JP6928270B2 - 磁性粉末およびその製造方法 - Google Patents
磁性粉末およびその製造方法 Download PDFInfo
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- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- 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
- H01F1/032—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 hard-magnetic materials
- H01F1/04—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 hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/0551—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0552—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 in the form of particles, e.g. rapid quenched powders or ribbon flakes with a protective layer
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/14—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by electrical means
- B05D3/141—Plasma treatment
- B05D3/142—Pretreatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- C—CHEMISTRY; METALLURGY
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/0054—Plasma-treatment, e.g. with gas-discharge plasma
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/4584—Coating or impregnating of particulate or fibrous ceramic material
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/52—Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/85—Coating or impregnation with inorganic materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/89—Coating or impregnation for obtaining at least two superposed coatings having different compositions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- 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
- H01F1/032—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 hard-magnetic materials
- H01F1/04—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 hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/0533—Alloys characterised by their composition containing rare earth metals in a bonding agent
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- 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
- H01F1/032—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 hard-magnetic materials
- H01F1/04—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 hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/059—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and Va elements, e.g. Sm2Fe17N2
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Power Engineering (AREA)
- Inorganic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Hard Magnetic Materials (AREA)
- Powder Metallurgy (AREA)
Description
SmFeN磁性粉末を表面処理するためのガスをプラズマ処理することと、
プラズマ処理されたガスによりSmFeN磁性粉末を表面処理することと、
表面処理されたSmFeN磁性粉末の表面に被覆層を形成することと、
を含むことを特徴とする。
SinO(n−1)(OR)(2n+2)
(Rはアルキル基、nは1〜10の整数である。)
で示されるケイ酸エステルである。ここで、アルキル基としては、例えば、メチル基、エチル基、プロピル基、ブチル基等が使用できる。アルキル基は、特にコストが安価なこと、また、毒性がなく取り扱いが簡単なことからエチル基が好ましい。また、nの値はアルキルシリケートの分子量に関係し、n=1〜10の範囲のものが好ましく使用できる。nが10よりも大きくなると、緻密なシリカは得られにくくなる。アルキルシリケートの添加量は、エチルシリケートの種類、磁性粉末の種類、形状、粒子径等にも依存するが、磁性粉末100質量部に対して、1質量部以上10質量部以下が好ましく、1質量部以上5質量部以下がより好ましい。
大気圧プラズマ発生装置(マイクロ波出力2kW、照射エリアφ100mm)にて、平均粒径3μmのSm2Fe17N3系磁性粉末100gに対して、表1に示すガスの種類、ガスの流量、プラズマ照射時間のもと、プラズマ処理を行った。
続いてミキサーに、得られたプラズマ処理済みのSm2Fe17N3系磁性粉末にエチルシリケート(n=5)を添加して、混合した。その後、pHが12に調整されたアンモニア水を添加し1分間混合した。混合分散が終了した後に、ミキサーから磁性粉末を取り出し、減圧下230℃で30分間加熱処理し、表面にシリカ薄膜を形成したSm2Fe17N3系磁性粉末を得た。
プラズマ処理を行わず、それ以外は実施例1と同様にして表面にシリカ薄膜を形成したSm2Fe17N3系磁性粉末を得た。
実施例1におけるプラズマ処理済みのSm2Fe17N3系磁性粉末を比較例2とした。なお、この比較例2においては表面にシリカ薄膜を形成していない。
プラズマ処理工程の順番もしくはタイミングを、表1に記載の順番もしくはタイミングに変更する以外は実施例1と同様にして、表面にシリカ薄膜を形成したSm2Fe17N3系磁性粉末を得た。
実施例と比較例で得た磁性粉末を85℃、85%RHの恒温恒湿槽に200時間放置した後に、最大磁場16kOeVSM(振動試料型磁力計)を用いて、保磁力を測定した。
実施例と比較例で得た磁性粉末を、高周波誘導結合プラズマ発光分光分析法(ICP−AES)を用いて測定した。
Claims (5)
- SmFeN磁性粉末を表面処理するためのガスをプラズマ処理することと、
プラズマ処理されたガスによりSmFeN磁性粉末を表面処理することと、
表面処理されたSmFeN磁性粉末の表面に、ゾルゲル法、液相析出法、酸化拡散炉を利用した熱酸化、熱CVD装置を利用した成膜、または、スパッタ装置を利用した成膜により、シリカ薄膜を形成することと、
を含む磁性粉末の製造方法。 - 前記ガスがCF4、アルゴン、窒素または空気である請求項1に記載の磁性粉末の製造方法。
- 前記ガスがCF4である請求項2に記載の磁性粉末の製造方法。
- SmFeN磁性粉末と、
前記粉末の表面上に形成されたプラズマ処理層と、
前記処理層の表面に形成されるシリカ薄膜を含み、
前記プラズマ処理層がフッ素を含有し、前記フッ素の含有量が100ppm以上2000ppm以下である磁性粉末。 - SmFeN磁性粉末を表面処理するためのCF4をプラズマ処理することと、
プラズマ処理されたCF4によりSmFeN磁性粉末を表面処理することと、
表面処理されたSmFeN磁性粉末の表面に被覆層を形成することと、
を含む磁性粉末の製造方法。
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JP2018180239A JP6928270B2 (ja) | 2018-09-26 | 2018-09-26 | 磁性粉末およびその製造方法 |
US16/582,614 US11424055B2 (en) | 2018-09-26 | 2019-09-25 | Magnetic powder and preparation method thereof |
US17/812,715 US11710586B2 (en) | 2018-09-26 | 2022-07-14 | Magnetic powder |
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CN116685424A (zh) | 2020-11-19 | 2023-09-01 | 日亚化学工业株式会社 | 磷酸盐包覆SmFeN系各向异性磁性粉末的制造方法及粘结磁体 |
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JP2739600B2 (ja) * | 1989-10-03 | 1998-04-15 | 富士写真フイルム株式会社 | 強磁性金属粉末の処理方法及び磁気記録媒体の製造方法 |
US5395459A (en) * | 1992-06-08 | 1995-03-07 | General Motors Corporation | Method for forming samarium-iron-nitride magnet alloys |
JPH08111306A (ja) * | 1994-10-07 | 1996-04-30 | Mitsubishi Materials Corp | 耐食性に優れたボンド磁石用Nd−Fe−B系磁石粉末、ボンド磁石および磁石粉末の製造方法 |
JP2000047802A (ja) | 1998-07-27 | 2000-02-18 | Sharp Corp | 入力ペン保持機構 |
JP3719492B2 (ja) * | 1999-02-26 | 2005-11-24 | 日亜化学工業株式会社 | 希土類系磁性粉末及びその表面処理方法並びにそれを用いた希土類ボンド磁石 |
JP2005286315A (ja) | 2004-03-01 | 2005-10-13 | Showa Denko Kk | シリカ被覆した希土類系磁性粉末およびその製造方法並びにその用途 |
JP2005340290A (ja) * | 2004-05-24 | 2005-12-08 | Daido Steel Co Ltd | 硬磁性固形材料とその製造方法 |
JP4654709B2 (ja) * | 2004-07-28 | 2011-03-23 | 株式会社日立製作所 | 希土類磁石 |
JP2007109963A (ja) * | 2005-10-14 | 2007-04-26 | Sumitomo Metal Mining Co Ltd | 多角柱状マイクロアクチュエータ用小型磁石とその製造方法 |
JP5101849B2 (ja) * | 2006-09-14 | 2012-12-19 | 株式会社アルバック | 磁気特性、耐熱性、耐食性及び耐候性に優れたボンド磁石用の磁性材料の製造方法及びこの磁性材料を用いて作製した希土類ボンド磁石 |
JP5130270B2 (ja) | 2009-09-30 | 2013-01-30 | 株式会社日立製作所 | 磁性材料及びそれを用いたモータ |
KR101428524B1 (ko) * | 2012-12-10 | 2014-08-11 | 한국기초과학지원연구원 | 분말 플라즈마 처리 장치 |
US10325705B2 (en) * | 2015-08-24 | 2019-06-18 | Nissan Motor Co., Ltd. | Magnet particles and magnet molding using same |
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US11710586B2 (en) | 2023-07-25 |
US20220351882A1 (en) | 2022-11-03 |
US20200098495A1 (en) | 2020-03-26 |
US11424055B2 (en) | 2022-08-23 |
JP2020050904A (ja) | 2020-04-02 |
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