JPH0826769A - Glass for bonding magnetic head - Google Patents
Glass for bonding magnetic headInfo
- Publication number
- JPH0826769A JPH0826769A JP18633794A JP18633794A JPH0826769A JP H0826769 A JPH0826769 A JP H0826769A JP 18633794 A JP18633794 A JP 18633794A JP 18633794 A JP18633794 A JP 18633794A JP H0826769 A JPH0826769 A JP H0826769A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- magnetic head
- head
- thermal expansion
- water resistance
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C8/00—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
- C03C8/24—Fusion seal compositions being frit compositions having non-frit additions, i.e. for use as seals between dissimilar materials, e.g. glass and metal; Glass solders
- C03C8/245—Fusion seal compositions being frit compositions having non-frit additions, i.e. for use as seals between dissimilar materials, e.g. glass and metal; Glass solders containing more than 50% lead oxide, by weight
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
- C03C3/07—Glass compositions containing silica with less than 40% silica by weight containing lead
- C03C3/072—Glass compositions containing silica with less than 40% silica by weight containing lead containing boron
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は磁気ヘッド用ガラスに関
し、より詳しくは二次接着用ガラスとして用いられる磁
気ヘッド接着用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 magnetic head glass, and more particularly to a magnetic head glass used as a secondary bonding glass.
【０００２】[0002]
【従来の技術】磁気ヘッドの製造における接合や充填部
材として、従来より接着用ガラスが用いられている。こ
のような接着用ガラスを用いた磁気ヘッドとして、例え
ば図１に示すようなフロッピーディスク（ＦＤＤ）用ヘ
ッドや図２に示すようなハードディスク（ＨＤＤ）用ヘ
ッドがある。2. Description of the Related Art Adhesive glass has been conventionally used as a joining or filling member in the manufacture of magnetic heads. As a magnetic head using such an adhesive glass, for example, there is a floppy disk (FDD) head as shown in FIG. 1 and a hard disk (HDD) head as shown in FIG.
【０００３】ＦＤＤ用ヘッドを製造する場合、まずフェ
ライト製の磁気コアの半体１１ａ、１１ｂ、１１’ａ、
１１’ｂ同士をギャップスペーサー１２、１２’を介し
て一次接着用ガラス１３、１３’で接合固定してＲ（読
み出し）／Ｗ（書き込み）用コア１１及びイレース用コ
ア１１’をそれぞれ作製し、これらを二次接着用ガラス
１４で接着固定してヘッド１０を形成する。When manufacturing a head for an FDD, first of all, the ferrite magnetic core halves 11a, 11b, 11'a,
11'b are bonded and fixed to each other with the primary bonding glasses 13 and 13 'through the gap spacers 12 and 12' to produce the R (read) / W (write) core 11 and the erase core 11 ', The head 10 is formed by bonding and fixing these with the glass 14 for secondary bonding.
【０００４】またＨＤＤ用ヘッドの場合は、フェライト
等の磁性材料からなる磁気コアの半体同士をギャップス
ペーサーを介して一次接着用ガラスで接着して磁気コア
２１を作製し、これを非磁性セラミック材や磁性フェラ
イト材等からなるスライダー２２の切り込み部内に保持
し、二次接着用ガラス２３を空隙に充填して磁気コアを
接着固定させ、ヘッド２０を形成する。In the case of an HDD head, magnetic core halves made of a magnetic material such as ferrite are bonded to each other with a primary bonding glass via a gap spacer to prepare a magnetic core 21, which is made of a non-magnetic ceramic. The head 20 is formed by holding the slider 22 made of a magnetic material or a magnetic ferrite material in the cut portion, filling the voids with the secondary bonding glass 23, and bonding and fixing the magnetic core.
【０００５】ところで磁気ヘッドの製造に用いられる二
次接着用ガラスとしては、磁気ヘッドの材質であるフェ
ライトに適合した熱膨張係数を有し、しかも熱処理によ
って一次接着用ガラスが軟化流動してギャップ長が大き
くなったり、実効トラック幅が小さくなることがないよ
うに、一次接着用ガラスの屈伏点以下の温度で熱処理で
きる低融点のガラスが用いられる。By the way, the secondary bonding glass used for manufacturing the magnetic head has a coefficient of thermal expansion adapted to ferrite, which is a material of the magnetic head, and the primary bonding glass is softened and fluidized by heat treatment to cause a gap length. A glass having a low melting point that can be heat-treated at a temperature equal to or lower than the yielding point of the primary bonding glass is used so that the temperature does not increase and the effective track width does not decrease.
【０００６】[0006]
【発明が解決しようとする課題】しかしながらフェライ
トに適合するような高い熱膨張係数を有する低融点ガラ
スは一般に耐洗浄液性や耐水性が低く、このようなガラ
スを二次接着用ガラスとして用いた場合、ヘッド組立後
の洗浄工程等でガラスが変質したり、大気中の水分と反
応してガラス表面に異物が析出しディスク表面を損傷さ
せる等の問題が生じる。However, low-melting-point glass having a high coefficient of thermal expansion that is compatible with ferrite generally has low cleaning liquid resistance and water resistance, and when such glass is used as a glass for secondary bonding. In addition, there are problems that the glass is deteriorated in a cleaning process after the head is assembled, or foreign matter is deposited on the glass surface by reacting with moisture in the atmosphere to damage the disk surface.
【０００７】本発明の目的は、フェライトに適合した熱
膨張係数を有し、且つ耐洗浄液性や耐水性の良い、磁気
ヘッドの二次接着用ガラスとして好適な磁気ヘッド接着
用ガラスを提供することである。It is an object of the present invention to provide a magnetic head bonding glass which has a coefficient of thermal expansion suitable for ferrite and is excellent in cleaning liquid resistance and water resistance and which is suitable as a glass for secondary bonding of a magnetic head. Is.
【０００８】[0008]
【課題を解決するための手段】本発明者等は上記目的を
達成するために種々の研究を行った結果、ＰｂＯ−Ｓｉ
Ｏ2 −Ｂ2 Ｏ3 −Ａｌ2 Ｏ3 系の低融点ガラスに特定量
のＣｕＯを含有せしめることにより、耐洗浄液性や耐水
性が良好で、しかも適当な膨張係数を持つ接着用ガラス
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 researches conducted by the present inventors in order to achieve the above object, PbO-Si is obtained.
By containing a specific amount of CuO in the O 2 —B 2 O 3 —Al 2 O 3 -based low melting point glass, an adhesive glass having good cleaning liquid resistance and water resistance and having an appropriate expansion coefficient can be obtained. Therefore, it is proposed as the present invention.
【０００９】即ち、本発明の磁気ヘッド接着用ガラス
は、重量百分率でＰｂＯ ６５〜７７％、ＳｉＯ2 １
３．５〜２０％、Ｂ2 Ｏ3 ２〜８％、Ａｌ2 Ｏ3 ０．１
〜３％、ＺｎＯ ０〜４％、Ｂｉ2 Ｏ3 ０〜１０％、Ｔ
ｅＯ2 ０〜１０％、ＣｕＯ ０．０５〜３％からなるこ
とを特徴とする。That is, the glass for adhering a magnetic head of the present invention contains PbO 65 to 77% and SiO 2 1 in weight percentage.
3.5~20%, B 2 O 3 2~8 %, Al 2 O 3 0.1
~ 3%, ZnO 0-4%, Bi 2 O 3 0-10%, T
eO 2 0 to 10%, CuO 0.05 to 3%.
【００１０】[0010]
【作用】本発明の低融点ガラスは、３０〜３００℃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９０〜１１０×１０-7/ ℃であり、
また軟化点が４５０〜４９０℃であるため一次接着用ガ
ラスの屈伏点（通常５５０〜５８０℃）以下である５５
０℃以下で熱処理することが可能である。しかもＣｕＯ
を含有するため、耐洗浄液性や耐水性が非常に優れてい
る。The low melting point glass of the present invention has a coefficient of thermal expansion of 30 to 300 ° C. that of ferrite (100 to 120 ×).
10 -7 / ℃) is 90~110 × 10 -7 / ℃ to meet,
Further, since the softening point is 450 to 490 ° C., it is lower than the yield point (usually 550 to 580 ° C.) of the glass for primary bonding 55.
It is possible to perform heat treatment at 0 ° C. or lower. Moreover, CuO
Therefore, it has excellent cleaning liquid resistance and water resistance.
【００１１】次に、本発明の低融点ガラスの組成を上記
のように限定した理由を以下に示す。Next, the reasons why the composition of the low melting point glass of the present invention is limited as described above will be shown below.
【００１２】ＰｂＯはガラスを低融点化させる成分であ
り、その含有量は６５〜７７％である。ＰｂＯが６５％
より少ないと軟化点が高くなり、７７％より多いと耐水
性が悪くなる。PbO is a component that lowers the melting point of glass, and its content is 65 to 77%. 65% PbO
If it is less, the softening point will be higher, and if it is more than 77%, the water resistance will be poor.
【００１３】ＳｉＯ2 はガラス化範囲を広げる成分であ
り、その含有量は１３．５〜２０％である。ＳｉＯ2 が
１３．５％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低融点化が困難になる。SiO 2 is a component that expands the vitrification range, and its content is 13.5 to 20%. If the SiO 2 content is less than 13.5%, the water resistance will be poor, and if it exceeds 20%, the softening point will be high, making it difficult to lower the melting point.
【００１４】Ｂ2 Ｏ3 はガラスを安定化させる成分であ
り、その含有量は２〜８％である。Ｂ2 Ｏ3 が２％より
少ないとガラスが不安定になり、８％より多いと耐水性
が悪くなる。B 2 O 3 is a component that stabilizes the glass, and its content is 2 to 8%. When B 2 O 3 is less than 2%, the glass becomes unstable, and when it is more than 8%, the water resistance becomes poor.
【００１５】Ａｌ2 Ｏ3 はガラスの耐洗浄液性や耐水性
を高める成分であり、その含有量は０．１〜３％であ
る。Ａｌ2 Ｏ3 が０．１％より少ないと上記した効果が
得られず、３％より多いとガラスの軟化点が高くなって
５５０℃以下で熱処理できなくなる。Al 2 O 3 is a component that enhances the cleaning liquid resistance and water resistance of glass, and its content is 0.1 to 3%. If Al 2 O 3 is less than 0.1%, the above effect cannot be obtained, and if it exceeds 3%, the softening point of the glass becomes high and heat treatment cannot be performed at 550 ° C. or lower.
【００１６】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０〜４％であ
る。ＺｎＯが４％より多いとガラスが失透し易くなる。ZnO is a component that lowers the melting point of glass without increasing its coefficient of thermal expansion, and its content is 0 to 4%. If ZnO is more than 4%, the glass tends to devitrify.
【００１７】Ｂｉ2 Ｏ3 はガラスの軟化点を下げる作用
があり、その含有量は０〜１０％である。Ｂｉ2 Ｏ3 の
含有量が１０％より多いとガラスが着色して不透明にな
り、ギャップ深さの測定が困難になる。Bi 2 O 3 has a function of lowering the softening point of glass, and its content is 0 to 10%. If the content of Bi 2 O 3 is more than 10%, the glass becomes colored and becomes opaque, making it difficult to measure the gap depth.
【００１８】ＴｅＯ2 は鉛系ガラスの耐水性を改善する
作用があり、その含有量は０〜１０％である。ＴｅＯ2
が１０％より多いと軟化点が高くなる。TeO 2 has the effect of improving the water resistance of lead-based glass, and its content is 0-10%. TeO 2
Is more than 10%, the softening point becomes high.
【００１９】ＣｕＯはガラスの耐洗浄液性や耐水性を高
める成分であり、その含有量は０．０５〜３％である。
ＣｕＯの含有量が０．０５％より少ないとその効果がな
く、３％より多いとガラスが失透し易くなりガラスが不
安定になる。CuO is a component that enhances the cleaning liquid resistance and water resistance of glass, and its content is 0.05 to 3%.
If the content of CuO is less than 0.05%, the effect is not obtained, and if it is more than 3%, the glass tends to devitrify and the glass becomes unstable.
【００２０】[0020]
【実施例】以下、本発明の磁気ヘッド接着用ガラスを実
施例に基づいて説明する。EXAMPLES The glass for magnetic head adhesion of the present invention will be described below based on examples.
【００２１】表１は本発明の実施例（試料Ｎｏ．１〜
４）及び比較例（試料Ｎｏ．５及び６）を示すものであ
る。Table 1 shows examples of the present invention (Sample Nos. 1 to 1).
4) and Comparative Examples (Sample Nos. 5 and 6).
【００２２】[0022]
【表１】 [Table 1]
【００２３】表のＮｏ．１〜６の各試料は次のようにし
て調製した。No. in the table Each sample of 1 to 6 was prepared as follows.
【００２４】まず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坩堝に入れ、１１００℃で１時
間溶融し、所定の形状に成形して試料を作製した後、熱
膨張係数、軟化点、熱処理温度、耐洗浄液性及び耐水性
を測定した。First, a raw material batch prepared so as to have the composition shown in the table in percentage by weight was placed in a platinum crucible, melted at 1100 ° C. for 1 hour, molded into a predetermined shape to prepare a sample, and then a coefficient of thermal expansion and softening. The spot, heat treatment temperature, cleaning liquid resistance and water resistance were measured.
【００２５】表から明らかなように実施例であるＮｏ．
１〜４の各試料は熱膨張係数が９０〜１０５×１０-7/
℃、軟化点が４６０〜４７０℃、熱処理温度が５１０〜
５２０℃の値を示し、また耐洗浄液性及び耐水性が良好
であった。これに対して比較例であるＮｏ．５及び６の
各試料は熱膨張係数が１００×１０-7/ ℃及び９０×１
０-7/ ℃、軟化点が４７０℃及び４６５℃、熱処理温度
が何れも５２０℃であり、実施例と同等の値を示した
が、耐洗浄液性と耐水性はともに不良であった。As is apparent from the table, No.
The thermal expansion coefficient of each sample of 1 to 4 is 90 to 105 × 10 −7 /
℃, softening point 460-470 ℃, heat treatment temperature 510-
The value was 520 ° C., and the cleaning liquid resistance and water resistance were good. On the other hand, No. The thermal expansion coefficient of each of samples 5 and 6 is 100 × 10 −7 / ° C. and 90 × 1
The temperature was 0 -7 / ° C, the softening points were 470 ° C and 465 ° C, and the heat treatment temperatures were 520 ° C, which were the same values as those of the examples, but both the cleaning liquid resistance and the water resistance were poor.
【００２６】これらの事実は、本発明がフェライトの熱
膨張係数に適合し、しかも耐洗浄液性と耐水性が良好で
あることを示している。These facts show that the present invention conforms to the coefficient of thermal expansion of ferrite, and has good cleaning liquid resistance and water resistance.
【００２７】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試料を用いて平均線熱膨張係
数測定器によって測定した。軟化点は、各ガラスを粉砕
し、目開き１０５μｍの篩を通過させて粉末状の試料を
用意し、示差熱分析計を用いて測定した。熱処理温度
は、ヘッドコアの固定に必要な流動性が得られる温度、
即ちガラスの粘度が１０4 ポアズを示す時の温度を高温
粘性測定器により測定した。耐洗浄液性は次のようにし
て評価した。まず各ガラスを１０×２５×３ｍｍの短冊
状に成形し、さらに表面を研磨して試料とした。次いで
試料の半分を被覆し、市販のアルカリ洗浄液を蒸留水で
２％に希釈した５０℃の液中に２時間放置した後、触針
式表面形状測定器によって発生した段差を測定し、その
段差が０．５μｍ以下の場合は良、０．５μｍを超える
場合は不良とした。耐水性は耐洗浄液性の評価に使用し
た試料と同様にして半分を被覆した試料を用意し、次い
でこれを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、その
段差が０．３μｍ以下の場合は良、０．３μｍを超える
場合は不良とした。The thermal expansion coefficient of each glass is 5φ × 20.
It measured with the average linear thermal expansion coefficient measuring device using the sample shape | molded by the rod shape of mm. The softening point was measured using a differential thermal analyzer by crushing each glass, passing through a sieve having an opening of 105 μm to prepare a powdery sample. The heat treatment temperature is a temperature at which the fluidity necessary for fixing the head core is obtained,
That is, the temperature when the viscosity of the glass shows 10 4 poise was measured by a high temperature viscometer. The cleaning liquid resistance was evaluated as follows. First, each glass was formed into a strip shape of 10 × 25 × 3 mm, and the surface was further polished to obtain a sample. Then, half of the sample was coated and left for 2 hours in a 50 ° C. solution in which a commercially available alkaline cleaning solution was diluted to 2% with distilled water, and then the level difference generated by the stylus type surface profile measuring instrument was measured. Is 0.5 μm or less, it is good, and if it exceeds 0.5 μm, it is bad. For water resistance, prepare a half-coated sample in the same manner as the sample used for the evaluation of cleaning liquid resistance, and then boil this in pure water at 95 ° C or higher for 2 hours, and then use a stylus type profilometer. The generated step was measured, and when the step was 0.3 μm or less, it was judged as good, and when it exceeded 0.3 μm, it was judged as bad.
【００２８】[0028]
【発明の効果】以上説明したように、本発明の磁気ヘッ
ド接着用ガラスは、フェライトに適合した熱膨張係数を
有し、一次接着用ガラスの屈伏点以下の温度で熱処理す
ることができ、しかも耐洗浄液性や耐水性が良好である
ため、特にＦＤＤヘッドやＨＤＤヘッド等の製造工程に
おいて使用される二次接着用ガラスとして好適である。As described above, the glass for magnetic head adhesion of the present invention has a coefficient of thermal expansion suitable for ferrite, and can be heat-treated at a temperature not higher than the yield point of the glass for primary adhesion. Since it has good cleaning liquid resistance and water resistance, it is particularly suitable as a secondary bonding glass used in the manufacturing process of FDD heads, HDD heads and the like.
【図１】ＦＤＤヘッドを示す説明図である。FIG. 1 is an explanatory diagram showing an FDD head.
【図２】ＨＤＤヘッドを示す説明図である。FIG. 2 is an explanatory diagram showing an HDD head.
１０ ＦＤＤ用ヘッド １１ Ｒ／Ｗ用コア １１’イレース用コア １４ 二次接着用ガラス ２０ ＨＤＤ用ヘッド ２１ 磁気コア ２２ スライダー ２３ 二次接着用ガラス 10 FDD Head 11 R / W Core 11 'Erase Core 14 Secondary Adhesion Glass 20 HDD Head 21 Magnetic Core 22 Slider 23 Secondary Adhesion Glass
Claims (1)
ｉＯ2 １３．５〜２０％、Ｂ2 Ｏ3 ２〜８％、Ａｌ2 Ｏ
3 ０．１〜３％、ＺｎＯ ０〜４％、Ｂｉ2Ｏ3 ０〜１
０％、ＴｅＯ2 ０〜１０％、ＣｕＯ ０．０５〜３％か
らなることを特徴とする磁気ヘッド接着用ガラス。1. PbO 65-77%, S by weight percentage
iO 2 13.5~20%, B 2 O 3 2~8%, Al 2 O
3 0.1-3%, ZnO 0-4%, Bi 2 O 3 0-1
0%, TeO 2 0 to 10%, CuO 0.05 to 3%, a magnetic head bonding glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18633794A JPH0826769A (en) | 1994-07-14 | 1994-07-14 | Glass for bonding magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18633794A JPH0826769A (en) | 1994-07-14 | 1994-07-14 | Glass for bonding magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0826769A true JPH0826769A (en) | 1996-01-30 |
Family
ID=16186589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18633794A Pending JPH0826769A (en) | 1994-07-14 | 1994-07-14 | Glass for bonding magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0826769A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6163106A (en) * | 1997-09-09 | 2000-12-19 | Asahi Glass Company Ltd. | Color cathode ray tube and water resistant glass frit |
| EP1178019A1 (en) * | 1999-11-30 | 2002-02-06 | Kabushiki Kaisha Ohara | Optical glass |
| WO2011052336A1 (en) * | 2009-10-29 | 2011-05-05 | 日本山村硝子株式会社 | Glass composition and conductor-forming composition using same |
-
1994
- 1994-07-14 JP JP18633794A patent/JPH0826769A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6163106A (en) * | 1997-09-09 | 2000-12-19 | Asahi Glass Company Ltd. | Color cathode ray tube and water resistant glass frit |
| EP1178019A1 (en) * | 1999-11-30 | 2002-02-06 | Kabushiki Kaisha Ohara | Optical glass |
| EP1178019A4 (en) * | 1999-11-30 | 2006-04-05 | Ohara Kk | Optical glass |
| WO2011052336A1 (en) * | 2009-10-29 | 2011-05-05 | 日本山村硝子株式会社 | Glass composition and conductor-forming composition using same |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0430206B1 (en) | Sealing glass | |
| JPH0826769A (en) | Glass for bonding magnetic head | |
| JPH0826771A (en) | Glass for bonding magnetic head | |
| JP4273620B2 (en) | Substrate glass | |
| JPS60255643A (en) | Lead-free low-melting glass | |
| JPH0372023B2 (en) | ||
| JP2004155597A (en) | Low-melting glass for magnetic recording head | |
| JP3296679B2 (en) | Adhesive glass | |
| JP2003095692A (en) | Cover glass for optical semiconductor | |
| JP2944716B2 (en) | Adhesive glass | |
| JP2968022B2 (en) | Adhesive glass | |
| JPH11106236A (en) | Low melting point glass for magnetic head | |
| JPH0761836A (en) | Glass for adhering ferrite | |
| JP2740697B2 (en) | Moisture resistant low melting glass composition for magnetic head and magnetic head | |
| JPH0264037A (en) | Glass of small thermoelasticity | |
| JPH0432025B2 (en) | ||
| JP2987804B2 (en) | Glass substrate for information recording | |
| JPH0891868A (en) | Glass for sticking ferrite | |
| JP3190961B2 (en) | Low temperature fusing glass composition | |
| JPH05330850A (en) | Ferrite bonding glass | |
| JPH0459637A (en) | Low-melting glass | |
| JPH04362039A (en) | Glass for magnetic head having low melting point | |
| JPH11228168A (en) | Low melting point glass for magnetic head | |
| JPS6335465A (en) | Glass for sealing magnetic head | |
| JPS61191539A (en) | Glass composition for binding ferrite |