JPH0531281B2 - - Google Patents

Info

Publication number
JPH0531281B2
JPH0531281B2 JP58080763A JP8076383A JPH0531281B2 JP H0531281 B2 JPH0531281 B2 JP H0531281B2 JP 58080763 A JP58080763 A JP 58080763A JP 8076383 A JP8076383 A JP 8076383A JP H0531281 B2 JPH0531281 B2 JP H0531281B2
Authority
JP
Japan
Prior art keywords
powder
magnetic
magnetic recording
raw material
saturation magnetization
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 - Lifetime
Application number
JP58080763A
Other languages
Japanese (ja)
Other versions
JPS59207605A (en
Inventor
Tadakuni Sato
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.)
Tokin Corp
Original Assignee
Tokin Corp
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 Tokin Corp filed Critical Tokin Corp
Priority to JP58080763A priority Critical patent/JPS59207605A/en
Publication of JPS59207605A publication Critical patent/JPS59207605A/en
Publication of JPH0531281B2 publication Critical patent/JPH0531281B2/ja
Granted legal-status Critical Current

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

  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Hard Magnetic Materials (AREA)
  • Compounds Of Iron (AREA)

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する磁
性粉末に関するものであり、得に垂直磁気記録用
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 particularly to a method for producing powder suitable for perpendicular magnetic recording tapes.

垂直記録媒体としては、磁気テープのベースフ
イ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
化を要すること、つまり、高飽和磁化を有する磁
性体である必要がある。 A perpendicular recording medium must have an axis of easy magnetization perpendicular to the base film of the magnetic tape. To improve the recording density, small uniform particles are required, and to achieve high sensitivity, a magnetic material must have high residual magnetization, that is, it must have a high saturation magnetization.

これらを満たす記録媒体として、スパツタ法に
よるコバルト−クロム系薄膜が良く知られてい
る。 As a recording medium that satisfies these requirements, a cobalt-chromium thin film produced by a sputtering method is well known.

しかしながら、この方法は、特殊な装置が必要
であり、また、高価な原料を有するという工業上
の欠点を有している。 However, this method has the industrial disadvantage of requiring special equipment and having expensive raw materials.

一方、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エライト
粒子粉末を用いた磁気記録媒体が提案されてい
る。 On the other hand, a magnetic recording medium using magnetoplumbite type ferrite particle powder having a uniaxial easy magnetization direction in a direction perpendicular to the hexagonal plate shape has been proposed.

このフエライト粒子粉末を用いた磁気記録媒体
は、金属記録媒体に比べ、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変化の心配も
ないこと、原料が安価であること等の長所を有し
ている。 Magnetic recording media using this ferrite particle powder have the disadvantage of lower saturation magnetization than metal recording media, but they are easy to manufacture and do not have to worry about changes due to oxidation in the atmosphere. It has advantages such as low cost raw materials.

そこで、本発明は、原料粉末をマグネトプラム
バイト型フエライトを焼成して磁気記録用磁性粉
末を製造する方法であり、特にその焼成条件を提
供することを目的とする。 Therefore, the present invention is a method for producing magnetic powder for magnetic recording by firing raw material powder into magnetoplumbite-type ferrite, and particularly aims to provide the firing conditions.

一般にフエライトの生成は、高温側になるほ
ど、生成反応が進むが、焼成体の粒子径も粗大化
し、磁気記録媒体としては、好ましくない。そこ
で、本発明では、酸化物又は焼成して酸化物とな
るBa、Fe、Zn、Nbの夫々の化合物を原料粉末
としたマグネトプラムバイト型フエライト粉末を
製造する方法において、原料粉末を500Kg／cm2以
上の高圧雰囲気中、700℃以上の温度で焼成する
ことを特徴とする磁気記録用磁性粉末の製造方法
である。 Generally, the production reaction of ferrite progresses as the temperature increases, but the particle size of the fired body also becomes coarser, which is not preferable as a magnetic recording medium. Therefore, in the present invention, in a method for manufacturing a magnetoplumbite type ferrite powder using an oxide or a compound of Ba, Fe, Zn, or Nb that becomes an oxide by firing as a raw material powder, the raw material powder is 500 kg/cm This is a method for producing magnetic powder for magnetic recording, which is characterized by firing at a temperature of 700° C. or higher in a high-pressure atmosphere of 2 or higher.

即ち、本発明は、反応温度の上昇に伴う結晶粒
子の生長を回避する方法として、高圧雰囲気中で
原料粉を焼成するものである。これによつて、微
細な粒子径の揃つたフエライト粉末が製造でき
る。 That is, the present invention involves firing raw material powder in a high-pressure atmosphere as a method for avoiding the growth of crystal grains due to an increase in reaction temperature. In this way, ferrite powder with fine particle diameters can be produced.

ここで、本発明において、雰囲気の圧力を500
Kg／cm2以上としたのは、これ以下では、顕著な反
応温度の低下をもたらさないためであり、焼成温
度を700℃以上としたのは、これ以下では、α−
Fe2O3等を異相が検出されたためである。また、
アルゴン高圧雰囲気中で焼成した後、大気中で熱
処理を行つているが、高圧の酸化雰囲気中で焼成
してもよい。 Here, in the present invention, the pressure of the atmosphere is set to 500
The reason why the temperature was set at Kg/cm 2 or more is that below this, the reaction temperature does not drop significantly, and the reason why the firing temperature was set at 700℃ or above is that below this, α-
This is because a different phase such as Fe 2 O 3 was detected. Also,
After firing in an argon high-pressure atmosphere, heat treatment is performed in the air, but the firing may also be performed in a high-pressure oxidizing atmosphere.

磁気記録媒体としては、高飽和磁化と高保磁力
であることが望ましいが、現状では、磁気ヘツド
の能力により適度な保磁力（500〜2000Oe程度）
が要求されている。しかし、将来、磁気ヘツドの
能力向上に伴い高保磁力側に移行することは容易
に想像できる。 It is desirable for magnetic recording media to have high saturation magnetization and high coercive force, but at present, a moderate coercive force (approximately 500 to 2000 Oe) is required depending on the capabilities of the magnetic head.
is required. However, it is easy to imagine that in the future, as the capabilities of magnetic heads improve, there will be a shift to higher coercivity.

したがつて、以下に述べる本発明の実施例にお
いて、バリウムフエライト（BaFe2O19）のFeの
一部を亜鉛（Zn）及びニオブ（Nb）で置換し、
高飽和磁化化と低保磁力化を同時に達成できる
BaFe12-x（Zn2x／３・Nbｘ／３）O19について示す。こ の磁性体は、ｘ＝０で、飽和磁化σ≒52emu／
gr、保磁力IHc≒3000Oeに対し、ｘ＝１では飽和
磁化σ≒57emu／gr、保磁力IHc≒1000Oeとなる
が、ｘ＝1.5近辺で飽和磁化σはｘ＝０とほぼ同
じ値となり、以後は飽和磁化σはｘの増加ととも
に減少する。一方、保磁力IHcはｘの増加ととも
に減少する傾向を示す。 Therefore, in the embodiments of the present invention described below, part of the Fe in barium ferrite (BaFe 2 O 19 ) is replaced with zinc (Zn) and niobium (Nb),
Can achieve high saturation magnetization and low coercive force at the same time
Shown is BaFe 12-x (Zn2x/3・Nbx/3)O 19 . This magnetic material has a saturation magnetization σ≒52emu/
gr, coercive force I H c ≒3000 Oe, when x = 1, saturation magnetization σ≒57emu/gr, coercive force I H c ≒1000 Oe, but near x = 1.5, saturation magnetization σ is almost the same as x = 0 After that, the saturation magnetization σ decreases as x increases. On the other hand, the coercive force I H c tends to decrease as x increases.

尚、本発明において原料粉末とはBa、Fe、
Zn、Nbの酸化物、又は焼成によりこれらの酸化
物を生成する化合物で、具体的には、Ba、Fe、
Zn、Nbの水酸化物、炭酸塩、酸化物等を言う。 In addition, in the present invention, the raw material powders include Ba, Fe,
Zn, Nb oxides, or compounds that produce these oxides by firing, specifically Ba, Fe,
Refers to hydroxides, carbonates, oxides, etc. of Zn and Nb.

実施例 BaFe11（Zn２／３・Nb１／３）O19の組成となるよう に、BaCO3、FeOOH.ZnO、Nb2O5をボールミル
にてアルコールを分散媒として混合した。この混
合粉末を乾燥した後、1000Kg／cm2のアルゴン雰囲
気中、800℃で２時間焼成した。この粉末を大気
中にて750℃で４時間熱処理をした。この粉末の
磁気特性を測定したところ、飽和磁化σが
57emu／gr、保磁力IHcが900Oeであつた。この
粉末を熱塩酸で酸洗した後、水洗し、乾燥した。
この粉末の形状を電子顕微鏡で観察したところ、
0.5μｍ程度の粒径が揃つた六角板状の粒子が見ら
れ、磁気記録媒体として良好なバリウムフエライ
ト粉末が得られた。Example BaCO 3 , FeOOH.ZnO, and Nb 2 O 5 were mixed in a ball mill using alcohol as a dispersion medium so as to have a composition of BaFe 11 (Zn2/3·Nb1/3)O 19 . After drying this mixed powder, it was calcined at 800° C. for 2 hours in an argon atmosphere of 1000 Kg/cm 2 . This powder was heat treated at 750°C for 4 hours in the air. When we measured the magnetic properties of this powder, we found that the saturation magnetization σ was
It had a coercivity of 57 emu/gr and a coercive force I H c of 900 Oe. This powder was pickled with hot hydrochloric acid, washed with water, and dried.
When we observed the shape of this powder using an electron microscope, we found that
Hexagonal plate-shaped particles with a uniform particle size of about 0.5 μm were observed, and a barium ferrite powder suitable for use as a magnetic recording medium was obtained.

同一組成の原料混合物を大気中にて焼成して同
様な生成度合のバリウムフエライトを得るには、
900℃で焼成する必要があり、この焼成粉末を上
記と同様に酸洗浄を行い、粒子形状を観察したと
ころ、1.5μｍ程度の六角板状を有していた。この
粉末を磁気記録媒体として使用することは、実施
例の粉末に比べ、記録密度の点で著しく不利益で
ある。 To obtain barium ferrite with the same degree of production by firing a raw material mixture of the same composition in the atmosphere,
It was necessary to calcinate at 900°C, and the calcined powder was washed with acid in the same manner as above, and when the particle shape was observed, it was found to have a hexagonal plate shape of about 1.5 μm. Using this powder as a magnetic recording medium is significantly disadvantageous in terms of recording density compared to the powder of the example.

比較例 また、比較例のために、BaFe12O19の組成とな
るように、同様の条件で原料粉末を作製し測定し
たところ、飽和磁化σが52emu／gr、保磁力IHc
が3200Oeであつた。この結果から、本発明によ
り明らかに、飽和磁化σの向上と保磁力IHCの低
下が実現できることが判る。Comparative Example In addition, for a comparative example, raw material powder was prepared and measured under similar conditions to have a composition of BaFe 12 O 19 , and the saturation magnetization σ was 52 emu/gr and the coercive force I H c
was 3200Oe. This result clearly shows that the present invention can improve the saturation magnetization σ and reduce the coercive force I H C.

さらに、本発明により磁気記録媒体としてのバ
リウムフエライト粉末の適性化が著しく進行して
いることが判明した。 Furthermore, it has been found that the present invention has significantly improved the suitability of barium ferrite powder as a magnetic recording medium.

以上、説明したように、本発明によれば、微細
で高飽和磁化、低保磁力を有し、磁気記録媒体に
用いるには好適なマグネトプラムバイト型フエラ
イト粉末を製造することができる。 As described above, according to the present invention, it is possible to produce a magnetoplumbite-type ferrite powder that is fine, has high saturation magnetization, low coercive force, and is suitable for use in magnetic recording media.

更に、本発明によれば、組成調整が各成分Ba、
Fe、Zn、及びNbの酸化物又は酸化物となる化合
物のモル数をとることによつて、原料粉末の秤量
のみで決定させるため、安定した品質の得られる
磁気記録用磁性粉末を提供することができる。 Furthermore, according to the present invention, the composition adjustment is performed by adjusting the composition of each component Ba,
To provide a magnetic powder for magnetic recording that can obtain stable quality because it is determined only by the weight of raw material powder by taking the number of moles of oxides or compounds that become oxides of Fe, Zn, and Nb. I can do it.

Claims (1)

【特許請求の範囲】 １ 酸化物であるか又は焼成して酸化物となる
Ba、Fe、Zn、及びNbの夫々の化合物を原料粉
末としたマグネトプラムバイト型フエライト粉末
を製造する方法において、 前記原料粉末を500Kg／cm2以上の高圧雰囲気中
で700℃以上の温度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。[Claims] 1. Is an oxide or becomes an oxide when fired
A method for producing magnetoplumbite-type ferrite powder using raw material powders of respective compounds of Ba, Fe, Zn, and Nb, including firing the raw material powders at a temperature of 700°C or higher in a high-pressure atmosphere of 500 kg/cm 2 or higher. A method for producing magnetic powder for magnetic recording, characterized by:
JP58080763A 1983-05-11 1983-05-11 Manufacture of powder for magnetic recording Granted JPS59207605A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58080763A JPS59207605A (en) 1983-05-11 1983-05-11 Manufacture of powder for magnetic recording

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58080763A JPS59207605A (en) 1983-05-11 1983-05-11 Manufacture of powder for magnetic recording

Publications (2)

Publication Number Publication Date
JPS59207605A JPS59207605A (en) 1984-11-24
JPH0531281B2 true JPH0531281B2 (en) 1993-05-12

Family

ID=13727457

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58080763A Granted JPS59207605A (en) 1983-05-11 1983-05-11 Manufacture of powder for magnetic recording

Country Status (1)

Country Link
JP (1) JPS59207605A (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56149328A (en) * 1980-04-21 1981-11-19 Toshiba Corp Manufacture of magnetic oxide material
JPS5842203A (en) * 1981-09-07 1983-03-11 Toshiba Corp Manufacture of magnetic powder for high density magnetic recurding medium
JPS5856302A (en) * 1981-09-30 1983-04-04 Toshiba Corp Manufacture of magnetic powder used for high density magnetic recording

Also Published As

Publication number Publication date
JPS59207605A (en) 1984-11-24

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