JPH0621325B2 - Iron-silicon sintered material with low residual magnetic flux density and its manufacturing method - Google Patents
Iron-silicon sintered material with low residual magnetic flux density and its manufacturing methodInfo
- Publication number
- JPH0621325B2 JPH0621325B2 JP60293179A JP29317985A JPH0621325B2 JP H0621325 B2 JPH0621325 B2 JP H0621325B2 JP 60293179 A JP60293179 A JP 60293179A JP 29317985 A JP29317985 A JP 29317985A JP H0621325 B2 JPH0621325 B2 JP H0621325B2
- Authority
- JP
- Japan
- Prior art keywords
- powder
- iron
- flux density
- magnetic flux
- yoke
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0207—Using a mixture of pre-alloyed powders or a master alloy
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Impact Printers (AREA)
- Powder Metallurgy (AREA)
- Soft Magnetic Materials (AREA)
Description
【発明の詳細な説明】 ［発明の技術分野］ 本発明は残留磁束密度の低い鉄（Ｆｅ）−ケイ素（Ｓ
ｉ）系焼結材料とその製造方法に関し、更に詳しくは、
ドットプリンター用のヘッドヨーク材としての磁気特性
に優れた残留磁束密度の低いＦｅ−Ｓｉ系焼結材料とそ
の製造方法に関する。TECHNICAL FIELD OF THE INVENTION The present invention relates to iron (Fe) -silicon (S) having a low residual magnetic flux density.
Further details regarding the i) -based sintered material and the method for producing the same,
The present invention relates to a Fe—Si based sintered material having excellent residual magnetic flux density and excellent magnetic characteristics as a head yoke material for a dot printer, and a method for manufacturing the same.
［発明の技術的背景とその問題点］ Ｆｅ−Ｓｉ系合金は磁性材料として広く用いられてい
る。例えば、ドットプリンター用のヘッドヨーク材には
Ｆｅ−３％Ｓｉ合金が多用されている。[Technical Background of the Invention and Problems Thereof] Fe—Si alloys are widely used as magnetic materials. For example, a head yoke material for a dot printer is often made of Fe-3% Si alloy.
このヨーク材は、通常、所定形状の型内に上記合金の融
液を注入しそれを冷却したのち型から取出すというロス
トワックス法で製造されている。This yoke material is usually manufactured by the lost wax method in which a melt of the alloy is poured into a mold of a predetermined shape, cooled, and then taken out of the mold.
しかしながら、この方法で製造したヨーク材は、それを
ドットプリンターに実装した場合、低速用のプリンター
では問題を生じないが、しかし高速用のプリンターにあ
っては磁気の切れが悪いという問題が生じている。この
問題に対し、本発明者らは以下の様に考えた。However, when the yoke material manufactured by this method is mounted on a dot printer, it does not cause a problem in low-speed printers, but in high-speed printers, there is a problem that the magnetic cutoff is bad. There is. With respect to this problem, the present inventors considered as follows.
これはヨーク材の残留磁束密度（Ｂｒ）が大きいことに
起因する問題である。すなわち、ヨーク材への入力信号
をオフにした場合、その瞬間にあってもヨーク材に残留
する磁束密度が比較的大きな値であるため、依然として
ヨーク材が磁気作用を継続するからである。This is a problem caused by the large residual magnetic flux density (Br) of the yoke material. That is, when the input signal to the yoke material is turned off, the magnetic flux density remaining in the yoke material has a relatively large value even at that moment, so that the yoke material still continues the magnetic action.
したがって、この磁気の切れの悪さを改善するために
は、Ｂｒを低めた材料をヨーク材に用いればよい。Therefore, in order to improve the poor cutting of the magnetism, a material having a reduced Br may be used for the yoke material.
そのためには、ヨーク材を構成する合金において、Ｆｅ
−Ｓｉの結晶粒を可及的に小さくすればよいということ
に本発明者らは気が付いたのである。To that end, in the alloy forming the yoke material, Fe
The present inventors have found that the crystal grains of —Si should be made as small as possible.
しかしながら、前述したロストワックス法ではＦｅ−Ｓ
ｉ結晶粒の大きを制御することが極めて困難である。し
かも、あるいは条件下でＢｒを低下せしめることに成功
したとしても、そのとき同時に、ヨーク材の磁気作用を
左右する保磁力（Ｈｃ）も低下するという事態が生じて
しまう。However, in the lost wax method described above, Fe-S
It is extremely difficult to control the size of the i crystal grain. Moreover, even if the Br is successfully reduced under the conditions, at the same time, the coercive force (Hc) that influences the magnetic action of the yoke material is also reduced.
［発明の目的］ 本発明は、上記した問題を解決し、ヨーク材として用い
たときに磁気の切れが良好な、残留磁束密度の低い鉄−
ケイ素系焼結材料とその製造方法の提供を目的とする。[Object of the Invention] The present invention solves the above-mentioned problems, and when used as a yoke material, has good magnetic disconnection and iron with a low residual magnetic flux density.
An object is to provide a silicon-based sintered material and a method for producing the same.
［発明の概要］ 本発明者らは、磁気の切れを規則する因子はＢｒであ
り、そのＢｒはＦｅ−Ｓｉ結晶粒の大きさによって左右
されるという知見に基づき、鋭意研究を重ねた結果、所
定粒度に調整したＦｅ粉，Ｆｅ−Ｓｉ粉を用いた母合金
法によって製造した焼結品は、上記目的を達成し得ると
の事実を見出し、本発明の材料とその製造方法を開発す
るに到った。[Summary of the Invention] The inventors of the present invention have conducted extensive studies based on the finding that the factor that regulates magnetic breakage is Br, and the Br is dependent on the size of Fe-Si crystal grains. It was found that a sintered product produced by a master alloy method using Fe powder and Fe-Si powder adjusted to have a predetermined grain size can achieve the above object, and therefore, to develop the material of the present invention and the production method thereof. Arrived
すなわち、本発明の残留磁束密度の低いＦｅ−Ｓｉ系焼
結材料は、平均結晶粒径が４３μｍ以下であることを特
徴とし、その製造方法は、平均粒径が３０μｍ以下であ
るＦｅ−Ｓｉ系合金粉末と、平均粒径が４３μｍ以下で
あるＦｅ粉とを混合し、得られた混合粉を順次成形，焼
結することを特徴とする。なお、ヨーク材として用いる
Ｆｅ−Ｓｉ系焼結材料とするためには、上記のＦｅ−Ｓ
ｉ系合金粉末とＦｅ粉とを混合する際のＳｉ含有量を３
重量％程度、すなわちＦｅ−（２．５〜３．５）％Ｓｉ
とすることが好ましい。That is, the Fe-Si based sintered material of the present invention having a low residual magnetic flux density is characterized by having an average crystal grain size of 43 μm or less, and the manufacturing method thereof is an Fe—Si based material having an average grain size of 30 μm or less. The alloy powder is mixed with Fe powder having an average particle size of 43 μm or less, and the obtained mixed powder is sequentially molded and sintered. In order to use the Fe—Si based sintered material used as the yoke material, the above Fe—S is used.
When the i-based alloy powder and the Fe powder are mixed, the Si content is set to 3
About wt%, that is, Fe- (2.5 to 3.5)% Si
It is preferable that
すなわち、平均粒径が３０μｍ以下のＦｅ−Ｓｉ系合金
粉末と平均粒径が４３μｍ以下のＦｅ粉とを母合金法に
より製造すると、平均結晶粒径が４３μｍ以下のＦｅ−
Ｓｉ系焼結材料が得られる。このものは残留磁束密度が
低く、磁気の切れが優れている。That is, when Fe—Si alloy powder having an average particle size of 30 μm or less and Fe powder having an average particle size of 43 μm or less are manufactured by the mother alloy method, Fe— having an average crystal particle size of 43 μm or less is produced.
A Si-based sintered material is obtained. This product has a low residual magnetic flux density and is excellent in cutting off magnetism.
本発明の材料は、合金粉とＦｅ粉とを原料粉とする母合
金法で製造された焼結品である。The material of the present invention is a sintered product produced by a master alloy method using alloy powder and Fe powder as raw material powders.
原料粉の１つである合金粉は、Ｓｉを１０〜２０重量％
含有するものが好ましい。Ｓｉの含有量が上記範囲にあ
ると、後述する成形体を焼結する際に、１２００〜１３
００℃の低い焼結温度で液相焼結をすることができ焼結
炉の設備面および省エネルギーの面で資すること大であ
ると同時に、焼結品の磁気特性が優れたものになりやす
い。The alloy powder, which is one of the raw material powders, contains 10 to 20% by weight of Si.
What is contained is preferable. When the content of Si is in the above range, 1200 to 13 is obtained when the molded body described later is sintered.
Liquid phase sintering can be performed at a low sintering temperature of 00 ° C., which greatly contributes to the equipment of the sintering furnace and energy saving, and at the same time, the magnetic properties of the sintered product tend to be excellent.
用いるＦｅ−Ｓｉ系合金粉は、その平均粒径が３０μｍ
以下好ましくは８〜２０μｍの範囲に設定される。粗大
な合金粉を用いると、得られた焼結品の密度が低くなる
ため、磁気特性が劣化しやすく、逆にあまり細かい合金
粉を用いると合金の偏析，成形性の悪化などの傾向を生
じやすいからである（もっとも細かい方はかなり細かく
ても有効である。）。The Fe-Si alloy powder used has an average particle size of 30 μm.
Hereafter, it is preferably set in the range of 8 to 20 μm. If a coarse alloy powder is used, the density of the obtained sintered product will be low, and the magnetic properties will easily deteriorate. Conversely, if too fine an alloy powder is used, segregation of the alloy and deterioration of formability will occur. Because it is easy (the finest one is effective even if it is quite fine).
他の原料粉であるＦｅ粉は、その平均粒径が４３μｍ以
下好ましくは５〜１０μｍの範囲に設定される。粗大な
Ｆｅ粉の場合は、得られた焼結品のＢｒは低下せず、逆
にあまり細かいＦｅ粉を用いた場合（もっとも細かいＦ
ｅ粉はかなり細かくても有効である。）は、成形性の悪
化，保磁力の増大などの傾向が生じやすいからである。The Fe powder, which is another raw material powder, has an average particle size of 43 μm or less, preferably 5 to 10 μm. In the case of coarse Fe powder, the Br of the obtained sintered product did not decrease, and conversely when too fine Fe powder was used (the finest F
The e-powder is effective even if it is quite fine. ) Is because a tendency such as deterioration of formability and increase of coercive force is likely to occur.
本発明にあっては、上記したＦｅ−Ｓｉ系合金粉とＦｅ
粉とを混合する。両者の混合割合は、前者５〜５０重量
％，後者９５〜５０重量％に設定することが好ましい。In the present invention, the above-mentioned Fe-Si alloy powder and Fe
Mix with powder. The mixing ratio of the two is preferably set to the former 5 to 50% by weight and the latter 95 to 50% by weight.
Ｆｅ−Ｓｉ系合金粉の混合割合が５重量％より多い場合
（したがってＦｅ粉の割合が９５重量％より少ない場
合）は、得られた焼結品の良好な成形性，密度の向上及
び良好な磁気特性が得られやすく、また混合割合が５０
重量％より少ない場合は焼結品は均一なＦｅ−Ｓｉ組成
になりやすく、機能的な磁気特性が得られやすい。When the mixing ratio of the Fe-Si alloy powder is more than 5% by weight (thus, the ratio of Fe powder is less than 95% by weight), the obtained sintered product has good formability, improved density and good Magnetic properties are easily obtained, and the mixing ratio is 50
When the content is less than wt%, the sintered product tends to have a uniform Fe-Si composition, and functional magnetic characteristics are likely to be obtained.
得られた場合粉に例えばステアリン酸亜鉛のような成形
助剤を適量配合したのち所定の型に充填し、例えば４〜
８ ton／cm２の圧を印加して成形し、ついでこの成形体
を焼結する。When obtained, the powder is mixed with an appropriate amount of a molding aid such as zinc stearate and then filled in a predetermined mold, for example, 4 to
A pressure of 8 ton / cm 2 is applied for molding, and then the molded body is sintered.
焼結は、水素，真空中のような雰囲気中（非酸化性雰囲
気中）で、温度１０５０〜１２００℃にて約１時間程度
行なうことが好ましい。Sintering is preferably performed in an atmosphere such as hydrogen or vacuum (in a non-oxidizing atmosphere) at a temperature of 1050 to 1200 ° C. for about 1 hour.
この焼結温度ではＳｉのＦｅ粉粒子への拡散が進行し
て、最終的にはＳｉが均一に分散したＦｅ−Ｓｉ合金と
なる。本発明にあっては、用いるＦｅ−Ｓｉ系合金粉，
Ｆｅ粉がいずれも小さくかつ整粒されているので、得ら
れるＦｅ−Ｓｉ結晶粒も小さくなり、焼結品全体のＢｒ
が低下するのである。At this sintering temperature, diffusion of Si into the Fe powder particles progresses, and finally a Fe-Si alloy in which Si is uniformly dispersed is formed. In the present invention, Fe-Si alloy powder used,
Since all the Fe powders are small and the particle size is regulated, the obtained Fe-Si crystal particles are also small, and the Br of the whole sintered product is small.
Is reduced.
［発明の実施例］ ・実施例１ 平均粒径４３μｍ以下のアトマイズ鉄粉（純鉄）と、平
均粒径３０μｍ以下のＦｅ−Ｓｉ合金粉とを混合して、
Ｓｉを３重量％含有する混合粉とした。この混合粉に約
１重量％のステアリン酸亜鉛を添加したのち、所定の型
に充填し約７ ton／cm２の圧力で成形した。得られた成
形体を真空炉中にて、温度１２００℃で約１時間焼結し
た。[Examples of the invention] -Example 1 Atomized iron powder (pure iron) having an average particle diameter of 43 µm or less and Fe-Si alloy powder having an average particle diameter of 30 µm or less are mixed,
A mixed powder containing 3% by weight of Si was prepared. After adding about 1% by weight of zinc stearate to this mixed powder, it was filled in a predetermined mold and molded at a pressure of about 7 ton / cm 2 . The obtained molded body was sintered in a vacuum furnace at a temperature of 1200 ° C. for about 1 hour.
Ｓｉ含有量３重量％で残部はＦｅである平均結晶粒径が
３８μｍのドットプリンター用のヘッドヨークが得られ
た。A head yoke for a dot printer having a Si content of 3% by weight and the balance being Fe and having an average crystal grain size of 38 μm was obtained.
得られたヨークを実機に装着して、第１図のようにヨー
ク１に一次コイル（励磁）２と二次コイル（検出）３を
それぞれ巻回し、二次コイル３から検出される時間経過
に対する電流波形を測定した。その結果を第２図（ａ）
として示した。The obtained yoke is mounted on an actual machine, and the primary coil (excitation) 2 and the secondary coil (detection) 3 are wound around the yoke 1 as shown in FIG. The current waveform was measured. The results are shown in Fig. 2 (a).
Indicated as.
・比較例１ ロストワックス法で製作したヨークについても実施例１
と同様の測定を行ないその結果を第２図（ｂ）として示
した。Comparative Example 1 A yoke manufactured by the lost wax method was also used in Example 1.
The same measurement as above was performed, and the result is shown in FIG. 2 (b).
・比較例２ 平均粒径８０μｍ以下のアトマイズ鉄粉と、平均粒径５
０μｍ以下のＦｅ−Ｓｉ合金粉を用いる以外は実施例１
と同様にして、ドットプリンター用ヘッドヨークを得
た。Comparative Example 2 Atomized iron powder having an average particle size of 80 μm or less, and an average particle size of 5
Example 1 except that Fe-Si alloy powder of 0 μm or less was used.
A dot printer head yoke was obtained in the same manner as in.
図から明らかなように、本発明方法で製作したヨーク
は、比較例のヨークに比べて電流の切れが速い、すなわ
ち磁気の切れが速くヨークとしての特性が優れている。As is apparent from the figure, the yoke manufactured by the method of the present invention has a faster current cut, that is, a faster magnetic cut than the yoke of the comparative example, and has excellent characteristics as a yoke.
ちなみに、本発明による実施例１で得られた焼結品、比
較例１で得られた合金、及び比較例２で得られた焼結品
のＢｒとＨｃを直流磁場の条件下で測定した。その結果
を、比較例合金の値を１００％とした相対値として表に
示した ［発明の効果］ 以上の説明で明らかなように、本発明の焼結材料は、Ｈ
ｃが従来の材料と同等の大きさであり、Ｂｒのみが適正
に低下した材料である。したがって、ドットプリンター
用のヘッドヨーク材として用いたとき入力するオフ信号
への追随性に優れ、磁気の切れが良好である。By the way, Br and Hc of the sintered product obtained in Example 1 according to the present invention, the alloy obtained in Comparative Example 1 and the sintered product obtained in Comparative Example 2 were measured under the condition of a DC magnetic field. The results are shown in the table as relative values with the value of the comparative alloy being 100%. [Effects of the Invention] As is clear from the above description, the sintered material of the present invention is H
c is the same size as the conventional material, and only Br is appropriately reduced. Therefore, when it is used as a head yoke material for a dot printer, it has excellent followability to an OFF signal that is input, and magnetic breakage is good.
また、その製造方法は、母合金法を適用した粉末治金法
であるため、複雑形状品を簡単に製造することができそ
の製造コストの低減を可能にして有用である。Moreover, since the manufacturing method is a powder metallurgy method to which a mother alloy method is applied, a complicated shaped product can be easily manufactured, and the manufacturing cost can be reduced, which is useful.
第１図はヨークの磁気の切れを判定する方法を説明する
ための図である。第２図（ａ）は、本発明方法によるヨ
ークの電流波形図，第２図（ｂ）はロストワックス法に
よるヨークの電流波形図である。 １……ヨーク、２……一次コイル ３……二次コイルFIG. 1 is a diagram for explaining a method for determining the magnetic breakage of the yoke. FIG. 2 (a) is a current waveform diagram of the yoke according to the method of the present invention, and FIG. 2 (b) is a current waveform diagram of the yoke according to the lost wax method. 1 ... Yoke 2 ... Primary coil 3 ... Secondary coil
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０１Ｆ 1/22 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI technical display area H01F 1/22
Claims (2)
特徴とする残留磁束密度の低い鉄−ケイ素系焼結材料。1. An iron-silicon based sintered material having a low residual magnetic flux density, which has an average crystal grain size of 43 μm or less.
系合金粉末と、平均粒径が４３μｍ以下である鉄分とを
混合し、得られた混合粉を順次成形、焼結することを特
徴とする残留磁束密度の低い鉄−ケイ素系焼結材料の製
造方法。2. An iron-silicon alloy powder having an average particle size of 30 μm or less and an iron component having an average particle size of 43 μm or less are mixed, and the obtained mixed powder is sequentially molded and sintered. And a method for producing an iron-silicon based sintered material having a low residual magnetic flux density.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60293179A JPH0621325B2 (en) | 1985-12-27 | 1985-12-27 | Iron-silicon sintered material with low residual magnetic flux density and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60293179A JPH0621325B2 (en) | 1985-12-27 | 1985-12-27 | Iron-silicon sintered material with low residual magnetic flux density and its manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62156249A JPS62156249A (en) | 1987-07-11 |
| JPH0621325B2 true JPH0621325B2 (en) | 1994-03-23 |
Family
ID=17791435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60293179A Expired - Lifetime JPH0621325B2 (en) | 1985-12-27 | 1985-12-27 | Iron-silicon sintered material with low residual magnetic flux density and its manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0621325B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102649158A (en) * | 2011-02-25 | 2012-08-29 | 山东金聚粉末冶金有限公司 | Tooth yoke and manufacturing method thereof |
| JP6501148B2 (en) * | 2015-03-12 | 2019-04-17 | 日立化成株式会社 | Magnetic sheet material using green compact and method of manufacturing the same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5235006B2 (en) * | 1973-03-09 | 1977-09-07 | ||
| JPS60165302A (en) * | 1984-02-09 | 1985-08-28 | Sumitomo Electric Ind Ltd | Preparation of soft magnetic sintered material |
| JPS61231136A (en) * | 1985-04-03 | 1986-10-15 | Hitachi Metals Ltd | Soft magnetic sintered iron-silicon material and its manufacture |
-
1985
- 1985-12-27 JP JP60293179A patent/JPH0621325B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62156249A (en) | 1987-07-11 |
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