JPH02283654A - Ceramic composition for magnetic head - Google Patents
Ceramic composition for magnetic headInfo
- Publication number
- JPH02283654A JPH02283654A JP1106934A JP10693489A JPH02283654A JP H02283654 A JPH02283654 A JP H02283654A JP 1106934 A JP1106934 A JP 1106934A JP 10693489 A JP10693489 A JP 10693489A JP H02283654 A JPH02283654 A JP H02283654A
- Authority
- JP
- Japan
- Prior art keywords
- thermal expansion
- composition
- mol
- magnetic head
- magnetic
- 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.)
- Granted
Links
- 239000000203 mixture Substances 0.000 title abstract description 34
- 239000000919 ceramic Substances 0.000 title description 11
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract description 14
- 239000013078 crystal Substances 0.000 abstract description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052593 corundum Inorganic materials 0.000 abstract description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 4
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc oxide Inorganic materials [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 239000002075 main ingredient Substances 0.000 abstract 1
- VASIZKWUTCETSD-UHFFFAOYSA-N manganese(II) oxide Inorganic materials [Mn]=O VASIZKWUTCETSD-UHFFFAOYSA-N 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 229910000859 α-Fe Inorganic materials 0.000 description 14
- 229910052573 porcelain Inorganic materials 0.000 description 13
- 239000000463 material Substances 0.000 description 7
- 239000000696 magnetic material Substances 0.000 description 5
- 239000011162 core material Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 108091006629 SLC13A2 Proteins 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- BYFGZMCJNACEKR-UHFFFAOYSA-N aluminium(i) oxide Chemical compound [Al]O[Al] BYFGZMCJNACEKR-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000001513 hot isostatic pressing Methods 0.000 description 2
- 229910018605 Ni—Zn Inorganic materials 0.000 description 1
- 229910010252 TiO3 Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Landscapes
- Magnetic Heads (AREA)
- Hard Magnetic Materials (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
Abstract
Description
【発明の詳細な説明】
利用産業分野
この発明は、磁気ヘッドの構造部品に用いる非磁性材料
に係り、コンピュータ等の各種磁気ヘッド、特にデジタ
ル記録用フェライト磁気ヘッドの構成に不可欠のスライ
ダーあるいはスペーサーに使用する熱膨張係数（α）が
１２０×１０−７／℃以上であることを特徴とする磁気
ヘッド用磁器組成物に関する。[Detailed Description of the Invention] Field of Application This invention relates to non-magnetic materials used for structural parts of magnetic heads, and is particularly applicable to sliders or spacers essential to the construction of various magnetic heads such as computers, especially ferrite magnetic heads for digital recording. The present invention relates to a ceramic composition for a magnetic head, which has a coefficient of thermal expansion (α) of 120×10 −7 /° C. or more.
従来技術
一般にフェライト磁気ヘッドは、Ｍｎ−Ｚｎフェライト
、Ｎｉ−Ｚｎフェライトの磁性材料からなるコアと非磁
性材料からなる構造部品とをガラス溶着して組立てられ
ており、特にデジタル用磁気ヘッドには磁性材料として
、飽和磁束密度
Ｂｓ ＝ ４５００Ｇ程度で透磁率の高いＭｎ−Ｚｎフ
ェライト（熱膨張係数α＝ １０６×１０−７／’Ｃ）
が使用され、非磁性構造部品材料には熱膨張係数が上記
フェライトと同等のＴｉＯ２−ＣａＯ系磁器が使用され
ている。Conventional technology In general, a ferrite magnetic head is assembled by glass-welding a core made of a magnetic material such as Mn-Zn ferrite or Ni-Zn ferrite and a structural part made of a non-magnetic material. The material is Mn-Zn ferrite, which has a saturation magnetic flux density Bs = approximately 4500G and high magnetic permeability (thermal expansion coefficient α = 106 x 10-7/'C).
is used, and TiO2--CaO-based porcelain whose coefficient of thermal expansion is equivalent to that of the above-mentioned ferrite is used as the non-magnetic structural component material.
最近、磁気ヘッド特性向上のため、さらに−段と磁気特
性のすぐれたＢｓ＝５１００Ｇ程度、硬度Ｈｖ＝６５０
以上のＭｎ−Ｚｎフェライトが使用されるようになった
。Recently, in order to improve the magnetic head characteristics, the magnetic characteristics are even better, Bs = 5100G, hardness Hv = 650.
The above Mn-Zn ferrites have come to be used.
しかしながら、前記の高性能Ｍｎ−Ｚｎフェライトは熱
膨張係数（Ｑ）が１２０×１０−７／ ”Ｃ以上であり
、非磁性構造部品材料にかかるフェライトの熱膨張係数
（α）に合致する磁器組成物が要望されてきた。However, the above-mentioned high-performance Mn-Zn ferrite has a thermal expansion coefficient (Q) of 120 x 10-7/''C or more, and a porcelain composition that matches the thermal expansion coefficient (α) of ferrite for non-magnetic structural component materials. Things have been requested.
すなわち、コア材と、非磁性構造部品との熱膨張係数が
異なると、これらをガラス溶着する際に、フェライトコ
アに応力が掛り、磁気特性の劣化が起こるだけでなく、
ひび、剥離等を生じて磁気ヘッドの組立上、大きな問題
となるため、磁性材料と非磁性材料の熱膨張係数が一致
するよう材料組成が選択されている。In other words, if the core material and the non-magnetic structural component have different coefficients of thermal expansion, stress will be applied to the ferrite core when glass welding them, which will not only cause deterioration of the magnetic properties, but also
Since cracks, peeling, etc. occur, which poses a serious problem when assembling the magnetic head, the material composition is selected so that the coefficients of thermal expansion of the magnetic material and the non-magnetic material match.
また、この非磁性構造部品材料に、結晶の脱落とかマイ
クロクラックが多く存在すると、磁気ヘッドと記録媒体
との接触走行時に、記録媒体にコーティングされた磁性
粉が上記欠陥に付着したり、チッピングを生じて磁気ヘ
ッドや記録媒体を損傷するため、かかる欠陥が機械加工
時に発生し易い材料であってはならない。In addition, if there are many falling crystals or microcracks in this non-magnetic structural component material, the magnetic powder coated on the recording medium may adhere to the defects or cause chipping when the magnetic head and the recording medium run in contact with each other. The material must not be susceptible to such defects during machining, since such defects may damage the magnetic head or recording medium.
発明の目的
この発明は、前記問題点解決のため、熱膨張係数ａ＝
１２０×１０’／”Ｃ以上、硬度Ｈｖ＝６５０程度の高
性能Ｍｎ−Ｚｎフェライトと同等の熱膨張係数を有し、
結晶組織の微細且つ緻密で、機械加工時にマイクロクラ
ック、あるいは結晶の脱落の極めて少ない磁器組成物の
提供を目的としている。Purpose of the Invention In order to solve the above-mentioned problems, the present invention provides a coefficient of thermal expansion a=
It has a thermal expansion coefficient equivalent to that of high-performance Mn-Zn ferrite with a hardness of 120×10'/”C or more and a hardness of about 650,
The object of the present invention is to provide a porcelain composition that has a fine and dense crystal structure and that causes very few microcracks or crystal dropouts during machining.
発明の概要
発明者は、熱膨張係数ａ＝１２０×１０−７／℃以上を
有し、硬度Ｈｖ＝６５０の高性能Ｍｎ−Ｚｎフェライト
と同等以上の熱膨張係数を有し、結晶組織の微細且つ緻
密で機械加工時にマイクロクラック、あるいは結晶の脱
落の極めて少ない磁器組成物について、種々検討した結
果、磁器組成物の熱膨張係数はその結晶構造に左右され
、ＮａＣ１型の構造をもつＮｉＯ、 ＭｇＯ１ＴｉＯ２
等は５０〜５００℃での熱膨張係数が１２５〜１４０×
１０−７／ ’Ｃという大きな値を有し、かつ緻密で硬
度等緒特性が磁気ヘッド用磁器組成物として適した値を
もつことに着目し、特にＮａＣ１型構造相をもつセラミ
ックスとして、特定の組成のＮｉＯ−ＭｇＯ−ＴｉＯ２
系がその目的に適することを知見した。Summary of the Invention The inventor has developed a material with a thermal expansion coefficient a = 120 x 10-7/°C or higher, which has a thermal expansion coefficient equal to or higher than that of high-performance Mn-Zn ferrite with a hardness Hv = 650, and has a fine crystal structure. As a result of various studies on porcelain compositions that are dense and have very few microcracks or crystal dropouts during machining, we found that the thermal expansion coefficient of porcelain compositions depends on their crystal structure, and that NiO, MgO1TiO2, which has a NaCl type structure,
The thermal expansion coefficient at 50-500℃ is 125-140×
Focusing on the fact that it has a large value of 10-7/'C, and has dense and homogeneous hardness characteristics suitable for a ceramic composition for magnetic heads, we have developed a specific ceramic composition with a NaC1 type structural phase. Composition of NiO-MgO-TiO2
It has been found that the system is suitable for the purpose.
すなわち、この発明は、
ＮｉＯ５０〜９０モル％、ＭｇＯ１０〜４０モル％、Ｔ
ｉＯ２１０〜２０モル％からなり、熱膨張係数α＝ １
２０×１０−７／℃以上で、硬度Ｈｖ ＝ ７００以上
の結晶組織の微細且つ緻密な磁器組成物であり、さらに
、
前記磁器組成物に、ＮｉＯ、 ＭｇＯ，ＴｉＯ２の合計
量１００に対してＡｌ２Ｏ３、Ｆｅ２Ｏ３、ＺｎＯ１Ｍ
ｎ０１ＳｉＯ２の少なくとも１種を５ｗｔ％以下含有し
た、熱膨張係数ａ＝ １２０×１０−７／ ’Ｃ以上、
硬度Ｈｖ＝７００以上の結晶組織の微細且つ緻密な磁器
組成物である。That is, this invention includes NiO 50 to 90 mol%, MgO 10 to 40 mol%, T
Consists of iO2 10-20 mol%, thermal expansion coefficient α = 1
It is a fine and dense porcelain composition with a crystal structure of 20×10-7/°C or higher and a hardness Hv = 700 or higher, and the ceramic composition further includes Al2O3 per 100% of the total amount of NiO, MgO, and TiO2. , Fe2O3, ZnO1M
Thermal expansion coefficient a = 120 × 10-7 / 'C or more, containing at least 5 wt% of at least one type of n01SiO2,
It is a fine and dense porcelain composition with a hardness Hv of 700 or more and a crystal structure.
発明の構成と効果
この発明による特定の組成を有する
ＮｉＯ−ＭｇＯ−ＴｉＯ２系セラミツクスは、ＮａＣ１
型構造を有する固溶体、（Ｎｔｚ−Ｍｇ１−、）Ｑ及び
（Ｎｔｙ・Ｍｇ１−、）ＴｉＯ３の２相からなることは
Ｘ線回折法により確認され、この相中の（Ｎｉｚ・Ｍｇ
１−ｘ）Ｏの存在が、ＮｉＯＮｌｏｌ、 ＴｉＯ２系セ
ラミックスの熱膨張係数を高めることに寄与し、
また、（Ｎｉｙ・Ｍｇｔ−ｙ）ＴｉＯａが混在すること
により、このセラミックスが緻密化することが分った。Structure and Effects of the Invention The NiO-MgO-TiO2 ceramics having a specific composition according to the present invention has NaC1
It was confirmed by X-ray diffraction that it is a solid solution with a type structure, consisting of two phases: (Ntz-Mg1-,)Q and (Nty・Mg1-,)TiO3.
It has been found that the presence of 1-x)O contributes to increasing the thermal expansion coefficient of NiONlol and TiO2-based ceramics, and that the presence of (Niy・Mgt-y)TiOa makes these ceramics denser. It was.
この発明の磁器組成物の熱膨張係数αが１２０〜１３０
×１０−７／ ’Ｃとなり、前述したＢｓ＝５１００Ｇ
程度、硬度Ｈｖ＝６５０の高性能Ｍｎ −Ｚｎフェライ
トの熱膨張係数に合致するため、ガラス溶着の際の応力
の負荷がなく、磁気特性の劣化が生ぜず、ひび、剥離等
の問題も招来することなく、また、この発明による磁器
組成物の硬度Ｈｖが７００〜１０００となり、Ｍｎ −
Ｚｎフェライトコアの硬度に近似するため、磁気ヘッド
の摺動面に段差を生じない利点がある。The thermal expansion coefficient α of the porcelain composition of this invention is 120 to 130
×10-7/'C, and the aforementioned Bs = 5100G
Since it matches the thermal expansion coefficient of high-performance Mn-Zn ferrite with a hardness of Hv=650, there is no stress load during glass welding, and no deterioration of magnetic properties occurs, leading to problems such as cracking and peeling. Moreover, the hardness Hv of the porcelain composition according to the present invention is 700 to 1000, and the Mn −
Since the hardness is close to that of a Zn ferrite core, it has the advantage of not creating a step on the sliding surface of the magnetic head.
組成の限定理由
この発明による磁器組成物の組成を限定した理由を以下
に説明する。Reason for Limiting the Composition The reason for limiting the composition of the ceramic composition according to the present invention will be explained below.
ＮｉＯが５０モル％未満では、熱膨張係数αが１２０×
１０−７／℃未満に低下して、目的とする磁気ヘッド用
としては好ましくなく、また、９０モル％を超えると、
゛磁器組成物内に気孔が増加して、耐摩耗性が低下し、
また、加工性も劣化するので好ましくない。When NiO is less than 50 mol%, the thermal expansion coefficient α is 120×
If it decreases to less than 10-7/°C, it is not suitable for the intended magnetic head, and if it exceeds 90 mol%,
``Pores increase in the porcelain composition, reducing wear resistance,
In addition, processability is also deteriorated, which is not preferable.
また、ＭｇＯが１０モル％未満では、緻密な磁器組成物
が得られず好ましくなく、４０モル％を超えると、熱膨
張係数が１２０×１０−７／’Ｃ未満に低下するので好
ましくない。Further, if MgO is less than 10 mol%, a dense ceramic composition cannot be obtained, which is not preferable, and if it exceeds 40 mol%, the thermal expansion coefficient decreases to less than 120 x 10-7/'C, which is not preferable.
ＴｉＯ２が１０モル％未満では、磁器組成物内に気孔が
増加して、耐摩耗性、加工性の劣化を招来し、２０モル
％を超えると、熱膨張係数が１２０×１０−７／℃未満
に低下し、磁気ヘッド用としては好ましくないので、Ｎ
ｉＯ５０〜９０モル％、ＭｇＯ１０〜４０モル％、Ｔｉ
Ｏ２１０〜２０モル％の組成に限定する。If TiO2 is less than 10 mol%, pores will increase in the porcelain composition, resulting in deterioration of wear resistance and workability, and if it exceeds 20 mol%, the thermal expansion coefficient will be less than 120 x 10-7/°C. N
iO 50-90 mol%, MgO 10-40 mol%, Ti
The composition is limited to 10 to 20 mol% O2.
また、添加物のＡｌ２Ｏ３、Ｆｅ２Ｏ３、ＺｎＯ，Ｍｎ
０１ＳｉＯ２は磁器組成物の緻密化に効果があるが、そ
の添加量が５ｗｔ％を超えると、緻密化の効果が飽和し
、特にＡｌ２Ｏ３の場合、熱膨張係数ｑが１２０×１０
−７／℃未満に低下するので好ましくない。In addition, additives Al2O3, Fe2O3, ZnO, Mn
01SiO2 is effective in densifying the ceramic composition, but when the amount added exceeds 5 wt%, the densification effect is saturated, and especially in the case of Al2O3, the thermal expansion coefficient q is 120 x 10
This is not preferable because it decreases to less than -7/°C.
実施例
市販されているＮｉＯＮｌｏｌ、 ＴｉＯ２、Ａｌ２Ｏ
３、Ｆｅ２Ｏ３、ＺｎＯ，ＭｎＯ，５ｉＯ２を用いて、
第１表に示す如く、熱間静水圧プレス処理後の組成がこ
の発明による組成（Ｎｏ、１〜９）、及びこの発明の範
囲外の組成（Ｎｏ、１０〜１２）となるように、秤量し
、ボールミルで６時間混合し、乾燥した後、仮焼、微粉
砕、造粒後に１．５Ｔ／ｃｍ２の成形圧で
２８ｍｍＸ２８ｍｍＸ １５ｍｍ寸法に成形し、第１表
に表した焼結条件、及びＨＩＰ（熱間静水圧プレス）条
件で磁器組成物を製造した。Examples Commercially available NiONlol, TiO2, Al2O
3. Using Fe2O3, ZnO, MnO, 5iO2,
As shown in Table 1, weighed so that the composition after hot isostatic pressing was the composition according to the present invention (No. 1 to 9) and the composition outside the scope of the present invention (No. 10 to 12). After mixing in a ball mill for 6 hours, drying, calcining, finely pulverizing, and granulating, the mixture was molded into a size of 28 mm x 28 mm x 15 mm at a molding pressure of 1.5 T/cm2, and sintered under the conditions shown in Table 1 and HIP. A porcelain composition was produced under (hot isostatic pressing) conditions.
得られた磁器について、その密度、気孔率、熱膨張係数
、ビッカース硬度の各特性を調べ、その結果を第１表に
表す。The obtained porcelain was examined for its density, porosity, coefficient of thermal expansion, and Vickers hardness, and the results are shown in Table 1.
以下余白Margin below
Claims (1)
、ＴｉＯ＿２ １０〜２０モル％からなり、熱膨張係数
（α）が１２０×１０＾−＾７／℃以上であることを特
徴とする磁気ヘッド用磁気組成物。 ２ ＮｉＯ ５０〜９０モル％、ＭｇＯ １０〜４０モル％
、ＴｉＯ＿２ １０〜２０モル％からなり、ＮｉＯ、Ｍ
ｇＯ、ＭｇＯの合計量１００に対して、Ａｌ＿２Ｏ＿３
、Ｆｅ＿２Ｏ＿３、ＺｎＯ、ＭｎＯ、ＳｉＯ＿２の少な
くとも１種を５ｗｔ％以下含有し、熱膨張係数（α）が
１２０×１０＾−＾７／℃以上であることを特徴とする
磁気ヘッド用磁器組成物。[Claims] 1 NiO 50-90 mol%, MgO 10-40 mol%
, TiO_2 10 to 20 mol %, and has a coefficient of thermal expansion (α) of 120×10^-^7/°C or more. 2 NiO 50-90 mol%, MgO 10-40 mol%
, TiO_2 10 to 20 mol%, NiO, M
For the total amount of gO and MgO 100, Al_2O_3
, Fe_2O_3, ZnO, MnO, and SiO_2 in an amount of 5 wt% or less, and has a coefficient of thermal expansion (α) of 120×10^-^7/°C or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1106934A JPH02283654A (en) | 1989-04-25 | 1989-04-25 | Ceramic composition for magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1106934A JPH02283654A (en) | 1989-04-25 | 1989-04-25 | Ceramic composition for magnetic head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02283654A true JPH02283654A (en) | 1990-11-21 |
| JPH0581550B2 JPH0581550B2 (en) | 1993-11-15 |
Family
ID=14446229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1106934A Granted JPH02283654A (en) | 1989-04-25 | 1989-04-25 | Ceramic composition for magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02283654A (en) |
-
1989
- 1989-04-25 JP JP1106934A patent/JPH02283654A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0581550B2 (en) | 1993-11-15 |
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