JPH01268001A - Hard ferrite powder for composite magnet - Google Patents
Hard ferrite powder for composite magnetInfo
- Publication number
- JPH01268001A JPH01268001A JP63096488A JP9648888A JPH01268001A JP H01268001 A JPH01268001 A JP H01268001A JP 63096488 A JP63096488 A JP 63096488A JP 9648888 A JP9648888 A JP 9648888A JP H01268001 A JPH01268001 A JP H01268001A
- Authority
- JP
- Japan
- Prior art keywords
- ferrite powder
- hard ferrite
- powder
- composite magnet
- composite
- 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
- 239000000843 powder Substances 0.000 title claims abstract description 55
- 239000002131 composite material Substances 0.000 title claims abstract description 28
- 229910001047 Hard ferrite Inorganic materials 0.000 title claims abstract description 25
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 6
- 150000003839 salts Chemical class 0.000 claims abstract description 6
- 229920000620 organic polymer Polymers 0.000 claims abstract description 4
- 239000002861 polymer material Substances 0.000 claims abstract description 3
- 239000002245 particle Substances 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 229910052745 lead Inorganic materials 0.000 abstract description 4
- 238000000465 moulding Methods 0.000 abstract description 2
- 239000002253 acid Substances 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 229910000859 α-Fe Inorganic materials 0.000 description 19
- 239000012535 impurity Substances 0.000 description 8
- 239000000654 additive Substances 0.000 description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 5
- 238000000137 annealing Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 3
- 235000013980 iron oxide Nutrition 0.000 description 3
- 239000006247 magnetic powder Substances 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- -1 polyethylene, ethylene copolymer Polymers 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 229930182556 Polyacetal Natural products 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- WPPDXAHGCGPUPK-UHFFFAOYSA-N red 2 Chemical compound C1=CC=CC=C1C(C1=CC=CC=C11)=C(C=2C=3C4=CC=C5C6=CC=C7C8=C(C=9C=CC=CC=9)C9=CC=CC=C9C(C=9C=CC=CC=9)=C8C8=CC=C(C6=C87)C(C=35)=CC=2)C4=C1C1=CC=CC=C1 WPPDXAHGCGPUPK-UHFFFAOYSA-N 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229910000018 strontium carbonate Inorganic materials 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はハードフェライト粉末と有機１合体材料を生体
とする複合磁石に用いられるノーードフェライト粉末に
関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a nodal ferrite powder used in a composite magnet having a hard ferrite powder and an organic monomer composite material as its living body.
近年、電子機外用磁石の小型＠量化あるいは形状複雑化
の要求に伴ない、ｇｌ磁性粉末を合成樹脂等の有機１合
体で結合した複合磁石が注目され、広く実用に供される
ようになった。特に１０Ｉ＋格および製造の容易さの点
からハードフェライト粉末を用いたフェライト系複合磁
石が多用されている。In recent years, with the demand for smaller magnets for external use in electronic equipment and more complex shapes, composite magnets in which GL magnetic powder is combined with organic monomers such as synthetic resins have attracted attention and are now widely put into practical use. . In particular, ferrite composite magnets using hard ferrite powder are often used because of their 10I+ rating and ease of manufacture.
複合磁石用のハードフェライト粉末は粉末状態で十分な
磁石特性を具備する必要があり、該粉末の有機東金体中
への分散性、濡れ性、充填性吟を反映した混線性および
磁場中射出成形時の混練物の成形性、配向性等および前
述の工程を経て製造される複合磁石の磁気特性は密接に
ハードフェライト粉末の粉体特性に依存する。複合磁石
用のハードフェライト粉末は前述の如く粉末状態で十分
な磁気特性を備えることが必須条件である。そのために
通常焼結フェライト磁石で行なう焼結処理は実施されず
、複合磁石用のハードフェライト粉末の場合は、粉末状
態を維持したまま十分な磁気特性を付与する焼鈍処理（
例えは特開昭５４−１４３８９３４参照）が行なわれる
。したがって焼結工程後の磁気特性が評価される焼結フ
ェライト磁石と、粉末集合体としての磁気特性が評価さ
れるり合磁石用のハードフェライト粉末とでは添加物の
＆類および添加量、許容される不純物の８類および含有
１に郷が異なると予想される。Hard ferrite powder for composite magnets must have sufficient magnetic properties in the powder state, and cross-talk and injection molding in a magnetic field reflect the dispersibility, wettability, and filling properties of the powder in the organic Togane body. The moldability, orientation, etc. of the kneaded product at the time and the magnetic properties of the composite magnet produced through the above-mentioned steps closely depend on the powder properties of the hard ferrite powder. As mentioned above, it is essential that the hard ferrite powder for the composite magnet has sufficient magnetic properties in the powder state. For this reason, the sintering treatment normally performed on sintered ferrite magnets is not performed, and in the case of hard ferrite powder for composite magnets, annealing treatment is applied to impart sufficient magnetic properties while maintaining the powder state.
For example, see Japanese Patent Laid-Open No. 54-1438934). Therefore, for sintered ferrite magnets, whose magnetic properties are evaluated after the sintering process, and hard ferrite powders for bonded magnets, whose magnetic properties as a powder aggregate are evaluated, the types and amounts of additives are acceptable. It is expected that the impurity class 8 and content 1 will differ depending on the type of impurity.
しかるに、従来の発明においては両者を峻別したものは
なく、焼結磁石に胸する発明をそのまま複合磁石用に用
いるのが通常だった。However, in the conventional inventions, there was no clear distinction between the two, and it was usual that inventions related to sintered magnets were used as they were for composite magnets.
すなわち、焼結フェライト磁石の添加物、不純物につい
ては多数の発明がある。例えは、特公昭４６−２４８３
４に０．００２〜０．２１量部の塩素の存在下で５ｉｎ
ｓ ＊ Ｔ１（ｈ ＊ Ｃｒ＊Ｏｓ ＃ ＡｊｇＯｓ
ｅ ＺｒＯｓのうちの１棟以上を０．１〜１．０重量部
添加すると高磁気特性が得られると記載されている。ま
た使用原料の不純物に関する刊行物も多い（例えは、山
道ら：「粉体及び粉末冶金Ｊ ２ｌ−７（１９７４））
。That is, there are many inventions regarding additives and impurities for sintered ferrite magnets. For example, Tokuko Sho 46-2483
4 in the presence of 0.002 to 0.21 parts of chlorine.
s*T1(h*Cr*Os#AjgOs
It is stated that high magnetic properties can be obtained by adding 0.1 to 1.0 parts by weight of one or more of e ZrOs. There are also many publications regarding impurities in the raw materials used (for example, Yamado et al.: "Powders and Powder Metallurgy J 2l-7 (1974)").
.
焼結フェライト磁石においてはＳｔ Ｏｓ ｅ Ｃａ
Ｃｏｔ等の焼結性に寄与する添加物を一時に添加するこ
とが必須条件である点で、複合磁石用のハードフェライ
ト粉末と焼結７エライ）ｆｆ１石とでは添加物の楕類、
添加量および許容される不純物のＡｌ類と含有量が異な
る。In sintered ferrite magnets, St Os e Ca
In that it is essential to add additives that contribute to sinterability such as Cot at the same time, hard ferrite powder for composite magnets and sintered 7elai) ff1 stone are different from additives such as ellipsoids,
The amount added and the content of Al as permissible impurities are different.
他方、複合磁石用のハードフェライト粉末に関して製造
方法及び各裡粉体物注等を記述した発明（例えｆｆ：、
特公昭５８−４１６４６．％公昭５８−２７２１２号癖
照）が為されているが、添加物および不純物についての
記載に乏しく、刊行物（例えば渡辺ら：「粉体及び粉末
冶金Ｊ ２０ （１９７３） 、 １２６及び２１（１
９７４） 、 ２００ ）にも記載は乏しい。On the other hand, an invention describing a manufacturing method and various powder notes regarding hard ferrite powder for composite magnets (for example, ff:,
Tokuko Sho 58-41646. However, there is a lack of description of additives and impurities, and publications such as Watanabe et al., "Powder and Powder Metallurgy J 20 (1973), 126 and 21 (1973),
974), 200) also have scant descriptions.
これは従来の複合磁石用ハードフェライト粉末に関す発
明が不十分だったことを物語るものである０
〔発明が解決しようとする問題点〕
従来の複合磁石用ハードフェライト粉末は、磁場中射出
成形時の配向性が悪く、また得られる複合磁石の磁気特
性のバラツキも大きかった。This proves that the conventional invention regarding hard ferrite powder for composite magnets was insufficient.0 [Problems to be solved by the invention] Conventional hard ferrite powder for composite magnets does not work well during injection molding in a magnetic field. The orientation of the composite magnets was poor, and the magnetic properties of the resulting composite magnets varied widely.
したがって、本発明の目的は、上述した従来技術の問題
点を解消し、印加磁界における配向性が良好で良好な磁
気特性を有する複合磁石が得られるハードフェライト粉
末を提供することである。Therefore, an object of the present invention is to provide a hard ferrite powder that solves the problems of the prior art described above and provides a composite magnet with good orientation in an applied magnetic field and good magnetic properties.
本発明は、ハードフェライト粉末と有機重合体材料とを
生体としてＴｈｇされる混練物を所定の圧力および温度
において所定形状に有する金型空間内に磁場中射出成形
する異方性複合磁石に用いられる複合磁石用ハードフェ
ライト粉末において、Ｍｏ−ｎＦｅ＊ｏｓ （ＭはＢａ
ｔ Ｓｒ 、Ｐｂよ９選はれる少なくとも一部の元素
を表わし、ｎは４．８〜６．２の範囲にある。）の一般
式で表わされ、微量のＡｌと０を含有し、平均粒子径が
０．５〜６．０μｍ（空気透過法）であり、含有される
Ｃｒの一部がＣｒ酸塩（Ｃｒ”）を形屓していることを
特徴とする轡合磁石用／’１−ドアエライト粉末である
。The present invention is used for an anisotropic composite magnet in which a kneaded mixture of hard ferrite powder and an organic polymer material, which is Thg as a living body, is injection molded in a magnetic field into a mold space having a predetermined shape at a predetermined pressure and temperature. In hard ferrite powder for composite magnets, Mon-Fe*os (M is Ba
t Sr represents at least a part of elements selected from Pb, and n is in the range of 4.8 to 6.2. ), contains trace amounts of Al and 0, has an average particle diameter of 0.5 to 6.0 μm (air permeation method), and a part of the Cr contained is Cr salt (Cr This is a 1-door elite powder for use in joint magnets, which is characterized by having the following shape:
また、本発明においては含有されるＭとＣｒの総和が１
０〜５ 、 ＯＤＯｐＰｍであり、かつＡｌ又はＣｒが
１ ｐｐｍ以上含有されることを特徴とする。Furthermore, in the present invention, the sum of M and Cr contained is 1
0 to 5, ODOpPm, and contains 1 ppm or more of Al or Cr.
本発明においては、特にフェライト粉末に含有されるＣ
ｒの一部がＣｒ酸塩（Ｃｒ′＋）を形成していることお
よび含有されるＡｌとＣｒの含有量の総和が１０〜５．
ＯＯＯＰｐｍで１、かつＡｌ又はＣｒが１ ｐｐｍ以上
含有されることによりて効果が発揮される。In the present invention, C contained in ferrite powder is particularly important.
Part of r forms Cr salt (Cr'+) and the total content of Al and Cr is 10 to 5.
The effect is exhibited by containing OOOPpm of 1 and Al or Cr of 1 ppm or more.
本発Ｆ！Ａにおいて使用されるハードフェライト粉末（
以下単にフェライト粉末という）はＭＣ１ｎＦｅｚ Ｏ
ｓ （但し、Ｍ ＦｉＳｒ 、 Ｂａ 、 Ｐｂの内の
１徨以上）の一般式で表わされるが、モル比ｎの範囲は
、マグネトプラムバイト相が安定である４、８〜６．２
が適当である。またフェライト粉末の平均粒径（但し空
気透過法で測定した値とする）は、０．５μｍ未満であ
ると、混線時にフェライト粉末を充填する量が減少し、
３．０μｍを越えるとフェライト粉末の固有保磁力（ｉ
Ｈｃ）の低下が顕著となるので、０．５〜３．０μｍ（
好ましくは０．８〜１．５μｍ）の範囲とされる。なお
、ＡｌとＣｒ以外で焼結フェライト磁石に添加物として
多用される８１ ｅ Ｂｉ ｒ Ｐｂ 、 Ｔｉ ｅＺ
ｒ＊Ｃａ、Ｖ、Ｍｎ、Ｎｉ ＋Ｃｕ、ＣｏｔＹ２Ｍｇ＊
Ｚｎ、Ｌｉ ＋Ｌａ ｔＰｒ ｔ Ｎｄ ｅ Ｂ 、
Ａ＋ｓ ＊ Ｓｂ ｔ Ｃｄ 、 Ｇｅ ＊ Ｃｅ
ｔ Ｎａ ｅ Ｋ 、 Ｓｎ ｔＣｓ＊Ｍｏ＊ＷｅＮ
ｂ、Ｇａ、ＩｎｔＴｈｔＳ等の′単独もしくは２ａ１以
上の元素を含む化合物を１３！！：ｉｔ％程度まで含有
できるが極力含有量を低くする事が望ましい。Original F! Hard ferrite powder used in A (
(hereinafter simply referred to as ferrite powder) is MC1nFez O
It is represented by the general formula of s (However, one or more of MFiSr, Ba, Pb), and the range of molar ratio n is 4, 8 to 6.2 in which the magnetoplumbite phase is stable.
is appropriate. In addition, if the average particle size of the ferrite powder (measured by the air permeation method) is less than 0.5 μm, the amount of ferrite powder to be filled during crosstalk will decrease.
If it exceeds 3.0 μm, the intrinsic coercive force (i
0.5 to 3.0 μm (
It is preferably in the range of 0.8 to 1.5 μm). In addition to Al and Cr, 81eBirPb and TieZ, which are often used as additives in sintered ferrite magnets, are
r*Ca, V, Mn, Ni +Cu, CotY2Mg*
Zn, Li + La tPr t Nd e B ,
A+s * Sb t Cd , Ge * Ce
tNaeK, Sn tCs*Mo*WeN
13! Compounds containing elements such as b, Ga, IntThtS, etc. alone or 2a1 or more! ! :Although it can be contained up to about it%, it is desirable to keep the content as low as possible.
そして、不可避の不純物は合計で１ｗｔ％までに抑える
必要がるる。In addition, it is necessary to suppress unavoidable impurities to a total of 1 wt%.
本発明において、含有されるＣｒの一部がＣｒ酸塩（Ｃ
ｒ”）を形成していることが必須である□ Ｃｒ酸塩（
Ｃｒ”）の形成が珠母力（ｉＨｃ）に効果があるからで
ある。In the present invention, part of the Cr contained is Cr salt (C
□ Cr salt (
This is because the formation of Cr") has an effect on the intermolecular force (iHc).
また本発明において、Ａｌ ｈ Ｃｒの総和が１０ｐＰ
ｍ禾満のときはｉＨｃ向上が十分でなく、５０００ｐｐ
ｍを越えるときはＢｒ ｌ ｔＨｃの低下が顕著で角形
性の悪化を来たして好ましくない。またＡｌとＣｒは複
合添加することが必要であり総和で１０〜５０００ｐｐ
ｍ添加するが、Ａｌ又はＣｒは１ ｐｐｍ以上必ず浩加
することが本発明には必須である。Further, in the present invention, the total amount of Al h Cr is 10 pP
When I am full, iHc improvement is not enough and 5000pp
When it exceeds m, the decrease in Br l tHc is significant and the squareness deteriorates, which is not preferable. Also, it is necessary to add Al and Cr in combination, and the total amount is 10 to 5000 pp.
However, it is essential to the present invention that Al or Cr be added in an amount of 1 ppm or more.
本発明のフェライト粉末は、例えば粉砕法によって製造
される。まず所定組成となるように各原料を配合し、１
０００〜１６５０℃の温度で仮焼してフェライト化反応
を行なう０得られた反応生成物は、粗粉砕、微粉枠抜焼
鈍される０焼鈍条件は、目標とする７エライト粉末のｉ
Ｈｃによって設定されるが、焼鈍温度８００〜９５０℃
、保持時間３０分〜４時間の条件が望ましい０次に、磁
粉のｔＨｃが目標値以下にならない範囲内で前記焼鈍粉
末をアトマイザ−、ミキサー、ミル等で乾式解砕するか
、あるいは水、アルコール等の助剤の共存下で湿式解砕
後、乾燥して焼鈍処理によって生じた軽度の焼結を解消
せしめ、該粉末の配向性を同上させる。前記解砕処理の
程度は目標とするｉＨｃにより焼鈍条杆と相関させて適
宜決定すれは良い。The ferrite powder of the present invention is produced, for example, by a pulverization method. First, each raw material is blended to have a predetermined composition, and 1
The ferrite reaction is carried out by calcining at a temperature of 000 to 1650°C.The resulting reaction product is coarsely pulverized and then annealed to form a fine powder.The annealing conditions are as follows:
Although set by Hc, annealing temperature 800-950℃
, a holding time of 30 minutes to 4 hours is preferable.Next, the annealed powder is dry-pulverized using an atomizer, mixer, mill, etc. within a range where the tHc of the magnetic powder does not fall below the target value, or the annealed powder is crushed using water, alcohol, etc. After wet crushing in the presence of an auxiliary agent such as, the powder is dried to eliminate slight sintering caused by the annealing treatment and to improve the orientation of the powder. The extent of the crushing treatment may be determined as appropriate in relation to the target iHc and the annealed rod.
本発明によりて得られたフェライト粉末を用いて、例え
は次のようにして初台磁石を製造することができる。Using the ferrite powder obtained according to the present invention, a starter magnet can be manufactured, for example, in the following manner.
まず原料としてフェライト粉末の他に、ポリアミド樹脂
、ポリエチレン、エチレン共重合体、ポリスチレン、ポ
リアセタール、ポリフェリンサルファイド、ポリブチレ
ンテレフタレート、ポリエーテルエーテルケトン等の熱
可塑性樹肪あるいは天然又は合成ゴムなどの公知の有機
重合体を準備する。このほかに、公知の可塑剤、加硫剤
、滑剤、表面改質剤、酸化防止剤および熱安定剤の１種
又は２種以上を少量（数′Ｍ量チー以下用いてもよい０
次に前記各原料を十分に混合し、次いで加熱混紳後ペレ
タイジングしてコンパウンドを製造する０ここでフェラ
イト粉末と１ｒ曾体との配合比は、磁気特性や成形性を
考慮して定められるが、−標に５０〜９５′に量％：５
０〜５！ｔ％（好ましくは８０〜９０ｉｕｉ％：２０〜
１０ｍｔ％）の範凹とされる０以後、前記コンパウンド
を磁場中射出成形して異方性複合磁石が得られる。First, in addition to ferrite powder, the raw materials include thermoplastic resins such as polyamide resin, polyethylene, ethylene copolymer, polystyrene, polyacetal, polyferrine sulfide, polybutylene terephthalate, polyether ether ketone, and known materials such as natural or synthetic rubber. Prepare an organic polymer. In addition, one or more of known plasticizers, vulcanizing agents, lubricants, surface modifiers, antioxidants, and heat stabilizers may be added in small amounts (several M amounts or less may be used). The above-mentioned raw materials are thoroughly mixed, then heated and mixed, and then pelletized to produce a compound. Here, the blending ratio of ferrite powder and 1r mass is determined by taking into account magnetic properties and moldability, but - Amount %: 5 to 50 to 95'
0-5! t% (preferably 80-90iui%: 20-
10 mt%), the compound is injection molded in a magnetic field to obtain an anisotropic composite magnet.
以下に実施例および比較例を挙けて本発明をより具体的
に説明する０
実施例１
表−１，実施例１の酸化鉄と炭酸ストロンチウム（Ａｌ
＝ ２ ｐｐｍ 、 Ｃｒ” ＝ ２ ｐｐｍ 、 Ｃ
ｒ” ＝ Ｔｒ ）とをモル比５．８となるように配合
後ヘシ・ンエルミキサーで３０分間混合した。次いでロ
ータリーキルンにて１２００℃Ｘ２Ｈの仮焼を行なって
フェライトクリンカーを作成した。これをジ璽−クラッ
シャーで粗砕後、ボールミルにて粗粉砕し、引続いて振
動篩により１５０メツシエ以下に篩った。次にアトライ
タにて平均粒子径１．０５μｍに湿式微粉砕した。乾燥
後アトマイザ−にて乾式解砕し、続いて電気炉で７５０
℃×３時間、８８０℃×３時間。The present invention will be described in more detail with reference to Examples and Comparative Examples.0 Example 1 Iron oxide and strontium carbonate (Al
= 2 ppm, Cr" = 2 ppm, C
r'' = Tr) at a molar ratio of 5.8 and mixed for 30 minutes in a hexane mixer. Next, calcination was performed at 1200°C for 2 hours in a rotary kiln to create a ferrite clinker. After coarsely crushing with a jig crusher, coarsely crushing with a ball mill, and then sieving with a vibrating sieve to a particle size of 150 mesh or less.Next, wet pulverization with an attritor to an average particle size of 1.05 μm.After drying, use an atomizer. - Dry crushing at -, followed by electric furnace for 750
℃×3 hours, 880℃×3 hours.
９１０℃×５時間の焼鈍を行なった０これをアトマイサ
ーで解砕してフェライト微粉末を得た０該粉末の固有保
磁力（ｉＨｃ）および印加磁界４ＫＯｅにおける磁化（
（Ｆ４ＫＯｅ）をＢ−Ｈ）レーサー（埋伏電子製）にて
測定した〇一方、ＪＩＳＫＯ１０２に基づいて焼鈍・無
砕粉を６０．０００Ｏｒ秤堆後２００．００１の蒸留水
に浸漬せしめＣｒ’＋を溶出させて、該溶液内に存在す
るＣｒ’＋濃度を測定した。また焼鈍・解砕粉のＡｌ、
総、Ｃｒ （Ｃｒ”＋Ｃｒ” ）含有量をＩＣＰ（第二
稍工舎製）により測定した０次に焼鈍・解砕粉末をヘン
シェルミキサーで攪拌しながらアミフシ２ン（ＫＢＭ−
６０３信越化学共）を０．２５重量％（対磁粉）添加後
８０℃×３時間乾燥して表面処理した。表面処理された
フェライ°ト粉末８９．５重１＊に１２ナイロン（Ｐ−
３０１４Ｕ宇部興産裂）１０．５３！ｆ％とステアリン
酸アミド（ＡＰ−１日本化成製）を１．０３１＃％（対
１２ナイロン）加えて加圧加熱型ニーダ−にて２４０℃
×１時間混練した。この混線物を冷却同化後ベレット状
（３〜５■角）に粉砕してコンパウンドを作成した。こ
れを射出成形機に投入し、射出温度２８０℃、成形圧力
１００１００Ｏ１にて磁気回路付金型（空隙磁束密度４
０００Ｇ）Ｋ射出成形した。得られた成形体の寸法（ｗ
）は１０Ｘ１０Ｘ１０であり、この試料にて磁気特性を
測定・評価した。The powder was annealed at 910°C for 5 hours and then crushed with an atomizer to obtain fine ferrite powder.The intrinsic coercive force (iHc) of the powder and the magnetization (
Cr'+ was eluted and the concentration of Cr'+ present in the solution was measured. Also, Al of annealing and crushed powder,
The total Cr (Cr"+Cr") content was measured by ICP (manufactured by Dainikenkosha). The zero-order annealed and crushed powder was mixed with Amifushi 2 (KBM-2) while stirring with a Henschel mixer.
603 (Shin-Etsu Chemical Co., Ltd.) was added thereto in an amount of 0.25% by weight (to magnetic powder), and then dried at 80° C. for 3 hours to perform surface treatment. Surface-treated ferrite powder 89.5 weight 1* 12 nylon (P-
3014U Ube Industries) 10.53! f% and stearic acid amide (AP-1 manufactured by Nippon Kasei) were added at 1.031 #% (vs. 12 nylon) and heated at 240°C in a pressure heating type kneader.
The mixture was kneaded for 1 hour. This mixture was cooled and assimilated and then ground into pellets (3 to 5 squares) to prepare a compound. This was put into an injection molding machine, and the injection temperature was 280℃ and the molding pressure was 100,100O1.
000G)K injection molded. Dimensions of the obtained molded body (w
) was 10×10×10, and the magnetic properties were measured and evaluated using this sample.
実施例２〜５
表−１のＡｌ１Ｃｒ含有量の異なる原料酸化鉄を使用し
た以外は実施例１と同様の測定・評価を行なった０
表−３に実施例１から実施例５の結果を示す〇ま九赤−
２には本発明におけるハードフェライト粉末の不可避不
純物成分の含有例を示す。Examples 2 to 5 The same measurements and evaluations as in Example 1 were performed except that raw iron oxides with different Al1Cr contents in Table 1 were used. Table 3 shows the results of Examples 1 to 5. 〇ma nine red-
2 shows an example of the inclusion of inevitable impurity components in the hard ferrite powder in the present invention.
表−１原料酸化鉄のｇ、Ｃｒ含有景
表−２不可避不純物成分の含有例
〔発明の効果〕
本発明によればφ結磁石を粉砕して磁粉とする従来の複
合磁石に比べて、はるかに保磁力が高い複合磁石に好適
のハードフェライト粉末が得られる０Table 1: g and Cr content of raw material iron oxide Hard ferrite powder suitable for composite magnets with high coercive force can be obtained.
Claims (1)
として構成される混練物を所定の圧力および温度におい
て所定形状を有する金型空間内に磁場中射出成形する異
方性複合磁石に用いられる複合磁石用ハードフェライト
粉末において、Ｍｏ・ｎＦｅ＿２Ｏ＿３（ＭはＢａ，Ｓ
ｒ，Ｐｂより選ばれる少なくとも一種の元素を表わし、
ｎは４．８〜６．２の範囲にある。）の一般式で表わさ
れ、微量のＡｌとＣｒを含有し、平均粒子径が０．５〜
３．０μｍ（空気透過法）であり、含有されるＣｒの一
部がＣｒ酸塩（Ｃｒ＾６＾＋）を形成していることを特
徴とする複合磁石用ハードフェライト粉末。 （ｉｉ）含有されるＡｌとＣｒの総和が１０〜５，００
０ｐｐｍであり、かつＡｌ又はＣｒが１ｐｐｍ以上含有
されることを特徴とする請求項（１）に記載の複合磁石
用ハードフェライト粉末。[Claims] (i) Anisotropy in which a kneaded material mainly composed of hard ferrite powder and an organic polymer material is injection molded in a magnetic field in a mold space having a predetermined shape at a predetermined pressure and temperature. In the hard ferrite powder for composite magnets used in composite magnets, Mo・nFe_2O_3 (M is Ba, S
represents at least one element selected from r, Pb,
n is in the range of 4.8 to 6.2. ), contains trace amounts of Al and Cr, and has an average particle diameter of 0.5 to
A hard ferrite powder for a composite magnet, which has a particle size of 3.0 μm (air permeation method) and is characterized in that a part of the Cr contained forms a Cr salt (Cr^6^+). (ii) The total amount of Al and Cr contained is 10 to 5,000
The hard ferrite powder for a composite magnet according to claim 1, wherein the hard ferrite powder is 0 ppm and contains 1 ppm or more of Al or Cr.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63096488A JP2967827B2 (en) | 1988-04-19 | 1988-04-19 | Hard ferrite powder for composite magnet, compound using the same, and composite magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63096488A JP2967827B2 (en) | 1988-04-19 | 1988-04-19 | Hard ferrite powder for composite magnet, compound using the same, and composite magnet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01268001A true JPH01268001A (en) | 1989-10-25 |
| JP2967827B2 JP2967827B2 (en) | 1999-10-25 |
Family
ID=14166460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63096488A Expired - Lifetime JP2967827B2 (en) | 1988-04-19 | 1988-04-19 | Hard ferrite powder for composite magnet, compound using the same, and composite magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2967827B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007113973A1 (en) * | 2006-03-31 | 2007-10-11 | Dowa Electronics Materials Co., Ltd. | Ferrite magnetic powder for bonded magnets, process for production thereof, and bonded magnets |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51146390A (en) * | 1975-06-12 | 1976-12-15 | Toyo Soda Mfg Co Ltd | Process for production of chromium sesquioxide |
| JPS60176204A (en) * | 1984-02-22 | 1985-09-10 | Hitachi Metals Ltd | Manufacture of compound magnet |
| JPS6358804A (en) * | 1986-08-29 | 1988-03-14 | Hitachi Metals Ltd | Oxide permanent magnet |
-
1988
- 1988-04-19 JP JP63096488A patent/JP2967827B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51146390A (en) * | 1975-06-12 | 1976-12-15 | Toyo Soda Mfg Co Ltd | Process for production of chromium sesquioxide |
| JPS60176204A (en) * | 1984-02-22 | 1985-09-10 | Hitachi Metals Ltd | Manufacture of compound magnet |
| JPS6358804A (en) * | 1986-08-29 | 1988-03-14 | Hitachi Metals Ltd | Oxide permanent magnet |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007113973A1 (en) * | 2006-03-31 | 2007-10-11 | Dowa Electronics Materials Co., Ltd. | Ferrite magnetic powder for bonded magnets, process for production thereof, and bonded magnets |
| JP2007294871A (en) * | 2006-03-31 | 2007-11-08 | Dowa Electronics Materials Co Ltd | Ferrite magnetic powder for bond magnet, its manufacturing method, and bond magnet |
| EP2003657A2 (en) * | 2006-03-31 | 2008-12-17 | DOWA Electronics Materials Co., Ltd. | Ferrite magnetic powder for bonded magnets, process for production thereof, and bonded magnets |
| EP2003657A4 (en) * | 2006-03-31 | 2010-07-28 | Dowa Electronics Materials Co | Ferrite magnetic powder for bonded magnets, process for production thereof, and bonded magnets |
| US20100230630A1 (en) * | 2006-03-31 | 2010-09-16 | Dowa F-Tec Co., Ltd. | Ferrite Magnetic Powder for Bond Magnet and Manufacturing Method of the Same, and Bond Magnet |
| US9460850B2 (en) | 2006-03-31 | 2016-10-04 | Dowa F-Tec Co., Ltd. | Ferrite magnetic powder for bond magnet and manufacturing method of the same, and bond magnet |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2967827B2 (en) | 1999-10-25 |
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