JPH087849B2 - Non-magnetic substrate for magnetic head - Google Patents
Non-magnetic substrate for magnetic headInfo
- Publication number
- JPH087849B2 JPH087849B2 JP1214207A JP21420789A JPH087849B2 JP H087849 B2 JPH087849 B2 JP H087849B2 JP 1214207 A JP1214207 A JP 1214207A JP 21420789 A JP21420789 A JP 21420789A JP H087849 B2 JPH087849 B2 JP H087849B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- substrate
- coefficient
- thermal expansion
- head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Magnetic Heads (AREA)
- Thin Magnetic Films (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、金属性磁性膜を蒸着するための非磁性の磁
気ヘッド用非磁性基板に関するものである。TECHNICAL FIELD The present invention relates to a non-magnetic substrate for a non-magnetic magnetic head for depositing a metallic magnetic film.
従来技術 従来この種の用途のものとしては、チタン酸バリウ
ム、チタン酸カルシウム、アルミナ等が使用されてい
た。しかしながら、その熱膨張率が磁性膜構造体と大き
く異なっていたため、蒸着した磁性膜構造体が剥離しや
すく、また熱膨張率の差により応力が発生しクラックが
発生することがあった。2. Description of the Related Art Conventionally, barium titanate, calcium titanate, alumina, etc. have been used for this type of application. However, since the coefficient of thermal expansion was largely different from that of the magnetic film structure, the vapor-deposited magnetic film structure was easily peeled off, and stress was generated due to the difference in the coefficient of thermal expansion, and cracks were sometimes generated.
さらに、従来の材料は硬さが低く、特に高保磁力テー
プ（いわゆるメタルテープ）が使用された場合には、非
磁性基板が磁性膜構造体と硬度及び耐摩耗性が異なり、
磁気テープとの摺動により発生する摩擦のために偏摩耗
等を引き起こし、磁気特性に変化をきたすという問題が
あった。特に硬度が低い場合には、磁気ヘッドの寿命が
短くなること、あるいは非磁性基板の変形や割れ及び剥
離を引き起こすといった欠点が顕著であった。Furthermore, the conventional material has low hardness, and especially when a high coercive force tape (so-called metal tape) is used, the non-magnetic substrate is different from the magnetic film structure in hardness and wear resistance,
There is a problem in that the friction generated by sliding on the magnetic tape causes uneven wear and the like, resulting in changes in magnetic characteristics. Particularly when the hardness is low, the shortcomings of shortening the life of the magnetic head and causing deformation, cracking and peeling of the non-magnetic substrate are remarkable.
本発明者等は、上記の欠点を解決すべく、CoO−NiO系
セラミックスについて従来より研究を進め、CoxNi2-xO2
（ただし0.2≦ｘ≦1.8）なる組成の酸化物が有効である
として既に開示した。The present inventors have, to solve the above drawbacks, studying conventionally for CoO-NiO ceramics, CoxNi 2- xO 2
It has already been disclosed that an oxide having a composition of (0.2 ≦ x ≦ 1.8) is effective.
しかし、金属性磁性膜構造体の製造工程やその用途に
よっては、より高い熱膨張率を有する非磁性基板が必要
となってきた。However, a nonmagnetic substrate having a higher coefficient of thermal expansion has been required depending on the manufacturing process of the metallic magnetic film structure and its application.
発明が解決しようとする問題点 本発明は、上記の欠点を解決したもので、具体的には
150x10-7/℃以上の熱膨張率を有し、ピッカース硬度500
〜700の特性を持ち、さらに他のヘッド構成材料間で過
度の化学的侵食反応を起こさない材料を提供することが
目的である。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention solves the above-mentioned drawbacks, and specifically,
Has a coefficient of thermal expansion of 150x10 -7 / ℃ or more, Pickers hardness 500
It is an object of the present invention to provide a material which has a characteristic of ~ 700 and which does not cause an excessive chemical erosion reaction between other head constituent materials.
発明の構成 即ち、本発明は、CoxNi2-xO2（ただし０＜ｘ＜0.2）
で表わされ、岩塩型構造を有することを特徴とする磁気
ヘッド用非磁性基板に関する。Configuration of the Invention Namely, the present invention is, CoxNi 2- xO 2 (provided that 0 <x <0.2)
The present invention relates to a non-magnetic substrate for a magnetic head, which has a rock salt structure.
問題点を解決するための手段及び作用 本発明者等は、CoO−NiO系セラミックスについて従来
より研究を進めてきたが、上記の観点から検討を加え、
基本組成としてCoxNi2-xO2（ただし０＜ｘ＜0.2）なる
組成の酸化物が有効であることを見い出した。Means and Actions for Solving Problems The inventors of the present invention have been researching CoO-NiO ceramics from the past, but from the above viewpoint, the investigations were added,
CoxNi 2- xO 2 (provided that 0 <x <0.2) comprising an oxide composition was found to be effective as a basic composition.
CoO−NiO系セラミックスにおいて、熱膨張率は次式に
よってほぼ決定される。In CoO-NiO ceramics, the coefficient of thermal expansion is almost determined by the following equation.
α（CN）＝α（Ｃ）Ｍ（Ｃ）＋α（Ｎ）Ｍ（Ｎ） （ただし、αは熱膨張率、Ｍはモル分率を示し、（ ）
内のＣはCoO、ＮはNiO、CNはCoO−NiO系であることを表
わす。）この式を適用すると、150x10-7/℃以上の熱膨
張率を得るには、本発明の組成比（０＜ｘ＜0.2）が必
要となる。α (CN) = α (C) M (C) + α (N) M (N) (where α is the coefficient of thermal expansion, M is the mole fraction, and ()
In the table, C represents CoO, N represents NiO, and CN represents CoO-NiO system. ) When this formula is applied, the composition ratio (0 <x <0.2) of the present invention is required to obtain a coefficient of thermal expansion of 150 × 10 −7 / ° C. or more.
市販の各酸化物を原料として、所望組成になるよう秤
量し、ボールミルにより混合する。混合は例えばエタノ
ール中湿式ボールミルで10〜30時間行なう。Each commercially available oxide is used as a raw material, weighed to have a desired composition, and mixed by a ball mill. Mixing is carried out, for example, in a wet ball mill in ethanol for 10 to 30 hours.
乾燥後、CIP成形し、例えばAr中850〜1100℃で仮焼
し、次いで粗砕機を用いて粉砕し、100〜200μｍの篩で
篩分けを行なう。After drying, it is CIP molded, calcined in Ar at 850 to 1100 ° C., then crushed using a coarse crusher, and sieved with a 100 to 200 μm sieve.
仮焼粉はさらに例えばエタノール中湿式ボールミルで
20〜72時間処理し、１μｍ以下に微粉砕する。The calcined powder may be further wet-milled in ethanol, for example.
Treat for 20 to 72 hours and pulverize to 1 μm or less.
これを造粒後、CIP成形し、例えばN2中1230〜1400℃
で焼結し、その後、HIP処理を行なう。HIP処理条件は、
800〜1200kg/cm2、1200〜1350℃、１〜２時間が望まし
い。After granulating this, CIP molding, for example 1230 ~ 1400 ℃ in N 2
Sintered, and then HIPed. HIP processing conditions are
800 to 1200 kg / cm 2 , 1200 to 1350 ° C., 1 to 2 hours are desirable.
このようにして得られた焼結体は、緻密で岩塩型構造
を有し、テープの摺動による摩擦やエッヂ部の欠けが少
なく従来の材料よりも優れていることが確認できた。It was confirmed that the thus-obtained sintered body had a dense and rock-salt type structure, less friction due to the sliding of the tape and chipping of the edge portion, and was superior to conventional materials.
また、CoxNi2-xO2（ただし0.2≦ｘ≦1.8）の場合と同
様、MnO、TiO2、Al2O3、CaO、Y2O3、TiN、B2O3、SiO2等
の添加材が有効である。Also, as in the case of CoxNi 2 -xO 2 (however, 0.2 ≦ x ≦ 1.8), additives such as MnO, TiO 2 , Al 2 O 3 , CaO, Y 2 O 3 , TiN, B 2 O 3 and SiO 2 are added. Is effective.
添加は、単独あるいは各々の組み合わせでも良好であ
り、所望の硬度、熱膨張率に対応した組み合わせを採用
するのが望ましい 実施例 組成式CoxNi2-xO2で表わされる酸化物のうち、表１の組
成のものをNiO、CoOより調整した。混合は、エタノール
中湿式ボールミルで22時間処理した。The addition may be performed singly or in combination with each other, and it is desirable to adopt a combination corresponding to a desired hardness and coefficient of thermal expansion. Examples Of oxides represented by the composition formula CoxNi 2 -xO 2 , The composition was adjusted from NiO and CoO. Mixing was done in a wet ball mill in ethanol for 22 hours.
乾燥後、CIP成形し、Ar中1000℃で仮焼後、150μｍ以
下に粉砕した。After drying, it was CIP molded, calcined in Ar at 1000 ° C., and then pulverized to 150 μm or less.
仮焼粉をさらにエタノール中湿式ボールミルで70時間
処理し、１μｍ以下に微粉砕した。The calcined powder was further treated with a wet ball mill in ethanol for 70 hours and finely pulverized to 1 μm or less.
これを造粒後、CIP成形し、N2中1400℃で焼結した。
なお、HIP処理を行なわなくとも焼結体の密度は高い値
であった。After granulating this, it was CIP molded and sintered at 1400 ° C. in N 2 .
The density of the sintered body was a high value even without HIP treatment.
焼結体のＸ線回折より、岩塩型構造であることを確認
した。It was confirmed by X-ray diffraction of the sintered body that it had a rock salt type structure.
焼結体のピッカース硬度（Hv）、熱膨張率（α：×10
-7/℃）を表１に示す。表中には、比較例としてチタン
酸バリウム（チタバリ）の特性を併記した。Pickers hardness (Hv) and coefficient of thermal expansion (α: × 10)
-7 / ° C) is shown in Table 1. In the table, the characteristics of barium titanate (Citabari) are also shown as a comparative example.
発明の効果 以上説明したように、（１）本組成の非磁性基板は、
熱膨張率、硬度とも磁性膜構造体とほぼ同等の特性を得
ることができる。 EFFECTS OF THE INVENTION As described above, (1) the non-magnetic substrate of the present composition is
Both the coefficient of thermal expansion and the hardness of the magnetic film structure can be obtained.
このため、磁性膜構造体の剥離やクラックの発生を著
しく防止できる。Therefore, the peeling of the magnetic film structure and the occurrence of cracks can be significantly prevented.
（２）さらに、硬度を高めることにより磁気ヘッドの短
寿命化や非磁性基板の変形、割れ等を抑えることがで
き、ヘッドの耐摩耗性、耐久性に特にすぐれている利点
がある。(2) Further, by increasing the hardness, it is possible to shorten the life of the magnetic head and suppress the deformation and cracking of the non-magnetic substrate, and there is an advantage that the wear resistance and durability of the head are particularly excellent.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−94408（ＪＰ，Ａ) 特開 平２−94407（ＪＰ，Ａ) 特開 平１−287811（ＪＰ，Ａ) 特開 平２−168602（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-2-94408 (JP, A) JP-A-2-94407 (JP, A) JP-A 1-287811 (JP, A) JP-A-2- 168602 (JP, A)
Claims (1)
され、岩塩型構造を有することを特徴とする磁気ヘッド
用非磁性基板。1. A represented by CoxNi 2- xO 2 (provided that 0 <x <0.2), the non-magnetic substrate for a magnetic head is characterized in that it has a rock-salt structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1214207A JPH087849B2 (en) | 1989-08-22 | 1989-08-22 | Non-magnetic substrate for magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1214207A JPH087849B2 (en) | 1989-08-22 | 1989-08-22 | Non-magnetic substrate for magnetic head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0380412A JPH0380412A (en) | 1991-04-05 |
| JPH087849B2 true JPH087849B2 (en) | 1996-01-29 |
Family
ID=16652007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1214207A Expired - Lifetime JPH087849B2 (en) | 1989-08-22 | 1989-08-22 | Non-magnetic substrate for magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH087849B2 (en) |
-
1989
- 1989-08-22 JP JP1214207A patent/JPH087849B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0380412A (en) | 1991-04-05 |
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