JPH022820B2 - - Google Patents
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- Publication number
- JPH022820B2 JPH022820B2 JP60043537A JP4353785A JPH022820B2 JP H022820 B2 JPH022820 B2 JP H022820B2 JP 60043537 A JP60043537 A JP 60043537A JP 4353785 A JP4353785 A JP 4353785A JP H022820 B2 JPH022820 B2 JP H022820B2
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- 239000000463 material Substances 0.000 claims description 56
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 22
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 19
- 229910018068 Li 2 O Inorganic materials 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 7
- 239000010409 thin film Substances 0.000 description 21
- 239000000843 powder Substances 0.000 description 11
- 239000002184 metal Substances 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 9
- 229910000859 α-Fe Inorganic materials 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 238000005245 sintering Methods 0.000 description 7
- 239000002994 raw material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 229910000889 permalloy Inorganic materials 0.000 description 3
- 229910001035 Soft ferrite Inorganic materials 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000001513 hot isostatic pressing Methods 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 229910000702 sendust Inorganic materials 0.000 description 2
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 description 1
- 229910018605 Ni—Zn Inorganic materials 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Magnetic Heads (AREA)
Description
利用産業分野
この発明は、磁気デイスク用スライダー材料や
磁気テープ用耐摩耗性機能部材料に係り、記録媒
体とのなじみや潤滑性にすぐれ、金属薄膜との熱
的整合性、被着強度にすぐれた磁気ヘツド・スラ
イダー用材料に関する。
背景技術
これまでコンピユーター用を始めオーデイオ
用、VTR用等の記録再生用磁気ヘツド、スライ
ダーには、多結晶Ni―Znフエライト、Mn―Zn
フエライトや単結晶Mn―Znフエライトあるいは
高硬度パーマロイなどが用いられていた。
今日では記録密度の高密度化並びに耐摩耗特性
の改善が切望されており、一層、薄膜磁気ヘツド
化が進められている。この薄膜磁気ヘツド化にと
もない、記録再生のための磁気回路部材用材料と
耐摩耗性スライダー材料の各々に、それぞれに要
求される特性を満足した最適の材料が選定されつ
つある。
すなわち、磁気回路用としては、高周波域の磁
気特性がすぐれたパーマロイ，センダストあるい
はアモルフアスの薄膜を使用し、一方、耐摩耗性
が要求される機能部材用としてはアルミナ系材料
が望ましいと考えられている。
かかる耐摩耗性摺動部材用材料は、非磁性材料
であるが、耐摩耗性を始め精密加工性、加工能
率、高強度、組織の緻密性、さらには記録媒体と
のなじみ、潤滑性、金属薄膜との熱的整合性や被
着強度などの諸特性が要求されている。
従来、磁気ヘツド・スライダー用材料として、
Al2O3―TiC材料（特開昭55―163665号公報）は、
種々の特性がすぐれ、かかる耐摩耗性機能部材に
最適の材料の１つであるが、記録媒体とのなじ
み，潤滑性の点では必ずしも安定した材料とはい
えず、Al2O3―TiC系材料の熱膨脹係数も、7.5〜
8.0×10-6／℃であり、また、Al2O3―TiC系材料
の記録媒体とのなじみや潤滑性を改善した磁気ヘ
ツド・スライダー用材料として、TiO2―Al2O3系
材料（特開昭57―198578号公報）が提案され、多
くの面で極めてすぐれた特性を有し、該耐摩耗性
機能部材材料に最適な材料の１つであるが、
TiO2―Al2O3系材料の熱膨脹係数は、7.5〜8.5×
10-6／℃であり、これら材料表面に金属薄膜等を
形成させた場合は、機能部材と薄膜との熱膨脹係
数差が大きく、熱的整合性及び被着強度の面で改
良すべき課題となつていた。かかる材料表面に形
成する各種薄膜との熱的整合性及び被着強度を高
めるための特性を機能部材に付与することが求め
られている。
発明の目的
この発明は、磁気ヘツド・スライダーの耐摩耗
性機能部材に要求される、耐摩耗性を始め、精密
加工性、加工能率、高強度、組織の緻密性、記録
媒体とのなじみ，潤滑性などの諸特性を満足し、
特に、金属薄膜との熱的整合性や被着強度にすぐ
れた特性を有する磁気ヘツド・スライダー用材料
を目的としている。
発明の構成と効果
この発明は、上述の問題点に鑑み、金属薄膜と
の熱的整合性や被着強度にすぐれた磁気ヘツド・
スライダー用材料を種々検討した結果、TiO2―
Al2O3―Li2O系にZrO2を特定量含有させることに
より、磁気ヘツド・スライダーの耐摩耗性機能部
材に要求される諸特性を満足し、金属薄膜との熱
的整合性や被着強度にすぐれた材料が得られるこ
とを知見したものである。
すなわち、この発明は、TiO2 20wt％〜60wt
％、Al2O3 5wt％〜75wt％、Li2O 5wt％〜35wt
％からなる組成100重量部に対し、ZrO2 0.2重量
部〜10重量部を含有したことを特徴とする磁気ヘ
ツド・スライダー用材料である。
さらに詳述すれば、例えば、この発明による材
料は、TiO2 20wt％〜60wt％、Al2O3 5wt％〜
75wt％、Li2O 5wt％〜35wt％からなる組成100
重量部の高純度酸化物原料を粉砕、混合したの
ち、800℃〜1000℃にて焙焼し、さらに0.2重量部
〜10重量部の高純度ZrO2原料を加えて再粉砕し、
乾式プレス、湿式静水圧プレス、その他各種の成
形方法により成形し、成形体を大気雰囲気で1100
℃〜1300℃にて焼結するか、あるいはホツトプレ
ス法あるいは熱間静水圧プレス法にて焼結するこ
とにより得られる。
この発明によるTiO2―Al2O3―LiO―ZrO2系の
磁気ヘツド・スライダー用材料は、従来のフエラ
イト系材料とAl2O3―TiC系材料との中間材料と
して、かかる用途材料に要求される耐摩耗性を始
め、精密加工性、加工能率、高強度、組織の緻密
性などの諸特性を満足し、記録媒体とのなじみ、
潤滑性にすぐれるだけでなく、特に、被着する金
属薄膜に近い熱膨脹係数を有し、金属薄膜との熱
的整合性や被着強度に、従来材料にないすぐれた
性能を有する。
成分限定理由
この発明において、TiO2は、Al2O3とともに本
系材料の主成分であり、20wt％未満では、Al2O3
―TiO2系焼結体の硬度が高くなり、これまで磁
気ヘツドの磁気回路用材料として多用されてきた
ソフトフエライトとの硬度差が大きくなり、記録
媒体によつてはソフトフエライトの適用が困難と
なる場合があり、また、60wt％を超えると、空
孔が発生して磁気ヘツド用材料として不適なた
め、20wt％〜60wt％とする。
Li2Oは、TiO2―Al2O3系材料の熱膨脹係数を
大きくするために含有するが、Li2Oが5wt％未満
では、熱膨脹係数が９×10-6／deg未満となり、
磁性薄膜のパーマロイ、センダストとの熱膨脹係
数差が大きくなりすぎ、好ましくなく、また、
35wt％を超えると、熱膨脹係数が17×10-6／deg
を超え、前記薄膜との熱膨脹係数差が大きくなり
好ましくないため、5wt％〜35wt％とする。
Al2O3は、TiO2とともに本系材料の主成分であ
り、上記の如くTiO2及びLi2Oの含有範囲が限定
されることにより、5wt％〜75wt％の範囲とな
る。
ZrO2は、材料の記録媒体との潤滑性及び成形
体強度を向上させるために添加するが、TiO2、
Al2O3、Li2Oの合計100重量部に対して、0.2重量
部未満では、上記効果が少なく、本系組織の改善
並びに強度向上が得られず、成形品加工時に精密
加工が困難となり、また、10重量部を超える添加
は硬度を著しく低下させるとともに、金属薄膜と
の被着強度を著しく低下させ、薄膜磁気ヘツド材
料として不適となり、さらにZrO2にはAl2O3―
TiO2―Li2O結晶粒子の成長抑制効果があるが、
10重量部を超えると材料に亀裂を生じるため、
0.2重量部〜10重量部の添加とする。
なお、この発明において、ZrO2は、下記特性
の原料を用いても、初期目的を達成できる。
ZrO2粉末原料としては、安定化剤を含有しな
い末安定化粉末とY2O3、MgO、Ce2O3及びCaO
などで部分安定または安定化処理した粉末とがあ
り、いずれの粉末も用いることができる。
しかし、よりすぐれた材料を得るため、未安定
化ZrO2粉末を用いる場合は、純度が99.9％以上で
かつ平均粒度が0.1μm以下とし、最終的に正方晶
及び立方晶の状態で存在させることにより、組織
改善効果及び強度改善効果が得られる。
部分安定化あるいは安定化処理したZrO2粉末
を用いる場合は、1.5〜7mol％Y2O3―ZrO2系で、
不純物が0.1％以下，平均粒度0.3μm以下の粉末を
用いるのが、組織改善効果及び強度改善効果にお
いて最もよい結果が得られる。
さらに、基本組織のAl2O3の代りに、Al2O3の
一部をZrO2（未安定化、部分安定化、安定化）で
置換した原料を用いることにより、再粉砕時に
ZrO2の配合を省略することができる。
実施例
純度99.9％、平均粒度0.6μmのAl2O3、
純度99.9％、平均粒度0.3μmのTiO2、
純度99％、平均粒度1μmのLi2Oの各粉末を用
い、TiO255wt％―Al2O3 30wt％―Li2O15wt％
となるように配合し、ボールミルにて20時間の湿
式混合粉砕を行なつた。
次に、この混合粉末を乾燥させたのち、900℃
で熱処理し、この混合粉末100重量部に対して、
５重量部の平均粒度0.2μmのZrO2〔ZrO2―2.5mol
％Y2O3〕粉末を、ボールミルにて20時間の湿式
混合粉砕を行つて焼結用粉末を得た。
つぎに型枠内に上記焼結用粉末を充填し、1000
℃で、200Kg／cm2の圧力を加えて１時間保持した
のち、減圧して放冷し、寸法 50mm×50mm×5.5
mmの焼結体を得た。
この実施例による焼結体の物性値は以下のとお
りである。
ａ 比重；3.55
ｂ 硬度；HRA88.3
HV1290
ｃ 抗折力；30Kg／mm2
ｄ 熱伝導率；0.025Cal／cmsec℃
ｅ 電気抵抗；＜0.01Ω-cm以上
ｆ 熱膨脹係数；14×10-6／℃
また、上述組成の材料を大気雰囲気炉焼結、ホ
ツトプレス及び熱間静水圧プレスの各焼結方法に
より得たところ、材料の強度に関しては、焼結方
法によつて若干の差があり、加圧焼結品に強度の
高い材料が得られたが、熱膨脹係数の面では焼結
方法にあまり左右されず、材料の組成によりその
値が決定され、この発明組成材料は第１表の如
く、９〜17×10-6／℃の特性を示した。
また、各種薄膜を実施例及び第１表の各種材料
に被着形成した結果、当然のことながら、薄膜の
熱膨脹係数に近い材料との熱的整合性及び被着強
度が最もすぐれており、かつ低級酸化物が極微量
生成する焼結材料（加圧焼結品）のほうが薄膜と
の被着強度がすぐれていることが分つた。
次に、上記の焼結体を、ダイヤモンド砥石によ
り、２mm×４mm断面，長さ20mmの直方体となし、
その一方端を鋭角な刃状に成形した。さらに、外
径45mm×内径10mm×厚み10mmのドーナツ型円板の
フエライトを用い、この発明の焼結体と組合せ
て、回転するフエライトに焼結体の鋭角な刃先を
当接させて実施する、所謂ピン―デイスク方式の
摩耗試験を行なつた。
また、上記試験の際に、
従来のフエライト系材料（Mn―Zn多結晶フエ
ライト、MnO 32wt％、ZnO2 15wt％、Fe2O3
53wt％）、
Al2O3―TiC系焼結体
（Al2O3 70wt％、TiC 30wt％）、
TiO2―Al2O3系焼結体
（TiO230wt％、Al2O370wt％）
を用いて同様の摩耗試験を行なつた。
第１表は各焼結体の熱膨脹係数を示す。
また、試験結果は、第２表と第３表に示す。第
２表は焼結体の硬さと摩耗量を、第３表は相手材
摩耗量を示している。
Field of Application This invention relates to slider materials for magnetic disks and wear-resistant functional material for magnetic tapes, which have excellent compatibility with recording media and lubricity, thermal consistency with metal thin films, and adhesion strength. This invention relates to materials for magnetic heads and sliders. Background technology Up until now, magnetic heads and sliders for recording and reproduction of computers, audio, VTR, etc. have been made using polycrystalline Ni-Zn ferrite, Mn-Zn
Ferrite, single-crystal Mn-Zn ferrite, or high-hardness permalloy were used. Nowadays, there is a strong desire for higher recording density and improved wear resistance, and more and more thin film magnetic heads are being developed. With the trend toward thin-film magnetic heads, optimal materials that satisfy the required characteristics are being selected for each of the magnetic circuit member material for recording and reproduction and the wear-resistant slider material. That is, for magnetic circuits, thin films of permalloy, sendust, or amorphous, which have excellent magnetic properties in the high frequency range, are used, while alumina-based materials are considered desirable for functional parts that require wear resistance. There is. Such materials for wear-resistant sliding members are non-magnetic materials, but have excellent wear resistance, precision machinability, machining efficiency, high strength, dense structure, compatibility with recording media, lubricity, and metallurgy. Various properties such as thermal compatibility with the thin film and adhesion strength are required. Conventionally, as a material for magnetic heads and sliders,
Al 2 O 3 -TiC material (Japanese Unexamined Patent Publication No. 163665/1983) is
Although it has excellent various properties and is one of the most suitable materials for such wear-resistant functional components, it cannot necessarily be said to be a stable material in terms of compatibility with recording media and lubricity . The coefficient of thermal expansion of the material is also 7.5 ~
8.0×10 -6 / ℃, and TiO 2 O 3 -Al 2 O 3 based material ( JP-A No. 57-198578) has been proposed, and has extremely excellent properties in many aspects and is one of the most suitable materials for wear-resistant functional parts.
The thermal expansion coefficient of TiO 2 - Al 2 O 3 material is 7.5 to 8.5×
10 -6 /℃, and when metal thin films, etc. are formed on the surfaces of these materials, there is a large difference in coefficient of thermal expansion between the functional component and the thin film, which poses issues that need improvement in terms of thermal consistency and adhesion strength. I was getting used to it. There is a need for functional members to have properties that enhance thermal compatibility and adhesion strength with various thin films formed on the surfaces of such materials. Purpose of the Invention This invention addresses the requirements for wear-resistant functional members of magnetic heads and sliders, including wear resistance, precision machinability, machining efficiency, high strength, dense structure, compatibility with recording media, and lubrication. Satisfies various characteristics such as gender,
In particular, it is intended to be a material for magnetic head sliders that has excellent thermal compatibility with metal thin films and adhesion strength. Structure and Effects of the Invention In view of the above-mentioned problems, the present invention provides a magnetic head with excellent thermal consistency and adhesion strength with metal thin films.
After examining various materials for the slider, we found that TiO 2 -
By containing a specific amount of ZrO 2 in the Al 2 O 3 -Li 2 O system, it satisfies the various properties required for wear-resistant functional components of magnetic heads and sliders, and improves thermal compatibility with metal thin films and coatings. It was discovered that a material with excellent adhesion strength can be obtained. That is, the present invention is based on TiO 2 20wt%~60wt%
%, Al2O3 5wt %~75wt%, Li2O 5wt%~35wt
This is a material for a magnetic head slider, characterized in that it contains 0.2 to 10 parts by weight of ZrO 2 based on 100 parts by weight of the composition consisting of ZrO 2 . More specifically, for example, the material according to the present invention contains 20wt% to 60wt% of TiO 2 and 5wt% to Al 2 O 3
Composition 100 consisting of 75wt%, Li 2 O 5wt% ~ 35wt%
After crushing and mixing parts by weight of high-purity oxide raw materials, roasting at 800°C to 1000°C, further adding 0.2 parts to 10 parts by weight of high-purity ZrO 2 raw materials and re-pulverizing.
Molded by dry press, wet isostatic press, and various other molding methods, the molded body is heated to 1100℃ in an atmospheric atmosphere.
It can be obtained by sintering at a temperature of 1300°C to 1300°C, or by hot pressing or hot isostatic pressing. The TiO 2 -Al 2 O 3 -LiO-ZrO 2 based magnetic head/slider material according to the present invention can be used as an intermediate material between conventional ferrite based materials and Al 2 O 3 -TiC based materials to meet the requirements for materials for such applications. It satisfies various characteristics such as wear resistance, precision machinability, machining efficiency, high strength, and dense structure, and is compatible with recording media.
Not only does it have excellent lubricity, but it also has a coefficient of thermal expansion close to that of the metal thin film it adheres to, and has excellent thermal compatibility with the metal thin film and adhesion strength that conventional materials do not have. Reason for component limitation In this invention, TiO 2 is the main component of the present material together with Al 2 O 3 , and if less than 20 wt %, TiO 2 is the main component of this material.
-The hardness of TiO2 -based sintered bodies has increased, and the difference in hardness from soft ferrite, which has been widely used as a material for magnetic circuits in magnetic heads, has become large, making it difficult to apply soft ferrite to some recording media. Moreover, if it exceeds 60 wt%, pores are generated and it is not suitable as a material for a magnetic head, so it is set at 20 wt% to 60 wt%. Li 2 O is contained to increase the thermal expansion coefficient of TiO 2 -Al 2 O 3 based materials, but if Li 2 O is less than 5 wt%, the thermal expansion coefficient will be less than 9 × 10 -6 /deg,
The difference in coefficient of thermal expansion between the magnetic thin film Permalloy and Sendust becomes too large, which is undesirable.
When it exceeds 35wt%, the coefficient of thermal expansion is 17×10 -6 /deg
If the amount exceeds the above, the difference in coefficient of thermal expansion with the thin film becomes large, which is undesirable. Al 2 O 3 is a main component of the present material along with TiO 2 , and as mentioned above, the content range of TiO 2 and Li 2 O is limited to a range of 5wt% to 75wt%. ZrO 2 is added to improve the lubricity of the material with the recording medium and the strength of the compact, but TiO 2
If the amount is less than 0.2 parts by weight for a total of 100 parts by weight of Al 2 O 3 and Li 2 O, the above effects will be small, and the system structure and strength will not be improved, making precision processing difficult when processing molded products. Moreover, addition of more than 10 parts by weight significantly lowers the hardness and adhesion strength to the metal thin film, making it unsuitable as a thin film magnetic head material.
Although it has the effect of suppressing the growth of TiO 2 -Li 2 O crystal particles,
If it exceeds 10 parts by weight, the material will crack.
The amount to be added is 0.2 parts by weight to 10 parts by weight. In addition, in this invention, the initial purpose can be achieved even if ZrO 2 is used as a raw material having the following characteristics. The ZrO 2 powder raw materials include stabilized powder containing no stabilizer and Y 2 O 3 , MgO, Ce 2 O 3 and CaO.
There are powders that have been partially stabilized or stabilized with, etc., and any of these powders can be used. However, in order to obtain a better material, if unstabilized ZrO 2 powder is used, the purity should be 99.9% or more and the average particle size should be 0.1 μm or less, and the final state should be in the form of tetragonal or cubic crystals. As a result, a structure-improving effect and a strength-improving effect can be obtained. When using partially stabilized or stabilized ZrO 2 powder, 1.5 to 7 mol% Y 2 O 3 - ZrO 2 system,
The use of powder with impurities of 0.1% or less and average particle size of 0.3 μm or less provides the best results in terms of structure improvement effect and strength improvement effect. Furthermore, by using a raw material in which a part of Al 2 O 3 is replaced with ZrO 2 (unstabilized, partially stabilized, stabilized) instead of Al 2 O 3 in the basic structure, the
The addition of ZrO 2 can be omitted. Example Using powders of Al 2 O 3 with a purity of 99.9% and an average particle size of 0.6 μm, TiO 2 with a purity of 99.9% and an average particle size of 0.3 μm, and Li 2 O with a purity of 99% and an average particle size of 1 μm, TiO 2 55wt% - Al 2 O 3 30wt% - Li 2 O 15wt%
The mixture was mixed and wet-mixed in a ball mill for 20 hours. Next, after drying this mixed powder, 900℃
For 100 parts by weight of this mixed powder,
5 parts by weight of ZrO 2 with an average particle size of 0.2 μm [ZrO 2 -2.5 mol
%Y 2 O 3 ] powder was subjected to wet mixing and pulverization in a ball mill for 20 hours to obtain a powder for sintering. Next, fill the mold with the above sintering powder and
℃, apply a pressure of 200 kg/cm 2 and hold it for 1 hour, then reduce the pressure and let it cool. Dimensions: 50 mm x 50 mm x 5.5
A sintered body of mm was obtained. The physical properties of the sintered body according to this example are as follows. a Specific gravity: 3.55 b Hardness: H R A88.3 H V 1290 c Transverse rupture strength: 30Kg/mm 2 d Thermal conductivity: 0.025Cal/cmsec℃ e Electrical resistance: <0.01Ω - cm or moref Coefficient of thermal expansion: 14× 10 -6 /℃ In addition, when materials with the above composition were obtained by sintering methods such as atmospheric furnace sintering, hot pressing, and hot isostatic pressing, there were slight differences in the strength of the materials depending on the sintering method. A high-strength material was obtained as a pressure sintered product, but the coefficient of thermal expansion is not affected much by the sintering method, and its value is determined by the composition of the material, and this material with the composition of the invention is the first As shown in the table, the characteristics were 9 to 17×10 −6 /°C. In addition, as a result of depositing various thin films on the various materials shown in Examples and Table 1, it was found that the thermal compatibility and adhesion strength were the best with materials whose coefficient of thermal expansion was close to that of the thin film, and It was found that the sintered material (pressure sintered product) in which a very small amount of lower oxides are produced has superior adhesion strength to the thin film. Next, the above sintered body was made into a rectangular parallelepiped with a cross section of 2 mm x 4 mm and a length of 20 mm using a diamond grindstone,
One end was shaped into a sharp blade shape. Furthermore, using a donut-shaped disc of ferrite with an outer diameter of 45 mm x inner diameter of 10 mm x thickness of 10 mm, combining it with the sintered body of the present invention, and bringing the sharp cutting edge of the sintered body into contact with the rotating ferrite, A so-called pin-disk type wear test was conducted. In addition, during the above test, conventional ferrite-based materials (Mn-Zn polycrystalline ferrite, MnO 32wt%, ZnO 2 15wt%, Fe 2 O 3
53wt%), Al 2 O 3 -TiC sintered body (Al 2 O 3 70wt%, TiC 30wt%), TiO 2 -Al 2 O 3 based sintered body (TiO 2 30wt%, Al 2 O 3 70wt%) ) was used to conduct a similar wear test. Table 1 shows the coefficient of thermal expansion of each sintered body. The test results are shown in Tables 2 and 3. Table 2 shows the hardness and wear amount of the sintered body, and Table 3 shows the wear amount of the mating material.
【表】【table】
【表】【table】
【表】
第１表から第３表の結果より明らかなように、
この発明によるTiO2―Al2O3―Li2O―ZrO2系の
磁気ヘツド・スライダー用材料は、従来のフエラ
イト系材料と、Al2O3―TiC系材料との中間程度
の硬度を有する材料として、かかる用途材料に要
求される耐摩耗性などの諸特性を満足し、記録媒
体とのなじみ、潤滑性にすぐれるだけでなく、特
に、金属薄膜との熱的整合性や被着強度に、従来
材料にないすぐれた性能を有する。[Table] As is clear from the results in Tables 1 to 3,
The TiO 2 -Al 2 O 3 -Li 2 O -ZrO 2 -based magnetic head/slider material according to the present invention has a hardness that is intermediate between conventional ferrite-based materials and Al 2 O 3 -TiC-based materials. As a material, it satisfies various properties such as wear resistance required for materials for such applications, and not only has excellent compatibility with recording media and lubricity, but also has particularly good thermal compatibility with metal thin films and adhesion strength. In addition, it has superior performance not found in conventional materials.
Claims (1)
75wt％、Li2O 5wt％〜35wt％ からなる組成100重量部に対し、 ZrO2 0.2重量部〜10重量部を含有したことを特
徴とする磁気ヘツド・スライダー用材料。[Claims] 1 TiO 2 20wt% to 60wt%, Al 2 O 3 5wt% to
A material for a magnetic head/slider, characterized in that it contains 0.2 to 10 parts by weight of ZrO 2 to 100 parts by weight of a composition consisting of 75 wt% and 5 to 35 wt% of Li 2 O.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60043537A JPS61201660A (en) | 1985-03-05 | 1985-03-05 | Material for magnetic head slider |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60043537A JPS61201660A (en) | 1985-03-05 | 1985-03-05 | Material for magnetic head slider |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61201660A JPS61201660A (en) | 1986-09-06 |
| JPH022820B2 true JPH022820B2 (en) | 1990-01-19 |
Family
ID=12666487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60043537A Granted JPS61201660A (en) | 1985-03-05 | 1985-03-05 | Material for magnetic head slider |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61201660A (en) |
-
1985
- 1985-03-05 JP JP60043537A patent/JPS61201660A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61201660A (en) | 1986-09-06 |
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