JP5148502B2 - セラミック焼結体とそれを用いた磁気ヘッド用基板および磁気ヘッドならびに記録媒体駆動装置 - Google Patents
セラミック焼結体とそれを用いた磁気ヘッド用基板および磁気ヘッドならびに記録媒体駆動装置 Download PDFInfo
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- JP5148502B2 JP5148502B2 JP2008543109A JP2008543109A JP5148502B2 JP 5148502 B2 JP5148502 B2 JP 5148502B2 JP 2008543109 A JP2008543109 A JP 2008543109A JP 2008543109 A JP2008543109 A JP 2008543109A JP 5148502 B2 JP5148502 B2 JP 5148502B2
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/40—Protective measures on heads, e.g. against excessive temperature
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- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
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Description
ところで、Al2O3結晶粒子の平均結晶粒径に対する外部TiC結晶粒子の平均結晶粒径比率(以下、粒径比率という。)は、機械加工性や、例えば、反応性イオンエッチング法に代表される化学反応を利用した加工の微細加工性に影響し、その比率は45〜95%とすることが好ましい。この粒径比率を45〜95%としたのは、45%未満では、焼結体が磁気ヘッドであって反応性イオンエッチング法によってスライダに流路面を形成する場合、Al2O3結晶粒子よりTiC結晶粒子は、その反応性が高いためにAl2O3結晶粒子とTiC結晶粒子との間で大きな高低差を生む。その結果、流路面の凹凸が大きくなり、磁気ヘッドが浮上しているときに凹凸に起因する乱流が発生して、磁気ヘッドの浮上姿勢が不安定となるおそれがあるからである。粒径比率が95%を超えると、TiC結晶粒子の粒成長に伴う残留歪みが増加し、磁気ヘッド用基板からチップ形状の磁気ヘッドに切断するときに生じる欠けが大きくなるおそれがある。
生成したTiCxOyは、TiOの固溶量yに応じて、TiCの格子定数は異なり、固溶量yが0.15のときに格子定数が最も大きく、0.15より大きくても小さくても格子定数は小さくなり、その差はTiCからなる結晶相の均一性に影響を与える。
まず、Al2O3粉末、TiC粉末およびTiO2粉末をそれぞれ表1に示す比率にて調合した後、混合して調合原料を得た。また、Al2O3粉末およびTiC粉末のみを用いた原料粉末も作製した。
実施例1と同様に、Al2O3粉末、TiC粉末およびTiO2粉末をそれぞれ表2に示す比率にて調合した後、混合して調合原料を得た。
実施例1と同様に、Al2O3粉末、TiC粉末およびTiO2粉末をそれぞれ表3に示す比率にて調合した後、混合し原料粉末を得た。
実施例1と同様に、Al2O3粉末、TiC粉末およびTiO2粉末をそれぞれ表4に示す比率にて調合した後、混合して調合原料得た。
実施例1と同様に、Al2O3粉末、TiC粉末およびTiO2粉末をそれぞれ表5に示す比率にて調合した後、混合して調合原料を得た。
まず、Al2O3粉末,TiC粉末,TiO2粉末,Yb2O3粉末,成形用結合剤および分散剤を所定量混合し、スラリーを作製した。このスラリーを噴霧乾燥機に投入して、顆粒とした後、乾式加圧成形にて成形体を得た。次に、この成形体を図8に示すような段積み状態で20段配置し、アルゴン雰囲気中で加圧焼結した後、熱間等方加圧焼結(HIP)を行なうことで、直径が152.4mm、厚みが3mmの磁気ヘッド用基板である試料No.26〜30,32〜35,37〜39を作製した。
まず、Al2O3粉末、TiC粉末、TiO2粉末、Yb2O3粉末、成形用結合剤および分散剤を所定量混合し、スラリーを作製した。このスラリーを噴霧乾燥機に投入して、顆粒とした後、乾式加圧成形にて成形体を得た。次に、この成形体を図8に示すような段積み状態で20段配置し、アルゴン雰囲気中で加圧焼結した後、熱間等方加圧焼結(HIP)を行なうことで、直径が152.4mm、厚みが3mmの磁気ヘッド用基板である試料No.42〜46,48〜50を作製した。
2a、b:外部TiC結晶粒子
3a〜3d:内部TiC結晶粒子
10:磁気ヘッド用基板
20:磁気ヘッド
21:スライダ
21a:浮上面
21b:流路面
22:絶縁膜
23:電磁変換素子
30:記録媒体駆動装置
31:ハードディスク
32:モータ
33:回転軸
34:ハブ
35:スペ−サ
36:クランプ
37:ネジ
38:シャーシ
39:キャリッジ
40:サスペンション
44:ラップ装置
45:ラップ盤
46:研磨液
47:容器
48:ラップ治具
49:セラミック焼結体
Claims (14)
- Al2O3結晶粒子と、該Al2O3結晶粒子の内部に存在する内部TiC結晶粒子と、該内部TiC結晶粒子以外の外部TiC結晶粒子とを有し、断面視において、全TiC結晶粒子の面積に対する外部TiC結晶粒子の面積比率が、80%以上99.7%以下であり、前記外部TiC結晶粒子は、主として前記Al 2 O 3 結晶粒子に接触して存在するとともに、前記セラミック焼結体に対する全TiCの含有量が36質量%以上50質量%以下であることを特徴とするセラミック焼結体。
- 前記Al2O3結晶粒子の平均結晶粒径が1.5μm以下、外部TiC結晶粒子の平均結晶粒径が0.6μm以下であることを特徴とする請求項1に記載のセラミック焼結体。
- 前記Al2O3結晶粒子の平均結晶粒径に対する外部TiC結晶粒子の平均結晶粒径比率が、45%以上95%以下であることを特徴とする請求項1または請求項2に記載のセラミック焼結体。
- 熱伝導率が21W/(m・K)以上であることを特徴とする請求項1乃至請求項3のいずれかに記載のセラミック焼結体。
- 請求項1乃至請求項4のいずれかに記載のセラミック焼結体からなることを特徴とする磁気ヘッド用基板。
- 前記磁気ヘッド用基板の両主面部および厚み方向の中央部における前記TiCの格子定数の差が1×10−4nm以下であることを特徴とする請求項5に記載の磁気ヘッド用基板。
- 前記磁気ヘッド用基板の両主面部および中央部における前記TiCの格子定数が0.43150nm以上0.43168nm以下であることを特徴とする請求項5または請求項6に記載の磁気ヘッド用基板。
- 前記Al2O3を60質量%以上65質量%以下、前記TiCを35質量%以上40質量%以下の範囲であることを特徴とする請求項5乃至請求項7のいずれかに記載の磁気ヘッド用基板。
- 抗折強度が700MPa以上であることを特徴とする請求項5乃至請求項8のいずれかに記載の磁気ヘッド用基板。
- 前記磁気ヘッド用基板の両主面部および厚み方向の中央部における密度の差が0.004g/cm3以下であることを特徴とする請求項5乃至請求項9のいずれかに記載の磁気ヘッド用基板。
- 前記磁気ヘッド用基板は、密度が4.326g/cm3以上であることを特徴とする請求項5乃至請求項10のいずれかに記載の磁気ヘッド用基板。
- 請求項5乃至請求項11のいずれかに記載の磁気ヘッド用基板をチップ状に分割してなる各スライダに電磁変換素子を備えてなることを特徴とする磁気ヘッド。
- 前記各スライダは、浮上面と空気を通す流路面とを有しており、該流路面は、算術平均高さ(Ra)が25nm以下であることを特徴とする請求項12に記載の磁気ヘッド。
- 請求項13に記載の磁気ヘッドと、該磁気ヘッドによって情報の記録および再生を行なう磁気記録層を有する記録媒体と、該記録媒体を駆動させるモータと、を備えてなることを特徴とする記録媒体駆動装置。
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PCT/JP2007/071653 WO2008056710A1 (fr) | 2006-11-07 | 2007-11-07 | Frittage céramique, substrat de tête magnétique et tête magnétique utilisant le frittage céramique, et unité d'entraînement de support d'enregistrement |
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JPH0543311A (ja) * | 1991-08-01 | 1993-02-23 | Denki Kagaku Kogyo Kk | セラミツクス材料及び薄膜磁気ヘツド用セラミツクス基板 |
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JP2000103667A (ja) | 1998-09-30 | 2000-04-11 | Kyocera Corp | Al2O3−TiC系焼結体及びこれを用いた薄膜磁気ヘッド用基板 |
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JP4646548B2 (ja) * | 2004-05-28 | 2011-03-09 | 京セラ株式会社 | Al2O3系セラミックスの製造方法 |
JP4624139B2 (ja) * | 2005-03-08 | 2011-02-02 | 京セラ株式会社 | 磁気ヘッド用基板の製造方法 |
JP4025791B2 (ja) * | 2005-06-27 | 2007-12-26 | Tdk株式会社 | 磁気ヘッドスライダ用材料、磁気ヘッドスライダ、及び磁気ヘッドスライダ用材料の製造方法 |
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JPH0543311A (ja) * | 1991-08-01 | 1993-02-23 | Denki Kagaku Kogyo Kk | セラミツクス材料及び薄膜磁気ヘツド用セラミツクス基板 |
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