JP7474561B2 - 被覆処理液とその製造方法および被覆材の製造方法 - Google Patents
被覆処理液とその製造方法および被覆材の製造方法 Download PDFInfo
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- 238000000034 method Methods 0.000 claims description 12
- 229910052596 spinel Inorganic materials 0.000 claims description 11
- 239000011029 spinel Substances 0.000 claims description 11
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 10
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 32
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- 239000002245 particle Substances 0.000 description 19
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- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
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- 241000132539 Cosmos Species 0.000 description 2
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- 229910000831 Steel Inorganic materials 0.000 description 2
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- 235000014413 iron hydroxide Nutrition 0.000 description 2
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 2
- 229910000000 metal hydroxide Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
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- 239000010959 steel Substances 0.000 description 2
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- 239000005695 Ammonium acetate Substances 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229910017082 Fe-Si Inorganic materials 0.000 description 1
- 229910002588 FeOOH Inorganic materials 0.000 description 1
- 229910017133 Fe—Si Inorganic materials 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
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- 229910021529 ammonia Inorganic materials 0.000 description 1
- 235000019257 ammonium acetate Nutrition 0.000 description 1
- 229940043376 ammonium acetate Drugs 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
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- 238000009826 distribution Methods 0.000 description 1
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- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- 150000004692 metal hydroxides Chemical class 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 235000011056 potassium acetate Nutrition 0.000 description 1
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- 238000007873 sieving Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/60—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH greater than 8
- C23C22/62—Treatment of iron or alloys based thereon
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- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
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- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
- C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
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- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/68—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous solutions with pH between 6 and 8
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- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
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- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
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- H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/22—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
- H01F1/24—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
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- H01F41/14—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying magnetic films to substrates
- H01F41/16—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying magnetic films to substrates the magnetic material being applied in the form of particles, e.g. by serigraphy, to form thick magnetic films or precursors therefor
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- H01F10/10—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition
- H01F10/18—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition being compounds
- H01F10/20—Ferrites
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- Compounds Of Iron (AREA)
Description
(1)本発明は、2価の陽イオンとなる金属元素(M)とFeとを含む溶液からなり、軟磁性材の表面にスピネル型結晶構造(MFe2O4)のフェライト皮膜を形成するために用いられる被覆処理液の製造方法であって、MとFeを含む第1溶液を調製する第1調製工程と、非酸化雰囲気中で、該第1溶液へ塩基溶液を加えた第2溶液を得る第2調製工程とを備え、該第2溶液から前記被覆処理液を得る製造方法である。
本発明は被覆処理液としても把握できる。すなわち本発明は、2価の陽イオンとなる金属元素(M)とFeを含む溶液からなり、軟磁性材の表面にスピネル型結晶構造(MFe2O4)のフェライト皮膜を形成するために用いられる被覆処理液であって、MとFeを含みpHが7~12さらには7.5~11である被覆処理液でもよい。
本発明は、上述した各被覆処理液を用いた被覆材の製造方法としても把握できる。例えば、本発明は、上述した製造方法で得られた被覆処理液と軟磁性材とを接触させる処理工程を備え、その表面にスピネル型(MFe2O4)のフェライト皮膜が形成された被覆材の製造方法でもよい。
さらに本発明は、上述した製造方法により得られる被覆材としても把握できる。その一例として、表面にフェライト皮膜が形成された軟磁性粒子(軟磁性材)からなる磁心用粉末(被覆材)がある。また本発明は、その磁心用粉末を加圧成形して得られる圧粉磁心としても把握できる。
(1)本明細書でいうスピネル型フェライトは、MFe2O4(MO・Fe2O3)で表される立方晶系のソフトフェライトであり、MはMn、Zn、Mg、Cu、Ni、Sr、(Fe)等の2価の陽イオンとなる金属元素である。Mは、それらの一種でも二種以上でもよい。また本発明に係るフェライトは、MがFeであるマグネタイト(Fe3O4)でもよい。
本発明でいう各溶液の溶媒は、水に限らずアルコール等でもよい。つまり被覆処理液は、水溶液に限らずアルコール溶液等でもよい。本明細書では、水を溶媒とする場合を代表例として主に取り上げる。
第1溶液は、少なくともMとFeを含む溶液である。第1溶液は、例えば、各種の金属塩(塩化金属塩、硫酸金属塩等)を溶媒に溶解して得ることができる。金属塩を溶解させた水溶液(「金属塩水溶液」という。)は、通常、pH3~7さらにはpH4~6程度の酸性となる。なお、Mは、単種でも複数種でもよい。例えば、MがMnおよびZnであると、高比抵抗と高磁束密度の両立を図れる。
第2溶液は、第1溶液に塩基溶液を加えることにより得られる。塩基溶液は、NaOHやKOH等の塩基を溶解した溶液である。例えば、第1溶液に塩基溶液を滴下することにより、第2溶液(水溶液)のpHを所望値に精度よく効率的に調整できる。例えば、第1溶液と第2溶液が水溶液である場合、第2溶液のpHを7~12という広範囲内で微細に調整可能である。
被覆処理液は、上述した第2溶液でもよいし、その第2溶液にpH緩衝剤および/または尿素を含むものでもよい。pH緩衝剤として、例えば、酢酸カリウムや酢酸アンモニウムを用いることができる。尿素は、80℃以上で加水分解してアルカリ性となるため、pH調整の補助剤として機能する。水溶液中における尿素のモル濃度は、その水溶液中における金属イオン(M2+、Fe2+)となる金属元素の合計モル濃度に対して0.5~2倍とするとよい。さらに被覆処理液は、フェライト皮膜の形成を阻害しない限り、上述した以外の物質や元素(イオン)を含んでもよい。
溶液中におけるフェライト(粒子)の生成は、溶液中のFeイオンの酸化反応に律速され、その酸化反応は主に溶液中の溶存酸素に起因する。従って、溶存酸素の低減により、軟磁性材との接触前におけるフェライト生成の抑止が可能となる。
本発明の被覆材の一例として磁心用粉末がある。磁心用粉末は、本発明の被覆処理液を用いてフェライト皮膜を表面に形成した軟磁性粒子からなる。
軟磁性粉末は、強磁性元素(Fe、Co、Ni等)を主成分とすればよいが、特性、入手性、コスト等から純鉄または鉄合金からなるとよい。純鉄粉は、飽和磁束密度が高く、圧粉磁心の磁気特性の向上が図られる。鉄合金粉として例えば、Si含有鉄合金(Fe-Si合金)粉を用いると、Siによりその電気抵抗率が高められるため、圧粉磁心の比抵抗の向上ひいては渦電流損失の低減が図られる。
フェライト皮膜の膜厚は、例えば、10~500nmさらには30~150nmであると、圧粉磁心の高比抵抗と高磁束密度の両立が図られる。なお、「膜厚」は、フェライトが酸化物であることを利用して、オージェ電子分光分析法(AES)により、被覆粒子表面の酸素量の分布を測定することにより特定される。
本発明に係る被覆処理液と軟磁性粒子とを接触させる処理工程により、表面がスピネル型フェライトで被覆された軟磁性粒子からなる磁心用粉末が得られる。処理工程は、例えば、撹拌または流動させた軟磁性粒子、さらには加熱した軟磁性粒子へ、被覆処理液を噴霧する工程により行える。これにより、均質的なフェライト皮膜を効率的に軟磁性粒子の表面に形成できる。
処理工程後の軟磁性粉末から不要物を除去する洗浄工程を行うとよい。洗浄工程は、例えば、水洗後にエタノール洗いしてなされるとよい。不要物は、被覆処理液に含まれていた塩素、ナトリウム、硫酸、皮膜形成に寄与しなかったフェライト微粒子などである。
〈試料の製造〉
(1)軟磁性粉末
軟磁性粉末(原料粉末)として、純鉄からなる水アトマイズ粉を用意した。用いた各粉末の粒度は、上限値~下限値→粒度の順で記載すると、212~106μm→159μmである。粒度は、電磁式ふるい振とう器(レッチェ製)により分級(篩い分け)したときに用いたメッシュサイズの上限値と下限値の中央値である。軟磁性粉末に30μm未満の軟磁性粒子が含まれていないことは、SEMより確認している。軟磁性粉末は、見掛密度が2.5g/cm3であり、異形粒子から構成されていた。
MnまたはZnの一方とFeとの各金属塩(塩化物)を純水に溶解させた金属塩水溶液(第1溶液)に、NaOH水溶液(塩基溶液)を滴下して、pHを所望値にした被覆処理液(第2溶液)を調製した。
ハイスピードミキサー(株式会社アーステクニカ製)を用意し、その容体内に投入した軟磁性粉末を140℃(処理温度)に加熱しつつ、回転速度3.5m/secで撹拌した。処理温度は、チャンバー内に設置した熱電対により軟磁性粉末の温度を測定した。
処理工程後の軟磁性粉末を、水洗後、エタノール洗いをして、濾過した(洗浄工程)。これにより処理後の粒子表面に残存していたClや残渣等を除去した。この軟磁性粉末をマントルヒーターを用いて80℃で加熱乾燥させた(乾燥工程)。
乾燥工程後の粉末を篩い(メッシュサイズ:30μm)へ通して選別した。この選別工程により、軟磁性粒子の被覆に寄与せずに生成されたフェライト微粒子等を除去した。こうして、各被覆処理液によりフェライト被覆処理された軟磁性粒子(適宜「被覆粒子」という。)からなる磁心用粉末を得た。
(1)被覆粒子の表面をX線回折法(XRD)により測定した。これにより、各粒子表面に形成される皮膜が、スピネル型フェライト(MFe2O4 / M=Mn、Zn)からなることを確認した。
(1)図1から明らかなように、被覆処理液のpHを適切に調整することにより、皮膜中における金属元素(M=Mn、Zn)の含有量が大きく変化することがわかった。例えば、被覆処理液のpHを7付近から9付近へ変化させると、Mnの含有量を約8倍に増加させられることがわかった。
Claims (10)
- 2価の陽イオンとなる金属元素(M)とFeとを含む溶液からなり、軟磁性材の表面にスピネル型結晶構造(MFe2O4)のフェライト皮膜を形成するために用いられる被覆処理液の製造方法であって、
少なくともMnが含まれるMとFeを含む第1溶液を調製する第1調製工程と、
非酸化雰囲気中で、該第1溶液へ塩基溶液を加えてpH9~12の第2溶液を得る第2調製工程とを備え、
該第2溶液から前記被覆処理液を得る製造方法。 - 前記第1調製工程は、非酸化雰囲気中でなされる請求項1に記載の被覆処理液の製造方法。
- 前記第1調製工程は、Mを含む金属塩を溶解させた溶液へ、Feを含む金属塩を溶解させるか、またはFeを含む金属塩の溶液を混合する工程である請求項1または2に記載の被覆処理液の製造方法。
- 少なくとも一種の溶液または該溶液の調製に用いられる溶媒は、非酸化雰囲気中で不活性ガスによりバブリングが施される請求項1~3のいずれかに記載の被覆処理液の製造方法。
- 前記第2溶液は、pH9~11である請求項1~4のいずれかに記載の被覆処理液の製造方法。
- 前記被覆処理液は、pH緩衝剤および/または尿素をさらに含む請求項1~5のいずれかに記載の被覆処理液の製造方法。
- 前記第1溶液は、酸性である請求項1~6のいずれかに記載の被覆処理液の製造方法。
- 請求項1~7のいずれかに記載の製造方法で得られた被覆処理液と軟磁性材とを接触させる処理工程を備え、
該軟磁性材の表面にスピネル型(MFe2O4)のフェライト皮膜が形成された被覆材の製造方法。 - 前記軟磁性材は、軟磁性粒子であり、
前記被覆材は、前記フェライト皮膜を表面に有する該軟磁性粒子からなる磁心用粉末である請求項8に記載の被覆材の製造方法。 - 2価の陽イオンとなる金属元素(M)とFeを含む溶液からなり、軟磁性材の表面にスピネル型結晶構造(MFe2O4)のフェライト皮膜を形成するために用いられる被覆処理液であって、
少なくともMnが含まれるMとFeを含み、pHが9~12であると共に溶存酸素濃度が4ppm以下である被覆処理液。
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