JPS63193504A - Magnetic powder for high density magnetic recording and magnetic recording medium using the powder - Google Patents
Magnetic powder for high density magnetic recording and magnetic recording medium using the powderInfo
- Publication number
- JPS63193504A JPS63193504A JP62025909A JP2590987A JPS63193504A JP S63193504 A JPS63193504 A JP S63193504A JP 62025909 A JP62025909 A JP 62025909A JP 2590987 A JP2590987 A JP 2590987A JP S63193504 A JPS63193504 A JP S63193504A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic powder
- magnetic
- magnetic recording
- powder
- atoms
- 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
- 239000006247 magnetic powder Substances 0.000 title claims abstract description 40
- 239000000843 powder Substances 0.000 title description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 39
- 229910052751 metal Inorganic materials 0.000 claims abstract description 20
- 239000002184 metal Substances 0.000 claims abstract description 20
- 239000000126 substance Substances 0.000 claims abstract description 15
- 239000002245 particle Substances 0.000 claims abstract description 13
- 229910052715 tantalum Inorganic materials 0.000 claims abstract description 9
- 229910052787 antimony Inorganic materials 0.000 claims abstract description 8
- 239000000470 constituent Substances 0.000 claims abstract description 7
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 7
- 229910052718 tin Inorganic materials 0.000 claims abstract description 4
- 238000006467 substitution reaction Methods 0.000 claims description 10
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 5
- 150000002739 metals Chemical class 0.000 claims description 2
- 230000005415 magnetization Effects 0.000 abstract description 6
- 239000011521 glass Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- -1 polyethylene terephthalate Polymers 0.000 description 3
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 125000001424 substituent group Chemical group 0.000 description 2
- IIZPXYDJLKNOIY-JXPKJXOSSA-N 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphocholine Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@H](COP([O-])(=O)OCC[N+](C)(C)C)OC(=O)CCC\C=C/C\C=C/C\C=C/C\C=C/CCCCC IIZPXYDJLKNOIY-JXPKJXOSSA-N 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000007496 glass forming Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- XMNVMZIXNKZAJB-UHFFFAOYSA-N iron(3+);lead(2+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Fe+3].[Fe+3].[Pb+2].[Pb+2] XMNVMZIXNKZAJB-UHFFFAOYSA-N 0.000 description 1
- 239000000787 lecithin Substances 0.000 description 1
- 229940067606 lecithin Drugs 0.000 description 1
- 235000010445 lecithin Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 210000002374 sebum Anatomy 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
Landscapes
- 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】
（産業上の利用分野）
本発明は、高密度磁気記録用磁性粉およびそれを用いた
磁気記録用媒体に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic powder for high-density magnetic recording and a magnetic recording medium using the same.
（従来の技術）
塗布形の磁気記録用媒体は、ポリエチレンテレフタレー
ト等の非磁性支持体と、この支持体上に設けられた磁性
粉および目脂バインダを主成分とする磁性層とから構成
されている。(Prior Art) A coated magnetic recording medium is composed of a non-magnetic support such as polyethylene terephthalate, and a magnetic layer provided on the support, the main components of which are magnetic powder and a sebum binder. There is.
磁性粉としては、従来よりγ−Ｆｅ２ ０３、Ｃｒ ０
２ 、Ｃｏ−７−Ｆｅ２ ０３等の針状磁性粉が広く用
いられている。五近、磁気記録密度の大幅な向上を図る
ために、垂直磁化記録のできる磁気記録用媒体が強く望
まれており、これに適する磁気記録用媒体として六方晶
系フェライトの超微粒子状磁性粉を用いたものが研究さ
れ、高密度記録が可能であることが見出されている。As magnetic powder, γ-Fe2 03, Cr 0
Acicular magnetic powders such as 2 and Co-7-Fe203 are widely used. In order to significantly improve the magnetic recording density, there is a strong desire for a magnetic recording medium that can perform perpendicular magnetization recording, and ultrafine hexagonal ferrite magnetic powder has been developed as a magnetic recording medium suitable for this purpose. The devices used have been studied and found to be capable of high-density recording.
（発明が解決しようとする問題点）
ところで、上述した六方晶系フェライトを磁性粉として
用いた磁気記録用媒体においても、その磁気特性は温度
変イヒに対して安定であることが必要である。つまり、
磁気特性の温度変化が著しいと、磁気記録用媒体として
の記録再生特性が使用時における周囲温度の変（ヒに伴
って大幅に変動することになり、実用上支障を生ずるか
らである。(Problems to be Solved by the Invention) Incidentally, even in a magnetic recording medium using the above-mentioned hexagonal ferrite as magnetic powder, its magnetic properties must be stable against temperature changes. In other words,
This is because if the magnetic properties change significantly with temperature, the recording and reproducing characteristics of the magnetic recording medium will vary significantly with changes in ambient temperature during use, which will cause problems in practical use.
六方晶系フェライトを用いた磁気記録用媒体は、常温前
後においても、保磁力（ＨＣ）の値が温度上昇と共に増
加するという特徴ある温度特性を示し、温度変化に対し
て比較的安定な媒体である。しかしながら、実用的な見
地からは、この六方晶系フェライトにも、より一層の温
度安定性が望まれていた。Magnetic recording media using hexagonal ferrite exhibit a characteristic temperature characteristic in which the value of coercive force (HC) increases as the temperature rises, even around room temperature, making it a relatively stable medium against temperature changes. be. However, from a practical standpoint, even higher temperature stability has been desired for this hexagonal ferrite.
本発明者等は、このような従来の事情に対処して六方晶
系フェライトの保磁力（ＨＣ）の温度安定性を改良する
方法について種々検討をすずめたところ、Ｆｅ原子の一
部を、２ｒｒＪ金属と、Ｎｂ、 ＳｂおよびＴａがら選
ばれた少なくとも １種の５価金属と、１化学式当たり
０．０５〜０，５個の範囲のＳｎ原子で置換した平均
粒径０．０２〜０．２μＪ、保磁力２００〜２０００
ｏｅの六方晶系フェライト磁性粉が、Ｓｎを含有しない
場合に比べて著しく保磁力の温度依存性が減少し、高密
度記録用材料として好適であることを見出した。The present inventors have conducted various studies on methods for improving the temperature stability of the coercive force (HC) of hexagonal ferrite in response to the conventional circumstances, and found that some of the Fe atoms are metal, at least one pentavalent metal selected from Nb, Sb, and Ta, and an average particle size of 0.02 to 0.2 μJ substituted with Sn atoms in the range of 0.05 to 0.5 per chemical formula. , coercive force 200-2000
It has been found that the hexagonal ferrite magnetic powder of oe has significantly reduced temperature dependence of coercive force compared to a case not containing Sn, and is suitable as a material for high-density recording.
本発明は、かかる知見に基づいてなされたもので、温度
特性が改良された？Ｓ密度磁気記録用磁磁性粉よびそれ
を用いた磁気記録用媒体を提供することを目的とする。The present invention was made based on this knowledge, and has improved temperature characteristics. An object of the present invention is to provide a magnetic powder for S-density magnetic recording and a magnetic recording medium using the same.
仁発明の構成コ
（問題点を解決するための手Ｆ！ｌ）
すなわち、本発明は、平均粒径０．０２〜０．２μｍ、
保磁力２００〜２０００ ｏ、の六方晶系フェライト磁
性粉において、その構成元素であるＦｅ原子の一部が、
２価金纜と、Ｎｂ、ＳｂおよびＴａから選ばれた少なく
とも １種の５価金属と、１イヒ学式当たり ＯＣ５〜
０．５個の範囲のＳｎ原子で置換されていることを特徴
とする高密度磁気記録用磁性粉およびこれを支持体表面
に付着さぜな磁気記録用媒体に関するものである。Constituent of the invention (method for solving the problem F!l) That is, the present invention has an average particle size of 0.02 to 0.2 μm,
In hexagonal ferrite magnetic powder with a coercive force of 200 to 2000 o, some of its constituent Fe atoms are
Divalent gold, at least one pentavalent metal selected from Nb, Sb and Ta, and OC5~ per Ihi chemical formula.
The present invention relates to a magnetic powder for high-density magnetic recording, characterized in that it is substituted with 0.5 Sn atoms, and to a magnetic recording medium in which the same is attached to the surface of a support.
本発明に用いられる六方晶系フェライトとしては、例え
ばＭｍ （Ｍａｇｎｅｔｏｐｌｕｍｂｉｔｅ ｔｉｐｅ
）、Ｗ型の六方晶系の、８ａフェライト、Ｓｒフェライ
ト、鉛フェライト、Ｃａフェライトあるいはこれらの固
溶体もしくはイオン置換体等を挙げることができる。As the hexagonal ferrite used in the present invention, for example, Mm (Magnetoplumbite tip
), W-type hexagonal system, 8a ferrite, Sr ferrite, lead ferrite, Ca ferrite, or solid solutions or ion-substituted products thereof.
本発明に用いられる六方晶系フェライト磁性粉としては
、これらの−軸異方性の六方晶系フェライト結晶の格成
元素であるＦｅ原子の一部を２価金属と、Ｎｔｌ、 Ｓ
ｂおよびＴａがら選ばれた少なくとも１種の５価金属と
、 １化学式当たり ０．０５〜０．５個の範囲のＳｎ
原子で置換した保磁力が２００〜２００００ｅの元素が
用いられる。As the hexagonal ferrite magnetic powder used in the present invention, some of the Fe atoms, which are the lattice elements of these -axis anisotropic hexagonal ferrite crystals, are replaced with a divalent metal, Ntl, S
At least one pentavalent metal selected from b and Ta, and Sn in the range of 0.05 to 0.5 per chemical formula.
An element substituted with atoms and having a coercive force of 200 to 20,000e is used.
上記−軸異方性の六方晶系フェライト結晶の平均粒径を
０．０２〜０．２μｍの範囲に限定したのは、０．０２
μを未満では、磁化および保磁力が減少して磁気記録用
媒体の再生出力が低下し、逆に０．２μｌを越えると、
保磁力が減少しかつ高密度記５．Ｌの際に再生時のノイ
ズが著しくなるためである。The reason why the average grain size of the above-mentioned -axis anisotropic hexagonal ferrite crystals is limited to the range of 0.02 to 0.2 μm is 0.02 μm.
If it is less than 0.2 μl, the magnetization and coercive force will decrease and the reproduction output of the magnetic recording medium will decrease; on the other hand, if it exceeds 0.2 μl,
5. Coercivity decreases and high density. This is because the noise during reproduction becomes significant when the signal is L.
またその保磁力を２００〜２００００ｅの範囲に限定し
たのは、２０Ｏｏｅ未溝では記録媒体におけろ記３．に
信号が充分残存しなくなり、２００００ｅを越えるとヘ
ッドによる信号の古き込みが困難となるためである。Moreover, the reason why the coercive force is limited to the range of 200 to 20,000e is because the recording medium with 200oe grooves is not suitable for recording media. This is because there is no longer enough signal left in the head, and if it exceeds 20,000e, it becomes difficult for the head to age the signal.
本発明における２価金属としては、Ｃｏ、 ｚｎ、 Ｎ
ｉ、Ｍｎ、 Ｃｕ、 Ｈｇ等の比較的フェライト中のＦ
ｅｒｇ：子とよく置換する元素が選ばれる。Divalent metals in the present invention include Co, zn, N
I, Mn, Cu, Hg, etc. are comparatively F in ferrite.
erg: Elements that often substitute with children are selected.
本発明のフェライトにおいては、２価金属（Ｍ ）およ
び５価金属（Ｍｖ）の適正な置換量■
はＭ およびＭ の組合せにより異なるがＭｎの■
ｖ
１化学式当りの置換量は、おおむね０．５〜１．２個で
ある。In the ferrite of the present invention, the appropriate substitution amount of divalent metal (M) and pentavalent metal (Mv) varies depending on the combination of M and M, but Mn's
v The amount of substitution per chemical formula is approximately 0.5 to 1.2.
これらの置換元素の置換量の関係を、例えばマグネトプ
ランバイト型Ｂａフェライトについてみると、その置換
体の化学式は、
８ａＦｅ１２−（ｘ＋ｙ＋２）ＭＩＩｘＭｖｙＳｎ７０
１９で表される。ここでｘ、ｙ、ｚはＭｕ、Ｍｖおよび
Ｓｎ元素のフェライト １化学式当りの置換量である。Looking at the relationship between the amounts of substitution of these substituent elements, for example in magnetoplumbite type Ba ferrite, the chemical formula of the substituent is: 8aFe12-(x+y+2)MIIxMvySn70
It is represented by 19. Here, x, y, and z are the substitution amounts of Mu, Mv, and Sn elements per ferrite chemical formula.
Ｍｎ、ＭｖおよびＳｎはそれぞれ２価、５価、４価であ
り、かつ置換されるＦｅ原子は３価であるから価格数補
償を考慮するとｙ・（ｘ−ｚ）／２の関係が成り立つ。Mn, Mv, and Sn are divalent, pentavalent, and tetravalent, respectively, and the substituted Fe atom is trivalent, so the relationship of y·(xz)/2 holds true when consideration is given to price and number compensation.
すなわちＭｖの置換量は、Ｍｎの置換量とＳｎの置ｍｕ
から一義的に決定される。In other words, the amount of substitution of Mv is the amount of substitution of Mn and the position of Sn.
It is determined uniquely from
本発明の磁性粉においては、Ｓｎの置換量の適正範囲を
六方晶系フェライトの１化学式当り ０．０５〜０．５
個の範囲に限定ずろ。Ｓｎ置換量が０．０５個未満では
保磁力（ＩＩｃ）の温度依存性が充分確保できず、逆に
０．５個を越えると磁性粉の飽和磁化の低下が著しく、
磁気記録用媒体としての充分な出力特性が得られなくな
る。In the magnetic powder of the present invention, the appropriate range of Sn substitution is 0.05 to 0.5 per chemical formula of hexagonal ferrite.
Limited to a range of individuals. If the amount of Sn substitution is less than 0.05, the temperature dependence of the coercive force (IIc) cannot be sufficiently ensured, and if it exceeds 0.5, the saturation magnetization of the magnetic powder will be significantly reduced.
It becomes impossible to obtain sufficient output characteristics as a magnetic recording medium.
本発明の磁性粉を製造する方法としては、例えば、目的
とする六方晶系フェライトを形成するのに必要な各元素
の酸化物、炭酸化物をホウ酸のようなガラス形成物質と
ともに溶融し、得られた融液を急冷してガラスを形成し
、ついでこのガラスを所定温度で熱処理して目的とする
Ｂａフェライトの結晶粉を析出させ、最後にガラス成分
を酸処理によって除去するガラス結晶化法の他、共沈−
焼成法、水熱法等が適用可能である。しかしながらこれ
らの方法の内、特にガラス結晶１ヒ法が本発明には好適
である。The magnetic powder of the present invention can be produced by, for example, melting oxides and carbonates of each element necessary to form the desired hexagonal ferrite together with a glass-forming substance such as boric acid. The glass crystallization method involves rapidly cooling the resulting melt to form glass, then heat-treating the glass at a predetermined temperature to precipitate the target Ba ferrite crystal powder, and finally removing the glass components by acid treatment. Others, coprecipitation-
A calcination method, a hydrothermal method, etc. are applicable. However, among these methods, the glass crystal method is particularly suitable for the present invention.
本発明の六方晶系フェライト磁性粉は、通常バインダ樹
脂と共に、支持体表面に塗布されて磁気記録用媒体とし
て用いられる。この磁性微粒子と共に磁性層を構成する
バインダ樹脂としては、例えば塩化ビニル−酢酸ビニル
共重合体、塩化ビニリデン系共重合体、アクリル酸エス
テル系共重合体、ポリビニルブチラール系樹脂、ポリウ
レタン系樹脂、ポリエステル系樹脂、セルロース誘導体
、エポキシ樹脂、あるいはこれらの２種以上の混合物な
どが用いられる。また磁性層中には前記磁性粉やバイン
ダ樹脂の他に分散剤、潤滑剤、研摩剤、帯電防止剤等の
添加剤か必要に応じて適宜含有させることができる。The hexagonal ferrite magnetic powder of the present invention is usually used as a magnetic recording medium by being coated on the surface of a support together with a binder resin. Examples of the binder resin that constitutes the magnetic layer together with the magnetic fine particles include vinyl chloride-vinyl acetate copolymer, vinylidene chloride copolymer, acrylic ester copolymer, polyvinyl butyral resin, polyurethane resin, and polyester resin. Resins, cellulose derivatives, epoxy resins, or mixtures of two or more of these are used. In addition to the magnetic powder and binder resin, the magnetic layer may contain additives such as a dispersant, a lubricant, an abrasive, an antistatic agent, and the like, if necessary.
（作用）
本発明の磁性粉は、平均粒径０．０２〜０．２μｌとさ
れているので磁気記録用媒体としたとき充分な再生出力
を有し、かつ高密度記録の再生時のノイズが小さくなっ
ている。また、その構成元素であるＦｅ原子の一部を、
２価金属と、Ｎｂ、 ＳｂおよびＴａがら選ばれた少
なくとも １種の５価金属と、Ｓｎ原子で置換して保磁
力を２００〜２００００’、ｅとしたので、記録用媒体
としたとき記録信号が充分残存し、かつ通常のヘッドに
よる信号の書き込みが可能である。特に六方晶系フェラ
イト磁性粉の「ｅ原子の一部が１化学式当たり ０．０
５〜０．５個の範囲のＳｎ原子で置換されて、保磁力の
温度依存性が減少している。(Function) Since the magnetic powder of the present invention has an average particle size of 0.02 to 0.2 μl, it has sufficient reproduction output when used as a magnetic recording medium, and has no noise during reproduction of high-density recording. It's getting smaller. In addition, some of the Fe atoms, which are the constituent elements,
Since the divalent metal and at least one pentavalent metal selected from Nb, Sb and Ta are substituted with Sn atoms to have a coercive force of 200 to 20,000', e, when used as a recording medium, the recording signal remains, and signals can be written using a normal head. In particular, in hexagonal ferrite magnetic powder, some of the e atoms are 0.0 per chemical formula.
Substitution with Sn atoms in the range of 5 to 0.5 reduces the temperature dependence of coercive force.
（実施例） 次に本発明の実施例について説明する。(Example) Next, examples of the present invention will be described.
実施例
化学式
％式％
で表されるフェライトにおいて、Ｍｎ＝Ｃ０１２ｎ、Ｍ
ｖ＝Ｎｂ、 ＳｂもしくはＴａとし、ｘ＝ ０．９０に
固定し、釘の置換量２を０，０２〜０．６の範囲に変え
たＢａフェライト磁性粉をガラス結晶化法により、次の
ようにして作製した。Examples In the ferrite represented by the chemical formula % formula %, Mn=C012n, M
Ba ferrite magnetic powder with v = Nb, Sb or Ta, x = fixed at 0.90, and the nail replacement amount 2 varied in the range of 0.02 to 0.6 was processed by the glass crystallization method as follows. It was made as follows.
まずＢ２Ｏ３・Ｂａ Ｏガラスに、上記Ｂａフェライト
組成を構成するように調合された、８２０３、Ｆｅ２
０３ 、Ｃｏ Ｏｏ（もしくはＩｎ Ｏ） 、Ｎｂ２
０５ （もしくはＳｂ２ ０５、Ｔａ２ ０５） 、
Ｓｎ ０２を同時に加えて１３５０°Ｃにて溶融し、圧
延急冷して上記成分を含むガラスを作製した。First, 8203, Fe2, which was formulated to constitute the above Ba ferrite composition, was added to B2O3・BaO glass.
03, CoOo (or InO), Nb2
05 (or Sb2 05, Ta2 05),
Sn 02 was added at the same time and melted at 1350°C, followed by rolling and quenching to produce a glass containing the above components.
次にこのガラスを８００°Ｃで４時間加熱することによ
りマトリックス中に、Ｍ■、Ｍｙお°よびＳｎで置換さ
れたＢａフェライトを析出させた。最後にこのガラスを
酢酸で洗浄してＢａフェライト磁性粉を得た。得られた
磁性粉の平均粒径は約８００人と微細なものであった。Next, this glass was heated at 800°C for 4 hours to precipitate Ba ferrite substituted with M■, My° and Sn in the matrix. Finally, this glass was washed with acetic acid to obtain Ba ferrite magnetic powder. The average particle size of the obtained magnetic powder was about 800 particles, which was very fine.
また得られた磁性粉の保磁力（Ｈｃ）、飽和磁化（σｇ
）の値を表に示す。In addition, the coercive force (Hc) and saturation magnetization (σg) of the obtained magnetic powder
) values are shown in the table.
次にこれらのＢａミツエライト粉粒子用いて、次の組成
の磁性塗料を調整した（ただし部は重量部を示す）。Next, a magnetic paint having the following composition was prepared using these Ba mitzerite powder particles (where parts indicate parts by weight).
Ｂａフェライト粒子 １００部塩
化ビニル−酢酸ビニル共重合体 １０部ポリウレタ
ン １０部酸化アルミニウム
２部潤滑剤
１．５部分散剤（レシチン）
２部メチルエチルケトン ７０
部トルエン ７０部シク
ロへキサノン ４０部硬化剤
５部このようにして得ら
れた５種の塗「１を、厚さ１５μｍのポリエチレンテレ
フタレートフィルム上に塗布し、カレンダ処理、スリ・
ソティング加工を行って厚さ ３．５μｍ？ｊ′）磁性
層を形成して磁気チー１３作製した
この磁気テープの室温での保磁力（Ｉｌｃ）、および２
０〜１００°Ｃ間における保磁力（ｔｌｃ）の１部度変
化Δ１１Ｃ／Δ■をｎＩ定した。その結果を次表に併記
する。Ba ferrite particles 100 parts Vinyl chloride-vinyl acetate copolymer 10 parts Polyurethane 10 parts Aluminum oxide
two part lubricant
1.5 Partial dispersant (lecithin)
2 parts methyl ethyl ketone 70
Part toluene 70 parts Cyclohexanone 40 parts Hardening agent
5 parts The 5 types of coating 1 thus obtained were applied onto a polyethylene terephthalate film with a thickness of 15 μm, calendered, and scratched.
Thickness 3.5μm after sorting process? j') The coercive force (Ilc) at room temperature of this magnetic tape prepared by forming a magnetic layer and magnetic tape 13, and 2
The one-part change Δ11C/Δ■ in coercive force (tlc) between 0 and 100°C was determined by nI. The results are also listed in the table below.
（以下余白）
ε発明の効果］
以上の実施例からも明らかなように、本発明の磁性粉は
、粒径が＠綱で高密度記録が可能であるばかりでなく、
磁化の低減などを伴うことなく、保磁力（ｌｌｃ）の温
度特性が向上しており、効果的に磁性粉およびそれを用
いた記録媒体の保磁力の温度特性を改善することができ
る。(The following is a blank space) εEffects of the Invention As is clear from the above examples, the magnetic powder of the present invention not only has a particle size of @2 and is capable of high-density recording;
The temperature characteristics of coercive force (llc) are improved without reducing magnetization, and the temperature characteristics of coercive force of magnetic powder and recording media using the same can be effectively improved.
Claims (7)
２０００Ｏｅの六方晶系フェライト磁性粉において、そ
の構成元素であるＦｅ原子の一部が２価金属と、Ｎｂ、
ＳｂおよびＴａから選ばれた少なくとも１種の５価金属
と、１化学式当たり０．０５〜０．５個の範囲のＳｎ原
子で置換されていることを特徴とする高密度磁気記録用
磁性粉。(1) Average particle size 0.02~0.2μm, coercive force 200~
In the hexagonal ferrite magnetic powder of 2000 Oe, some of the constituent Fe atoms are divalent metals, Nb,
A magnetic powder for high-density magnetic recording, characterized in that at least one pentavalent metal selected from Sb and Ta is substituted with 0.05 to 0.5 Sn atoms per chemical formula.
イト型フェライトであることを特徴とする特許請求の範
囲第１項記載の高密度磁気記録用磁性粉、(2) Magnetic powder for high-density magnetic recording according to claim 1, wherein the hexagonal ferrite magnetic powder is magnetoplumbite ferrite;
求の範囲第１項または第２項記載の高密度磁気記録用磁
性粉。(3) The magnetic powder for high-density magnetic recording according to claim 1 or 2, wherein the divalent metal is Co.
．２個であることを特徴とする特許請求の範囲第１項な
いし第３項のいずれか１項記載の高密度磁気記録用磁性
粉。(4) The amount of substitution per chemical formula of divalent metal is 0.5 to 1
．． The magnetic powder for high-density magnetic recording according to any one of claims 1 to 3, characterized in that the number of particles is two.
原子の一部が、２価金属と、Ｎｂ、ＳｂおよびＴａから
選ばれた少なくとも１種の５価金属と、１化学式当たり
０．０５〜０．５個の範囲のＳｎ原子で置換されている
平均粒径０．０２〜０．２μｍ、保磁力２００〜２００
０Ｏｅの六方晶系フェライト磁性粉が、支持体表面に付
着されていることを特徴とする磁気記録用媒体。(5) Fe, a constituent element of hexagonal ferrite magnetic powder
Some of the atoms are substituted with a divalent metal, at least one pentavalent metal selected from Nb, Sb, and Ta, and Sn atoms in the range of 0.05 to 0.5 per chemical formula. Average particle size 0.02-0.2μm, coercive force 200-200
A magnetic recording medium characterized in that 0 Oe hexagonal ferrite magnetic powder is attached to the surface of a support.
イト型フェライトであることを特徴とする特許請求の範
囲第５項記載の磁気記録用媒体。(6) The magnetic recording medium according to claim 5, wherein the hexagonal ferrite magnetic powder is magnetoplumbite ferrite.
支持体表面に塗布されていることを特徴とする特許請求
の範囲第５項または第６項記載の磁気記録用媒体。(7) Hexagonal ferrite together with binder resin,
7. The magnetic recording medium according to claim 5 or 6, wherein the magnetic recording medium is coated on the surface of a support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62025909A JP2585243B2 (en) | 1987-02-06 | 1987-02-06 | Magnetic powder for high density magnetic recording and magnetic recording medium using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62025909A JP2585243B2 (en) | 1987-02-06 | 1987-02-06 | Magnetic powder for high density magnetic recording and magnetic recording medium using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63193504A true JPS63193504A (en) | 1988-08-10 |
| JP2585243B2 JP2585243B2 (en) | 1997-02-26 |
Family
ID=12178904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62025909A Expired - Lifetime JP2585243B2 (en) | 1987-02-06 | 1987-02-06 | Magnetic powder for high density magnetic recording and magnetic recording medium using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2585243B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5062983A (en) * | 1989-05-11 | 1991-11-05 | Nippon Zeon Co., Ltd. | Magnetic powder for magnetic recording media |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6364922A (en) * | 1986-09-05 | 1988-03-23 | Nippon Zeon Co Ltd | Magnetic powder for magnetic recording |
-
1987
- 1987-02-06 JP JP62025909A patent/JP2585243B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6364922A (en) * | 1986-09-05 | 1988-03-23 | Nippon Zeon Co Ltd | Magnetic powder for magnetic recording |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5062983A (en) * | 1989-05-11 | 1991-11-05 | Nippon Zeon Co., Ltd. | Magnetic powder for magnetic recording media |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2585243B2 (en) | 1997-02-26 |
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