JPS631642B2 - - Google Patents
Info
- Publication number
- JPS631642B2 JPS631642B2 JP53148424A JP14842478A JPS631642B2 JP S631642 B2 JPS631642 B2 JP S631642B2 JP 53148424 A JP53148424 A JP 53148424A JP 14842478 A JP14842478 A JP 14842478A JP S631642 B2 JPS631642 B2 JP S631642B2
- Authority
- JP
- Japan
- Prior art keywords
- core
- oxide film
- permalloy
- microns
- magnetic head
- 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
- 239000011651 chromium Substances 0.000 claims description 39
- 229910000889 permalloy Inorganic materials 0.000 claims description 18
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 239000011162 core material Substances 0.000 description 36
- 229910000702 sendust Inorganic materials 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 239000003822 epoxy resin Substances 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 229920000647 polyepoxide Polymers 0.000 description 4
- 229910001035 Soft ferrite Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001844 chromium Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052595 hematite Inorganic materials 0.000 description 1
- 239000011019 hematite Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 238000001259 photo etching Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
Landscapes
- Magnetic Heads (AREA)
Description
【発明の詳細な説明】
この発明は、表面に耐摩耗性のすぐれた酸化皮
膜を形成したクローム系パーマロイ薄板を積層し
てなる磁気ヘツドコアに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head core made of laminated chromium-based permalloy thin plates each having an oxide film with excellent wear resistance formed on its surface.
磁気ヘツドコア用材料に要求される特性は、磁
気テープの摺動に対する耐摩耗性がよく、磁気ヘ
ツドの電磁変換特性に関係した飽和磁束密度と透
磁率が高く、かつ保磁力が低いこと、さらにコア
片への加工が容易であることなどである。 The properties required of magnetic head core materials include good abrasion resistance against magnetic tape sliding, high saturation magnetic flux density and magnetic permeability related to the electromagnetic conversion characteristics of magnetic heads, and low coercive force. It is easy to process into pieces.
これらの要求を満たす磁気ヘツド用材料として
は、一般にパーマロイ、ソフトフエライト、セン
ダスト等が用いられている。しかし、ソフトフエ
ライトは飽和磁束密度が低く欠け等の問題もあ
り、又センダストは加工性が悪く量産性が低いと
いう欠点があり、飽和磁束密度・透磁率が高く、
かつ加工性が良い等のことからパーマロイが多く
用いられている。 Permalloy, soft ferrite, sendust, etc. are generally used as magnetic head materials that meet these requirements. However, soft ferrite has low saturation magnetic flux density and problems such as chipping, and sendust has the disadvantage of poor workability and low mass production.
Permalloy is often used because of its good processability.
しかし、パーマロイはソフトフエライト・セン
ダストと比較して耐摩耗性が低いという欠点があ
り、耐摩耗性の向上が強く望まれていた。そし
て、前記パーマロイの耐摩耗性を向上させる方法
として、Si、Ti、Alなどの元素を添加して硬度
を高める手段が講じられているが、期待するほど
には耐摩耗性が向上しないばかりか、パーマロイ
の特徴である高飽和磁束密度は前記元素の添加に
より著しく低下する欠点があつた。 However, permalloy has the disadvantage of lower abrasion resistance than soft ferrite/sendust, and there has been a strong desire for improved abrasion resistance. As a method to improve the wear resistance of permalloy, measures have been taken to increase the hardness by adding elements such as Si, Ti, and Al, but the wear resistance does not improve as much as expected. However, the high saturation magnetic flux density, which is a characteristic of permalloy, has the drawback of being significantly reduced by the addition of the above elements.
又、パーマロイとして、体積抵抗率の増加、渦
電流損失の減少、透磁率の向上及び熱処理の容易
化等の為、Cr、Mo、Cu等を添加することが知ら
れている。 Furthermore, it is known that Cr, Mo, Cu, etc. are added to permalloy in order to increase volume resistivity, reduce eddy current loss, improve magnetic permeability, and facilitate heat treatment.
本発明者は、パーマロイの持つている長所を生
かし、かつ耐摩耗性のすぐれた磁気ヘツドコアの
提供を目的とし、種々実験を繰返した結果、クロ
ーム系パーマロイの表面に熱処理によりクローム
系の酸化皮膜を形成させることで、飽和磁束密度
を低下させることなく、透磁率を向上させ、しか
も密着強度の強い酸化皮膜を有するコア片を工業
的に量産性高く提供可能であることを知見した。 The inventor of the present invention has made use of the advantages of permalloy to provide a magnetic head core with excellent wear resistance, and as a result of repeated various experiments, the inventor has developed a chromium-based oxide film by heat treatment on the surface of chromium-based permalloy. It has been found that by forming such a core piece, it is possible to provide a core piece having an oxide film with improved magnetic permeability and strong adhesion strength without reducing the saturation magnetic flux density, and with high productivity in an industrial manner.
すなわち、この発明は、磁気ヘツド用材料とし
て、クローム系パーマロイを用いることにより達
成されるもので、熱処理により表面に厚さ0.5μｍ
以上のCr2O3又はMO・Cr2O3からなる酸化皮膜
を形成したクローム系パーマロイのコア片の複数
枚をエポキシ樹脂等の接着剤を使つて接着積層し
てなる磁気ヘツドコアであり、耐摩耗性にすぐれ
たことを特徴とする。なお、上記ＭはMg、Co、
Fe、Ni、Mnを表わす。 That is, this invention is achieved by using chromium-based permalloy as a material for the magnetic head, and the surface is heated to a thickness of 0.5 μm.
This is a magnetic head core made by laminating multiple chromium-based permalloy core pieces on which an oxide film of Cr 2 O 3 or MO/Cr 2 O 3 has been formed using an adhesive such as epoxy resin. It is characterized by excellent abrasion resistance. In addition, the above M is Mg, Co,
Represents Fe, Ni, and Mn.
この発明において、クローム系パーマロイ表面
にCr酸化皮膜を形成するには、コア片を磁気焼
なましした後、さらに露点０〜＋40℃の湿潤ガス
中、700℃以上で熱処理を行い、表面に0.5ミクロ
ン以上の厚さのCr酸化皮膜を形成する。なお、
この際Cr酸化皮膜は、Cr酸化物のほかに、Mg、
Co、Fe、Ni、Mnの１種又は２種以上の酸化物
が混在したものでもよい。 In this invention, in order to form a Cr oxide film on the chromium-based permalloy surface, the core piece is magnetically annealed and then heat treated at 700°C or higher in a humid gas with a dew point of 0 to +40°C to form a Cr oxide film on the surface of 0.5°C. Forms a Cr oxide film with a thickness of microns or more. In addition,
At this time, in addition to Cr oxide, the Cr oxide film contains Mg,
One or more oxides of Co, Fe, Ni, and Mn may be mixed together.
そして、Cr酸化皮膜を0.5ミクロン厚さ以上と
したのは、それ未満ではすぐれた耐摩耗性が得ら
れないからである。すなわち、Cr酸化皮膜はモ
ース硬度8.5で非常に硬いため、磁気テープの摺
動による摩耗を阻止してコア全体を守る働きをし
耐摩耗性を向上させるのである。又Cr酸化皮膜
は良絶縁体であるから積層されたコアは層間絶縁
が完全で渦電流損失を低減できる。 The reason why the Cr oxide film is set to a thickness of 0.5 microns or more is because excellent wear resistance cannot be obtained if the thickness is less than 0.5 microns. In other words, since the Cr oxide film is extremely hard with a Mohs hardness of 8.5, it prevents wear caused by sliding of the magnetic tape, protects the entire core, and improves wear resistance. Furthermore, since the Cr oxide film is a good insulator, the laminated core has perfect interlayer insulation and can reduce eddy current loss.
実施例 １
重量比で６％Cr、42％Ni、残部実質的にFeよ
りなるCr系パーマロイを、溶解→鋳造→熱間加
工→冷間加工の通常の工程で0.1mmの厚さに圧延
後、打抜き（またはフオトエツチング）によつて
コア片に加工し、露点が−70℃の乾燥水素中で
1100℃、３時間の磁気焼なましを行い、続いて露
点が＋30℃の湿潤水素中で800℃、１時間の熱処
理を行つて、表面にCr酸化皮膜を形成せしめた。
そして、上記コア片の６枚をエポキシ樹脂を使つ
て接着積層し磁気ヘツドコアを作つた。第１図は
上記により得たコア片断面をＸ線マイクロアナラ
イザーで観察した結果を示すもので、同図ａは
Crと酸素の濃度分布を示し、同図ｂは組成像に
よる表面酸化物を示す。すなわち、組成像で斜線
の部分が酸化物に対応しており、その部分でCr
と酸素の濃度が高くなつているので、コア片表面
にCr酸化物が形成されていることがわかる。こ
のCr酸化皮膜の厚さは1.2ミクロンであつた。Example 1 A Cr-based permalloy consisting of 6% Cr, 42% Ni, and the balance substantially Fe was rolled to a thickness of 0.1 mm through the usual process of melting → casting → hot working → cold working. , processed into core pieces by punching (or photoetching), and heated in dry hydrogen with a dew point of -70°C.
Magnetic annealing was performed at 1100°C for 3 hours, followed by heat treatment at 800°C for 1 hour in wet hydrogen with a dew point of +30°C to form a Cr oxide film on the surface.
Then, six of the above core pieces were adhesively laminated using epoxy resin to produce a magnetic head core. Figure 1 shows the results of observing the cross section of the core obtained above using an X-ray microanalyzer;
The concentration distribution of Cr and oxygen is shown, and part b of the same figure shows the surface oxide based on the composition image. In other words, the shaded area in the composition image corresponds to the oxide, and Cr
As the oxygen concentration increases, it can be seen that Cr oxide is formed on the surface of the core piece. The thickness of this Cr oxide film was 1.2 microns.
実施例 ２
実施例１と同様のコア片を露点が−70℃の乾燥
水素中で1100℃、３時間の磁気焼なましを行つた
後、露点が＋30℃の湿潤水素中で1000℃、１時間
の熱処理を行つて、表面にCr酸化皮膜を形成せ
しめた。そして、上記コア片の６枚をエポキシ樹
脂を使つて接着積層し磁気ヘツドコアを作つた。
そして上記により得たコア片断面をＸ線マイクロ
アナライザーで観察した結果を第２図に示す。同
図ａは第１図と同様Crと酸素の濃度分布を示し、
同図ｂは組成像による表面酸化物を示す。この実
施例２においても、コア片表面にCr酸化皮膜が
形成された。そのCr酸化皮膜の厚さは3.3ミクロ
ンであつた。Example 2 A core piece similar to Example 1 was magnetically annealed at 1100°C for 3 hours in dry hydrogen with a dew point of -70°C, and then annealed at 1000°C in wet hydrogen with a dew point of +30°C for 1 hour. Heat treatment was performed for several hours to form a Cr oxide film on the surface. Then, six of the above core pieces were adhesively laminated using epoxy resin to produce a magnetic head core.
FIG. 2 shows the results of observing the cross section of the core piece obtained above using an X-ray microanalyzer. Figure a shows the concentration distribution of Cr and oxygen, similar to Figure 1.
Figure b shows a compositional image of surface oxides. In this Example 2 as well, a Cr oxide film was formed on the surface of the core piece. The thickness of the Cr oxide film was 3.3 microns.
実施例 ３
重量比で２％Cr、82％Ni、残部実質的にFeよ
りなるCr系パーマロイを、実施例１と同様な工
程により、表面にCr酸化皮膜を形成してなるコ
ア片を得た。該コア片の６枚をエポキシ樹脂を使
つて接着積層し、磁気ヘツドコアを作製した。上
記Cr酸化皮膜の厚さは0.9ミクロンであつた。Example 3 A core piece was obtained by forming a Cr oxide film on the surface of a Cr-based permalloy consisting of 2% Cr, 82% Ni, and the remainder substantially Fe in the same process as in Example 1. . Six of the core pieces were adhesively laminated using epoxy resin to produce a magnetic head core. The thickness of the Cr oxide film was 0.9 microns.
第３図は前記実施例１および２のコア片をそれ
ぞれ６枚積層して作つたコアを用いて、磁気テー
プの摺動による摩耗量の時間推移を測定した結果
を示す。その際の磁気テープにはγヘマタイトテ
ープを使用し、テープ速度は4.75cm／secであつ
た。また比較のため、市販の高硬度パーマロイお
よびセンダストで作成したコアを同一試験条件で
測定した結果も併せて示した。第３図の結果より
明らかなごとく、磁気テープ走行時間1000時間で
の摩耗量は、市販の高硬度パーマロイコアが40ミ
クロン、同じくセンダストコアが22ミクロンであ
るのに対し、Cr酸化皮膜厚さ1.2ミクロンのコア
（実施例１）では17ミクロン、Cr酸化皮膜厚さ3.3
ミクロンのコア（実施例２）では10ミクロンであ
り、この発明によるコアの摩耗量は、高硬度パー
マロイコアの約1/4〜2/5、センダストコアの約1/
２〜2/3と非常に少ない好結果が得られた。 FIG. 3 shows the results of measuring the time course of the wear amount due to sliding of the magnetic tape using a core made by laminating six core pieces of each of Examples 1 and 2. Gamma hematite tape was used as the magnetic tape at that time, and the tape speed was 4.75 cm/sec. For comparison, the results of measuring cores made of commercially available high-hardness permalloy and Sendust under the same test conditions are also shown. As is clear from the results in Figure 3, the amount of wear after 1000 hours of magnetic tape running time is 40 microns for commercially available high hardness permalloy cores and 22 microns for sendust cores, while the Cr oxide film thickness is 1.2 microns. Micron core (Example 1) is 17 microns, Cr oxide film thickness is 3.3
The wear amount of the micron core (Example 2) is 10 microns, and the wear amount of the core according to the present invention is about 1/4 to 2/5 that of the high hardness permalloy core, and about 1/1 that of the sendust core.
Very few good results were obtained, ranging from 2 to 2/3.
以上説明したごとく、この発明によれば、耐摩
耗性の非常にすぐれた磁気ヘツドコアを提供し得
る上、熱処理工程のみでCr酸化皮膜を形成し得
るので、工業的に安価な磁気ヘツドコアを量産す
ることができる。 As explained above, according to the present invention, it is possible to provide a magnetic head core with extremely excellent wear resistance, and a Cr oxide film can be formed only through a heat treatment process, so that it is possible to mass-produce magnetic head cores that are industrially inexpensive. be able to.
第１図ａはこの発明の実施例１におけるＸ線マ
イクロアナライザーのプロフアイル線で観測した
Crおよび酸素の濃度分布を示す図表、同図ｂは
同じくＸ線マイクロアナライザーの組成像で観察
した表面酸化物を示す説明図、第２図ａは同上実
施例２におけるＸ線マイクロアナライザーのプロ
フアイル線で観測したCrおよび酸素の濃度分布
を示す図表、同図ｂは同じくＸ線マイクロアナラ
イザーの組成像で観察した表面酸化物を示す説明
図、第３図は同上実施例１、２による本発明コア
の磁気テープ走行時間と摩耗量との関係を従来品
と比較して示す図表である。
Figure 1a is the profile line observed with the X-ray microanalyzer in Example 1 of this invention.
A diagram showing the concentration distribution of Cr and oxygen; FIG. A diagram showing the concentration distribution of Cr and oxygen observed by the X-ray, Figure b is an explanatory diagram showing the surface oxides observed by the composition image of the X-ray microanalyzer, and Figure 3 shows the present invention according to Examples 1 and 2 of the same. It is a chart showing the relationship between core magnetic tape running time and wear amount in comparison with conventional products.
Claims (1)
Cr2O3からなる厚さ0.5μｍ以上の酸化皮膜を表面
に有するクローム系パーマロイのコア片を複数枚
積層してなる耐摩耗性のすぐれた磁気ヘツドコ
ア。 ただし、前記ＭはMg、Co、Fe、Ni、Mnを表
わす。[Claims] 1. Cr 2 O 3 or MO. formed by heat treatment.
A magnetic head core with excellent wear resistance made by laminating multiple chromium-based permalloy core pieces that have an oxide film of Cr 2 O 3 with a thickness of 0.5 μm or more on the surface. However, M represents Mg, Co, Fe, Ni, and Mn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14842478A JPS5573917A (en) | 1978-11-29 | 1978-11-29 | Magnetic head core with excellent resistance to wear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14842478A JPS5573917A (en) | 1978-11-29 | 1978-11-29 | Magnetic head core with excellent resistance to wear |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5573917A JPS5573917A (en) | 1980-06-04 |
| JPS631642B2 true JPS631642B2 (en) | 1988-01-13 |
Family
ID=15452477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14842478A Granted JPS5573917A (en) | 1978-11-29 | 1978-11-29 | Magnetic head core with excellent resistance to wear |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5573917A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS578916A (en) * | 1980-06-18 | 1982-01-18 | Furukawa Electric Co Ltd:The | Magnetic head core with wear resistance |
| JPS62149009A (en) * | 1985-12-24 | 1987-07-03 | Canon Electronics Inc | Manufacture of laminated core |
| DE4323115A1 (en) * | 1992-08-03 | 1994-02-10 | Philips Electronics Nv | Magnetic head with a layer essentially containing Cr¶2¶O¶3¶ and method for producing such a magnetic head |
| SG55136A1 (en) | 1992-08-03 | 1999-05-25 | Koninkl Philips Electronics Nv | Magnetic head having a wear-resistant layer and method of manufacturing such a magnetic head |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS533771U (en) * | 1976-06-25 | 1978-01-13 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50109613U (en) * | 1974-02-15 | 1975-09-08 |
-
1978
- 1978-11-29 JP JP14842478A patent/JPS5573917A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS533771U (en) * | 1976-06-25 | 1978-01-13 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5573917A (en) | 1980-06-04 |
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