JP2009228136A - 強磁性金属粒子粉末及びその製造法、並びに磁気記録媒体 - Google Patents
強磁性金属粒子粉末及びその製造法、並びに磁気記録媒体 Download PDFInfo
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- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
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Abstract
【解決手段】 ゲータイト粒子粉末を含む含液物を凍結させ、次いで、真空乾燥を行った後、加熱処理を行ってヘマタイト粒子粉末を得、該ヘマタイト粒子粉末を300〜600℃で加熱還元することで、かさが高く粒子同士が強固に凝結していないことによって、わずかな分散力で粒子がほぐれやすい共に、磁性塗料作製時の混練においてトルクがかかりやいすため磁気記録層中への充填率が高く、しかも高い表面平滑性が得られる強磁性金属粒子粉末を得ることができる。
【選択図】 なし
Description
本発明において最も重要な点は、ゲータイト粒子粉末を含む含液物を真空凍結乾燥した後、加熱処理を行ってヘマタイト粒子粉末を得、該ヘマタイト粒子粉末を300〜600℃で加熱還元することによって得られた強磁性金属粒子粉末は、分散性に優れると共に、磁気記録層中への充填率が高く、また、これを用いて得られる磁気記録媒体は高い表面平滑性が得られるという事実である。
ゲータイト粒子1(粒子形状:紡錘状、平均一次長軸径:51nm、軸比:8.8、BET比表面積値:243.5m2/g、かさ密度(ρa):0.31g/cm3、(D50)3bar/(D50)5bar:1.37、Co含有量(Co/Fe):40原子%、Al含有量(Al/Fe):20原子%、Y含有量(Y/Fe):20原子%)のスラリーを、常法により、水洗、濾過を行って固形分濃度を31重量%に調整した後、押し出し成形器にかけてゲータイト粒子1を含む顆粒状の含水物を得た。
上記で得られたゲータイト粒子6を大気中、350℃で脱水し、その後、同雰囲気中500℃で加熱脱水してヘマタイト粒子粉末を得た。
得られたヘマタイト粒子粉末100gを内径72mmのバッチ式固定層還元装置に入れ、層高を7cmとした後、水素ガス空塔速度50cm/sで通気しながら、350℃で排気ガス露点が−30℃に達するまで加熱還元して強磁性金属粒子粉末を得た。
ヘマタイト粒子粉末12gと結合剤樹脂溶液(スルホン酸カリウム基を有する塩化ビニル系共重合樹脂30重量%とシクロヘキサノン70重量%)及びシクロヘキサノンとを混合し、自動乳鉢を用いて30分間混練して混練物を得た。
非磁性下地層用ヘマタイト粒子粉末 100.0重量部、
(粒子形状:紡錘状、平均一次長軸径:0.099μm、軸比:6.2、BET比表面積値:59.1m2/g)
スルホン酸カリウム基を有する塩化ビニル系共重合樹脂 11.8重量部、
スルホン酸ナトリウム基を有するポリウレタン樹脂 11.8重量部、
シクロヘキサノン 78.3重量部、
メチルエチルケトン 195.8重量部、
トルエン 117.5重量部、
硬化剤(ポリイソシアネート) 3.0重量部、
潤滑剤(ブチルステアレート) 1.0重量部。
強磁性金属磁性粒子粉末 100.0重量部、
スルホン酸カリウム基を有する塩化ビニル系共重合樹脂 10.0重量部、
スルホン酸ナトリウム基を有するポリウレタン樹脂 10.0重量部、
研磨剤(AKP−50) 10.0重量部、
カーボンブラック 1.0重量部、
潤滑剤(ミリスチン酸:ステアリン酸ブチル=1:2) 3.0重量部、
硬化剤(ポリイソシアネート) 5.0重量部、
シクロヘキサノン 65.8重量部、
メチルエチルケトン 164.5重量部、
トルエン 98.7重量部。
出発原料としてのゲータイト粒子として、表1に示す諸特性を有するゲータイト粒子2〜5を準備した。
出発原料であるゲータイト粒子の種類、真空凍結乾燥処理の固形分濃度、予備凍結温度、真空度、及び乾燥温度を種々変化させた以外は、実施例1−1と同様にして真空凍結乾燥後のゲータイト粒子を得た。
実施例1−1と同様にして、ゲータイト粒子1を用いてゲータイト粒子1を含む顆粒状の含水物を得た。
ゲータイト粒子粉末の種類を種々変化させた以外は、前記実施例1−1と同様にして強磁性金属粒子粉末を得た。
実施例2−2〜2−6及び比較例2−1〜2−5:
強磁性金属粒子粉末の種類を種々変化させた以外は、前記実施例2−1と同様にして磁気記録媒体を製造した。
Claims (5)
- かさ密度(ρa)が0.25g/cm3以下であることを特徴とする強磁性金属粒子粉末。
- タップ密度が0.39g/cm3以下であることを特徴とする請求項1記載の強磁性金属粒子粉末。
- 分散圧3barにおける体積基準平均径(D50)3barと分散圧5barにおける体積基準平均径(D50)5barとの比が1.2以下であることを特徴とする請求項1又は請求項2記載の強磁性金属粒子粉末。
- ゲータイト粒子を含む固形分濃度50重量%以下の含液物を真空凍結乾燥した後に、該乾燥物を加熱脱水してヘマタイト粒子とし、該ヘマタイト粒子粉末を加熱還元して金属磁性粒子とすることを特徴とする請求項1乃至3のいずれかに記載の強磁性金属粒子粉末の製造法。
- 非磁性支持体、該非磁性支持体上に形成される非磁性粒子粉末と結合剤樹脂とを含む非磁性下地層及び該非磁性下地層の上に形成される磁性粒子粉末と結合剤樹脂とを含む磁気記録層からなる磁気記録媒体において、前記磁性粒子粉末が請求項1乃至3のいずれかに記載された強磁性金属粒子粉末であることを特徴とする磁気記録媒体。
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Cited By (1)
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JP2021153106A (ja) * | 2020-03-24 | 2021-09-30 | Tdk株式会社 | 流動性付与粒子および磁性コア |
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JP5769223B2 (ja) * | 2009-10-22 | 2015-08-26 | 戸田工業株式会社 | 強磁性粒子粉末及びその製造法、異方性磁石及びボンド磁石 |
DE102017207210A1 (de) * | 2017-04-28 | 2018-10-31 | Skz-Kfe Ggmbh | Verfahren zur additiven Herstellung eines Bauteils sowie additiv hergestelltes Bauteil |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0243943A (ja) * | 1988-04-12 | 1990-02-14 | Mitsuboshi:Kk | 超微粉体の製造法 |
JPH02307202A (ja) * | 1989-05-23 | 1990-12-20 | Dainippon Ink & Chem Inc | 磁性粉末の処理方法 |
JPH08183619A (ja) * | 1994-12-28 | 1996-07-16 | Kao Corp | 針状酸化鉄造粒物及びその製造方法 |
JP2002133638A (ja) * | 2000-10-27 | 2002-05-10 | Fuji Photo Film Co Ltd | 磁気記録媒体 |
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DE3217099A1 (de) * | 1982-05-07 | 1983-11-10 | Basf Ag, 6700 Ludwigshafen | Verfahren zur herstellung einer magnetdispersion |
JP3765428B2 (ja) * | 1995-02-21 | 2006-04-12 | 富士写真フイルム株式会社 | 磁気記録システム |
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2009
- 2009-02-27 US US12/394,473 patent/US20090220823A1/en not_active Abandoned
- 2009-02-27 JP JP2009046803A patent/JP5439861B2/ja active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0243943A (ja) * | 1988-04-12 | 1990-02-14 | Mitsuboshi:Kk | 超微粉体の製造法 |
JPH02307202A (ja) * | 1989-05-23 | 1990-12-20 | Dainippon Ink & Chem Inc | 磁性粉末の処理方法 |
JPH08183619A (ja) * | 1994-12-28 | 1996-07-16 | Kao Corp | 針状酸化鉄造粒物及びその製造方法 |
JP2002133638A (ja) * | 2000-10-27 | 2002-05-10 | Fuji Photo Film Co Ltd | 磁気記録媒体 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2021153106A (ja) * | 2020-03-24 | 2021-09-30 | Tdk株式会社 | 流動性付与粒子および磁性コア |
JP7338529B2 (ja) | 2020-03-24 | 2023-09-05 | Tdk株式会社 | 流動性付与粒子および磁性コア |
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