JPS62265122A - Production of spinel ferrite coating oriented hexagonal ferrite plate powder - Google Patents
Production of spinel ferrite coating oriented hexagonal ferrite plate powderInfo
- Publication number
- JPS62265122A JPS62265122A JP10791386A JP10791386A JPS62265122A JP S62265122 A JPS62265122 A JP S62265122A JP 10791386 A JP10791386 A JP 10791386A JP 10791386 A JP10791386 A JP 10791386A JP S62265122 A JPS62265122 A JP S62265122A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- ferrite
- plate
- spinel
- hexagonal ferrite
- 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.)
- Pending
Links
- 239000000843 powder Substances 0.000 title claims abstract description 74
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 63
- 238000004519 manufacturing process Methods 0.000 title claims description 18
- 229910052596 spinel Inorganic materials 0.000 title claims description 18
- 239000011029 spinel Substances 0.000 title claims description 18
- 239000011248 coating agent Substances 0.000 title description 6
- 238000000576 coating method Methods 0.000 title description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 15
- 239000000725 suspension Substances 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 6
- 229910052745 lead Inorganic materials 0.000 claims abstract description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M potassium hydroxide Substances [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims abstract description 4
- 230000032683 aging Effects 0.000 claims abstract 2
- 239000007864 aqueous solution Substances 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- -1 iron ions Chemical class 0.000 claims description 7
- 229910021645 metal ion Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 4
- 229910002651 NO3 Inorganic materials 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 230000005070 ripening Effects 0.000 claims 1
- 239000011734 sodium Substances 0.000 claims 1
- 229910052712 strontium Inorganic materials 0.000 abstract description 3
- 229910052788 barium Inorganic materials 0.000 abstract description 2
- 150000001455 metallic ions Chemical class 0.000 abstract 3
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 abstract 2
- 229910001447 ferric ion Inorganic materials 0.000 abstract 2
- 150000002500 ions Chemical class 0.000 abstract 2
- 229910020517 Co—Ti Inorganic materials 0.000 abstract 1
- 229910017985 Cu—Zr Inorganic materials 0.000 abstract 1
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 description 15
- 239000002245 particle Substances 0.000 description 13
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 4
- 239000006247 magnetic powder Substances 0.000 description 4
- 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 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000011790 ferrous sulphate Substances 0.000 description 3
- 235000003891 ferrous sulphate Nutrition 0.000 description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 3
- 229940067606 lecithin Drugs 0.000 description 3
- 235000010445 lecithin Nutrition 0.000 description 3
- 239000000787 lecithin Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- IWOUKMZUPDVPGQ-UHFFFAOYSA-N barium nitrate Chemical compound [Ba+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O IWOUKMZUPDVPGQ-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 238000001027 hydrothermal synthesis Methods 0.000 description 2
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 244000309464 bull Species 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052598 goethite Inorganic materials 0.000 description 1
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 235000010333 potassium nitrate Nutrition 0.000 description 1
- 239000004323 potassium nitrate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、表面にスピネル型フェライトをコーティング
した結晶配向性ヘキサゴナルフェライト板状粉体の製造
方法に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a crystal-oriented hexagonal ferrite plate-like powder whose surface is coated with spinel-type ferrite.
従来の技術
結晶配向性へキサゴナルフエライＮｆｆ１状粉体、すな
わち、バリウムフェライト （Ｂ ａ Ｆ ｅ ｌ！０
６ ）やストロンチウムフェライト （ＳｒＦｅｌ！Ｏ
，）の結晶学的に０面（（１０１り面）が成長した結晶
配向性板状粒子の製造方法として、水熱合成法やガラス
結晶化法などの方法が確立されており、現在、これらの
方法で上記の板状粉体が製造されている（たとえば、エ
ム、キャラ。ビーニーエルエル、シーエイティーエム。Conventional technology Hexagonal ferrite Nff1-like powder with crystal orientation, that is, barium ferrite (B a F e l!0
6) and strontium ferrite (SrFel!O
, ), methods such as hydrothermal synthesis and glass crystallization have been established as methods for producing crystallographically oriented plate-like particles with crystallographically grown 0-face ((101-face). The above-mentioned plate-shaped powder is manufactured by the method of
ニスオーシー、ジエイピーエヌ、、 ４９（７１，１８
５５（１９７６） ［Ｍ、 Ｋｉｙａｍａ。Niss.O.C., G.P.N., 49 (71, 18
55 (1976) [M, Kiyama.
Ｂｕｌｌ、Ｃｈｅｍ、Ｓｏｃ、Ｊｐｎ、、 ４９（７１
，１８５５（１９７６） ］およびオー、タボ。ティー
、イドアンドエイチ、ヨコヤマ、アイ、イー、イー、イ
ー、ティーアールエーエヌエス、エムエージーエヌ１．
エムニージー−１８Ｆ６１゜１１２２（１９８２） ［
Ｏ，Ｋｕｂｏ、Ｔ、Ｉｄｏ ａｎｄ ）１．Ｙｏｋｏｙ
ａｍａ、ＴＥＥＥＴｒａｎｓ、Ｍａｇｎ、、ガ旦差二二
１８ｆ６１． １１２２（１９８２）コ ）。Bull, Chem, Soc, Jpn, 49 (71
, 1855 (1976)] and Oh, Thabo. T, ID&H, Yokoyama, I, E, E, E, TRLNAS, MAGN1.
MNG-18F61゜1122 (1982) [
O, Kubo, T, Ido and) 1. Yokoy
ama, TEEETrans, Magn,, Gadan difference 22 18f61. 1122 (1982)).
一方、磁気記録用粉体として、一般的に用いられる針状
のｒ−Ｆｅ２Ｏ．粉体において、磁気特性の改善を目的
に、同針状粒子表面にコバルトフェライトをコーティン
グする技術が確立されている。On the other hand, needle-shaped r-Fe2O. In powder, a technique has been established in which the surfaces of acicular particles are coated with cobalt ferrite for the purpose of improving magnetic properties.
発明が解決しようとする問題点
しかしながら、上述のように、高密度記録用磁性粉とし
て使用される結晶配向性ヘキサゴナルフェライト板状粉
体の製造は確立されているにもかかわらず、各種の特性
改善がはかれると考えられるところの前記板状粉体のそ
れぞれの粒子表面にスピネル型フェライトをコーティン
グした構造の板状粉体の製造方法は確立されていない。Problems to be Solved by the Invention However, as mentioned above, although the production of crystal-oriented hexagonal ferrite plate-shaped powder used as magnetic powder for high-density recording has been established, various properties have not been improved. There is no established method for producing a plate-shaped powder having a structure in which spinel-type ferrite is coated on the surface of each particle of the plate-shaped powder, which is considered to be able to be measured.
本発明は、表面にスピネル型フェライトをコーティング
した結晶配向性ヘキサゴナルフェライト板状粉体の製造
方法を提供することを目的としている。An object of the present invention is to provide a method for producing a crystal-oriented hexagonal ferrite plate-like powder whose surface is coated with spinel-type ferrite.
問題点を解決するための手段
本発明は、スピネル型酸化物を形成する金属イオンと二
価の鉄イオンおよび硝酸イオンを含み、かつ結晶学的Ｃ
面が発達した配向性のへキサゴナルフエライｔ−ｉ状粒
子粉体を含むけん濁液に、高濃度のアルカリ水？８液を
加えた混合けん／ｆｉ液をゆっくり撹拌しつつ加熱、Ｐ
成することによって、 、スピネル型フェライトがコ
ーティングされ、かつ０面が発達した配向性ヘキサゴナ
ルフェライト板状粉体の製造を行なうものである。Means for Solving the Problems The present invention comprises metal ions, divalent iron ions and nitrate ions forming a spinel-type oxide, and crystallographic carbon
Highly concentrated alkaline water is added to a suspension containing oriented hexagonal ferrite ti-shaped particle powder with developed surfaces? Heat the mixed suspension/fi solution to which 8 liquids have been added while stirring slowly, P
By doing so, an oriented hexagonal ferrite plate-like powder coated with spinel-type ferrite and having a developed zero plane is manufactured.
作用
バリウムフェライト板状粉体などのヘキサゴナルフェラ
イト板状微粉体は、近年、塗布型の高密度磁気記録メデ
ィア用材料の磁性粉体として注目されている。BACKGROUND ART In recent years, hexagonal ferrite plate-like fine powders such as barium ferrite plate-like powders have attracted attention as magnetic powders for coating-type high-density magnetic recording media materials.
しかしながら、従来から磁気記録メディア用侑性粉体と
しては、スピネル構造の酸化鉄微粉体が使用されており
、この粉体を塗料化するために用いる有機バインダーと
同様のものを上記のヘキサゴナルフェライト板状粉体に
対して用いた場合、うまく分散させ得なかった。However, iron oxide fine powder with a spinel structure has traditionally been used as a transparent powder for magnetic recording media. When used on solid powder, it could not be dispersed well.
本発明は、スピネル型フェライトをコーティングした結
晶配向性ヘキサゴナルフェライト板状粉体の製造方法で
あるので、この製造方法により合成した板状粉体は内部
はヘキサゴナルフェライトであるが、表面はスピネル型
フェライトであるために、この粉体を塗布型磁気記録メ
ディア用磁性粉体として用いる場合、従来のスピネル型
酸化鉄磁性粉体の有機バインダーを用いて、十分にうま
く磁性粒子を分散させ得、塗料化できることから、塗布
型磁気記録メディア用磁性塗料に容易に成るという作用
がなされる。The present invention is a method for producing a crystal-oriented hexagonal ferrite plate-like powder coated with spinel-type ferrite, so the plate-like powder synthesized by this production method has hexagonal ferrite inside, but spinel-type ferrite on the surface. Therefore, when this powder is used as a magnetic powder for coated magnetic recording media, the magnetic particles can be dispersed sufficiently well using the organic binder of the conventional spinel-type iron oxide magnetic powder, and it can be made into a paint. Since it can be used as a magnetic coating material for coated magnetic recording media, it can easily be used as a magnetic coating material for coated magnetic recording media.
実施例
以下に、本発明の一実施例のスピネルフェライトコーテ
ィング配向性ヘキサゴナルフェライト板状粉体の製造方
法について述べる。EXAMPLE Below, a method for manufacturing a spinel ferrite-coated oriented hexagonal ferrite plate-like powder according to an example of the present invention will be described.
硝酸第二鉄（Ｆｅ （Ｎｏ３）、 ・９Ｈ２ｏ）１４
５．４ ｇと、硝酸バリウム（Ｂ ａ （ＮＯｓ ）
２ ）９．４１ ｇを水に溶解した金属塩水溶液３０
０ａ＋ｊ！に、１２ｍｏｌ／ Ｉｌの濃度の水酸化ナト
リウム水溶液２Ｏ０…ｌを混合して作製したコロイド状
けん濁液を２１０℃で２時間オートクレーピングする方
法で、０面が発達した結晶配向バリウムフェライト板状
粒子微粉体を合成した。このようにして得られたバリウ
ムフェライト板状粒子微粉体を十分に水洗浄して乾燥し
た。Ferric nitrate (Fe (No3), 9H2o)14
5.4 g and barium nitrate (B a (NOs )
2) Metal salt aqueous solution 30 in which 9.41 g was dissolved in water
0a+j! A colloidal suspension prepared by mixing 200...l of sodium hydroxide aqueous solution with a concentration of 12 mol/Il is autoclaved at 210°C for 2 hours to produce a crystal-oriented barium ferrite plate with a developed 0-plane. A fine particle powder was synthesized. The barium ferrite plate-like particle fine powder thus obtained was thoroughly washed with water and dried.
一方、硫酸第一鉄（Ｆ ｅ Ｓ ０４ ・７ Ｈ２Ｏ
）１５・Ｏｇを窒素ガス雰囲気で蒸留することによって
得られた窒素ガス置換水に溶解して、硫酸第一鉄水溶液
１００ｍｊ！を作製し、この全量に、あらかじめ上記の
バリウムフェライト板状粒子微粉体３３・Ｏｇを２ ｍ
ｏｌ／ １の濃度の水酸化ナトリウム水溶液２Ｏ０ｍｊ
！にけん濁させたアルカリ性けん濁液を加えて混合して
、コロイド状けん濁液を作製した。このけん濁液を内容
１８００ｍｊ！のフラスコに入れ、６ ｍｏｌ／ ｌｌ
の濃度の硝酸カリウム水溶液５０ｍ１を加え、さらに水
２５０ｍｊ！を加えて、よく混合し、得られた混合けん
濁液に空気を２．５４！／分の２ｉｔ量で吹き込みつつ
、よく撹拌しながら、７０，７５，８０．８５．９０．
９５あるいは１００℃（それぞれ±２℃の精度）で２時
間加熱した。得られた沈澱生成物を十分に水洗し、乾燥
して、試料粉体とした。On the other hand, ferrous sulfate (F e S 04 ・7 H2O
)15.Og was dissolved in nitrogen gas-substituted water obtained by distilling 15.Og in a nitrogen gas atmosphere to make 100 mj of ferrous sulfate aqueous solution! was prepared, and 2 m of the above barium ferrite plate-like fine powder 33.Og was added to the entire amount in advance.
Aqueous sodium hydroxide solution with a concentration of ol/1 2O0mj
! A colloidal suspension was prepared by adding and mixing an alkaline suspension. This suspension has a content of 1800 mJ! into a flask and add 6 mol/ll.
Add 50 ml of potassium nitrate aqueous solution with a concentration of , and add 250 mj of water! , mix well, and add 2.54% of air to the resulting mixed suspension. 70, 75, 80.85.90.
It was heated at 95 or 100°C (accuracy of ±2°C, respectively) for 2 hours. The obtained precipitated product was thoroughly washed with water and dried to obtain a sample powder.
上記の加熱温度が８０〜１００℃の場合の試料粉体はＸ
線回折を行なうことによって、０面が発達したバリウム
フェライト（ＢａＦｓＩ！Ｏ，）とスピネル型フェライ
トであるマグネタイト（Ｆｅ ａ Ｏ４）の二相混合相
であることがわかった。一方、７０および７５℃の加熱
温度で作製した試料粉体は、マグネタイト相の他のゲー
タイト（α−ＦｅＯ（○Ｈ））が含まれていることがわ
かった。前記の８０〜１００℃で得られたそれぞれの試
料粉体粒子は、走査型電子顕微鏡で観察することによっ
て、はじめに作製したバリウムフェライト板状粒子の粒
子表面上に細かな板状粒子が成長したような平板状粒子
であることがわかった。また、同粉体粒子を電子線回折
することによって、この板状形状の粒子は、板状面がバ
リウムフェライトの（００１）面であり、その上にスピ
ネル型フェライトのマグネタイトが成長、したものであ
ることがわかった。When the above heating temperature is 80 to 100℃, the sample powder is
By performing line diffraction, it was found that it was a two-phase mixed phase of barium ferrite (BaFsI!O,) with a developed zero plane and magnetite (Fe a O4), which is a spinel type ferrite. On the other hand, it was found that the sample powders prepared at heating temperatures of 70 and 75° C. contained other goethite (α-FeO(○H)) in the magnetite phase. By observing each of the sample powder particles obtained at 80 to 100°C with a scanning electron microscope, it was found that fine plate-like particles had grown on the surface of the barium ferrite plate-like particles prepared first. They were found to be tabular grains. Furthermore, electron beam diffraction of the powder particles revealed that the plate-shaped particles had a (001) plane of barium ferrite on which magnetite, a spinel-type ferrite, had grown. I found out something.
同扮体の有機バインダーに対する分散性について試験し
た。加熱温度９５℃の場合の上記試料粉体を２ｇ秤取し
、通常の塗布型磁気記録用粉体であるスピネル型酸化鉄
粉体の分散剤として用いられるレシチンおよびリン酸エ
ステル界面活性剤に分散させて沈澱試験を行なった。The dispersibility of the same substance in an organic binder was tested. Weighed out 2g of the above sample powder at a heating temperature of 95°C, and dispersed it in lecithin and phosphate ester surfactant, which are used as a dispersant for spinel iron oxide powder, which is a normal coated magnetic recording powder. A precipitation test was conducted.
比較のために、湿式法で合成したマグネタイト（Ｆ ｅ
ｓ ０４ ）粉体と、本実施例のはしめに記した水熱合
成法による０面が発達したバリウムフェライト板状粒子
粉体の２種類の粉体も同様の分散沈降試験を行なった。For comparison, magnetite (Fe
Similar dispersion-sedimentation tests were also carried out on two types of powder: s 04 ) powder and barium ferrite plate-like particle powder with a developed zero surface produced by the hydrothermal synthesis method described at the end of this example.
分散剤がレシチンの場合の結果を第１図に示し、リン酸
エステル界面活性剤の場合の結果を第２図に示した。Figure 1 shows the results when lecithin was used as the dispersant, and Figure 2 shows the results when the phosphate ester surfactant was used.
第１図においては本発明の粉体、２はマグネタイト粉体
、３はバリウムフェライト粉体である。In FIG. 1, the powder of the present invention, 2 is a magnetite powder, and 3 is a barium ferrite powder.
両図から明らかなように、本発明のスピネル型フェライ
トコーティング板状バリウムフェライト粉体は、マグネ
タイト粉体と同様の良好な分散特性を示し、分散性の悪
いバリウムフェライト粉体と大きく異なり、この粉体の
表面にスピネル型フェライトであるマグネタイトをコー
ティングすることで分散特性が大幅に改善されているこ
とがわかった。As is clear from both figures, the spinel-type ferrite-coated plate-shaped barium ferrite powder of the present invention exhibits good dispersion characteristics similar to magnetite powder, and is significantly different from barium ferrite powder with poor dispersibility. It was found that dispersion characteristics were significantly improved by coating the surface of the body with magnetite, a spinel type ferrite.
なお、板状ヘキサゴナルフェライト微粉体としてバリウ
ムフェライト（Ｂａ０・６Ｆ６２Ｏ．）と同じ結晶構造
をもつヘキサゴナルフェライトで、化学組成がＢａのか
わりにＳｒあるいはＰｂからなる粉体、あるいは、Ｆｅ
のかわりに、ＣＯとＴｉの組み合わせやＣｕとＺｒの組
み合わせの金属元素で置換した組成の板状粉体を用いた
場合も、実施例に示した方法でスピネルフェライトコー
ティング配向性ヘキサゴナルフェライト板状粉体を製造
できた。また、ヘキサゴナルフヱライト板状粉体にコー
ティングすべきスピネルフェライトとしては、実施例で
用いた硫酸第一鉄の一部を、かわりに各種の金属イオン
を含む塩を用いて検討した結果、実施例に示したＦ ｅ
３０□のＦｅの一部を ＣｏＺ◆、 Ｎ ｉ”
、 Ｍｎ”、 Ｍｇ ２＋、 Ｚｎ”。In addition, the plate-shaped hexagonal ferrite fine powder has the same crystal structure as barium ferrite (Ba0.6F62O.), but the chemical composition is Sr or Pb instead of Ba, or Fe
Alternatively, when using a plate-shaped powder having a composition substituted with a metal element such as a combination of CO and Ti or a combination of Cu and Zr, the method shown in the example can be used to coat the oriented hexagonal ferrite plate-shaped powder with spinel ferrite coating. I was able to manufacture a body. In addition, as the spinel ferrite to be coated on the hexagonal ferrite plate powder, we investigated using salts containing various metal ions in place of some of the ferrous sulfate used in the examples, and found that F e shown in the example
Part of the Fe of 30□ is CoZ◆, Ni”
, Mn”, Mg 2+, Zn”.
Ｃｒ”、Ｖ３◆、Ｇｅ”、Ｔｉ４＋で置換されたスピネ
ル型結晶構造のフェライトがコーティング可能であるこ
とがわかった。It has been found that ferrite having a spinel crystal structure substituted with Cr'', V3◆, Ge'', and Ti4+ can be coated.
さらに実施例において、バリウムフェライト板状粒子微
粉体のアルカリ性けん濁液の作製に用いる水酸化ナトリ
ウム水溶液のかわりに水酸化カリウム（Ｋ ＯＨ）を含
む水溶液を使用しても同様のスピネルフェライトコーテ
ィングヘキサゴナルフェライト板状粉体が製造できるこ
ともわかった。Furthermore, in the examples, even if an aqueous solution containing potassium hydroxide (KOH) is used instead of the sodium hydroxide aqueous solution used to prepare the alkaline suspension of barium ferrite plate-like particle fine powder, the same spinel ferrite coating hexagonal ferrite can be obtained. It was also found that plate-shaped powder can be produced.
発明の効果
以上に述べてきたように、本発明の製造方法によれば、
スピネル型フェライトを表面に成長させたＣ面発達の板
状ヘキサゴナルフェライト粒子粉体、すなわち、スピネ
ルフェライトコーティング配向性ヘキサゴナルフェライ
ト板状粉体を容易に製造することが可能になる。Effects of the invention As described above, according to the manufacturing method of the present invention,
It becomes possible to easily produce plate-shaped hexagonal ferrite particle powder with C-plane development on which spinel-type ferrite is grown, that is, a spinel ferrite-coated oriented hexagonal ferrite plate-shaped powder.
第１図は、本発明の製造本発明による粉体のレシチンに
対する分散沈降試験結果のグラフ、第２図は、本発明の
製造方法による粉体のリン酸エステル界面活性剤に対す
る分散沈澱試験結果のグラフである。
１・・・・・・本発明の粉体、２・・・・・・マグネタ
イト粉体、３・・・・・・バリウムフェライト粉体。
第１図
スー°°本す−Ｂ月乃禾カイ本
２−−−７９′子タイト毫分づト
３−一−バリウ４フＩう住十カイ本
静Ｘ待関 （ＩＴｌ
第２図
計１１！ｒ間ｔｈ＋Figure 1 is a graph of the dispersion sedimentation test results for lecithin powder produced by the present invention, and Figure 2 is a graph of the dispersion sedimentation test results for the powder produced by the production method of the present invention for phosphate ester surfactants. It is a graph. 1... Powder of the present invention, 2... Magnetite powder, 3... Barium ferrite powder. Figure 1 Sue ° ° Honsu - B Tsukinohaka Kai Hon 2 --- 79' Child tight page division 3-1 - Bariu 4 Fu I Uju Kai Hon Shizuka 11!r between th+
Claims (7)
鉄イオンおよび硝酸イオンを含み、かつ配向性の板状ヘ
キサゴナルフェライト微粉体を含むけん濁液に、高濃度
のアルカリ水溶液を加えた混合けん濁液をゆっくり撹拌
しつつ加熱、熟成することによるスピネルフェライトコ
ーティング配向性ヘキサゴナルフェライト板状粉体の製
造方法。(1) A suspension containing metal ions forming a spinel-type oxide, divalent iron ions, and nitrate ions, as well as oriented plate-shaped hexagonal ferrite fine powder, is mixed with a highly concentrated alkaline aqueous solution. A method for producing a spinel ferrite-coated oriented hexagonal ferrite plate-like powder by heating and aging a suspension while slowly stirring it.
てＭＯ・６Ｆｅ＿２Ｏ＿３（ただし、ＭはＢａ、Ｂｒお
よびＰｂからなる群より選ばれる１種、あるいは２種以
上共存の金属元素で表わされる）で示される化学組成の
マグネットプランバイト型フェライト粉体であることを
特徴とする特許請求の範囲第（１）項記載のスピネルフ
ェライトコーティング配向性ヘキサゴナルフェライト板
状粉体の製造方法。(2) MO・6Fe_2O_3 as oriented plate-like hexagonal ferrite fine powder (where M is represented by one metal element selected from the group consisting of Ba, Br, and Pb, or two or more metal elements coexisting) A method for producing a spinel ferrite-coated oriented hexagonal ferrite plate-like powder according to claim 1, wherein the powder is a magnetoplumbite-type ferrite powder having a chemical composition.
てＭＯ・６Ｆｅ＿２Ｏ＿３（ただし、ＭはＢａ、Ｂｒお
よびＰｂからなる群より選ばれる１種、あるいは２種以
上共存の金属元素で表わされる）で示される化学組成の
マグネットプランバイト型フェライトの化学組成中の一
部のＦｅ元素を、ＣｏとＴｉの一組の組み合わせ金属元
素、あるいはＣｕとＺｒの一組の組み合わせ金属元素の
いずれかと置換した組成のマグネットプランバイト型フ
ェライト粉体であることを特徴とする特許請求の範囲第
（１）項記載のスピネルフェライトコーティング配向性
ヘキサゴナルフェライト板状粉体の製造方法。(3) MO・6Fe_2O_3 as oriented plate-like hexagonal ferrite fine powder (where M is represented by one metal element selected from the group consisting of Ba, Br, and Pb, or two or more metal elements coexisting) Magnet with a chemical composition A magnet with a composition in which some Fe elements in the chemical composition of plumbite-type ferrite are replaced with either a set of combined metal elements of Co and Ti or a set of combined metal elements of Cu and Zr. A method for producing a spinel ferrite-coated oriented hexagonal ferrite plate-like powder according to claim (1), wherein the powder is a plumbite-type ferrite powder.
Ｆｅ＾２＾＋、Ｃｏ＾２＾＋、Ｎｉ＾２＾＋、Ｍｎ＾２
＾＋、Ｍｇ＾２＾＋、Ｚｎ＾２＾＋、Ｃｒ＾３＾＋、Ｖ
＾３＾＋、Ｇｅ＾４＾＋、Ｔｉ＾４＾＋のいずれか１種
、あるいは２種以上共存の金属イオンであることを特徴
とする特許請求の範囲第（１）項記載のスピネルフェラ
イトコーティング配向性ヘキサゴナルフェライト板状粉
体の製造方法。(4) As metal ions forming spinel-type oxides,
Fe^2^+, Co^2^+, Ni^2^+, Mn^2
^+, Mg^2^+, Zn^2^+, Cr^3^+, V
The spinel ferrite according to claim (1), characterized in that it is a metal ion of one or more of ^3^+, Ge^4^+, and Ti^4^+ A method for producing coated oriented hexagonal ferrite plate-like powder.
熟成することを特徴とする特許請求の範囲第（１）項記
載のスピネルフェライトコーティング配向性ヘキサゴナ
ルフェライト板状粉体の製造方法。(5) heating the mixed suspension at a temperature of 80 to 100°C,
A method for producing a spinel ferrite-coated oriented hexagonal ferrite plate-like powder according to claim (1), which comprises ripening.
ＯＨ）あるいは水酸化カリウム（ＫＯＨ）のいずれかの
水溶液を用いることを特徴とする特許請求の範囲第（１
）項記載のスピネルフェライトコーティング配向性ヘキ
サゴナルフェライト板状粉体の製造方法。(6) As an alkaline aqueous solution, use sodium hydroxide (Na
Claim 1, characterized in that an aqueous solution of either potassium hydroxide (KOH) or potassium hydroxide (KOH) is used.
) A method for producing a spinel ferrite-coated oriented hexagonal ferrite plate-like powder.
結晶学的にＣ面が発達した板状微粉体であることを特徴
とする特許請求の範囲第（１）項記載のスピネルフェラ
イトコーティング配向性ヘキサゴナルフェライト板状粉
体の製造方法。(7) Oriented plate-shaped hexagonal ferrite fine powder,
The method for producing a spinel ferrite-coated oriented hexagonal ferrite plate-like powder according to claim (1), wherein the plate-like fine powder has a crystallographically developed C-plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10791386A JPS62265122A (en) | 1986-05-12 | 1986-05-12 | Production of spinel ferrite coating oriented hexagonal ferrite plate powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10791386A JPS62265122A (en) | 1986-05-12 | 1986-05-12 | Production of spinel ferrite coating oriented hexagonal ferrite plate powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62265122A true JPS62265122A (en) | 1987-11-18 |
Family
ID=14471230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10791386A Pending JPS62265122A (en) | 1986-05-12 | 1986-05-12 | Production of spinel ferrite coating oriented hexagonal ferrite plate powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62265122A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59169937A (en) * | 1983-03-14 | 1984-09-26 | Hitachi Maxell Ltd | Production of magnetic powder |
| JPS59172148A (en) * | 1983-03-18 | 1984-09-28 | Hitachi Maxell Ltd | Magnetic recording medium |
| JPS60255628A (en) * | 1984-05-31 | 1985-12-17 | Toda Kogyo Corp | Fine powder of ba ferrite plate particle for magnetic recording use and its preparation |
-
1986
- 1986-05-12 JP JP10791386A patent/JPS62265122A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59169937A (en) * | 1983-03-14 | 1984-09-26 | Hitachi Maxell Ltd | Production of magnetic powder |
| JPS59172148A (en) * | 1983-03-18 | 1984-09-28 | Hitachi Maxell Ltd | Magnetic recording medium |
| JPS60255628A (en) * | 1984-05-31 | 1985-12-17 | Toda Kogyo Corp | Fine powder of ba ferrite plate particle for magnetic recording use and its preparation |
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