JPH0645462B2 - Method for manufacturing barium ferrite powder - Google Patents
Method for manufacturing barium ferrite powderInfo
- Publication number
- JPH0645462B2 JPH0645462B2 JP13702185A JP13702185A JPH0645462B2 JP H0645462 B2 JPH0645462 B2 JP H0645462B2 JP 13702185 A JP13702185 A JP 13702185A JP 13702185 A JP13702185 A JP 13702185A JP H0645462 B2 JPH0645462 B2 JP H0645462B2
- Authority
- JP
- Japan
- Prior art keywords
- barium
- barium ferrite
- acid
- ferrite powder
- alkali hydroxide
- 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
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- Compounds Of Iron (AREA)
- Hard Magnetic Materials (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、水熱合成法で六角板状のマグネトプランバイ
ト型バリウムフェライト粉末を製造する方法の改良に関
するものである。The present invention relates to an improvement in a method for producing hexagonal plate-shaped magnetoplumbite-type barium ferrite powder by a hydrothermal synthesis method.
近年磁気記録の高密度化の要求に伴い，バリウムフェラ
イト（マグネトプランバイト型）を磁気記録媒体として
用いる垂直磁気記録方式の開発が進められている。With the recent demand for higher density magnetic recording, the development of a perpendicular magnetic recording system using barium ferrite (magnetoplumbite type) as a magnetic recording medium is under way.
垂直磁気記録方式に用いられるバリウムフェライトとし
ては，保磁力が適当な値（400〜1500 Oe）で，飽和磁化
ができるだけ高く，粒子が小さく均一で，粒子の凝集，
焼結などがなく，分散性のよいものが望まれている。For barium ferrite used in perpendicular magnetic recording, coercive force is an appropriate value (400-1500 Oe), saturation magnetization is as high as possible, particles are small and uniform, and particle aggregation,
It is desired to have good dispersibility without sintering.
従来バリウムフェライトの製造法としては，例えば共沈
法，フラックス法，水熱合成法など種々の方法が知られ
ており，水熱合成法については，例えば特公昭46−3545
号公報，特開昭56−149328号公報，特開昭56−160328号
公報，特開昭56−155023号公報，特開昭58−2224号公
報，特開昭59−161002号公報，特開昭59−164640号公
報，特開昭59−164641号公報などで提案されている。Conventionally, various methods such as a coprecipitation method, a flux method, and a hydrothermal synthesis method have been known as methods for producing barium ferrite. For the hydrothermal synthesis method, for example, Japanese Patent Publication No. 46-3545.
JP-A-56-149328, JP-A-56-160328, JP-A-56-155023, JP-A-58-2224, JP-A-59-161002, It is proposed in Japanese Patent Laid-Open Nos. 59-164640 and 59-164641.
従来公知の水熱合成法によるバリウムフェライトは，一
般に粒子の板状比が高く，配向性のよいものであるが，
粒度分布幅が広くて均一でなかったり，また熱処理によ
りバリウムフェライトの結晶化を進行させてしっかりし
た形状の粒子にしようとすると粒子間の焼結が生じ易く
なったりして，塗料化（インク化）の際の分散性，配向
性，塗膜の平滑性，光沢度などが悪くなったり，また飽
和磁化が５０emu／ｇ程度かそれよりも低いものしか得
られなかったりする難点がある。Barium ferrite produced by the conventionally known hydrothermal synthesis method generally has a high plate ratio of particles and good orientation.
The particle size distribution width is wide and not uniform, and when heat treatment is used to promote crystallization of barium ferrite to form particles with a solid shape, sintering between particles is likely to occur. In that case, the dispersibility, the orientation, the smoothness of the coating film, the glossiness, etc. may deteriorate, and the saturation magnetization may be only about 50 emu / g or lower.
本発明の目的は，水熱合成法における前記難点が改良さ
れたバリウムフェライト粉末の製造法を提供することに
ある。An object of the present invention is to provide a method for producing barium ferrite powder in which the above-mentioned problems in the hydrothermal synthesis method are improved.
本発明は，バリウム塩およびバリウム１グラム原子に対
して鉄が５〜１１グラム原子に相当する量の鉄塩を，水
媒体中で水酸化アルカリと反応させた後の水酸化アルカ
リの濃度が３モル／以上になるように中和当量以上の
水酸化アルカリを用いて反応させ，生成した沈殿物のス
ラリを１３０〜３００℃で水熱処理した後，６５０〜９
５０℃で焼成し，得られた焼成物を炭素数３〜４の有機
酸で処理することを特徴とするバリウムフェライト粉末
の製造法に関するものである。According to the present invention, the concentration of alkali hydroxide after reacting barium salt and an amount of iron salt corresponding to 5 to 11 grams of iron with respect to 1 gram atom of barium in an aqueous medium is 3%. After reacting with an alkali hydroxide having a neutralization equivalent or more so as to have a mol / above, the slurry of the produced precipitate is hydrothermally treated at 130 to 300 ° C., and then 650 to 9
The present invention relates to a method for producing barium ferrite powder, which comprises firing at 50 ° C. and treating the obtained fired product with an organic acid having 3 to 4 carbon atoms.
本発明において，バリウム塩は水に可溶性の硝酸バリウ
ム，塩化バリウム，水酸化バリウム等が一般に使用され
る。また鉄塩としては，一般に硝酸第二鉄，塩化第二鉄
のごとき水に可溶性のものが使用される。バリウム塩お
よび鉄塩は，一般に水に溶解させて使用される。その際
バリウム塩と鉄塩は，混合水溶液として調製しても，バ
リウム塩の水溶液と鉄塩の水溶液とを別々に調製して使
用してもよい。In the present invention, water-soluble barium nitrate, barium chloride, barium hydroxide or the like is generally used as the barium salt. As the iron salt, those soluble in water such as ferric nitrate and ferric chloride are generally used. Barium salt and iron salt are generally used after being dissolved in water. At that time, the barium salt and the iron salt may be prepared as a mixed aqueous solution, or the barium salt aqueous solution and the iron salt aqueous solution may be separately prepared and used.
また鉄塩は，バリウム１グラム原子に対して鉄が５〜１
１グラム原子に相当する量で使用される。Iron salt has 5 to 1 iron for 1 gram atom of barium.
Used in amounts equivalent to 1 gram atom.
また水酸化アルカリと反応させる際，従来のバリウムフ
ェライトに添加されている種々の元素，例えばCo,Ni,M
n,Zn,Ca,Pb,Sr,Ti,In,Nb,La,Ce,Pr,Smなどの水に可溶性
の塩をバリウム塩，鉄塩等の水溶液に若干添加すること
ができ，特にCoおよびTiの塩の添加は、磁気特性の向上
および粒子径をコントロールするうえで好ましい。Coお
よびTiの塩としては一般に塩化物，硝酸塩などが使用さ
れるが，その添加量は，溶液中の鉄原子に対する原子
比，Co／Fe，Ti／Feがそれぞれ，0.01〜0.20，好ましく
は0.02〜0.15になるようにするのが好適である。また前
記バリウムと鉄との原子比Fe／Baが５よりも小さくなる
とマグネトプランバイト型バリウムフェライトの生成量
が少なく，六角板状の形状も悪くなり，Fe／Baが１１よ
り大きくなるとα−Fe2O33の生成があり，またバリウム
フェライトの粒径も大きく，磁気特性も劣ってくる。な
お，バリウム塩の水溶液を調製する場合は，バリウム塩
の濃度が30〜230mmol／の範囲になるようにするのが
六角板状の形状のよいバリウムフェライトを得るうえで
望ましい。Also, when reacting with alkali hydroxide, various elements such as Co, Ni, M added to conventional barium ferrite are used.
Water-soluble salts such as n, Zn, Ca, Pb, Sr, Ti, In, Nb, La, Ce, Pr, Sm can be added to the aqueous solution of barium salt, iron salt, etc. The addition of a Ti salt is preferable for improving the magnetic properties and controlling the particle size. Chlorides, nitrates, etc. are generally used as Co and Ti salts. The addition amount of each is 0.01 to 0.20, preferably 0.02, in atomic ratio with respect to iron atoms in the solution, Co / Fe, and Ti / Fe. It is preferable that the value be ˜0.15. When the atomic ratio Fe / Ba of barium to iron is smaller than 5, the amount of magnetoplumbite-type barium ferrite produced is small, the hexagonal plate shape is also poor, and when Fe / Ba is larger than 11, α-Fe 2 O 33 is generated, and the grain size of barium ferrite is large, resulting in poor magnetic properties. When preparing an aqueous solution of barium salt, it is desirable that the concentration of barium salt is in the range of 30 to 230 mmol / in order to obtain barium ferrite having a good hexagonal plate shape.
水酸化アルカリと反応させる際の混合順序は特に制限さ
れない。例えばバリウム塩の水溶液と鉄塩の水溶液とを
別々に調製し，バリウム塩の水溶液に鉄塩の水溶液およ
び水酸化アルカリの水溶液を加える順序で反応させて
も，バリウム塩と鉄塩との混合水溶液を調製し，これに
水酸化アルカリを加える順序で反応させても，またこれ
以外の順序で反応させてもよい。反応させる際の温度は
３０〜１００℃が適当である。水酸化アルカリの添加量
は，水酸化アルカリを加えて反応させた後の溶液中の水
酸化アルカリの濃度が３mol／以上，好ましくは５〜
８mol／になるように中和当量以上，好ましくは２〜
８倍当量の範囲で使用される。The order of mixing when reacting with alkali hydroxide is not particularly limited. For example, even if an aqueous solution of barium salt and an aqueous solution of iron salt are separately prepared and reacted in the order of adding an aqueous solution of iron salt and an aqueous solution of alkali hydroxide, a mixed aqueous solution of barium salt and iron salt is added. May be prepared and the reaction may be carried out in the order in which alkali hydroxide is added, or in any other order. 30-100 degreeC is suitable for the temperature at the time of making it react. The amount of the alkali hydroxide added is such that the concentration of the alkali hydroxide in the solution after the reaction by adding the alkali hydroxide is 3 mol / or more, preferably 5 to
Neutralization equivalent or more, preferably 2 to 8 mol /
Used in a range of 8 equivalents.
水酸化アルカリを加えた後の溶液中の水酸化アルカリの
濃度が低かったり，水酸化アルカリの量が少なすぎる
と，粒径が大きく，板状比（粒径／厚さ）が小さくな
り，粒度分布が悪かったり，またγ−Fe2O3の生成があ
り，また過度に水酸化アルカリを多くするのは経済的で
ない。If the concentration of the alkali hydroxide in the solution after adding the alkali hydroxide is too low or the amount of the alkali hydroxide is too small, the particle size becomes large and the plate ratio (particle size / thickness) becomes small. The distribution is bad, γ-Fe 2 O 3 is formed, and it is not economical to increase the amount of alkali hydroxide excessively.
水酸化アルカリとしては，水酸化ナトリウム，水酸化カ
リウムなどが好適であり，水酸化アルカリは一般に水に
溶解させて添加されるが溶解させずに添加してもよい。
また添加にあたっては一度に添加する方法をとっても段
階的に添加する方法を採用してもよい。As the alkali hydroxide, sodium hydroxide, potassium hydroxide and the like are preferable, and the alkali hydroxide is generally dissolved in water and added, but it may be added without being dissolved.
In addition, the addition may be carried out all at once or in stages.
水酸化アルカリとの反応によってバリウム，鉄，さらに
は前記添加金属元素等の金属水酸化物を含む沈殿が生成
する。この沈殿物のスラリは，これを130〜300℃，好ま
しくは150〜270℃に加熱保持して水熱処理すると，バリ
ウムフェライトの微細な結晶の生成，沈殿する。なおこ
の結晶は化学組成的にはマグネトプランバイト型のバリ
ウムフェライトと同じ構造を有しているが，磁気特性，
特に飽和磁化が充分でない。水熱処理時間は普通0.5〜
２０時間程度であり，水熱処理には普通オートクレーブ
が採用される。By the reaction with the alkali hydroxide, a precipitate containing barium, iron and a metal hydroxide such as the above-mentioned added metal element is formed. The slurry of the precipitate is heated and kept at 130 to 300 ° C., preferably 150 to 270 ° C. and hydrothermally treated to form and precipitate fine crystals of barium ferrite. This crystal has the same chemical composition as the magnetoplumbite-type barium ferrite, but its magnetic properties
Especially, the saturation magnetization is not sufficient. Hydrothermal treatment time is usually 0.5 ~
It takes about 20 hours, and an autoclave is usually used for hydrothermal treatment.
水熱処理によって生成する結晶は後の工程で核（種晶）
の役割を果すが，水熱処理温度が低すぎると結晶の生成
が充分でなく，また高すぎると最終的に得られるバリウ
ムフェライト粉末の粒径が大きくなるので適当でない。Crystals generated by hydrothermal treatment are nuclei (seed crystals) in the subsequent process
However, if the hydrothermal treatment temperature is too low, the formation of crystals will be insufficient, and if it is too high, the grain size of the barium ferrite powder finally obtained will be large, which is not suitable.
水熱処理して生成させた微細な結晶の沈殿物を含むスラ
リは，これから沈殿物を分離して水洗し，遊離のアルカ
リ分を除去する。沈殿物は，６５０〜９５０℃，好まし
くは７００〜９００℃で焼成する。なお，焼成に先だっ
て沈殿物を乾燥し，水分を除去しておくのが望ましい。The slurry containing fine crystal precipitates generated by hydrothermal treatment is separated from the slurry and washed with water to remove free alkali components. The precipitate is calcined at 650-950 ° C, preferably 700-900 ° C. It is desirable to dry the precipitate to remove water before firing.
焼成温度は，これがあまり低すぎると飽和磁化が低くな
ったり，長時間を要したりし，また高すぎると粒子の成
長が大きく，粒子径が大きくなるので適当でない。焼成
時間は一般に１０分〜２時間程度が適当であり，焼成雰
囲気は特に制限されないが，一般に空気雰囲気が便利で
ある。また焼成にあたっては，６５０〜７５０℃程度の
低温で焼成し，次いで７５０〜９５０℃程度の高温で焼
成する２段焼成法をとっても，１度で焼成する１段焼成
法をとってもよい。If the firing temperature is too low, the saturation magnetization will be low, or it will take a long time, and if it is too high, the particle growth will be large and the particle size will be large, which is not suitable. The firing time is generally 10 minutes to 2 hours, and the firing atmosphere is not particularly limited, but an air atmosphere is generally convenient. In the firing, a two-step firing method of firing at a low temperature of about 650 to 750 ° C. and then firing at a high temperature of about 750 to 950 ° C. or a one-step firing method of firing at one time may be used.
焼成物（バリウムフェライト）は，これを炭素数３〜４
の有機酸で処理する。この有機酸で処理する前に従来公
知の水，塩酸，酢酸等を用いて焼成物を洗浄してもよ
く，一般には水で洗浄した後炭素数３〜４の有機酸で処
理する。The fired product (barium ferrite) has 3 to 4 carbon atoms.
Treat with organic acid. Prior to the treatment with this organic acid, the fired product may be washed with conventionally known water, hydrochloric acid, acetic acid or the like, and generally, it is washed with water and then treated with an organic acid having 3 to 4 carbon atoms.
本発明において炭素数３〜４の有機酸で処理すると粒子
表面に付着しているアルカリ金属イオン，塩素イオン，
過剰の残留水酸化バリウム等の除去効果の向上ととも
に，バリウムフェライト粒子表面が炭素数３〜４の有機
酸で被覆され分散性を向上させる効果があり，塗膜を形
成させた際の光沢度が一段とすぐれたものになる。バリ
ウムフェライトは六角板状の粒子であり，磁気を持って
いるため粒子同志が重なり合い，その粒子をほぐして分
散させるために過度の機械的処理が必要であり，粒子の
重なりをなるべく少なくすることが分散性向上の決めて
の一つになるが，炭素数３〜４の有機酸処理によってこ
れらを改善する効果がある。In the present invention, when treated with an organic acid having 3 to 4 carbon atoms, alkali metal ions, chlorine ions,
In addition to improving the effect of removing excess residual barium hydroxide, etc., the surface of barium ferrite particles is coated with an organic acid having 3 to 4 carbon atoms to improve dispersibility, and the glossiness when a coating film is formed is improved. It will be even better. Barium ferrite is a hexagonal plate-shaped particle, and since it has magnetism, particles of each other overlap each other, and excessive mechanical treatment is required to loosen and disperse the particles, and it is possible to minimize the overlap of particles. It is one of the decisive factors for improving the dispersibility, but the treatment with an organic acid having 3 to 4 carbon atoms has the effect of improving them.
炭素数３〜４の有機酸としては，プロピオン酸，酪酸，
クロトン酸，アクリル酸，メタクリル酸等が好適に使用
される。これら有機酸は水等の溶媒に溶解させて使用す
ることもできる。処理方法としては，焼成物を炭素数３
〜４の有機酸で洗浄処理する方法，有機酸溶液中に浸漬
処理する方法等を挙げることができる。また処理する際
撹拌するのが望ましい。As the organic acid having 3 to 4 carbon atoms, propionic acid, butyric acid,
Crotonic acid, acrylic acid, methacrylic acid and the like are preferably used. These organic acids can also be used after being dissolved in a solvent such as water. As the treatment method, the burned material has 3 carbon atoms.
Examples of the method include a method of washing treatment with an organic acid of to 4 and a method of dipping treatment in an organic acid solution. In addition, it is desirable to stir during processing.
実施例１ 水0.4に，FeCl3・6H2Oを1.53mol，CoCl26H2Oを0.093m
olおよびTiCl4を0.093mol溶解した。別に水0.3に，Ba
Cl2・2H2Oを0.157molを溶解した。またさらに水0.4に
NaOHを16.4mol溶解した。これらの溶液をN2ガス雰囲気
下で混合し，水酸化物の沈殿物を生成させた（沈殿物生
成後の母液のNaOH濃度7.3mol／）。Example 1 In water 0.4, FeCl 3 .6H 2 O 1.53 mol, CoCl 2 6H 2 O 0.093 m
0.093 mol of ol and TiCl 4 was dissolved. Separately water 0.3, Ba
0.157 mol of Cl 2 · 2H 2 O was dissolved. Again to water 0.4
16.4 mol of NaOH was dissolved. These solutions were mixed under a N 2 gas atmosphere to form a hydroxide precipitate (NaOH concentration of the mother liquor after the precipitate was formed was 7.3 mol /).
沈殿物を含むスラリ溶液をオートクレーブに入れ，２６
０℃まで昇温し，２時間同温度に保持して水熱処理後，
スラリをビーカーに入れ水洗を行った。Put the slurry solution containing the precipitate in the autoclave,
After heating to 0 ° C and holding at the same temperature for 2 hours and hydrothermal treatment,
The slurry was placed in a beaker and washed with water.
このようにして，得られたスラリを乾燥した。The slurry thus obtained was dried.
得られた乾燥物は，これを電気炉に入れ，空気雰囲気下
に，８５０℃で１０時間焼成した。この焼成物を水によ
って可溶物（Cl−等）がなくなるまで洗浄した後，プロ
ピオン酸の１wt％水溶液中に入れて撹拌処理した後ろ過
乾燥し，バリウムフェライト粉末を得た。The obtained dried product was placed in an electric furnace and baked in an air atmosphere at 850 ° C. for 10 hours. The calcined product was washed with water until the soluble matter (Cl-, etc.) was removed, put into a 1 wt% aqueous solution of propionic acid, stirred, filtered and dried to obtain barium ferrite powder.
このバリウムフェライト粉末について透過型電子顕微鏡
（TEM）で粒子形状（粒径，厚さ，分布）を測定した結
果（粒子５０個以上の平均値）および振動試料式磁力計
で磁気特性を測定した結果を第１表に示す。The particle shape (particle size, thickness, distribution) of this barium ferrite powder was measured with a transmission electron microscope (TEM) (average value of 50 or more particles), and the magnetic characteristics were measured with a vibrating sample magnetometer. Is shown in Table 1.
また，分散性をみるために，バリウムフェライト粉末を
バインダーおよび溶媒とサンドミルでミーリングした後
のインキを篩目が１μｍの篩でろ過したときのろ過率
（インキ全量が篩を通過した場合をろ過率１００％とす
る），および平滑性をみるために，塗膜での光沢度なら
びに塗膜での角形比，配向比の磁気特性を測定した結果
を第１表に示す。In addition, in order to check the dispersibility, the filtration rate when the ink after milling barium ferrite powder with a binder and solvent with a sand mill was filtered through a sieve with a mesh size of 1 μm (the filtration rate when the total amount of ink passed through the sieve was Table 1 shows the results of measuring the glossiness of the coating film and the magnetic properties of the squareness ratio and orientation ratio of the coating film in order to check the smoothness.
実施例２〜４ 実施例１のプロピオン酸を，クロトン酸（実施例２），
酪酸（実施例３）およびメタクリル酸（実施例５）にか
えたほかは，実施例１と同様にしてバリウムフェライト
粉末を得，実施例１と同様に測定した。その結果を第１
表に示す。Examples 2 to 4 The propionic acid of Example 1 was replaced with crotonic acid (Example 2),
Barium ferrite powder was obtained in the same manner as in Example 1 except that butyric acid (Example 3) and methacrylic acid (Example 5) were used, and the measurement was performed in the same manner as in Example 1. The result is first
Shown in the table.
比較例１ 実施例１とプロピオン酸による処理を行わなかったほか
は，実施例１と同様にしてバリウムフェライト粉末を
得，実施例１と同様に測定した。その結果を第１表に示
す。Comparative Example 1 Barium ferrite powder was obtained in the same manner as in Example 1 except that the treatment with propionic acid was not performed, and the measurement was performed in the same manner as in Example 1. The results are shown in Table 1.
比較例２ 実施例１のプロピオン酸を，酢酸にかえたほかは，実施
例１と同様にしてバリウムフェライト粉末を得，実施例
１と同様に測定した。その結果を第１表に示す。Comparative Example 2 Barium ferrite powder was obtained in the same manner as in Example 1 except that the propionic acid of Example 1 was changed to acetic acid, and the measurement was performed in the same manner as in Example 1. The results are shown in Table 1.
実施例５ 実施例１のBaCl2・2H2Oを0.157molから0.234molに，CoC
l2・6H2OおよびTiCl4をそれぞれ0.093molから0.103mol
に，NaOHを16.4molから14.4molに，水熱処理温度を２６
０℃から230℃に，また焼成温度を850℃から870℃にか
えたほかは，実施例１と同様にしてバリウムフェライト
粉末を得た。測定結果を第１表に示す。Example 5 BaCl 2 .2H 2 O of Example 1 was changed from 0.157 mol to 0.234 mol, CoC
0.103mol l 2 · 6H 2 O and TiCl 4 from 0.093mol respectively
In addition, NaOH from 16.4mol to 14.4mol, hydrothermal treatment temperature 26
Barium ferrite powder was obtained in the same manner as in Example 1 except that the temperature was changed from 0 ° C to 230 ° C and the firing temperature was changed from 850 ° C to 870 ° C. The measurement results are shown in Table 1.
〔発明の効果〕 本発明によると結晶状態のよい六角板状のマグネトプラ
ンバイト型の平均粒径0.1μｍ以下の粒度分布幅の狭い
よく揃ったバリウムフェライト微粉末が得られる。 EFFECTS OF THE INVENTION According to the present invention, a well-aligned barium ferrite fine powder having a hexagonal plate-like magnetoplumbite type having a good crystalline state and having an average particle size of 0.1 μm or less and a narrow particle size distribution width can be obtained.
また本発明によるバリウムフェライト粉末は，特に塗膜
の光沢度においてすぐれており，分散性，配向性，平滑
性などもよい。また本発明によるバリウムフェライト粉
末の板状比は一般に７〜１０の範囲，保磁力は400〜150
0 Oe，飽和磁化は５５emu／ｇを越える。なお保磁力はT
i，Co等の添加でコントロール可能である。Further, the barium ferrite powder according to the present invention is excellent especially in glossiness of the coating film, and has good dispersibility, orientation, smoothness and the like. The plate ratio of the barium ferrite powder according to the present invention is generally in the range of 7 to 10, and the coercive force is 400 to 150.
0 Oe, saturation magnetization exceeds 55 emu / g. The coercive force is T
It can be controlled by adding i, Co, etc.
Claims (2)
対して鉄が５〜１１グラム原子に相当する量の鉄塩を，
水媒体中で水酸化アルカリと反応させた後の水酸化アル
カリの濃度が３モル／以上になるように中和当量以上
の水酸化アルカリを用いて反応させ，生成した沈殿物の
スラリを１３０〜３００℃で水熱処理した後，６５０〜
９５０℃で焼成し，得られた焼成物を炭素数３〜４の有
機酸で処理することを特徴とするバリウムフェライト粉
末の製造法。1. A barium salt and an iron salt in an amount corresponding to 5 to 11 gram atoms of iron per 1 gram atom of barium,
After the reaction with the alkali hydroxide in the aqueous medium, the alkali hydroxide having a neutralization equivalent or more is used so that the concentration of the alkali hydroxide becomes 3 mol / or more, and the slurry of the produced precipitate is adjusted to 130 to After hydrothermal treatment at 300 ℃,
A method for producing barium ferrite powder, which comprises firing at 950 ° C. and treating the obtained fired product with an organic acid having 3 to 4 carbon atoms.
ロトン酸，酪酸，アクリル酸およびメタクリル酸よりな
る群から選択された有機酸である特許請求の範囲第１項
記載のバリウムフェライト粉末の製造法。2. The barium ferrite powder according to claim 1, wherein the organic acid having 3 to 4 carbon atoms is an organic acid selected from the group consisting of propionic acid, crotonic acid, butyric acid, acrylic acid and methacrylic acid. Manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13702185A JPH0645462B2 (en) | 1985-06-25 | 1985-06-25 | Method for manufacturing barium ferrite powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13702185A JPH0645462B2 (en) | 1985-06-25 | 1985-06-25 | Method for manufacturing barium ferrite powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61295237A JPS61295237A (en) | 1986-12-26 |
| JPH0645462B2 true JPH0645462B2 (en) | 1994-06-15 |
Family
ID=15188980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13702185A Expired - Lifetime JPH0645462B2 (en) | 1985-06-25 | 1985-06-25 | Method for manufacturing barium ferrite powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0645462B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5390756B2 (en) * | 2007-08-02 | 2014-01-15 | 関東電化工業株式会社 | Method for producing flaky Ba ferrite fine particles |
| CN107207277B (en) * | 2015-01-27 | 2020-09-04 | 保德科技股份有限公司 | Plate-like ferrite particles for pigments having metallic luster |
| JP6718162B2 (en) * | 2016-12-28 | 2020-07-08 | 国立研究開発法人産業技術総合研究所 | Composite magnetic particle, radio wave absorber, and method for producing composite magnetic particle |
-
1985
- 1985-06-25 JP JP13702185A patent/JPH0645462B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61295237A (en) | 1986-12-26 |
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