JPH06290923A - Manufacture of ferrite magnet - Google Patents
Manufacture of ferrite magnetInfo
- Publication number
- JPH06290923A JPH06290923A JP5097191A JP9719193A JPH06290923A JP H06290923 A JPH06290923 A JP H06290923A JP 5097191 A JP5097191 A JP 5097191A JP 9719193 A JP9719193 A JP 9719193A JP H06290923 A JPH06290923 A JP H06290923A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- ferrite
- particle size
- ferrite magnet
- average particle
- 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
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 52
- 239000002245 particle Substances 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000001354 calcination Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims description 21
- 238000000465 moulding Methods 0.000 claims description 13
- 238000010298 pulverizing process Methods 0.000 claims description 11
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 238000005245 sintering Methods 0.000 claims description 5
- 238000009826 distribution Methods 0.000 abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 238000007796 conventional method Methods 0.000 abstract 1
- 230000005381 magnetic domain Effects 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 13
- 239000002994 raw material Substances 0.000 description 9
- 239000013078 crystal Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 229910004298 SiO 2 Inorganic materials 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 238000009827 uniform distribution Methods 0.000 description 4
- 238000000137 annealing Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010299 mechanically pulverizing process Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Landscapes
- Hard Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Compounds Of Iron (AREA)
- Magnetic Ceramics (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、磁気特性の向上を図
ったフェライト磁石の製造方法の改良に係り、２段の微
粉砕の間に特定の加熱処理を施して結晶粒径を平均粒径
０．２〜１．５μｍの範囲に揃えることにより、フェラ
イト結晶の粒径分布を約１μｍの単磁区粒子径を最大頻
度とする均一な分布に近づけて磁気特性の向上を可能に
したフェライト磁石の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method for producing a ferrite magnet having improved magnetic properties, and a specific heat treatment is applied between two steps of fine pulverization to change the crystal grain size to the average grain size. By aligning the particle size distribution of the ferrite crystal in the range of 0.2 to 1.5 μm, the ferrite crystal can be improved in magnetic characteristics by bringing the particle size distribution of the ferrite crystal close to a uniform distribution having a single domain particle size of about 1 μm as the maximum frequency. It relates to a manufacturing method.
【０００２】[0002]
【従来の技術】ＢａＯ・６Ｆｅ2Ｏ3、ＳｒＯ・６Ｆｅ2
Ｏ3等の組成式で示されるフェライト磁石はスピーカ、
電装用モーターを初め、各種用途に多量に使用されてい
るが、最近では軽薄短小化の要求が強く、フェライト磁
石に対してもより一層の磁気特性の向上が要求されてい
る。一般にフェライト磁石は粉末冶金的手法にて製造さ
れ、仮焼反応あるいは水溶液法により得られたフェライ
ト磁石を機械的に粉砕後、所要の添加物を添加配合後、
成形、焼結して製造されているが、フェライト磁石の磁
気特性を向上させるためには、前記組成物に種々の添加
物を添加したり、また各製造工程における諸条件の改良
が検討されている。 2. Description of the Related Art BaO.6Fe 2 O 3 and SrO.6Fe 2
A ferrite magnet represented by a composition formula such as O 3 is a speaker,
It is widely used for various purposes such as electric motors, but recently there is a strong demand for lighter, thinner, shorter and smaller magnets, and further improvement in magnetic characteristics is required for ferrite magnets. Generally, ferrite magnets are manufactured by a powder metallurgical method, and after mechanically pulverizing a ferrite magnet obtained by a calcination reaction or an aqueous solution method, after adding and mixing the required additives,
It is manufactured by molding and sintering, but in order to improve the magnetic properties of the ferrite magnet, various additives are added to the composition, and improvement of various conditions in each manufacturing process has been studied. There is.
【０００３】[0003]
【発明が解決しようとする課題】また、フェライト磁石
の製造方法として、原料粉末を微粉砕後、焼鈍する方法
が提案（特開昭６２−２８３６０３号公報）されている
が、前記方法は樹脂等と混連して得られるボンド磁石用
原料粉末に関するもので、微粉砕後の粉末を焼鈍するこ
とにより微粉砕により生じた微粉末の歪を取り除くこと
を目的とするもので、焼鈍時の加熱により個々の粉末粒
子が凝集することが問題点として挙げられる。As a method for producing a ferrite magnet, a method of pulverizing raw material powder and then annealing is proposed (Japanese Patent Laid-Open No. 62-283603). It relates to the raw material powder for bonded magnets obtained by continuously mixing with, and is intended to remove the strain of fine powder generated by fine grinding by annealing the powder after fine grinding, and by heating during annealing. A problem is that individual powder particles are aggregated.
【０００４】この発明は、フェライト磁石に対する磁気
特性の向上の要求を、添加元素等の組成的改善手段に頼
ることなく、通常の製造方法の改良により実現できるフ
ェライト磁石の製造方法の提供を目的としている。An object of the present invention is to provide a method for producing a ferrite magnet, which can meet the demands for improving the magnetic properties of a ferrite magnet by improving the ordinary production method without relying on the composition improving means such as an additive element. There is.
【０００５】[0005]
【課題を解決するための手段】発明者らは、添加元素等
の組成的手段に頼ることなく、通常の製造方法の改良に
よりフェライト磁石の磁気特性を向上させることを目的
に検討し、単磁区粒子径である１μｍ付近の結晶に粒度
分布を揃えることが重要であることに着目し、フェライ
ト磁石の製造工程を種々検討した結果、フェライト粉末
は仮焼反応あるいは水溶液法にて得られたフェライト生
成物をアトライターやボールミル等の機械的粉砕法によ
って得られるが、得られる粉末中には実際に目標とする
粒度よりもはるかに小さい微粉末や、十分に粉砕されて
いない粗粉末とが多く混在し、残存する粗粉末を微細化
するために、粉砕時間を延長する等の方法が採用されて
も、結果的には微粉末量が増加し、成形時のヒビ、割れ
の原因となり、また焼結時の異常粒成長の原因となり好
ましくないことより、仮焼反応、水溶液法により得られ
たフェライト生成物を機械的粉砕で０．２μｍ〜１．５
μｍの粉末に微粉砕した後、６００℃〜１１００℃に１
０分間〜１０時間の加熱処理を行い、その後、再度０．
２μｍ〜１．５μｍに微粉砕することにより、フェライ
ト粉末の粒度分布を均一化できることを知見し、この発
明を完成した。Means for Solving the Problems The inventors of the present invention have studied for the purpose of improving the magnetic properties of ferrite magnets by improving the ordinary manufacturing method without relying on the compositional means such as additive elements, and Focusing on the importance of matching the particle size distribution to the crystals around 1 μm, which is the particle size, various examinations were made on the manufacturing process of ferrite magnets, and as a result, ferrite powder was produced by the calcination reaction or the aqueous solution method. The product is obtained by a mechanical pulverization method such as an attritor or a ball mill, but the obtained powder contains a large amount of fine powder much smaller than the target particle size and coarse powder that has not been sufficiently pulverized. However, even if a method such as extending the crushing time is adopted in order to refine the remaining coarse powder, the amount of the fine powder will eventually increase, causing cracks and cracks during molding. More it is undesirable cause abnormal grain growth during sintering, calcination reaction, a ferrite product obtained by the aqueous solution method in mechanical grinding 0.2μm~1.5
After finely pulverizing to a powder of μm, 1 at 600 ℃ ~ 1100 ℃
The heat treatment is performed for 0 minutes to 10 hours, and then 0.
It was found that the particle size distribution of the ferrite powder can be made uniform by finely pulverizing it to 2 μm to 1.5 μm, and the present invention was completed.
【０００６】この発明は、ＭＯ・ｎＦｅ2Ｏ3（ＭはＳ
ｒ，Ｂａ，Ｐｂより選ばれる少なくとも１種の元素、ｎ
＝４．５〜６．５）の一般式にて表されるフェライト磁
石の製造方法において、仮焼反応あるいは水溶液法によ
り得られたフェライト生成物を機械的粉砕法にて平均粒
径０．２〜１．５μｍの粉末に粉砕した後、６００℃〜
１１００℃に１０分〜１０時間の加熱処理し、その後再
度、機械的粉砕法にて平均粒径０．２〜１．５μｍに粉
砕後、成形、焼結することを特徴とするフェライト磁石
の製造方法である。This invention is based on MO.nFe 2 O 3 (M is S
at least one element selected from r, Ba and Pb, n
= 4.5 to 6.5), a ferrite product obtained by a calcination reaction or an aqueous solution method is mechanically pulverized to obtain an average particle size of 0.2. ~ 600 ℃ ~ after crushing to ~ 1.5μm powder
Manufacture of a ferrite magnet characterized by being heat-treated at 1100 ° C. for 10 minutes to 10 hours, and then again pulverized by a mechanical pulverization method to an average particle size of 0.2 to 1.5 μm, followed by molding and sintering. Is the way.
【０００７】この発明における機械的粉砕法としては乾
式粉砕、湿式粉砕のいずれでもよく、アトライター法、
ボールミル法、スタンプミル法、マイクロナイザ法、ア
トマイズ法等公知の機械的粉砕法が採用され、必要によ
り複数回繰り返すことも可能であるが、作業性、経済性
等を考慮して、各条件を設定することが望ましい。The mechanical crushing method in the present invention may be either dry crushing or wet crushing, the attritor method,
Known mechanical crushing methods such as ball mill method, stamp mill method, micronizer method, atomizing method, etc. are adopted, and it is possible to repeat multiple times if necessary, but in consideration of workability, economic efficiency, etc., each condition It is desirable to set.
【０００８】また、この発明の加熱処理法は、０．５μ
ｍ以下の超部粉末を成長させることを目的とするもので
あるが、加熱処理温度が１１００℃を超えると粉末同志
が互いに焼結して緻密化するため、目的とする粒度分布
の均一化ができないので好ましくなく、また、６００℃
未満では目的とする超微粉末の成長が行われないので、
加熱温度は６００℃〜１１００℃に限定する。加熱時間
は加熱温度が低い場合は長時間を必要とし、また温度を
高くすると短時間で処理できることより、加熱温度に応
じて加熱時間を１０分〜１０時間の範囲より適宜選定す
る。The heat treatment method of the present invention is 0.5 μm.
The purpose is to grow super-part powders of m or less, but if the heat treatment temperature exceeds 1100 ° C., the powders will sinter each other and become densified, so that the target particle size distribution will be uniform. It is not preferable because it can not be done, and 600 ° C
If less than the target ultrafine powder is not grown,
The heating temperature is limited to 600 ° C to 1100 ° C. The heating time requires a long time when the heating temperature is low, and the processing can be performed in a short time when the heating temperature is high. Therefore, the heating time is appropriately selected from the range of 10 minutes to 10 hours according to the heating temperature.
【０００９】この発明において、成形法は乾式法でも湿
式法でもよいが、湿式成形法の方が磁場成形により微粉
末が磁場方向に配向しやすく、磁気特性の向上に有効で
あり、湿式成形法では水への微粉末の懸濁量は４０〜７
０％が好ましく、また磁場成形時の磁場は１０〜１５ｋ
Ｏｅ、成形圧は３００ｋｇ／ｃｍ2〜８００ｋｇ／ｃｍ2
が好ましい。In the present invention, the molding method may be a dry method or a wet method, but the wet molding method is more effective in improving the magnetic characteristics because the fine powder is more easily oriented in the magnetic field direction by the magnetic field molding, and the wet molding method is preferable. Then, the suspension amount of fine powder in water is 40 to 7
0% is preferable, and the magnetic field at the time of magnetic field molding is 10 to 15 k.
Oe, molding pressure is 300 kg / cm 2 to 800 kg / cm 2
Is preferred.
【００１０】[0010]
【作用】この発明の製造方法において、機械的粉砕法に
て得られたフェライト粉末は目標とする平均粒径１μｍ
の１／２以下の大きさを有する超微粉末と１．５μｍ以
上の粒径を有する粗粉末が混在しているが、これら粉末
を特定の加熱処理条件にて、加熱処理することにより、
微粉末が成長して、粒度分布は全体的に粒径の大きい方
へ変化して均一度が向上し、さらに加熱処理後の粉末を
再度粉砕すると、粗粉末が優先的に粉砕され、粒度分布
がより一層向上する作用効果を有し、その結果、得られ
た粉末を用いて焼結体を製造する場合、磁界中成形によ
り粒子を一方向に配合させると焼結体の配向度は向上
し、さらにフェライト結晶の粒径分布を約１μｍの単磁
区粒子径を最大頻度とする均一な分布に近づけることが
可能となり、磁気特性を向上する。In the manufacturing method of the present invention, the ferrite powder obtained by the mechanical grinding method has a target average particle size of 1 μm.
Although a superfine powder having a size of ½ or less and a coarse powder having a particle size of 1.5 μm or more are mixed, by subjecting these powders to heat treatment under specific heat treatment conditions,
The fine powder grows, and the particle size distribution changes to a larger particle size as a whole to improve the uniformity, and when the powder after heat treatment is crushed again, the coarse powder is crushed preferentially and the particle size distribution is increased. Has an effect of further improving, and as a result, when a sintered body is produced using the obtained powder, if the particles are mixed in one direction by magnetic field molding, the degree of orientation of the sintered body is improved. Further, it becomes possible to bring the particle size distribution of the ferrite crystal closer to a uniform distribution having the maximum frequency of the single domain particle size of about 1 μm, thereby improving the magnetic characteristics.
【００１１】[0011]
実施例１ Ｆｅ2Ｏ3／ＳｒＯモル比が５．９の基本組成を有する如
くフェライト原料粉末ＳｒＣＯ3 ７５ｇ、Ｆｅ2Ｏ3
４７０ｇを１２７０℃で１時間の仮焼反応により作製し
た。このフェライト原料粉末を８００ｇに水１ｌを加え
てアトライターにて平均粒径（空気透過法）が０．７μ
ｍになるまで微粉砕した。粉砕後のスラリーは脱水した
後、８００℃に１時間の加熱処理を行った。加熱処理後
の粉末平均粒径は１．２μｍであった。さらにこの粉末
５００ｇに所定量のＣａＯ、ＳｉＯ2、Ｃｒ2Ｏ3および
ＳｒＯを添加した後、水５００ｃｃを加えて再度ボール
ミルにて平均粒径が０．６５μｍまで粉砕した。そのと
きの粒度分布を図１に実線ａにて示す。このスラリーを
１２ｋＯｅの磁場中にて成形圧５００ｋｇ／ｃｍ2に
て、径４０×１０ｍｍ寸法の成形体を得た後、大気中で
１２４０℃、１時間の焼結条件にて焼結体を得た。得ら
れた焼結体の組成、密度、磁気特性を表１に表す。Example 1 Ferrite raw material powder SrCO 3 75 g, Fe 2 O 3 so as to have a basic composition of Fe 2 O 3 / SrO molar ratio of 5.9.
470 g was prepared by calcination reaction at 1270 ° C. for 1 hour. Water of 1 liter was added to 800 g of this ferrite raw material powder, and the average particle size (air permeation method) was 0.7 μm using an attritor.
Finely pulverized to m. The crushed slurry was dehydrated and then heat-treated at 800 ° C. for 1 hour. The average particle diameter of the powder after the heat treatment was 1.2 μm. Further, a predetermined amount of CaO, SiO 2 , Cr 2 O 3 and SrO was added to 500 g of this powder, 500 cc of water was added, and the mixture was pulverized again with a ball mill to an average particle size of 0.65 μm. The particle size distribution at that time is shown by a solid line a in FIG. This slurry was molded in a magnetic field of 12 kOe at a molding pressure of 500 kg / cm 2 to obtain a compact having a diameter of 40 × 10 mm, and then sintered at 1240 ° C. for 1 hour in the atmosphere to obtain a sintered compact. It was Table 1 shows the composition, density and magnetic properties of the obtained sintered body.
【００１２】実施例２ 実施例１と同一のフェライト原料粉末を乾式振動ミルに
て平均粒径が０．８μｍまで微粉砕した後、１０００℃
で３０分間の加熱処理を行い、加熱処理後の粉末の平均
粒径は１．３μｍであった。さらに、前記粉末に所定量
のＣａＯ、ＳｉＯ2、Ｃｒ2Ｏ3およびＳｒＯを添加後、
アトライターで平均粒径は０．７μｍまで微粉砕した
後、実施例１と同一の磁場中で湿式成形法焼結条件にて
焼結して、焼結体を得た。得られた焼結体の組成、密
度、磁気特性を表１に表す。Example 2 The same ferrite raw material powder as in Example 1 was finely pulverized by a dry vibration mill to an average particle size of 0.8 μm, and then 1000 ° C.
Was heated for 30 minutes, and the average particle size of the powder after the heat treatment was 1.3 μm. Furthermore, after adding a predetermined amount of CaO, SiO 2 , Cr 2 O 3 and SrO to the powder,
After finely pulverizing to an average particle size of 0.7 μm with an attritor, it was sintered in the same magnetic field as in Example 1 under the wet molding sintering conditions to obtain a sintered body. Table 1 shows the composition, density and magnetic properties of the obtained sintered body.
【００１３】実施例３ 実施例１のフェライト原料粉末に所定量のＣａＯ、Ｓｉ
Ｏ2、Ａｌ2Ｏ3を添加してボールミルにて平均粒径は
０．５μｍまで粉砕した。粉砕後のスラリーは脱水後、
６００℃に４時間の加熱処理を行った。加熱処理後の粉
末の平均粒径は１．２μｍであった。さらにこの粉末を
再びボールミルで０．７μｍまで粉砕し、実施例１と同
様の方法で焼結体を作製し、組成、密度、磁気特性を測
定した。その結果を表１に表す。Example 3 A predetermined amount of CaO and Si was added to the ferrite raw material powder of Example 1.
O 2 and Al 2 O 3 were added, and the mixture was pulverized with a ball mill to an average particle size of 0.5 μm. After the crushed slurry is dehydrated,
Heat treatment was performed at 600 ° C. for 4 hours. The average particle size of the powder after the heat treatment was 1.2 μm. Further, this powder was pulverized again with a ball mill to 0.7 μm, and a sintered body was prepared in the same manner as in Example 1, and the composition, density and magnetic characteristics were measured. The results are shown in Table 1.
【００１４】比較例１ 実施例１で作製したフェライト原料粉末に所定量のＣａ
Ｏ、ＳｉＯ2、Ｃｒ2Ｏ3およびＳｒＯを添加した後、ア
トライターで平均粒径は０．６５μｍとなるよう粉砕し
た。得られた微粉砕粉の粒度分布を図１に破線ｂで表
す。実施例１と同様に焼結体を作製した。得られた焼結
体の組成密度、磁気特性を測定してその結果を表１に示
した。Comparative Example 1 A predetermined amount of Ca was added to the ferrite raw material powder prepared in Example 1.
After adding O, SiO 2 , Cr 2 O 3 and SrO, the mixture was pulverized with an attritor so that the average particle diameter was 0.65 μm. The particle size distribution of the obtained finely pulverized powder is shown by the broken line b in FIG. A sintered body was prepared in the same manner as in Example 1. The composition density and magnetic properties of the obtained sintered body were measured, and the results are shown in Table 1.
【００１５】比較例２ 実施例１で作製したフェライト原料粉末を乾式振動ミル
にて平均粒径は０．８μｍまで粉砕し、この粉砕に所定
量のＣａＯ、ＳｉＯ2、Ｃｒ2Ｏ3およびＳｒＯを添加
後、アトライターで平均粒径は０．７μｍまで粉砕し、
実施例１と同様の方法で焼結体を作製した。得られた焼
結体の組成、密度、磁気特性を表１に示す。Comparative Example 2 The ferrite raw material powder prepared in Example 1 was pulverized by a dry vibration mill to an average particle size of 0.8 μm, and a predetermined amount of CaO, SiO 2 , Cr 2 O 3 and SrO was added to the pulverized powder. After addition, crush with an attritor to an average particle size of 0.7 μm,
A sintered body was produced in the same manner as in Example 1. Table 1 shows the composition, density and magnetic properties of the obtained sintered body.
【００１６】比較例３ 実施例１で作製したフェライト原料粉末に所定量のＣａ
Ｏ、ＳｉＯ2、Ａｌ2Ｏ3を添加してボールミルで０．７
μｍまで粉砕し、実施例１と同様に焼結体を作製した。
得られた焼結体の組成、密度、磁気特性を表１に示す。Comparative Example 3 A predetermined amount of Ca was added to the ferrite raw material powder prepared in Example 1.
Add O, SiO 2 and Al 2 O 3 to 0.7 with a ball mill.
The powder was pulverized to a size of μm, and a sintered body was produced in the same manner as in Example 1.
Table 1 shows the composition, density and magnetic properties of the obtained sintered body.
【００１７】[0017]
【表１】 [Table 1]
【００１８】図１に明らかなように、２段の微粉砕の間
に特定の加熱処理を施すことにより、フェライト結晶の
粒径分布を約１μｍの単磁区粒子径を最大頻度とする均
一な分布に近づけることが可能となり、実施例１と比較
例１との比較からも明らかなようにこの発明によるフェ
ライト磁石の磁気特性が向上していることが分かる。ま
た、表１に示す実施例２と比較例２、実施例３と比較例
との対比に明らかなように、この発明によるフェライト
磁石の磁気特性が向上していることが分かる。As is apparent from FIG. 1, by performing a specific heat treatment between the two stages of fine pulverization, the grain size distribution of the ferrite crystal is a uniform distribution with the single domain grain size of about 1 μm as the maximum frequency. It is possible to bring the magnetic properties of the ferrite magnet according to the present invention to be improved, as is clear from the comparison between Example 1 and Comparative Example 1. Further, as is clear from the comparison between Example 2 and Comparative Example 2 and Example 3 and Comparative Example shown in Table 1, it is understood that the magnetic characteristics of the ferrite magnet according to the present invention are improved.
【００１９】[0019]
【発明の効果】この発明による製造方法は、仮焼反応、
水溶液法により得られたフェライト生成物を機械的粉砕
で０．２μｍ〜１．５μｍの粉末に微粉砕した後、６０
０℃〜１１００℃に１０分間〜１０時間の加熱処理を行
い、その後、再度０．２μｍ〜１．５μｍに微粉砕する
ことにより、フェライト粉末の粒度分布を均一化、すな
わち、フェライト結晶の粒径分布を約１μｍの単磁区粒
子径を最大頻度とする均一な分布に近づけることが可能
となり、フェライト磁石の磁気特性を向上させることが
でき、公知の組成的な改善手段を併用すればさらに磁気
特性を向上させることができる。The manufacturing method according to the present invention comprises a calcination reaction,
The ferrite product obtained by the aqueous solution method was mechanically pulverized into powder of 0.2 μm to 1.5 μm, and then 60
Heat treatment is performed at 0 ° C. to 1100 ° C. for 10 minutes to 10 hours, and then finely pulverized again to 0.2 μm to 1.5 μm to make the particle size distribution of the ferrite powder uniform, that is, the particle size of the ferrite crystal. It is possible to make the distribution close to a uniform distribution in which the single domain particle diameter of about 1 μm is the maximum frequency, and it is possible to improve the magnetic characteristics of the ferrite magnet. Can be improved.
【図１】粒度分布を示すグラフである。FIG. 1 is a graph showing a particle size distribution.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 元根 隆博 佐賀県杵島郡大町町大字福母282番地 九 州住特電子株式会社内 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Takahiro Motone 282 Fukumo, Omachi-machi, Kishima-gun, Saga Prefecture Kyushu Sumidenshi Co., Ltd.
Claims (1)
ｂより選ばれる少なくとも１種の元素、ｎ＝４．５〜
６．５）の一般式にて表されるフェライト磁石の製造方
法において、仮焼反応あるいは水溶液法により得られた
フェライト生成物を機械的粉砕法にて平均粒径０．２〜
１．５μｍの粉末に粉砕した後、６００℃〜１１００℃
に１０分〜１０時間の加熱処理し、その後再度、機械的
粉砕法にて平均粒径０．２〜１．５μｍに粉砕後、成
形、焼結することを特徴とするフェライト磁石の製造方
法。1. MO.nFe 2 O 3 (M is Sr, Ba, P
at least one element selected from b, n = 4.5 to
In the method for producing a ferrite magnet represented by the general formula of 6.5), a ferrite product obtained by a calcination reaction or an aqueous solution method is mechanically pulverized to have an average particle diameter of 0.2 to
After pulverizing to a powder of 1.5 μm, 600 ° C to 1100 ° C
A heat treatment for 10 minutes to 10 hours, and then again pulverizing by a mechanical pulverization method to an average particle size of 0.2 to 1.5 μm, followed by molding and sintering, and a method for producing a ferrite magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5097191A JPH06290923A (en) | 1993-03-30 | 1993-03-30 | Manufacture of ferrite magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5097191A JPH06290923A (en) | 1993-03-30 | 1993-03-30 | Manufacture of ferrite magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06290923A true JPH06290923A (en) | 1994-10-18 |
Family
ID=14185696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5097191A Pending JPH06290923A (en) | 1993-03-30 | 1993-03-30 | Manufacture of ferrite magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06290923A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005073147A1 (en) * | 2004-01-28 | 2005-08-11 | Tdk Corporation | Method for producing ferrite sintered compact |
| JP2007123511A (en) * | 2005-10-27 | 2007-05-17 | Tdk Corp | Ferrite sintered magnet |
| US7713433B2 (en) | 2004-03-04 | 2010-05-11 | Tdk Corporation | Ferrite magnetic material and ferrite sintered magnet |
| JP2021052097A (en) * | 2019-09-25 | 2021-04-01 | Tdk株式会社 | Ferrite sintered magnet |
-
1993
- 1993-03-30 JP JP5097191A patent/JPH06290923A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005073147A1 (en) * | 2004-01-28 | 2005-08-11 | Tdk Corporation | Method for producing ferrite sintered compact |
| CN100436370C (en) * | 2004-01-28 | 2008-11-26 | Tdk株式会社 | Method for producing ferrite sintered body |
| US7713433B2 (en) | 2004-03-04 | 2010-05-11 | Tdk Corporation | Ferrite magnetic material and ferrite sintered magnet |
| JP2007123511A (en) * | 2005-10-27 | 2007-05-17 | Tdk Corp | Ferrite sintered magnet |
| JP2021052097A (en) * | 2019-09-25 | 2021-04-01 | Tdk株式会社 | Ferrite sintered magnet |
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