JPH0428654B2 - - Google Patents
Info
- Publication number
- JPH0428654B2 JPH0428654B2 JP2610085A JP2610085A JPH0428654B2 JP H0428654 B2 JPH0428654 B2 JP H0428654B2 JP 2610085 A JP2610085 A JP 2610085A JP 2610085 A JP2610085 A JP 2610085A JP H0428654 B2 JPH0428654 B2 JP H0428654B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- sendust
- magnetic head
- present
- expansion coefficient
- 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
Links
- 239000011521 glass Substances 0.000 claims description 33
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- 229910000272 alkali metal oxide Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229910000702 sendust Inorganic materials 0.000 description 10
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910018084 Al-Fe Inorganic materials 0.000 description 1
- 229910018192 Al—Fe Inorganic materials 0.000 description 1
- 229910021193 La 2 O 3 Inorganic materials 0.000 description 1
- 206010027439 Metal poisoning Diseases 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000005816 glass manufacturing process Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 208000008127 lead poisoning Diseases 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000006060 molten glass Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight 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)
- Magnetic Heads (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、特に磁気ヘツドのボンデイング用ガ
ラスとして有用な高膨張ガラス組成物に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to high expansion glass compositions which are particularly useful as bonding glasses for magnetic heads.
磁気記録媒体として従来の酸化物磁気テープか
らメタルおよび蒸着テープが使われるに伴ない、
記録読み取り用磁気ヘツド材も単結晶フエライト
から磁束密度が大きいセンダストやアモルフアス
合金に転換されつつある。
With the shift from traditional oxide magnetic tape to metal and vapor-deposited tape as magnetic recording media,
The magnetic head material for recording and reading is also being changed from single-crystal ferrite to sendust and amorphous alloys, which have a high magnetic flux density.
センダストを磁気ヘツドに使用する場合、セン
ダスト自体は非常に脆く摩耗し易いため、一般に
は第１図に示すように、センダスト層１の両側に
ガラス２を接合して磁気ヘツド３が構成されてい
る。このような磁気ヘツドのセンダスト層保持ガ
ラスは線膨張係数がセンダストに近い140×10-7
前後の値をもつこと、耐摩耗性に優れていること
が必要であり、また透明であることが望ましい。 When Sendust is used in a magnetic head, since Sendust itself is very brittle and easily worn out, the magnetic head 3 is generally constructed by bonding glass 2 to both sides of a Sendust layer 1, as shown in Figure 1. . The Sendust layer-retaining glass of such a magnetic head has a linear expansion coefficient of 140×10 -7 , which is close to that of Sendust.
It is necessary that the material has a value around that value, that it has excellent abrasion resistance, and that it is desirably transparent.
このような磁気ヘツドガラスとしては、Agを
含む結晶化ガラスやPbOを含むガラスが従来使用
されている。 As such magnetic head glasses, crystallized glass containing Ag and glass containing PbO have conventionally been used.
Agを含む結晶化ガラスは不透明である上に摩
耗し易いという問題があり、またPbOを含むガラ
スは合金と反応する上耐摩耗性も良くないという
問題がある。
Crystallized glass containing Ag has the problem of being opaque and prone to wear, while glass containing PbO has the problem of reacting with alloys and having poor wear resistance.
本発明に係るガラスはSiO250〜70モル％（以
下単位はモル％）、B2O30〜６％，ZnO8〜15％，
アルカリ金属酸化物18〜25％を主要成分としてい
る。これら主要成分以外に例えばMgO，CaO，
BaO，SrO，Al2O3，TiO2，ZrO2，La2O3，
Sb2O3，As2O3などの成分を含有することができ
る。
The glass according to the present invention contains 50 to 70 mol% of SiO 2 (the unit is mol % below), 0 to 6% of B 2 O 3 , 8 to 15% of ZnO,
The main component is 18-25% alkali metal oxide. In addition to these main components, for example, MgO, CaO,
BaO, SrO, Al 2 O 3 , TiO 2 , ZrO 2 , La 2 O 3 ,
It can contain components such as Sb 2 O 3 and As 2 O 3 .
以下本発明ガラスの各組成成分についてさらに
詳しく説明する。SiO2はガラスの骨格を成すも
ので含有量が70％を越えるとガラスの軟化温度が
高くなり、且つ膨張係数が小さくなつて所期の膨
張係数が得られなくなる。また、50％よりも少な
いと耐候性、耐薬品性の乏しい不安定なガラスと
なるので、本発明ではSiO2の含有量は50〜70％
の範囲を必須とする。B2O3は少量含有させるこ
とによつてガラスの耐久性が向上するため添加す
ることが望ましいが、６％を越える膨張係数が小
さくなつて所期の高膨張率を得ることが困難にな
るので０〜６％の範囲内にすることが必要であ
る。ZnOは、含有量が８％よりも少ない場合はガ
ラスの化学的耐久性、温度特性が悪化し、また15
％を越えるとガラスの溶解性が悪くなるのでZnO
の含有量は８〜15％とする。 Each compositional component of the glass of the present invention will be explained in more detail below. SiO 2 forms the skeleton of glass, and if the content exceeds 70%, the softening temperature of the glass increases and the expansion coefficient decreases, making it impossible to obtain the desired expansion coefficient. In addition, if it is less than 50%, the glass will be unstable with poor weather resistance and chemical resistance, so in the present invention, the SiO 2 content is 50 to 70%.
Requires a range of . It is desirable to add B 2 O 3 because it improves the durability of the glass by containing a small amount of B 2 O 3, but the expansion coefficient exceeding 6% becomes small and it becomes difficult to obtain the desired high expansion coefficient. Therefore, it is necessary to keep it within the range of 0 to 6%. If the ZnO content is less than 8%, the chemical durability and temperature characteristics of the glass will deteriorate;
%, the solubility of the glass deteriorates, so ZnO
The content of is 8 to 15%.
またアルカリ金属酸化物R2O（ＲはLi，Na，
Ｋ，Cs，Rb）はガラスの膨張係数を大きくする
上に必要な成分であるが、あまり量が多いと化学
的耐久性が急激に低下するので、R2Oは合計量で
18〜25％の範囲内とすることが必要である。ただ
し、R2OとしてNa2Oを用いる場合は含有量が多
くなると耐候性が低下するので15％以下とするこ
とが望ましい。 Also, alkali metal oxides R 2 O (R is Li, Na,
K, Cs, Rb) are necessary components to increase the coefficient of expansion of glass, but if their amounts are too large, the chemical durability will drop sharply, so R 2 O is required in the total amount.
It is necessary to keep it within the range of 18 to 25%. However, when using Na 2 O as R 2 O, the weather resistance decreases as the content increases, so it is desirable to keep it at 15% or less.
本発明に係るガラスは線膨張係数が125〜150×
10-7であり、一方磁気ヘツドであるセンダストSi
−Al−Fe合金の膨張係数は約130×10-7であるか
ら、本発明に係るガラスをセンダストの両面に接
合してもガラスが破損することがない。
The glass according to the present invention has a linear expansion coefficient of 125 to 150×
10 -7 , while the magnetic head Sendust Si
Since the -Al-Fe alloy has an expansion coefficient of about 130 x 10 -7 , the glass according to the present invention will not be damaged even if it is bonded to both sides of sendust.
また、PbOを含むガラスは加熱接合時にPbO成
分が還元されてガラス表面にPbが析出し、ヘツ
ド材合金と反応したり、あるいはガラス製造工程
において鉛毒に対する公害対策、衛生対策を講じ
る必要があるが、本発明のガラスではPbOを含有
しないため上記のような問題がない。 In addition, when glass containing PbO is used, the PbO component is reduced during heat bonding and Pb precipitates on the glass surface, reacting with the head material alloy, or it is necessary to take pollution and hygiene measures against lead poisoning during the glass manufacturing process. However, since the glass of the present invention does not contain PbO, it does not have the above problem.
また本発明に係るガラスの転移点は460〜500℃
であり、作業性にも優れている。 Furthermore, the transition point of the glass according to the present invention is 460 to 500°C.
It also has excellent workability.
〔実施例〕
SiO2：60.0％，B2O3：5.0％，ZnO：10.0％，
K2O：10.0％，Na2O：14.0％，ZnO2：1.0％の組
成となるガラス原料を調合したバツチを小型溶解
炉で白金ルツボを用いて約1300℃で５時間加熱溶
解した。[Example] SiO 2 : 60.0%, B 2 O 3 : 5.0%, ZnO: 10.0%,
A batch of glass raw materials having a composition of 10.0% K 2 O, 14.0% Na 2 O, and 1.0% ZnO 2 was melted by heating at approximately 1300° C. for 5 hours in a small melting furnace using a platinum crucible.
溶解したガラスを成形した後徐冷してガラス試
料片を作製した。得られたガラスについて物性を
測定したところ、線膨張係数αが142×10-7、ガ
ラス転移点が約475℃であつた。 A glass sample piece was prepared by molding the molten glass and then slowly cooling it. When the physical properties of the obtained glass were measured, the linear expansion coefficient α was 142×10 -7 and the glass transition point was about 475°C.
上記の膨張係数は磁気ヘツドのセンダストとの
接合に適した値であり、また上記試料ガラスの耐
久性（耐水性、耐酸性）を測定したところ、いず
れも日本光学硝子協会規格の３級を満足するもの
であり、耐久性の点でも実用上問題のないことが
確認できた。 The above expansion coefficient is a value suitable for bonding with the Sendust of the magnetic head, and when the durability (water resistance, acid resistance) of the above sample glass was measured, both satisfied grade 3 of the Japan Optical Glass Association standards. It was confirmed that there were no practical problems in terms of durability.
以上、本発明を磁気ヘツドを例にとり説明した
が、本発明に係るガラスは一般に高い膨張係数の
ガラスが要求されている金属材との接合等におい
て広く適用することができる。 Although the present invention has been described above using a magnetic head as an example, the glass according to the present invention can be widely applied to bonding with metal materials, etc., which generally requires glass with a high coefficient of expansion.
第１図は本発明ガラスの適用例として磁気ヘツ
ドを示す斜視図である。
１……センダスト層、２……ガラス、３……磁
気ヘツド。
FIG. 1 is a perspective view showing a magnetic head as an example of application of the glass of the present invention. 1... Sendust layer, 2... Glass, 3... Magnetic head.
Claims (1)
ル％）、B2O30〜６％，ZnO8〜15％、アルカリ金
属酸化物18〜25％を含有し、線膨張係数が125×
10-7以上であることを特徴とする高膨張ガラス組
成物。1 Contains 50 to 70 mol% of SiO 2 (hereinafter referred to as mol %), 0 to 6% of B 2 O 3 , 8 to 15% of ZnO, and 18 to 25% of alkali metal oxide as main components, and has a linear expansion coefficient of 125×
A high expansion glass composition characterized by having a coefficient of expansion of 10 -7 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2610085A JPS61186246A (en) | 1985-02-13 | 1985-02-13 | Glass composition having high expansion coefficient |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2610085A JPS61186246A (en) | 1985-02-13 | 1985-02-13 | Glass composition having high expansion coefficient |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61186246A JPS61186246A (en) | 1986-08-19 |
| JPH0428654B2 true JPH0428654B2 (en) | 1992-05-14 |
Family
ID=12184172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2610085A Granted JPS61186246A (en) | 1985-02-13 | 1985-02-13 | Glass composition having high expansion coefficient |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61186246A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108793756B (en) * | 2018-06-22 | 2021-12-03 | 贵州佰博新材料科技有限公司 | Glass powder for insulating and coating iron-silicon-aluminum magnetic powder core and preparation method thereof |
-
1985
- 1985-02-13 JP JP2610085A patent/JPS61186246A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61186246A (en) | 1986-08-19 |
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