JP3460091B2 - Non-magnetic ceramics for magnetic heads - Google Patents
Non-magnetic ceramics for magnetic headsInfo
- Publication number
- JP3460091B2 JP3460091B2 JP14322693A JP14322693A JP3460091B2 JP 3460091 B2 JP3460091 B2 JP 3460091B2 JP 14322693 A JP14322693 A JP 14322693A JP 14322693 A JP14322693 A JP 14322693A JP 3460091 B2 JP3460091 B2 JP 3460091B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- ceramics
- znfe
- present
- heads
- 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 - Fee Related
Links
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- Hard Magnetic Materials (AREA)
- Magnetic Ceramics (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Magnetic Heads (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は，磁気ヘッドの一部に構
成されるスライダー等に使用される非磁性セラミックス
に関するものである。
【０００２】
【従来の技術】一般に，コンピュータ，ＶＴＲ，オーデ
ィオ関係の磁気ヘッドは，磁性材料であるフェライトと
非磁性セラミックスをガラス又は樹脂でボンディングし
て製造されている。
【０００３】従来，この様な磁性材料と非磁性材料によ
り磁気ヘッドを構成する場合には，磁性材料にＭｎ−Ｚ
ｎフェライト又はＮｉ−Ｚｎフェライトを使用し，非磁
性材料にＢａＴｉＯ3 ，ＣａＴｉＯ3 ，ＺｎＦｅ
2 Ｏ4 ，Ｆｅ2 Ｏ3 等のセラミックスやＦｅ2 Ｏ3 ＋Ｚ
ｎＦｅ2 Ｏ4 複合セラミックスを使用するのが一般的で
あった。
【０００４】
【発明が解決しようとする課題】しかしながら，ＢａＴ
ｉＯ3 ，ＣａＴｉＯ3 等のセラミックスを使用する磁気
ヘッドは，磁気テープやディスクとの長時間摺動時に摩
擦係数が増大し，摺動特性が悪化するという問題を有し
ていた。
【０００５】一方，ＺｎＦｅ2 Ｏ4 は，摺動特性は良い
が，熱膨張係数が小さいという欠点を有していた。
【０００６】また，ＺｎＦｅ2 Ｏ4 材の摺動特性を生か
し，熱膨張係数を改善したＦｅ2 Ｏ3 ＋ＺｎＦｅ2 Ｏ4
複合セラミックスからなる材料は，加工時にチッピング
が発生しやすいという欠点を有していた。
【０００７】そこで，本発明の技術的課題は，加工時の
チッピングが発生しにくい（加工性の良い）磁気ヘッド
に用いられる非磁性のＦｅ2 Ｏ3 ＋ＺｎＦｅ2 Ｏ4 複合
セラミックスを提供することにある。
【０００８】
【課題を解決するための手段】本発明では，上記課題を
解決するために，フェライトの一成分であり，熱膨張係
数の大きなＦｅ2 Ｏ3 と，摺動特性の良好なＺｎＦｅ2
Ｏ4 との複合構造を有する非磁性セラミックスの結晶粒
径を，添加物を適切に選択することにより，微細に制御
し，加工性を改善したものである。
【０００９】本発明によれば，Ｆｅ2 Ｏ3 相とＺｎＦｅ
2 Ｏ4 相との複合構造から成るセラミックス１００重量
部に対し，副成分としてＹ2 Ｏ3 ，Ｌａ2 Ｏ3 ，ＣｅＯ
2 ，Ａｌ2 Ｏ3 ，ＺｒＯ2 ，ＴｉＯ2 の１種又は２種以
上を０．０１〜５ｗｔ％添加して成ることを特徴とする
磁気ヘッド用非磁性セラミックスが得られる。
【００１０】即ち，本発明においては，Ｆｅ2 Ｏ3 ＋Ｚ
ｎＦｅ2 Ｏ4 材に，Ｙ2 Ｏ3 ，Ｌａ2 Ｏ3 ，ＣｅＯ2 ，
Ａｌ2 Ｏ3 ，ＺｒＯ2 ，ＴｉＯ2 の一種又は二種以上を
０．０１〜５ｗｔ％添加することにより結晶粒径を微細
に制御することが可能となり，加工時チッピング抑制に
効果を持たせたものである。ここで，本発明において，
添加物の量を０．０１〜５ｗｔ％と限定したのは，０．
０１ｗｔ％以下では，結晶制御に効果はなく，５ｗｔ％
を越えると，結晶粒界に添加物成分が析出し，強度，硬
度の低下をもたらすからである。
【００１１】
【実施例】以下，本発明の実施例について説明する。
【００１２】市販の原料であるＦｅ2 Ｏ3 ，ＺｎＯをそ
れぞれ８０モル％，２０モル％とし，Ｆｅ2 Ｏ3 ＋Ｚｎ
Ｏ １００重量部に対し，Ｙ2 Ｏ3 ，Ｌａ2 Ｏ3 ，Ｃｅ
Ｏ2，Ａｌ2 Ｏ3 ，ＺｒＯ2 ，ＴｉＯ2 を下表１となる
様に秤量した。ボールミルにて湿式混合（２４時間）し
た後乾燥し，１０００℃の温度で仮焼を行った。さらに
ボールミルにて湿式粉砕，乾燥後ＰＶＡ系バインダーを
１％添加し，スプレードライヤーにて造粒を行った。造
粒粉を１〜２ｔｏｎ／ｃｍ2 の圧力で金型成形し，大気
中にて１０００〜１２００℃，３時間焼結を行った。焼
結後９００℃〜１１００℃ １０００ｋｇｆ／ｃｍ2 の
圧力にて２時間Ａｒガス雰囲気中にて熱間静水圧プレス
処理を行った。
【００１３】以上の工程より得られた試料全てにおいて
Ｆｅ2 Ｏ3 相及びＺｎＦｅ2 Ｏ4 相が確認された。全試
料について熱膨張係数ビッカース硬度，抗析強度，結晶
粒径，気孔率，チッピング発生数を測定した。その結果
を下表１に示す。チッピング発生数は，試料を鏡面加工
し， #８００砥石にて溝加工した時に稜部に発生した２
μｍ以上のチッピングを光学顕微鏡にて観察し，単位長
さ当りのチッピング発生数に換算したものである。
【００１４】
【表１】【００１５】表１から無添加のＮｏ．１と本発明例のＮ
ｏ．２，３，４，５，６，７，８，９，１０を比較する
と，本発明例は，結晶粒径が微細化し，加工時に発生す
るチッピングが少ないことがわかる。
【００１６】即ち，Ｙ2 Ｏ3 ，Ｌａ2 Ｏ3 ，ＣｅＯ2 ，
Ａｌ2 Ｏ3 ，ＺｒＯ2 ，ＴｉＯ2 の１種又は２種以上
が，０．０１〜５ｗｔ％以内の添加量の時，効果がある
ことがわかる。しかし，前記添加物が，０．０１ｗｔ％
より少ない場合（比較例Ｎｏ．１１，１２）には，結晶
粒径の微細化が起こらず，加工時のチッピング発生も多
い。また，５．０ｗｔ％を越えると，気孔率が大きくな
り，ビッカース硬度，抗析強度の低下が認められる。
【００１７】以上，本発明の実施例において，Ｆｅ2 Ｏ
3 相及びＺｎＦｅ2 Ｏ4 相から成るセラミックスに，Ｙ
2 Ｏ3 ，Ｌａ2 Ｏ3 ，ＣｅＯ2 ，Ａｌ2 Ｏ3 ，Ｚｒ
Ｏ2 ，ＴｉＯ2 の１種又は２種以上を０．０１〜５ｗｔ
％添加することにより，加工時のチッピングが発生しに
くく，加工性に優れた磁気ヘッド用非磁性セラミックス
が得られた。
【００１８】
【発明の効果】以上の説明から明らかな様に，本発明に
よれば，摺動特性が良好で，加工性に優れた，高密度非
磁性セラミックスを容易に製造可能である。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-magnetic ceramic used for a slider or the like formed as a part of a magnetic head. 2. Description of the Related Art Generally, magnetic heads for computers, VTRs, and audio are manufactured by bonding ferrite, which is a magnetic material, and nonmagnetic ceramics with glass or resin. Conventionally, when a magnetic head is made of such a magnetic material and a non-magnetic material, Mn-Z
n ferrite or Ni-Zn ferrite, and BaTiO 3 , CaTiO 3 , ZnFe
Ceramics such as 2 O 4 and Fe 2 O 3 and Fe 2 O 3 + Z
It was common to use nFe 2 O 4 composite ceramics. [0004] However, BaT
Magnetic heads using ceramics such as iO 3 and CaTiO 3 have the problem that the friction coefficient increases during long-time sliding with a magnetic tape or disk, and the sliding characteristics deteriorate. [0005] On the other hand, ZnFe 2 O 4 has good sliding properties, but has a drawback that its thermal expansion coefficient is small. Further, Fe 2 O 3 + ZnFe 2 O 4 having improved thermal expansion coefficient utilizing the sliding characteristics of ZnFe 2 O 4 material.
The composite ceramic material has a disadvantage that chipping is apt to occur during processing. Therefore, a technical object of the present invention is to provide a nonmagnetic Fe 2 O 3 + ZnFe 2 O 4 composite ceramic used for a magnetic head in which chipping does not easily occur during processing (has good workability). is there. In the present invention, in order to solve the above problems, Fe 2 O 3 which is a component of ferrite and has a large coefficient of thermal expansion, and ZnFe 2 which has a good sliding property are used.
By appropriately selecting the additive, the crystal grain size of the nonmagnetic ceramic having a composite structure with O 4 is finely controlled to improve workability. According to the present invention, the Fe 2 O 3 phase and the ZnFe
Y 2 O 3 , La 2 O 3 , and CeO are used as auxiliary components with respect to 100 parts by weight of a ceramic having a composite structure with a 2 O 4 phase.
2, Al 2 O 3, non-magnetic ceramic for a magnetic head ZrO 2, TiO 2 of one or more characterized by comprising the addition 0.01-5% is obtained. That is, in the present invention, Fe 2 O 3 + Z
nFe 2 O 4 materials include Y 2 O 3 , La 2 O 3 , CeO 2 ,
By adding one or more of Al 2 O 3 , ZrO 2 , and TiO 2 in an amount of 0.01 to 5 wt%, it is possible to finely control the crystal grain size, and to suppress chipping during processing. Things. Here, in the present invention,
The reason why the amount of the additive is limited to 0.01 to 5% by weight is as follows.
At less than 01 wt%, there is no effect on crystal control, and 5 wt%
If the ratio exceeds the above range, the additive component precipitates at the crystal grain boundaries, resulting in a decrease in strength and hardness. An embodiment of the present invention will be described below. Fe 2 O 3 and ZnO, which are commercially available raw materials, are respectively 80 mol% and 20 mol%, and Fe 2 O 3 + ZnO
Y 2 O 3 , La 2 O 3 , Ce
O 2 , Al 2 O 3 , ZrO 2 , and TiO 2 were weighed as shown in Table 1 below. After wet mixing (24 hours) in a ball mill, it was dried and calcined at a temperature of 1000 ° C. Further, after wet pulverization and drying with a ball mill, 1% of a PVA-based binder was added, and granulation was performed with a spray drier. The granulated powder was molded in a mold at a pressure of 1 to 2 ton / cm 2 and sintered in the atmosphere at 1000 to 1200 ° C. for 3 hours. After sintering, hot isostatic pressing was performed at 900 ° C. to 1100 ° C. at a pressure of 1000 kgf / cm 2 for 2 hours in an Ar gas atmosphere. The Fe 2 O 3 phase and the ZnFe 2 O 4 phase were confirmed in all the samples obtained from the above steps. The coefficient of thermal expansion, Vickers hardness, precipitation resistance, crystal grain size, porosity, and number of chippings of all samples were measured. The results are shown in Table 1 below. The number of chippings generated was 2 at the ridge when the sample was mirror-finished and grooved with a # 800 grindstone.
This is a value obtained by observing chippings of μm or more with an optical microscope and converting the number of chippings occurring per unit length. [Table 1] [0015] From Table 1, No. 1 and N of the present invention
o. Comparing 2,3,4,5,6,7,8,9,10, it can be seen that in the present invention example, the crystal grain size is fine and chipping generated during processing is small. That is, Y 2 O 3 , La 2 O 3 , CeO 2 ,
Al 2 O 3, ZrO 2, 1 kind of TiO 2 or two or more kinds, when the addition amount within 0.01-5%, it is found to be effective. However, if the additive is 0.01 wt%
When the number is smaller (Comparative Examples Nos. 11 and 12), the crystal grain size is not reduced, and chipping often occurs during processing. On the other hand, when the content exceeds 5.0 wt%, the porosity increases, and the Vickers hardness and the precipitation strength are reduced. As described above, in the embodiment of the present invention, Fe 2 O
Ceramics consisting of three phases and ZnFe 2 O 4
2 O 3 , La 2 O 3 , CeO 2 , Al 2 O 3 , Zr
One or two or more of O 2 and TiO 2 are used in an amount of 0.01 to 5 wt.
By adding%, chipping during processing hardly occurs, and a nonmagnetic ceramic for a magnetic head having excellent workability was obtained. As is clear from the above description, according to the present invention, high-density non-magnetic ceramics having good sliding characteristics and excellent workability can be easily manufactured.
Claims (1)
合構造から成るセラミックス１００重量部に対し，副成
分としてＹ2 Ｏ3 ，Ｌａ2 Ｏ3 ，ＣｅＯ2 ，Ａｌ
2 Ｏ3 ，ＺｒＯ2 ，ＴｉＯ2 の１種又は２種以上を０．
０１〜５ｗｔ％添加して成ることを特徴とする磁気ヘッ
ド用非磁性セラミックス。(57) Patent Claims 1. A Fe to 2 O 3 phase and ZnFe 2 ceramic 100 parts by weight of composite structure with O 4 phase, Y 2 O 3 as an auxiliary component, La 2 O 3 , CeO 2 , Al
One or two or more of 2 O 3 , ZrO 2 , and TiO 2 may be added in an amount of 0.
Non-magnetic ceramics for magnetic heads, characterized by being added in an amount of from 0.01 to 5 wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14322693A JP3460091B2 (en) | 1993-06-15 | 1993-06-15 | Non-magnetic ceramics for magnetic heads |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14322693A JP3460091B2 (en) | 1993-06-15 | 1993-06-15 | Non-magnetic ceramics for magnetic heads |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0717762A JPH0717762A (en) | 1995-01-20 |
| JP3460091B2 true JP3460091B2 (en) | 2003-10-27 |
Family
ID=15333836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14322693A Expired - Fee Related JP3460091B2 (en) | 1993-06-15 | 1993-06-15 | Non-magnetic ceramics for magnetic heads |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3460091B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI361814B (en) | 2003-03-07 | 2012-04-11 | Kuraray Co | Plastic bonding method |
| CN103094558B (en) * | 2012-12-18 | 2016-03-02 | 深圳市贝特瑞新能源材料股份有限公司 | A kind of zinc ferrite based nano composite material, preparation method and its usage |
| CN103413921B (en) * | 2013-08-26 | 2015-07-08 | 中国科学技术大学 | Spinel magnetic ferrite/molybdenum disulfide nanometer composite material as well as preparation method and application thereof |
-
1993
- 1993-06-15 JP JP14322693A patent/JP3460091B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0717762A (en) | 1995-01-20 |
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