JPH03292702A - Plastic bonded magnet - Google Patents
Plastic bonded magnetInfo
- Publication number
- JPH03292702A JPH03292702A JP9386490A JP9386490A JPH03292702A JP H03292702 A JPH03292702 A JP H03292702A JP 9386490 A JP9386490 A JP 9386490A JP 9386490 A JP9386490 A JP 9386490A JP H03292702 A JPH03292702 A JP H03292702A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic powder
- magnetic
- crystal
- mixed
- powder
- 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
- 239000004033 plastic Substances 0.000 title claims description 11
- 239000006247 magnetic powder Substances 0.000 claims abstract description 37
- 239000013078 crystal Substances 0.000 claims abstract description 24
- 239000008188 pellet Substances 0.000 claims abstract description 6
- 229920005989 resin Polymers 0.000 claims abstract description 6
- 239000011347 resin Substances 0.000 claims abstract description 6
- 239000004014 plasticizer Substances 0.000 claims abstract description 4
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 4
- 229920001187 thermosetting polymer Polymers 0.000 claims abstract description 4
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract 2
- 239000007822 coupling agent Substances 0.000 claims abstract 2
- 229910052719 titanium Inorganic materials 0.000 claims abstract 2
- 239000010936 titanium Substances 0.000 claims abstract 2
- 229910000859 α-Fe Inorganic materials 0.000 claims description 12
- 229910052712 strontium Inorganic materials 0.000 claims description 5
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims description 5
- 239000006082 mold release agent Substances 0.000 claims description 4
- 238000004381 surface treatment Methods 0.000 claims description 3
- 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 claims description 2
- 239000000843 powder Substances 0.000 claims 2
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 21
- 239000000463 material Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000006249 magnetic particle Substances 0.000 description 15
- 230000004907 flux Effects 0.000 description 9
- 238000001746 injection moulding Methods 0.000 description 3
- 238000011888 autopsy Methods 0.000 description 2
- 238000000748 compression moulding Methods 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 229910001047 Hard ferrite Inorganic materials 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002224 dissection Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000012756 surface treatment agent Substances 0.000 description 1
Landscapes
- Hard Magnetic Materials (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、従来のハードフェライトの磁粉の形状の改良
及び３種類の大きさの異なる磁粉の組合わせにより２従
来のフェライトプラスチック磁石には見られない高残留
磁束密度を持たせたプラスチック磁石の提案に関する。Detailed Description of the Invention [Industrial Application Field] The present invention achieves improvements in the shape of conventional hard ferrite magnetic particles and a combination of three types of magnetic particles of different sizes. This paper relates to a proposal for a plastic magnet that has a high residual magnetic flux density that cannot be used.
［従来の技術］
従来、ストロンチュムフェライトを少量の可塑肥、ｌｌ
Ｉ型剖を加して ＳＩＩ脂とともに混練した後このペレ
ットを用いて、磁場中で射出成形、または磁場中で圧縮
成形することにより、フェライトプラスチックボンデッ
ト磁石を加工していた。[Prior art] Conventionally, strontium ferrite was used as a small amount of plastic fertilizer.
After adding Type I dissection and kneading with SII fat, the pellets were used to process ferrite plastic bonded magnets by injection molding in a magnetic field or compression molding in a magnetic field.
しかし、従来の段階では、その磁気特性である残留磁束
密度は、１，７００Ｇａｕｓｓ１ 、８００Ｇａｕｓｓ
が最高値で、これ以上特性の改良が困難であった。However, in the conventional stage, the residual magnetic flux density, which is the magnetic property, is 1,700 Gauss1, 800 Gauss
was the highest value, and it was difficult to further improve the characteristics.
また、この残留磁束密度をフェライト焼結磁石の残留磁
束密度に近づけるため、上記フェライトプラスチックボ
ンデット磁石を成形加工後、樹脂を蒸発させ、フェライ
ト焼結磁石の組織構造に近づける方法が取られた。Furthermore, in order to make this residual magnetic flux density close to that of a sintered ferrite magnet, a method was adopted in which the resin was evaporated after the ferrite plastic bonded magnet was molded to make the structure similar to that of a sintered ferrite magnet.
しかし、このように樹脂を蒸発させることにより、機械
強度が低下し、フェライト焼結磁石より脆くなる結果と
なっていた。However, by evaporating the resin in this way, the mechanical strength decreases, resulting in a magnet that is more brittle than a sintered ferrite magnet.
［発明が解決しようとする問題点］
上述のように従来は、フェライトプラスチックボンデッ
ト磁石の残留磁束密度を向上させる方法には、磁気七能
、機械的性能がよく、安定して生産できるものがなかっ
た。[Problems to be Solved by the Invention] As mentioned above, conventional methods for improving the residual magnetic flux density of ferrite plastic bonded magnets have been limited to those that have good magnetic performance, good mechanical performance, and can be produced stably. There wasn't.
そこで、磁粉単体の結晶異方性と形状異方性の双方の効
果を利用することにより、磁気特性を向上させ、機械的
には、従来のプラスチックボンデット磁石と同等のもの
にするため、磁粉の充填率を従来と変えないものを提供
することある。Therefore, by utilizing the effects of both the crystal anisotropy and shape anisotropy of a single magnetic powder, we improved the magnetic properties and made it mechanically equivalent to conventional plastic bonded magnets. The goal is to provide a product with the same filling rate as before.
［問題を解決するための手段及び作用］その解決手段と
して、磁粉の磁気特性向上のために、結晶異方性効果と
形状異方性効果とを最大限に利用することにある。[Means and effects for solving the problem] The solution is to make maximum use of the crystal anisotropy effect and the shape anisotropy effect in order to improve the magnetic properties of the magnetic powder.
すなわち、ストロンチュムフェライト磁粉またはバリウ
ムフェライトの磁粉の結晶軸（Ｃｍ）方向に結晶面（０
面）径に対する結晶軸（Ｃｍ）の長さのアスペクト比を
１；１〜１；５の加工をすることで、磁粉として、結晶
異方性効果と形状異方性効果を持つことなる。That is, the crystal plane (0
By processing the magnetic powder so that the aspect ratio of the length of the crystal axis (Cm) to the surface diameter is 1:1 to 1:5, the magnetic powder has a crystal anisotropy effect and a shape anisotropy effect.
この結晶異方性効果と形状異方性効果を持った４〜５園
との磁粉を母体として、さらに、この磁粉より、形状の
小さい１〜３園戸の磁粉と１−Ｉ以下の磁粉を希望する
磁気特性に合わせて混合し、シランカップリング剖で表
面処理し、または、表面処理はなしで、少量の可塑剤と
離型剤を加えて、８〜２０ｗｔ％熱可塑性樹脂または４
〜５ｗｔ％熱硬化性ＩＩＩとともに、混練し、ペレット
にする。Using this magnetic powder of 4 to 5 sizes, which has crystal anisotropy effect and shape anisotropy effect, as a matrix, we also use magnetic particles of 1 to 3 types, which are smaller in shape than this magnetic powder, and magnetic particles of 1-I or less. 8-20wt% thermoplastic resin or 4% by mixing according to the desired magnetic properties, surface-treated with silane coupling, or without surface treatment, with the addition of a small amount of plasticizer and mold release agent.
Knead and pelletize with ~5 wt% thermoset III.
さらに、磁場中で、射出成形才たは、磁場中で圧縮成形
することで、残留磁束密度の高い、機械的強度の強いグ
ラスチックボンプント磁石を提供するものである。Furthermore, by injection molding or compression molding in a magnetic field, a glass-bonded magnet with high residual magnetic flux density and strong mechanical strength can be provided.
特に、本発明では、極興方性磁場で励磁して、成形する
ため、磁粉の含有率を８０％前後に低下し、磁材ペレッ
トのｉＨｃの比較的小さいものを用いることで、本発明
がなされた。In particular, in the present invention, since the magnetic powder content is reduced to around 80% and magnetic material pellets having a relatively small iHc are used for molding by excitation in a polar orthotropic magnetic field, the present invention can be achieved by It was done.
［実施例］
第１図は本発明に係わるストロンチュウムフエライトの
磁粉、またはバリウムフェライトの磁粉の０面径りに対
するＣ軸長さしの比（アスペクト比）を、１；１から１
：５にＴｍの磁粉構造を示すものである。[Example] Figure 1 shows the ratio (aspect ratio) of the C-axis length to the 0-plane diameter of the strontium ferrite magnetic powder or the barium ferrite magnetic powder according to the present invention from 1;1 to 1.
:5 shows the magnetic powder structure of Tm.
このような磁粉構造にすることで、結晶軸方向に磁粉粒
子を結晶成長させることになり、結晶軸に結晶異方性効
果が発生する。By forming such a magnetic powder structure, the magnetic powder particles are allowed to grow in the crystal axis direction, and a crystal anisotropy effect occurs in the crystal axis.
さらに、０面に比し、Ｃｍが長く取ることになり、結晶
異方性方向に、形状異方性効果が発生し、結晶異方性効
果に、さらに形状異方性効果が付加される。Furthermore, Cm is longer than that of the 0-plane, and a shape anisotropy effect occurs in the crystal anisotropy direction, and the shape anisotropy effect is further added to the crystal anisotropy effect.
以上、説明した磁粉の長い部分の大きさは４〜５”ｌで
あり・ さらに・ １〜３“ｌの中型・ １ｍ、ｌｚ以
下の小型の３１１の磁粉、必要とする磁気特性１１！械
特性に合わせて、任意の割合に混合する中型磁粉および
小型磁粉も、人望磁粉と同じように結晶異方性、形状異
方性の効果を持った磁粉であることが望ましいが、Ｗ法
王、加工ができない場合は、結晶異方性効果並びに形状
異方性効果を持たないものて′もよい
上記、混合磁粉を０．５〜１．５ｗｔ％のンランカブプ
リング剖 および、またはチタンカップリング剖で表面
処理し。The size of the long part of the magnetic powder explained above is 4 to 5"l. Furthermore, ・Medium size of 1 to 3"l・Small size of 1m, 1z or less 311 magnetic particles, required magnetic properties 11! It is desirable that medium-sized magnetic powder and small-sized magnetic powder, which are mixed in arbitrary proportions according to the mechanical properties, be magnetic powder that has crystal anisotropy and shape anisotropy effects in the same way as artificial magnetic powder. If processing is not possible, a material that does not have crystal anisotropy effect or shape anisotropy effect may be used. Surface treated with autopsy.
Ｏ〜２．Ｏｗｔ％可！！！剖および、または０１〜０．
５ｗｔ％の離型剤とを加えて、８〜１２ｗｔ％の熱可塑
性樹脂または３〜４ｗｔ％の熱硬化性＋１脂とともに、
混練し、さらにペレットした。O~2. Owt% possible! ! ! Autopsy and or 01-0.
5 wt% of mold release agent, along with 8 to 12 wt% of thermoplastic resin or 3 to 4 wt% of thermosetting + 1 resin,
The mixture was kneaded and then pelletized.
以上述べた構成のストロンチュウムフェライト磁粉と熱
可塑性！１脂とを混練して得たペレットを用いて、磁場
中で射出成形した結果、従来、表面磁束密度が１７００
Ｇａｕｓｓであったものが２０００ Ｇａｕｓｓにも
達した。Strontium ferrite magnetic powder with the above structure and thermoplasticity! As a result of injection molding in a magnetic field using pellets obtained by kneading 1 fat and 1 fat, the surface magnetic flux density was 1700
What used to be Gauss has now reached 2000 Gauss.
特に、磁場中での異方性効果を増強するため、従来、ス
トロンチュウムフエライトの残留磁束密度（Ｂｒ）が２
２７６ Ｇａｕｓｓであったものを３１００ Ｇａｕｓ
ｓとし、固有保磁力（ｉＨｃ）については、従来、３１
１００ｅｓｔｅｄを２６４００ ｅｓｔｅｄとして、磁
粉として、 Ｈｅの比較的小さいものを用いた。In particular, in order to enhance the anisotropy effect in a magnetic field, the residual magnetic flux density (Br) of strontium ferrite has traditionally been
What was 276 Gauss is now 3100 Gauss
s, and the intrinsic coercive force (iHc) is conventionally 31
100 ested was changed to 26400 ested, and a relatively small amount of He was used as the magnetic powder.
上記説明に、可塑剤および離型剤を磁粉と樹脂の混線時
に、加えることを述べたが、必要に応じて、これらを除
いてもよい。In the above description, it has been described that a plasticizer and a mold release agent are added when the magnetic powder and resin are mixed, but these may be removed if necessary.
第２図はＮ極５及びＳ極６を磁極として、極異方性着磁
成形をしたときのプラスチック磁石の内部の磁粉の配列
を示したものである。FIG. 2 shows the arrangement of magnetic particles inside a plastic magnet when polar anisotropic magnetization molding is performed using the north pole 5 and the south pole 6 as magnetic poles.
第１図に示す４〜５ｍｆ（大型）磁粉１と１〜３■との
中型の磁粉２とＩｌｌ、４／以下の磁粉３がＮ極５およ
びＳ極６では磁極の内部磁界の方向に向かってきれいに
配列している。As shown in Fig. 1, medium-sized magnetic particles 2 and Ill, 4/ or smaller magnetic particles 3 of 4-5mf (large) magnetic particles 1 and 1-3■ are directed toward the internal magnetic field of the magnetic poles at N pole 5 and S pole 6. They are arranged neatly.
中性点７．８においては磁粉の配列はない表面磁束密度
が２０００ Ｇａｕｓｓを示したものは第２図のような
磁粉配列を示していた。At the neutral point 7.8, there is no magnetic particle arrangement.The surface magnetic flux density of 2000 Gauss showed the magnetic particle arrangement as shown in FIG.
［発明の効果］
１）本発明のような磁粉構成とすることより、成形した
フェライトプラスチック磁石は、従来のものに比べ、磁
束密度が１０％も向上させることができた。[Effects of the Invention] 1) By using the magnetic powder structure of the present invention, the molded ferrite plastic magnet was able to improve the magnetic flux density by as much as 10% compared to conventional magnets.
２）本発明の大、中、小の磁粉が互いに磁石の中で、く
みあい密度を高めていると同時に磁粉の表面処理剤と変
成した１２ナイロンの効果で結合力が増加し、軸との圧
入代０．１１程度の強圧入をしても何等、割れることの
ないプラスチック磁石とすることができた。2) The large, medium, and small magnetic particles of the present invention are interlocked with each other in the magnet to increase the density, and at the same time, the surface treatment agent of the magnetic particles and the effect of the modified 12 nylon increase the bonding force, making it possible to press-fit with the shaft. We were able to create a plastic magnet that would not break even if it was force-fitted with a force of about 0.11.
第１図は本発明による磁粉の結晶構造を示す説明図
第２図は本発明に係わる極異方性成形したプラスチック
磁石の磁粉配列を図形的に示したものである。
１−アスペクト比をもった４〜５−μの磁粉２−１〜３
ｍ／／の中型の磁粉、３−１−μ以下の小型の磁粉、
５−Ｎ極、６−５極、７．８−磁気的に配列していない
中性部分、
Ｄ−結晶面（０面）の直径、Ｌ−結晶軸（Ｃ軸）の長さ
第１図FIG. 1 is an explanatory diagram showing the crystal structure of the magnetic powder according to the present invention. FIG. 2 is a graphical illustration of the magnetic powder arrangement of the polar anisotropically molded plastic magnet according to the present invention. 4-5-μ magnetic powder with 1-aspect ratio 2-1-3
m// medium-sized magnetic particles, small magnetic particles of 3-1-μ or less,
5-N pole, 6-5 pole, 7.8-neutral part that is not magnetically aligned, D-diameter of crystal plane (0 plane), L-length of crystal axis (C axis) Fig. 1
Claims (1)
の結晶面の径に対する結晶軸（Ｃ軸）の長さとのアスペ
クト比を、１：１〜５とし、結晶軸の長さが、４〜５ｍ
μとした磁粉と、粉径１〜３ｍμの磁粉と、粉径１ｍμ
以下の磁粉との３種の磁粉について、該３種の磁粉を任
意の割合に、混合した混合磁粉を製作し、該混合磁粉を
０．５〜１．５ｗｔ％のシランカップリング剤または、
およびチタンカップリング剤で表面処理をし、または、
表面処理なしのままで、１．０〜２．０ｗｔ％可塑剤と
０．１〜０．５ｗｔ％離型剤とを加えて、熱可塑性樹脂
、または、熱硬化性樹脂とともに混練し、さらに、ペレ
ットを製造し、該ペレットを磁場中にて、射出成形また
は、磁場中にて、圧縮成形したことを特徴とするプラス
チックボンデット磁石。The aspect ratio of the length of the crystal axis (C axis) to the diameter of the crystal plane of barium ferrite or strontium ferrite is 1:1 to 5, and the length of the crystal axis is 4 to 5 m.
μ magnetic powder, magnetic powder with a powder diameter of 1 to 3 mμ, and powder diameter 1 mμ
For the following three types of magnetic powder, a mixed magnetic powder is prepared by mixing the three types of magnetic powder in an arbitrary ratio, and the mixed magnetic powder is mixed with 0.5 to 1.5 wt% of a silane coupling agent or
and surface treatment with a titanium coupling agent, or
Without surface treatment, 1.0 to 2.0 wt% plasticizer and 0.1 to 0.5 wt% mold release agent are added and kneaded with a thermoplastic resin or thermosetting resin, and further, A plastic bonded magnet characterized in that pellets are manufactured and the pellets are injection molded in a magnetic field or compression molded in a magnetic field.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9386490A JPH03292702A (en) | 1990-04-11 | 1990-04-11 | Plastic bonded magnet |
| PCT/JP1990/000827 WO1991001562A1 (en) | 1989-07-24 | 1990-06-26 | Anisotropic plastic-bonded magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9386490A JPH03292702A (en) | 1990-04-11 | 1990-04-11 | Plastic bonded magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03292702A true JPH03292702A (en) | 1991-12-24 |
Family
ID=14094312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9386490A Pending JPH03292702A (en) | 1989-07-24 | 1990-04-11 | Plastic bonded magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03292702A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007129168A (en) * | 2005-11-07 | 2007-05-24 | Kaneka Corp | Resin magnet composition and method of manufacturing same |
-
1990
- 1990-04-11 JP JP9386490A patent/JPH03292702A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007129168A (en) * | 2005-11-07 | 2007-05-24 | Kaneka Corp | Resin magnet composition and method of manufacturing same |
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