JPS61247640A - Glass composition - Google Patents

Glass composition

Info

Publication number
JPS61247640A
JPS61247640A JP8715785A JP8715785A JPS61247640A JP S61247640 A JPS61247640 A JP S61247640A JP 8715785 A JP8715785 A JP 8715785A JP 8715785 A JP8715785 A JP 8715785A JP S61247640 A JPS61247640 A JP S61247640A
Authority
JP
Japan
Prior art keywords
glass
gap
water resistance
glass composition
pbo
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
Application number
JP8715785A
Other languages
Japanese (ja)
Inventor
Masaaki Ashizawa
芦沢 正昭
Hirohide Yamada
山田 宏秀
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Proterial Ltd
Original Assignee
Hitachi Metals Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Metals Ltd filed Critical Hitachi Metals Ltd
Priority to JP8715785A priority Critical patent/JPS61247640A/en
Publication of JPS61247640A publication Critical patent/JPS61247640A/en
Pending legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL 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
    • C03C3/00Glass compositions
    • C03C3/04Glass compositions containing silica
    • C03C3/062Glass compositions containing silica with less than 40% silica by weight
    • C03C3/07Glass compositions containing silica with less than 40% silica by weight containing lead
    • C03C3/072Glass 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

PURPOSE:To obtain the titled glass composition having sufficient viscosity at a specified working temp., capable of flowing into a gap part to form a high-strength bonded part and having excellent water resistance by specifying the composition consisting of PbO, SiO2, B2O3 and Al2O3. CONSTITUTION:The glass composition consists of, by weight, 65-75% PbO, 15-25% SiO2, 5-18% B2O3 and 2-6% Al2O3 and is suitable for forming the gap of a floppy head by an inflow process. The glass composition has the viscosity sufficient for flowing into the gap part at about <=650 deg.C working temp. and has excellent water resistance. Accordingly, a magnetic head, etc., for a floppy disk, without nay problems in practical uses, can be formed with the composition.

Description

【発明の詳細な説明】[Detailed description of the invention]

〔産業上の利用分野〕 本発明は、フロッピーヘッド、ウェンチェスターヘッド
、コンポジットヘッド等のギャップを流入法で形成する
ことに適したガラス組成物に関するものである。 〔従来の技術〕 フロッピーへラドコアは第1図の様に磁気ギャップがガ
ラスで形成され、その上部にガラス溜部を設けて補強さ
れた構造になっている。この様な構造のフロッピーヘッ
ドコアは、例えば次の様な方法が従来から一般に行われ
[Industrial Application Field] The present invention relates to a glass composition suitable for forming a gap in a floppy head, a Wenchester head, a composite head, etc. by an inflow method. [Prior Art] As shown in FIG. 1, a floppy disk core has a structure in which a magnetic gap is formed of glass, and a glass reservoir is provided above the magnetic gap for reinforcement. Floppy head cores with this type of structure have traditionally been manufactured using the following methods.

【いる。スナわち、第2図の様に、あらかじめNi−Z
nフェライト等とセラミックスをガラス接着した長方形
のブロック旦と巻線窓用の切溝7を設けたブロックlを
所定のギャップ幅になる様に金属箔9を介して第3図の
様に突き合わせる。次に、第3図に示す様に巻線窓11
にガラス棒10をのせ、中性雰囲気中で加熱溶融するこ
とによシ、ギャップ部にガラスを流入すると同時に巻線
窓の下部にガラス溜部が生じ両コアブロック旦と及を接
着する。しかる後に金属箔の部分を切断し、セラミック
スを所定の形状に加工し、チップに切断する。チップは
ラッピングによって所定の厚さに仕上げ、第1図に示す
磁気ヘッドコアを製造する。 ところで、ブロック6は軟化点650〜700℃のガラ
スを使用し、750〜800℃で接着されているため・
ブロック5と旦を接着する温度(作業温度)はブロック
4を接着しているガラスの軟化点650℃以下で行いブ
ロック6のフェライト4とセラミックス5の接着ずれを
防ぐ必要がある・650℃で第3図のガラス棒10がギ
ャップ部に流入するためにはガラスの軟化点は550℃
以下が好ましい。この様な低融点ガラスとして、従来は
pbo−BO系ガラスにS】02.At2031znO
を配合したガラスが使用されている。(特開昭56−6
8914)。 〔発明が解決しようとする問題点〕 上記のPbO−B2O3系ガラスは例えば重量比で、P
b070〜75係、B20310〜15%、(SiO2
十AZ203 + ZnO) : 1 ’O〜20%の
場合軟化点が450℃以下であシ、作業温度が550°
〜650℃の場合、粘性が充分に低下して第3図のブロ
ック団と旦のギャップ部にガラスが適切に流入するため
所定の強度の接合が得られる。しかしながら、上記のP
bO−B2O,系ガラスはpboが多く、S s 02
が少ないため耐水性が劣如実用上問題であった。 本発明の目的は、作業温度が650℃以下で粘性が充分
にあり、ギャップ部に流入しく軟化点550℃以下)、
しかも耐水性が優れたガラスを提供することにある。 〔問題点を解決するだめの手段〕 本発明は重量比でPb065〜75チ、S + 021
5〜25%、B2O33〜18%、At2032〜6チ
からなることを特徴とするガラス組成物である。 以下、チは重量%を表わす。 本発明においては、従来の低融点ガラスであるPbO−
B2O5系の耐水性を改善するために、化学的耐久力に
優れるSiO□を多くした。また、従来のガラスではA
t203とZnOが配合されているが、両成分とも耐水
性を良くするため、その効果の大きいAt203のみを
配合し、ZnOの配合は無くしだ。 pboは65%以下になると軟化点が上昇し、75チ以
上になると耐水性が劣化するため65〜75チとした。 S + 02は15%以下になると耐水性が劣化し、2
5チ以上になると軟化点が上昇するため15〜25チと
した。 B2O5は5%以下であると粘性が大きくな9.18チ
以上であるとS + 02の配合量が15チ以下になっ
て耐水性が劣化するためB2O3は5〜18チとした。 At203は2%以下であると耐水性を向上させる効果
がなく、6%以上であると粘性が大きくなるためAt2
03は2〜6%とした。 ・ 3 ・ 〔実施例〕 第1表に示す各種配合組成のガラスを製造し、軟化点、
680℃で10分保持した場合のギャップ部へのガラス
の流入度合(第3図のブロック互と1(いづれもNi−
Znフェライト)の突き合わせ部の接着の度合)および
ガラスの耐水性テスト(40℃、90%R−H,1’0
00 h )を行った。その結果を第1表に示す。 第1表で流入度合はガラスが完全にギャップ部に流入し
て空隙のない場合を○、流入はしているが空隙の多い場
合を△、不完全流入で接着不良の場合を×で表示した。 まん、耐水性は、変化のないものを○、変色の激しいも
のを×で表示した。 ・ 4 ・ 〔発明の効果〕 本発明によれば、従来不充分であったガラスの耐水性が
大幅に向上し、実用上問題のないフロッピー用磁気ヘッ
ドを提供することができる。
[There is. As shown in Figure 2, the Ni-Z
A rectangular block 1 made of n-ferrite etc. and ceramic bonded to glass and a block 1 provided with a cut groove 7 for a winding window are butted together with a metal foil 9 interposed therebetween as shown in Fig. 3 so as to have a predetermined gap width. . Next, as shown in FIG.
By placing a glass rod 10 on the core block and heating and melting it in a neutral atmosphere, the glass flows into the gap and at the same time a glass reservoir is created at the lower part of the winding window and the two core blocks are bonded together. Thereafter, the metal foil portion is cut, the ceramic is processed into a predetermined shape, and the ceramic is cut into chips. The chip is finished to a predetermined thickness by lapping, and the magnetic head core shown in FIG. 1 is manufactured. By the way, block 6 uses glass with a softening point of 650 to 700°C and is bonded at 750 to 800°C.
The temperature (working temperature) at which the block 5 and the plate are bonded must be below the softening point of 650°C for the glass to which the block 4 is bonded to prevent the adhesion of the ferrite 4 and the ceramic 5 of the block 6. In order for the glass rod 10 in Figure 3 to flow into the gap, the softening point of the glass must be 550°C.
The following are preferred. Conventionally, pbo-BO glass has been used as such low melting point glass. At2031znO
Glass containing the following is used. (Unexamined Japanese Patent Publication No. 56-6
8914). [Problems to be Solved by the Invention] The above PbO-B2O3 glass has, for example, a weight ratio of Pb
b070-75 section, B20310-15%, (SiO2
10AZ203 + ZnO): 1'O ~ 20%, the softening point is below 450℃, the working temperature is 550℃
When the temperature is 650 DEG C., the viscosity is sufficiently reduced and the glass appropriately flows into the gap between the block group and the block shown in FIG. 3, so that a bond with a predetermined strength can be obtained. However, the above P
bO-B2O, glass has a lot of pbo, S s 02
Because of the low water resistance, it was a practical problem. The object of the present invention is to have sufficient viscosity when the working temperature is 650°C or lower, and to prevent it from flowing into the gap (with a softening point of 550°C or lower);
Moreover, the objective is to provide glass with excellent water resistance. [Means for solving the problem] The present invention has a weight ratio of Pb065 to 75 and S+021.
5 to 25%, B2O3 to 18%, and At2032 to 6%. Hereinafter, ``chi'' represents weight %. In the present invention, PbO-
In order to improve the water resistance of the B2O5 system, SiO□, which has excellent chemical durability, was increased. In addition, with conventional glass, A
It contains T203 and ZnO, but in order to improve the water resistance of both components, only At203, which has a great effect, is blended, and ZnO is not blended. When the pbo is less than 65%, the softening point increases, and when it becomes more than 75%, the water resistance deteriorates, so it was set to 65 to 75%. When S + 02 becomes less than 15%, water resistance deteriorates, and 2
If the thickness exceeds 5 inches, the softening point increases, so the range was set at 15 to 25 inches. If the B2O5 content is 5% or less, the viscosity becomes high, and if it is 9.18% or more, the amount of S+02 mixed becomes less than 15% and the water resistance deteriorates, so the B2O3 content was set to 5 to 18%. If At203 is less than 2%, it will not have the effect of improving water resistance, and if it is more than 6%, the viscosity will increase.
03 was set at 2 to 6%.・ 3 ・ [Example] Glasses with various compositions shown in Table 1 were manufactured, and the softening point,
The degree of inflow of glass into the gap when held at 680°C for 10 minutes (both blocks are 1 (Ni-
degree of adhesion at the butt part of Zn ferrite) and water resistance test of glass (40°C, 90% R-H, 1'0
00h) was carried out. The results are shown in Table 1. In Table 1, the degree of inflow is indicated by ○ when the glass completely flows into the gap and there are no voids, △ when the glass flows but there are many voids, and × when the glass flows incompletely and there is poor adhesion. . Regarding water resistance, those with no change were marked with ○, and those with severe discoloration were marked with ×. 4. [Effects of the Invention] According to the present invention, the water resistance of glass, which was conventionally insufficient, is greatly improved, and it is possible to provide a magnetic head for floppy disks that does not cause any practical problems.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はフロッピー磁気ヘッドコアの斜視図、第2図は
ギャップを形成するためのセラミックスとフェライト接
合ブロックおよび巻線窓用切溝を形成したフェライトブ
ロックの斜視図、第3図は上記ブロックを付き合わせて
ガラス棒を設置した状態を示す斜視図である。 1:磁気ギャップ、2:補強ガラス、3,4:フェライ
ト、5:セラミックス、6:接合ブロック、7:切シ溝
、9:金属箔、1〇二巻線窓。 、 7 。 第  1 図 第2図 第3図 9:金属箔
Figure 1 is a perspective view of a floppy magnetic head core, Figure 2 is a perspective view of a ceramic and ferrite bonding block for forming a gap, and a ferrite block with a kerf for a winding window, and Figure 3 is a perspective view of the above block. It is a perspective view showing a state in which a glass rod is also installed. 1: Magnetic gap, 2: Reinforced glass, 3, 4: Ferrite, 5: Ceramics, 6: Joint block, 7: Cut groove, 9: Metal foil, 102 winding window. , 7. Figure 1 Figure 2 Figure 3 Figure 9: Metal foil

Claims (1)

【特許請求の範囲】[Claims] PbO:65〜75重量%、SiO_2:15〜25重
量%、B_2O_3:5〜18重量%、Al_2O_3
:2〜6重量%からなるガラス組成物。
PbO: 65-75% by weight, SiO_2: 15-25% by weight, B_2O_3: 5-18% by weight, Al_2O_3
: Glass composition consisting of 2 to 6% by weight.
JP8715785A 1985-04-23 1985-04-23 Glass composition Pending JPS61247640A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8715785A JPS61247640A (en) 1985-04-23 1985-04-23 Glass composition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8715785A JPS61247640A (en) 1985-04-23 1985-04-23 Glass composition

Publications (1)

Publication Number Publication Date
JPS61247640A true JPS61247640A (en) 1986-11-04

Family

ID=13907152

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8715785A Pending JPS61247640A (en) 1985-04-23 1985-04-23 Glass composition

Country Status (1)

Country Link
JP (1) JPS61247640A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01199309A (en) * 1988-02-03 1989-08-10 Sanyo Electric Co Ltd Glass for joining core for composite type magnetic head

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01199309A (en) * 1988-02-03 1989-08-10 Sanyo Electric Co Ltd Glass for joining core for composite type magnetic head

Similar Documents

Publication Publication Date Title
EP1291329A1 (en) Glass composition, sealing glass for magnetic head and magnetic head
JPS6370912A (en) Glass for joining magnetic head gap
JPS61247640A (en) Glass composition
JPH0475177B2 (en)
JPH0152808B2 (en)
JPS6278128A (en) Water-resistant and low-temperature softening glass composition
JPS61247641A (en) Glass composition
JPS6226089B2 (en)
JPS615406A (en) Composit-type magnetic head
JPS6029654B2 (en) Magnetic head manufacturing method
JPS63206330A (en) Moisture-proof low-melting glass composition for magnetic head
JPS61196411A (en) Magnetic head
DE2655480A1 (en) PROCEDURE FOR PERMANENTLY JOINING MAGNETIC CERAMICS
JPS62103808A (en) Bonding glass for assembling composite type magnetic head
JP2740697B2 (en) Moisture resistant low melting glass composition for magnetic head and magnetic head
JPS6291444A (en) Glass for welding ferrite
JPS59146431A (en) Magnetic head
JPS6354654B2 (en)
JPS63148405A (en) Production of magnetic head and glass composition for magnetic head
JPS6345147A (en) Bonding glass for magnetic head
KR950001663B1 (en) Glass solders using magnetic head
JPS6335432A (en) Production of magnetic head and glass composition for magnetic head
JPS6335433A (en) Production of magnetic head and glass composition for magnetic head
JPS61281043A (en) Glass for welding of sendust
KR950001664B1 (en) Glass solders using magnetic head