~10.2モル%のZn及びMnO換算で残部Mnからなり、
副成分が、前記酸化物換算での前記主成分の合計100質量部に対して、SiO2換算で0.001質量部超0.015質量部以下のSi、CaCO3換算で0.1質量部超0.35質量部以下のCa、Co3O4換算で0.4質量部以下(0は含まず)のCo、Ta2O5換算で0.1質量部以下(0を含む)のTa、ZrO2換算で0.1質量部以下(0を含む)のZr、Nb2O5換算で0.05質量部以下(0を含む)のNbを含み(ただし、Ta2O5、ZrO2及びNb2O5の合計は0.1質量部以下(0を含まず)である。)、
23°Cから140°Cでの磁心損失が420 kW/m3以下(測定条件:周波数100 kHz、励磁磁束密度200 mT)であるMnZn系フェライトを用いた磁心。 - 請求項1に記載の磁心であって、前記MnZn系フェライトは室温における体積抵抗率が8.5Ω・m以上であり、平均結晶粒径が7~15μmである、MnZn系フェライトを用いた磁心。
- 請求項1に記載の磁心であって、前記MnZn系フェライトは周波数100 kHz及び20°Cの条件で測定したときの初透磁率μiが2800以上である、MnZn系フェライトを用いた磁心。
- 請求項1に記載のMnZn系フェライトにおいて、
前記副成分が、前記酸化物換算での前記主成分の合計100質量部に対して、SiO2換算で0.003質量部超0.012質量部以下のSi、CaCO3換算で0.1質量部超0.35質量部以下のCa、Co3O4換算で0.2質量部以上0.4質量部以下のCoを含み、
更に、Ta2O5換算で0.015質量部以上0.1質量部以下のTa、ZrO2換算で0.03質量部以上0.1質量部以下のZr、Nb2O5換算で0.02質量部以上0.05質量部以下のNbの少なくとも1種を含み(ただし、Ta2O5、ZrO2及びNb2O5の合計は0.1質量部以下(0を含まず)である。)、
周波数100 kHz及び励磁磁束密度200 mTの条件で測定したときの23°Cでの磁心損失が400 kW/m3以下であることを特徴とするMnZn系フェライトを用いた磁心。
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JP2004217452A (ja) | 2003-01-10 | 2004-08-05 | Tdk Corp | フェライト材料およびその製造方法 |
JP2008201639A (ja) | 2007-02-22 | 2008-09-04 | Sony Corp | 低損失フェライト材料 |
JP2009227554A (ja) | 2008-03-25 | 2009-10-08 | Tdk Corp | フェライト焼結体及びその製造方法 |
WO2016032001A1 (ja) | 2014-08-29 | 2016-03-03 | 日立金属株式会社 | MnZn系フェライトおよびその製造方法 |
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JP2022122983A (ja) | 2022-08-23 |
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TWI722151B (zh) | 2021-03-21 |
EP3441995A1 (en) | 2019-02-13 |
US10919809B2 (en) | 2021-02-16 |
JP6962315B2 (ja) | 2021-11-05 |
TW201802034A (zh) | 2018-01-16 |
JPWO2017164350A1 (ja) | 2019-02-07 |
WO2017164350A1 (ja) | 2017-09-28 |
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CN108780697A (zh) | 2018-11-09 |
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