JPH11106236A - Low melting point glass for magnetic head - Google Patents
Low melting point glass for magnetic headInfo
- Publication number
- JPH11106236A JPH11106236A JP28794097A JP28794097A JPH11106236A JP H11106236 A JPH11106236 A JP H11106236A JP 28794097 A JP28794097 A JP 28794097A JP 28794097 A JP28794097 A JP 28794097A JP H11106236 A JPH11106236 A JP H11106236A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- melting point
- low melting
- magnetic head
- point glass
- 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.)
- Pending
Links
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- Glass Compositions (AREA)
- Magnetic Heads (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、磁気ヘッドの接着や固
定に用いられる低融点ガラスに関し、より詳しくはフェ
ライトコアのギャップ部分にセンダスト膜が形成され
た、いわゆるメタル・イン・ギャップ（以下ＭＩＧと称
す）タイプの磁気ヘッドの接着や固定に用いられる低融
点ガラスに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-melting glass used for bonding and fixing a magnetic head, and more particularly, to a so-called metal-in-gap (hereinafter referred to as MIG) in which a sendust film is formed in a gap portion of a ferrite core. The present invention relates to a low-melting glass used for bonding and fixing a magnetic head of the type.
【０００２】[0002]
【従来の技術】磁気記録に用いられる磁気ヘッドには種
々のタイプが存在しているが、なかでもフェライトコア
のギャップ部分にセンダスト膜を施した、いわゆるＭＩ
Ｇタイプのモノシリックヘッドや、このタイプのヘッド
チップをセラミックスの切り込み部分に固定してなるコ
ンポジットヘッドが高密度記録用として広く使用されて
いる。2. Description of the Related Art There are various types of magnetic heads used for magnetic recording. Among them, a so-called MI type in which a sendust film is applied to a gap portion of a ferrite core.
G-type monolithic heads and composite heads in which this type of head chip is fixed to cut portions of ceramics are widely used for high-density recording.
【０００３】一般に磁気ヘッドを作製する場合、フェラ
イトコア同士の接着やセラミックスの切り込み部分への
固定には低融点ガラスが用いられるが、特にＭＩＧタイ
プの磁気ヘッドの接着や固定に用いられる低融点ガラス
には、下記の特性が要求される。In general, when a magnetic head is manufactured, a low-melting glass is used for bonding ferrite cores and fixing the ceramic to a cut portion. Particularly, a low-melting glass used for bonding and fixing a MIG type magnetic head is used. Requires the following characteristics.
【０００４】フェライトにあった熱膨張係数を有する
こと。（センダストの熱膨張係数はフェライトのそれに
比べてかなり高いが、膜厚が１μ前後と極めて薄いため
に、ガラスとセンダストの熱膨張係数に差があっても残
留応力がほとんど生じない。）[0004] To have a coefficient of thermal expansion suitable for ferrite. (The thermal expansion coefficient of Sendust is considerably higher than that of ferrite, but since the film thickness is extremely thin, around 1 μ, little residual stress occurs even if there is a difference in the thermal expansion coefficient between glass and Sendust.)
【０００５】センダストの磁気特性が劣化しないよう
に６００℃以下で熱処理できること。[0005] The heat treatment can be performed at a temperature of 600 ° C. or less so that the magnetic properties of Sendust do not deteriorate.
【０００６】磁気ヘッドの加工時に冷却水と接するた
め、耐水性に優れていること。The magnetic head is excellent in water resistance because it comes into contact with cooling water during processing.
【０００７】ディスクやテープに接触するギャップ部
分においてガラスの摩耗を極力防ぐために、実用上十分
な硬度を有すること。[0007] In order to minimize the abrasion of the glass in the gap portion in contact with the disk or tape, it must have practically sufficient hardness.
【０００８】このような要求特性を満足するために、従
来より鉛硼酸系ガラスや鉛硼珪酸系ガラス等種々の磁気
ヘッド用低融点ガラスが開発されている。In order to satisfy such required characteristics, various low melting point glasses for magnetic heads, such as lead borate glass and lead borosilicate glass, have been developed.
【０００９】[0009]
【発明が解決しようとする課題】しかしながら従来の低
融点ガラスは、いずれも先記した要求特性の全てを満た
すものではなく、特にの耐水性及びの硬度の点にお
いて未だ不十分であり、上記した要求特性を十分に満足
させるものが存在しないのが現状である。However, the conventional low melting point glass does not satisfy all of the above-mentioned required properties, and is still insufficient in water resistance and hardness. At present, there is no one that sufficiently satisfies the required characteristics.
【００１０】本発明の目的は、先記要求特性の全てを満
足させる磁気ヘッド用低融点ガラス、特に耐水性に優
れ、また実用上十分な硬度を有する磁気ヘッド用低融点
ガラスを提供することである。An object of the present invention is to provide a low-melting glass for a magnetic head which satisfies all of the above-mentioned required characteristics, in particular, a low-melting glass for a magnetic head which has excellent water resistance and sufficient hardness for practical use. is there.
【００１１】[0011]
【課題を解決するための手段】本発明者は種々の研究を
行った結果、鉛硼珪酸系のガラスにＭｏＯ3 を必須成分
として含有させることにより、ガラスの耐水性が改善さ
れ、また実用的な硬度が得られることを見いだし、本発
明として提案するものである。As a result of various studies, the present inventor has found that by adding MoO 3 to lead borosilicate glass as an essential component, the water resistance of the glass is improved and the glass is practically usable. It has been found that a high hardness can be obtained, and is proposed as the present invention.
【００１２】即ち、本発明の磁気ヘッド用低融点ガラス
は、ＭｏＯ3 を０．３〜５重量％含有する鉛硼珪酸系ガ
ラスからなることを特徴とする。That is, the low melting point glass for a magnetic head of the present invention is characterized by being made of a lead borosilicate glass containing 0.3 to 5% by weight of MoO 3 .
【００１３】[0013]
【作用】本発明においてＭｏＯ3 は、鉛硼珪酸系ガラス
の耐水性を改善するとともに、硬度を高める効果があ
り、その含有量は０．３〜５％、好ましくは０．５〜３
％である。ＭｏＯ3 が０．３％より少ないとその効果が
なく、５％より多いとガラスが失透し易くなる。In the present invention, MoO 3 has the effect of improving the water resistance of lead borosilicate glass and increasing the hardness, and its content is 0.3 to 5%, preferably 0.5 to 3%.
%. If the content of MoO 3 is less than 0.3%, the effect is not obtained.
【００１４】また本発明において、鉛硼珪酸系ガラスと
しては、ＭｏＯ3 を０．３〜５．０重量％含有し、Ｐｂ
Ｏ、Ｂ2 Ｏ3 、及びＳｉＯ2 を主成分とするものであれ
ば、種々の組成を有する低融点ガラスが使用できる。特
に重量百分率でＰｂＯ ４０〜８５％、Ｂ2 Ｏ3 ２〜
１０％、ＳｉＯ2 ４〜２０％、ＴｅＯ2 ０〜５％、
Ａｌ2 Ｏ3 ０〜５％、ＺｎＯ ０〜５％、Ｎａ2 Ｏ
０〜３％、Ｋ2 Ｏ ０〜５％、Ｂｉ2 Ｏ3 ０〜３５
％、Ｆｅ2 Ｏ3 ０〜８％、ＭｎＯ2 ０〜２％、Ｍｏ
Ｏ3 ０．３〜５％の組成を有する低融点ガラスは、３
０〜３００℃における熱膨張係数がフェライトのそれ
（１００〜１２０×１０-7／℃）にあう９５〜１１５×
１０-7／℃であり、また軟化点が５００℃以下であるた
めに６００℃以下の温度で熱処理が可能であり、磁気ヘ
ッド用として好ましいものである。以下に組成範囲をこ
のように限定した理由を述べる。In the present invention, the lead borosilicate glass contains 0.3 to 5.0% by weight of MoO 3 and contains Pb
As long as O, B 2 O 3 , and SiO 2 are the main components, low melting point glasses having various compositions can be used. In particular PbO 40 to 85% in weight percent, B 2 O 3 2~
10%, SiO 2 4~20%, TeO 2 0~5%,
Al 2 O 3 0-5%, ZnO 0-5%, Na 2 O
0~3%, K 2 O 0~5% , Bi 2 O 3 0~35
%, Fe 2 O 3 0~8% , MnO 2 0~2%, Mo
Low-melting glass having a composition of O 3 0.3 to 5%
95-115 × whose coefficient of thermal expansion at 0-300 ° C. matches that of ferrite (100-120 × 10 −7 / ° C.)
Since the softening point is 10 -7 / ° C. and the softening point is 500 ° C. or less, heat treatment can be performed at a temperature of 600 ° C. or less, which is preferable for a magnetic head. The reason for limiting the composition range in this manner will be described below.
【００１５】ＰｂＯはガラスを低融点化する作用があ
り、その含有量は４０〜８５％、好ましくは４５〜８２
％である。ＰｂＯが６５％より少ないと軟化点が高くな
って６００℃以下の温度で熱処理することができなくな
り、８５％より多いとガラス化が困難になる。PbO has the effect of lowering the melting point of glass, and its content is 40 to 85%, preferably 45 to 82%.
%. If the content of PbO is less than 65%, the softening point becomes high, so that heat treatment cannot be performed at a temperature of 600 ° C. or less, and if it is more than 85%, vitrification becomes difficult.
【００１６】Ｂ2 Ｏ3 はガラスを安定化させる成分であ
り、その含有量は２〜１０％、好ましくは２〜８％であ
る。Ｂ2 Ｏ3 が２％より少ないとガラスが不安定とな
り、１０％より多いと耐水性が悪くなる。B 2 O 3 is a component for stabilizing glass, and its content is 2 to 10%, preferably 2 to 8%. If B 2 O 3 is less than 2%, the glass becomes unstable, and if it is more than 10%, the water resistance deteriorates.
【００１７】ＳｉＯ2 はガラス化範囲を広げる成分であ
り、その含有量は４〜２０％、好ましくは５〜２０％で
ある。ＳｉＯ2 が４％より少ないと耐水性が悪くなり、
２０％より多いと軟化点が高くなって６００℃以下の温
度で熱処理できなくなる。SiO 2 is a component that widens the vitrification range, and its content is 4 to 20%, preferably 5 to 20%. If the content of SiO 2 is less than 4%, the water resistance becomes poor,
If it is more than 20%, the softening point becomes high, and it becomes impossible to perform heat treatment at a temperature of 600 ° C or less.
【００１８】ＴｅＯ2 はガラスを低融点化させるととも
に、耐水性を向上させる成分であり、その含有量は０〜
５％である。ＴｅＯ2 が５％より多いと軟化点が高くな
る。TeO 2 is a component that lowers the melting point of glass and improves water resistance.
5%. If the content of TeO 2 is more than 5%, the softening point becomes high.
【００１９】Ａｌ2 Ｏ3 はガラス化を助ける成分であ
り、その含有量は０〜５％である。Ａｌ2 Ｏ3 が５％よ
り多いと軟化点が高くなる。Al 2 O 3 is a component that promotes vitrification, and its content is 0 to 5%. If Al 2 O 3 is more than 5%, the softening point will be high.
【００２０】ＺｎＯはガラスの熱膨張係数を上げずに低
融点化させる成分であり、その含有量は０〜５％であ
る。ＺｎＯが５％より多いと熱処理時に失透し易くな
る。ZnO is a component that lowers the melting point of the glass without increasing the thermal expansion coefficient, and its content is 0 to 5%. If ZnO is more than 5%, devitrification tends to occur during heat treatment.
【００２１】Ｎａ2 ＯとＫ2 Ｏはガラスの熱膨張係数を
調整するためにそれぞれ０〜３％、０〜５％含有する。
Ｎａ2 Ｏが３％より多い場合、またはＫ2 Ｏが５％より
多い場合は耐水性が悪くなる。Na 2 O and K 2 O are respectively contained in an amount of 0 to 3% and 0 to 5% in order to adjust the thermal expansion coefficient of the glass.
When Na 2 O is more than 3% or when K 2 O is more than 5%, water resistance is deteriorated.
【００２２】Ｂｉ2 Ｏ3 はガラスを低融点化させる成分
であり、その含有量は０〜３５％である。Ｂｉ2 Ｏ3 が
３５％より多いとガラスが失透し易くなる。Bi 2 O 3 is a component for lowering the melting point of glass, and its content is 0 to 35%. If the content of Bi 2 O 3 is more than 35%, the glass tends to be devitrified.
【００２３】Ｆｅ2 Ｏ3 とＭｎＯ2 はフェライトやセン
ダストとのなじみを良くする成分であり、それぞれ０〜
８％、０〜２％含有する。Ｆｅ2 Ｏ3 が８％より多いと
き、またはＭｎＯ2 が２％より多いとガラスが着色して
不透明になるとともにガラスが高融点化し、６００℃以
下で封着できなくなる。[0023] Fe 2 O 3 and MnO 2 is a component to improve the conformability between ferrite and Sendust, respectively 0
8%, 0-2%. When the content of Fe 2 O 3 is more than 8% or the content of MnO 2 is more than 2%, the glass is colored and becomes opaque, and the glass has a high melting point.
【００２４】[0024]
【実施例】以下、実施例に基づいて本発明の磁気ヘッド
用低融点ガラスを説明する。The low melting point glass for a magnetic head according to the present invention will be described below based on examples.
【００２５】表１は本発明の実施例（試料Ｎｏ．１〜
５）及び比較例（試料Ｎｏ．６）を示すものである。Table 1 shows examples of the present invention (samples No. 1 to No. 1).
5) and Comparative Example (Sample No. 6).
【００２６】[0026]
【表１】 [Table 1]
【００２７】試料Ｎｏ．１〜６は次のようにして調製し
た。重量百分率で表の組成となるように調合した原料バ
ッチを白金ルツボに入れ、１２００℃で１時間溶融した
後、所定の形状に成形して試料を得た。Sample No. 1 to 6 were prepared as follows. A raw material batch prepared so as to have the composition shown in the table in terms of weight percentage was put in a platinum crucible, melted at 1200 ° C. for 1 hour, and then formed into a predetermined shape to obtain a sample.
【００２８】次に得られた試料について、熱膨張係数、
軟化点、耐水性及び硬度を評価した。結果を表に示す。Next, the thermal expansion coefficient,
The softening point, water resistance and hardness were evaluated. The results are shown in the table.
【００２９】表から明らかなように実施例である試料N
o. １〜５は、３０〜３００℃における熱膨張係数が１
０２〜１０９×１０-7／℃、軟化点が４２５〜４７５
℃、耐水性試験による段差が０．０９〜０．２０μｍ、
硬度が３３０〜４１０ｋｇ／ｍｍ2 であった。As is clear from the table, the sample N of the embodiment
o. 1 to 5 have a coefficient of thermal expansion of 1 at 30 to 300 ° C.
02-109 × 10 -7 / ° C, softening point 425-475
° C, the step by the water resistance test is 0.09 to 0.20 µm,
The hardness was 330 to 410 kg / mm 2 .
【００３０】これに対して比較例である試料Ｎｏ．６
は、３０〜３００℃における熱膨張係数が１１０×１０
-7／℃、軟化点が４１０℃であり、実施例と同等の値を
示したものの、耐水性試験による段差が０．４０μｍと
大きく、また硬度が２９０ｋｇ／ｍｍ2 と低かった。On the other hand, the sample No. 6
Has a coefficient of thermal expansion of 110 × 10 at 30 to 300 ° C.
-7 / ° C. and softening point of 410 ° C., which were equivalent to those of the example. However, the step in the water resistance test was as large as 0.40 μm and the hardness was as low as 290 kg / mm 2 .
【００３１】これらの事実は本発明の磁気ヘッド用低融
点ガラスが、ＭｏＯ3 を含有するために耐水性が良好
で、しかも硬度が高いことを示している。These facts indicate that the low melting point glass for a magnetic head of the present invention has good water resistance and high hardness because it contains MoO 3 .
【００３２】なお熱膨張係数は、各ガラスを５φ×２０
ｍｍのロッド状に成形したものを試料とし、示差熱膨張
測定器によって測定した。軟化点は、各ガラスを粉砕し
て目開き１０５μｍの篩を通過した粉末状のものを試料
とし、示差熱分析計を用いて測定した。耐水性試験は次
のようにして行った。各ガラスを３０×５×２．５ｍｍ
の短冊状に成形し、その表面を研磨して試料とし、次い
で試料の半分を被覆し、９５℃以上の純水中で２時間煮
沸した後、触針式表面形状測定器によって発生した段差
を測定した。硬度は、耐水性試験に用いた試料と同じも
のを用意し、ビッカース硬度計により、荷重５０ｇ、１
０秒の条件で測定した。The thermal expansion coefficient of each glass was 5φ × 20
A sample formed into a rod shape of mm was used as a sample and measured by a differential thermal expansion meter. The softening point was measured using a differential thermal analyzer using a powdery material obtained by crushing each glass and passing through a sieve having a mesh size of 105 μm. The water resistance test was performed as follows. Each glass is 30 × 5 × 2.5mm
And polished the surface to make a sample, then cover half of the sample and boil it in pure water at 95 ° C or higher for 2 hours. It was measured. For the hardness, the same sample as that used in the water resistance test was prepared, and a Vickers hardness tester was used.
It was measured under the condition of 0 seconds.
【００３３】[0033]
【発明の効果】以上説明したように、本発明の磁気ヘッ
ド用低融点ガラスは、先記した諸特性を満足するもので
あり、特に耐水性に優れ、また高い硬度を有するため
に、磁気ヘッド、特にＭＩＧタイプの磁気ヘッドの接着
や固定に好適である。As described above, the low melting point glass for a magnetic head of the present invention satisfies the above-mentioned various properties, and is particularly excellent in water resistance and high hardness. In particular, it is suitable for bonding and fixing a MIG type magnetic head.
Claims (2)
硼珪酸系ガラスからなることを特徴とする磁気ヘッド用
低融点ガラス。1. A low melting point glass for a magnetic head, comprising a lead borosilicate glass containing 0.3 to 5% by weight of MoO 3 .
2 Ｏ3 ２〜１０％、ＳｉＯ2 ４〜２０％、ＴｅＯ2
０〜５％、Ａｌ2 Ｏ3 ０〜５％、ＺｎＯ０〜５％、
Ｎａ2 Ｏ ０〜３％、Ｋ2 Ｏ ０〜５％、Ｂｉ2 Ｏ3
０〜３５％、Ｆｅ2 Ｏ3 ０〜８％、ＭｎＯ2 ０〜２
％、ＭｏＯ3 ０．３〜５％からなることを特徴とする
請求項１の磁気ヘッド用低融点ガラス。2. PbO 40-85% by weight, B
2 O 3 2 to 10%, SiO 2 4 to 20%, TeO 2
0~5%, Al 2 O 3 0~5 %, ZnO0~5%,
Na 2 O 0-3%, K 2 O 0-5%, Bi 2 O 3
0~35%, Fe 2 O 3 0~8 %, MnO 2 0~2
2. The low melting point glass for a magnetic head according to claim 1, wherein the low melting point glass comprises 0.3 to 5% of MoO 3 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28794097A JPH11106236A (en) | 1997-10-02 | 1997-10-02 | Low melting point glass for magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28794097A JPH11106236A (en) | 1997-10-02 | 1997-10-02 | Low melting point glass for magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11106236A true JPH11106236A (en) | 1999-04-20 |
Family
ID=17723716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28794097A Pending JPH11106236A (en) | 1997-10-02 | 1997-10-02 | Low melting point glass for magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11106236A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6468935B1 (en) * | 1999-11-30 | 2002-10-22 | Kabushiki Kaisha Ohara | Optical glass |
| US7867934B2 (en) * | 2006-10-23 | 2011-01-11 | Ohara, Inc. | Optical glass |
| WO2022127235A1 (en) * | 2020-12-15 | 2022-06-23 | 广州市儒兴科技开发有限公司 | Glass powder, preparation method therefor and use thereof in topcon battery |
-
1997
- 1997-10-02 JP JP28794097A patent/JPH11106236A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6468935B1 (en) * | 1999-11-30 | 2002-10-22 | Kabushiki Kaisha Ohara | Optical glass |
| US7867934B2 (en) * | 2006-10-23 | 2011-01-11 | Ohara, Inc. | Optical glass |
| WO2022127235A1 (en) * | 2020-12-15 | 2022-06-23 | 广州市儒兴科技开发有限公司 | Glass powder, preparation method therefor and use thereof in topcon battery |
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