JP6663138B2 - 端子付き圧粉磁心およびその製造方法 - Google Patents
端子付き圧粉磁心およびその製造方法 Download PDFInfo
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- 239000000428 dust Substances 0.000 title claims description 98
- 238000004519 manufacturing process Methods 0.000 title claims description 17
- 229910045601 alloy Inorganic materials 0.000 claims description 80
- 239000000956 alloy Substances 0.000 claims description 80
- 239000002245 particle Substances 0.000 claims description 51
- 229910052804 chromium Inorganic materials 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 24
- 238000007747 plating Methods 0.000 claims description 21
- 229910052782 aluminium Inorganic materials 0.000 claims description 18
- 229910052737 gold Inorganic materials 0.000 claims description 15
- 229910052709 silver Inorganic materials 0.000 claims description 15
- 229910052760 oxygen Inorganic materials 0.000 claims description 14
- 239000004020 conductor Substances 0.000 claims description 13
- 238000004544 sputter deposition Methods 0.000 claims description 12
- 229910052759 nickel Inorganic materials 0.000 claims description 9
- 238000007740 vapor deposition Methods 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 238000001704 evaporation Methods 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 229910052719 titanium Inorganic materials 0.000 claims description 8
- 229910052718 tin Inorganic materials 0.000 claims description 6
- 239000011812 mixed powder Substances 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 56
- 239000010408 film Substances 0.000 description 33
- 238000010438 heat treatment Methods 0.000 description 30
- 239000000843 powder Substances 0.000 description 25
- 238000000465 moulding Methods 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 13
- 238000009413 insulation Methods 0.000 description 10
- 239000011230 binding agent Substances 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 238000007254 oxidation reaction Methods 0.000 description 8
- 230000005684 electric field Effects 0.000 description 7
- 229910000859 α-Fe Inorganic materials 0.000 description 7
- 230000003647 oxidation Effects 0.000 description 6
- 229910000604 Ferrochrome Inorganic materials 0.000 description 5
- 239000000696 magnetic material Substances 0.000 description 5
- 239000000523 sample Substances 0.000 description 5
- 229910000679 solder Inorganic materials 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 229910001035 Soft ferrite Inorganic materials 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000009713 electroplating Methods 0.000 description 3
- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- -1 ferrous metals Chemical class 0.000 description 3
- 229910018104 Ni-P Inorganic materials 0.000 description 2
- 229910018487 Ni—Cr Inorganic materials 0.000 description 2
- 229910018536 Ni—P Inorganic materials 0.000 description 2
- 229910020816 Sn Pb Inorganic materials 0.000 description 2
- 229910020922 Sn-Pb Inorganic materials 0.000 description 2
- 229910008783 Sn—Pb Inorganic materials 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 229910000833 kovar Inorganic materials 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910000967 As alloy Inorganic materials 0.000 description 1
- 229910017813 Cu—Cr Inorganic materials 0.000 description 1
- 229910017082 Fe-Si Inorganic materials 0.000 description 1
- 229910017133 Fe—Si Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 229910018054 Ni-Cu Inorganic materials 0.000 description 1
- 229910018481 Ni—Cu Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910002796 Si–Al Inorganic materials 0.000 description 1
- 229910008458 Si—Cr Inorganic materials 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 229920005822 acrylic binder Polymers 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000007606 doctor blade method Methods 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009689 gas atomisation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 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 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000009692 water atomization Methods 0.000 description 1
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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
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- 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
- H01F1/14—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
- 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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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- H01F1/26—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 by macromolecular organic substances
Description
Fe基合金として、質量百分率でFe−5.0%Al−4.0%Crの合金組成を有するアトマイズ粉を準備した。アトマイズ粉の平均粒径(メジアン径D50)は10μmであった。前記Fe基合金の粒子粉100質量部に対して、アクリル系バインダーを0.75質量部の割合で混合した。混合粉を乾燥し、篩に通して造粒粉を得た。この造粒粉を、プレス機を使用して、0.91GPaの成形圧で室温にて加圧成形した。得られた成形体に、大気中750℃で1.0時間保持する条件で熱処理を施した後、炉冷して圧粉磁心を得た。なお圧粉磁心は、図3に示したドラムコアであって、その外形寸法は縦1.5mm、横2.0mm、高さ1.0mmである。
比較例として、実施例1と同様に作製された圧粉磁心を使用し、第1の層を形成しないで、圧粉磁心の表面の下地層に、膜厚が0.5μmのAg膜を第2の層として蒸着法により直接形成し、更に実施例と同様にしてNiめっき、Snめっきを行い第3の層を形成した。各めっき膜厚も実施例1と同様にして端子を有する圧粉磁心を得た(比較例1)。また圧粉磁心の表面にAgペーストを印刷し650℃で焼き付けて、Agを主成分とする膜厚が6μmの第2の層を形成し、それに重ねて実施例1と同様にしてNiめっき、Snめっきを行い第3の層を形成し、各めっき膜厚も実施例1にして端子を有する圧粉磁心を得た(比較例2)。
実施例1と同じFe基合金の粒子粉を使用し、同じ条件で加圧成形した。得られた成形体に、大気中580℃、750℃で1.0時間保持する条件で熱処理を施した後、炉冷して圧粉磁心を得た。なお圧粉磁心は板状で、その外形寸法は縦5.0mm、横5.0mm、高さ2.0mmである。
580℃で熱処理したものに、第1の層を形成せず、FeCr合金の第2の層を蒸着法により直接形成した。さらに第2の層に重ねて蒸着法によりNi膜と、それに重ねて蒸着法によりSn膜を形成して第3の層とした。
2 第2の層
3 第1の層
4 Fe基合金の粒子
10a、10b 鍔部
20 胴部
40 端子付き圧粉磁心
50 端子
100 コイル
120 コイル部品
Claims (11)
- Feと、Feよりも酸化しやすい元素M(MはCr又はAlの少なくとも1種)を含むFe基合金の粒子で構成された圧粉磁心と、前記圧粉磁心の表面に間隔をもって形成された少なくとも2つの端子とを備える端子付き圧粉磁心であって、
前記圧粉磁心は、表面に形成された前記Fe基合金の粒子に由来する前記元素M及びFeを含む酸化物の下地層を有し、
前記圧粉磁心の前記端子を形成する領域を含む表面には、Cr酸化物又はAl酸化物の第1の層が前記下地層と重ねて形成されており、
前記端子は、前記第1の層の表面に重ねて形成されたAu、Ag、Cu、Ti又はCrのいずれかを含む導体の第2の層を有し、
前記下地層の厚みtuは100nm以下であり、
前記第1の層の厚みt1は50nm超300nm以下である端子付き圧粉磁心。 - 請求項1に記載の端子付き圧粉磁心であって、
前記下地層の厚みtuは50nm以上である端子付き圧粉磁心。 - 請求項1または2に記載の端子付き圧粉磁心であって、
前記下地層の厚みtuと前記第1の層の厚みt1とが、tu<t1の関係にあり、
前記下地層の厚みtuと前記第1の層の厚みt1との合計が150nm以上である端子付き圧粉磁心。 - 請求項1から3のいずれかに記載の端子付き圧粉磁心であって、
前記端子は、前記第2の層の表面に形成されたNi、Au、Ag又はSnのいずれかを含む導体の第3の層をさらに有し、
前記第2の層の厚みt2は0.1μm以上であり、
前記第3の層の厚みt3は1.0μm以上15.0μm以下である端子付き圧粉磁心。 - 請求項1から4のいずれかに記載の端子付き圧粉磁心であって、
前記第1の層は、Cr酸化物で構成されている端子付き圧粉磁心。 - 請求項1から5のいずれかに記載の端子付き圧粉磁心であって、
前記圧粉磁心の一面に2つの端子が並んで形成されていて、
少なくとも前記端子間を含む前記圧粉磁心の一面の全体に前記下地層が形成された端子付き圧粉磁心。 - 請求項1から5のいずれかに記載の端子付き圧粉磁心であって、
前記圧粉磁心の相対密度は83%以上である端子付き圧粉磁心。 - 請求項1から7のいずれかに記載の端子付き圧粉磁心の製造方法であって、
前記Fe基合金の粒子由来の前記元素M及びFeを含む酸化物の下地層が表面に形成された圧粉磁心を作製する工程、
前記圧粉磁心の前記端子を形成する領域を含む表面にCr酸化物又はAl酸化物の第1の層を前記下地層に重ねて形成する工程、及び
前記第1の層に重ねてAu、Ag、Cu、Ti、Fe又はCrのいずれかを含む導体の第2の層を形成する工程
を含み、
前記下地層の厚みtuは100nm以下であり、
前記第1の層の厚みt1は50nm超300nm以下であり、
前記第1の層をスパッタリング法又は蒸着法で形成する圧粉磁心の端子付き圧粉磁心の製造方法。 - 請求項8に記載の端子付き圧粉磁心の製造方法であって、
前記第2の層をスパッタリング法又は蒸着法で形成する端子付き圧粉磁心の製造方法。 - 請求項8または9に記載の圧粉磁心の端子付き圧粉磁心の製造方法であって、
前記第2の層に重ねてNi、Au、Ag又はSnのいずれかを含む第3の層をめっき法により形成する工程をさらに含む端子付き圧粉磁心の製造方法。 - 請求項8から10のいずれかに記載の端子付き圧粉磁心の製造方法であって、
前記圧粉磁心を作製する工程は、
前記Fe基合金の粒子を含む混合粉を所定の形状に成形する工程と
前記成形工程で得られた成形体を、酸素を含む雰囲気中で650〜850℃で0.5〜3時間熱処理して圧粉磁心を得る工程であって、前記Fe基合金の粒子を前記元素Mを含む酸化物で結合させるとともに、前記元素Mを含む酸化物の前記下地層を前記圧粉磁心の表面に形成する工程と
を含む端子付き圧粉磁心の製造方法。
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