JPS59207604A - Manufacture of powder for magnetic recording - Google Patents
Manufacture of powder for magnetic recordingInfo
- Publication number
- JPS59207604A JPS59207604A JP58080761A JP8076183A JPS59207604A JP S59207604 A JPS59207604 A JP S59207604A JP 58080761 A JP58080761 A JP 58080761A JP 8076183 A JP8076183 A JP 8076183A JP S59207604 A JPS59207604 A JP S59207604A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- solution
- magnetic recording
- li2co3
- na2co3
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
- G11B5/70626—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances
- G11B5/70642—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides
- G11B5/70678—Ferrites
Landscapes
- Magnetic Record Carriers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
- Hard Magnetic Materials (AREA)
- Compounds Of Iron (AREA)
- Paints Or Removers (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、主に磁気記録用テープに使用させる磁性粉末
に関するものであり、特に、垂直磁気記録用テープに適
する粉末の製造方法にかかわるものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates primarily to magnetic powder used in magnetic recording tapes, and in particular to a method for producing powder suitable for perpendicular magnetic recording tapes.
垂直磁気記録媒体としては、磁気テープのベースフィル
ムに垂直な方向に磁化容易軸を有する必要がある。記録
密度を向上するには、小さい均一な粒子が必要であり、
高感度とするには高い残留磁化を有する磁性体である必
要がある。A perpendicular magnetic recording medium must have an axis of easy magnetization in a direction perpendicular to the base film of the magnetic tape. Small, uniform particles are needed to improve recording density;
In order to achieve high sensitivity, it is necessary to use a magnetic material with high residual magnetization.
これらを満たす記録媒体として、スパッタ法によるコバ
ルト−クロム系薄膜がよく知られている。しかしながら
、この方法は、特殊な装置が必要であり、′ｉ！た高価
な原料を使用するという工業上の欠点を有している。A cobalt-chromium thin film produced by sputtering is well known as a recording medium that satisfies these requirements. However, this method requires special equipment and 'i! It has the industrial disadvantage of using expensive raw materials.
本発明は、六角板状に直交する方向に一軸磁化容易方向
を有するマグネトプラムバイト型フェライト粒子粉末を
用いた磁気記録媒体を提供しようとするものである。The present invention aims to provide a magnetic recording medium using magnetoplumbite type ferrite particle powder having a uniaxial easy magnetization direction in a direction perpendicular to a hexagonal plate shape.
金属記録媒体に比べ、酸化物は飽和磁化が小さいという
短所を有しているが、製造方法が簡便であること、及び
大気中における酸化による酸化の心配もないこと、原料
が安価であること等の長所を有している。Compared to metal recording media, oxides have the disadvantage of low saturation magnetization, but they are easy to manufacture, there is no risk of oxidation due to atmospheric oxidation, and the raw materials are cheap. It has the advantages of
本発明は、共沈法により得た粉末にＬｉ、Ｃ０３とＮａ
２ｃｏ３に添加することにより、保磁力の低下と微細な
粒子径の揃った磁気記録用磁性粉末を製造するものであ
る。ここで焼成温度ラフ５０℃以上としたのは、それ以
下ではマグネトプラムバイト構造の生成割合が低く、飽
和磁化が小さくなるためである。なお、 Ｌｉ２ＣＯ３
とＮａ２ＣＯ３の複合添加の効果はこれらがフランクス
としてはたらき９Ｍ相生成反応の促進及び、六角板状結
晶粒生成において１粒度の均一化をもたらす。In the present invention, Li, C03 and Na are added to the powder obtained by the coprecipitation method.
By adding it to 2co3, magnetic powder for magnetic recording with reduced coercive force and uniform fine particle size can be produced. The reason why the firing temperature is set to be 50° C. or higher is that below this temperature, the rate of formation of the magnetoplumbite structure is low and the saturation magnetization is small. In addition, Li2CO3
The effect of the combined addition of Na2CO3 and Na2CO3 is that they act as flanks, promoting the 9M phase formation reaction and making the grain size uniform in the formation of hexagonal plate-like crystal grains.
以下９本発明の実施例について説明する。Nine embodiments of the present invention will be described below.
実施例
Ｂａ０・５Ｆｅ２０ｇになるように、塩化バリウムと塩
化第２鉄の水溶液を、水酸化ナトリウム水溶液中に滴下
し、共沈物を得た。この沈澱を水洗した後、 Ｌｉ２
ＣＯ３とＮａ ２ ＣＯｓ ｋ ４対乙の割合で。Example Ba0.5Fe20g of an aqueous solution of barium chloride and ferric chloride was dropped into an aqueous sodium hydroxide solution to obtain a coprecipitate. After washing this precipitate with water, Li2
CO3 and Na2COs k in the ratio of 4 to O.
沈澱に対し０〜５ｗｔ％’に水溶液の状態で混合した後
、乾燥した。The mixture was mixed in the form of an aqueous solution to 0 to 5 wt% of the precipitate, and then dried.
この粉末を空気中にて、９００℃で３時間焼成した。こ
の焼成物をアルコールを分散媒として。This powder was calcined in air at 900°C for 3 hours. This fired product was mixed with alcohol as a dispersion medium.
ボールミルにて解砕した。乾燥後、この粉末を電子顕微
鏡にて観察したところ、約０．２μｍの粒子径が非常に
揃った粉末であった。この粉末の磁気特性の結果を図に
示す。It was crushed in a ball mill. After drying, this powder was observed under an electron microscope and found to be a powder with a very uniform particle size of approximately 0.2 μm. The results of the magnetic properties of this powder are shown in the figure.
Ｌ１２ＣＯ３とＮａ２ＣＯ３の複合添加によって、Ｈｅ
が著しく減少し、σ は４ｗｔ％を越えると急激に低下
する傾向が見られた。このｌＨｃの低下については、添
加物中のＬｌ がバリウムフェライトに固溶し、ｌＨ
ｃの低下をもたらすと思われる。By the combined addition of L12CO3 and Na2CO3, He was significantly reduced, and σ tended to decrease rapidly when it exceeded 4 wt%. Regarding this decrease in lHc, Ll in the additive dissolves in barium ferrite, and lHc
This is thought to result in a decrease in c.
本実施例で、焼成物をボールミルにて解砕しているが、
これは酸洗等によっても可能である。In this example, the fired product is crushed in a ball mill, but
This can also be done by pickling or the like.
またＬｉ２ＣＯ３とＮａ２ＣＯ３として表示しであるが
。They are also expressed as Li2CO3 and Na2CO3.
焼成Ｋ ヨｌ） Ｌｌ及びＮａの酸化物となるもの＋あ
れば１本発明の範囲に含まれるものである。(Calcination) If there is one that becomes an oxide of Ll and Na, it is included in the scope of the present invention.
また本実施例では、バリウムフェライトについてのみ述
べたが、ストロンチウムフェライト。Furthermore, in this example, only barium ferrite was described, but strontium ferrite is used.
鉛フェライトについても同様に適用される。The same applies to lead ferrite.
磁気ヘッドの性能上、磁気記録媒体には高過ぎない保磁
力が要求されている。本発明は保磁力の減少と同時に、
焼成粉末の解砕も容易となるため１粒度の異なる粉末の
混在も避けることができ、高密度磁気記録用粉末の製造
方法とし３−
て非常に有益である。In view of the performance of the magnetic head, the magnetic recording medium is required to have a coercive force that is not too high. The present invention simultaneously reduces the coercive force.
Since the fired powder can be easily crushed, mixing of powders with different particle sizes can be avoided, and this is very useful as a method for producing powder for high-density magnetic recording.
エライト解砕粉末の飽和磁化σ８（ｅｍｕ／ｇｒ ）と
保４−Saturation magnetization σ8 (emu/gr) and retention of elite crushed powder
Claims (1)
造において、塩化バリウム（ストロンチウム、鉛）及び
塩化鉄の水溶液全アルカリ水溶液中にて共沈させた後、
共沈物にＬｉ２ＣＯ３とＮａ２ ”０３ｔ ４ ｗｔ％
以下複合添加し、７５０℃以上の酸化雰囲気中で焼成す
ることを特徴とする磁気記録用磁性粉末の製造方法。1. In the production of powder having a magnetoplumbite crystal structure, after co-precipitating an aqueous solution of barium chloride (strontium, lead) and iron chloride in a total alkaline aqueous solution,
Li2CO3 and Na2 ”03t 4 wt% in coprecipitate
A method for producing magnetic powder for magnetic recording, which comprises adding the following in combination and firing in an oxidizing atmosphere at 750° C. or higher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58080761A JPS59207604A (en) | 1983-05-11 | 1983-05-11 | Manufacture of powder for magnetic recording |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58080761A JPS59207604A (en) | 1983-05-11 | 1983-05-11 | Manufacture of powder for magnetic recording |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59207604A true JPS59207604A (en) | 1984-11-24 |
| JPH0534813B2 JPH0534813B2 (en) | 1993-05-25 |
Family
ID=13727396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58080761A Granted JPS59207604A (en) | 1983-05-11 | 1983-05-11 | Manufacture of powder for magnetic recording |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59207604A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57120308A (en) * | 1981-01-17 | 1982-07-27 | Toda Kogyo Corp | Manufacture of vertical magnetic recording hexagonal planar magnet plumbite type ferrite particle powder |
| JPS5841728A (en) * | 1981-08-19 | 1983-03-11 | バスフ・アクチエンゲゼルシヤフト | Manufacture of fine ferrite powder |
-
1983
- 1983-05-11 JP JP58080761A patent/JPS59207604A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57120308A (en) * | 1981-01-17 | 1982-07-27 | Toda Kogyo Corp | Manufacture of vertical magnetic recording hexagonal planar magnet plumbite type ferrite particle powder |
| JPS5841728A (en) * | 1981-08-19 | 1983-03-11 | バスフ・アクチエンゲゼルシヤフト | Manufacture of fine ferrite powder |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0534813B2 (en) | 1993-05-25 |
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