JPH03291305A - Manufacture of shape anisotropic and soft magnetic alloy powder - Google Patents
Manufacture of shape anisotropic and soft magnetic alloy powderInfo
- Publication number
- JPH03291305A JPH03291305A JP2093117A JP9311790A JPH03291305A JP H03291305 A JPH03291305 A JP H03291305A JP 2093117 A JP2093117 A JP 2093117A JP 9311790 A JP9311790 A JP 9311790A JP H03291305 A JPH03291305 A JP H03291305A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- alloy powder
- silicone oil
- soft magnetic
- alloy
- 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 71
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 229910001004 magnetic alloy Inorganic materials 0.000 title claims description 12
- 239000000956 alloy Substances 0.000 claims abstract description 28
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 27
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 12
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 239000003921 oil Substances 0.000 claims description 2
- 229920002545 silicone oil Polymers 0.000 abstract description 22
- 238000010438 heat treatment Methods 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 9
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 4
- 239000000377 silicon dioxide Substances 0.000 abstract description 4
- 239000012298 atmosphere Substances 0.000 abstract description 3
- 229910052681 coesite Inorganic materials 0.000 abstract description 3
- 229910052906 cristobalite Inorganic materials 0.000 abstract description 3
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 238000010298 pulverizing process Methods 0.000 abstract description 3
- 229910052682 stishovite Inorganic materials 0.000 abstract description 3
- 229910052905 tridymite Inorganic materials 0.000 abstract description 3
- 238000000354 decomposition reaction Methods 0.000 abstract description 2
- 230000005389 magnetism Effects 0.000 abstract description 2
- 230000001590 oxidative effect Effects 0.000 abstract description 2
- 229910017082 Fe-Si Inorganic materials 0.000 abstract 1
- 229910017133 Fe—Si Inorganic materials 0.000 abstract 1
- 238000005336 cracking Methods 0.000 abstract 1
- 238000010299 mechanically pulverizing process Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 239000002245 particle Substances 0.000 description 11
- 230000005291 magnetic effect Effects 0.000 description 10
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- 230000005415 magnetization Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000006247 magnetic powder Substances 0.000 description 2
- 229910000979 O alloy Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000004850 liquid epoxy resins (LERs) Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemically Coating (AREA)
- Soft Magnetic Materials (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、高い磁化を有するＦｅとＳｔを主成分として
含有する形状異方性軟磁性合金粉末の製造方法に関する
。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for producing a shape-anisotropic soft magnetic alloy powder containing Fe and St as main components and having high magnetization.
［従来の技術］
従来、安価にして高い磁化を有する鉄（Ｆｅ）は、磁性
材料においては最も重要な物質となっている。一般に、
Ｆｅ、及びＳｉを主成分とする合金は、磁化が容易であ
る軟磁性をしめす。これらＦｅ、及びＳｉを主成分とす
る軟磁性合金は、塊状や板状で使用される事が通例とな
っていた。[Prior Art] Conventionally, iron (Fe), which is inexpensive and has high magnetization, has been the most important substance in magnetic materials. in general,
Alloys containing Fe and Si as main components exhibit soft magnetism that allows easy magnetization. These soft magnetic alloys containing Fe and Si as main components have generally been used in the form of blocks or plates.
しかしながら、近年、形状が容易に選択できる磁性を有
する粉末を使用した成形、塗布等の手法か活用されてい
る。一般に、磁性粉末は金属の占める割合が少なくなる
ために、単位体積当りの磁化量が小さくなる傾向となる
。それに加えて１粒状化にともない反磁界の影響も大き
くなり、磁化特性が低下する傾向となる。However, in recent years, methods such as molding and coating using magnetic powder whose shape can be easily selected have been utilized. Generally, since the proportion of metal in magnetic powder decreases, the amount of magnetization per unit volume tends to decrease. In addition, as the grain size increases, the influence of the demagnetizing field increases, and the magnetization characteristics tend to deteriorate.
これらの粉末形成することによる特性の負の減少を軽減
するためには、粉末に形状異方性を付与し２特定の方向
にのみ磁化を容易にする方法が有用となる。In order to alleviate the negative decrease in properties caused by forming these powders, it is useful to provide shape anisotropy to the powder to facilitate magnetization only in two specific directions.
これらの形状異方性軟磁性合金粉末（合金粉末）は１機
械的粉砕方法（ボールミル、アトライター等）を使用し
１合金粉末粒子に繰返し変形を与えることにより製造す
る方法が一般的である。These shape-anisotropic soft magnetic alloy powders (alloy powders) are generally manufactured by repeatedly deforming the alloy powder particles using a mechanical grinding method (ball mill, attritor, etc.).
一般に、繰返し変形を受けた合金材料は、加工ひずみの
蓄積により軟磁気特性が劣化する傾向を有する。こうし
た軟磁気特性の劣化に対しては。In general, alloy materials that have been repeatedly deformed tend to have soft magnetic properties deteriorate due to accumulation of processing strain. Regarding this deterioration of soft magnetic properties.
粉砕後の合金粉末に、熱処理による加工ひずみの除去を
施すことが有効である。It is effective to heat-treat the alloy powder after crushing to remove processing strain.
［発明が解決しようとする課題］
しかしながら、これら形状異方性軟磁性合金粉末は、微
細化にともない比表面積が増大し、焼結性が向上してい
ることが多い。このため０合金粉末を熱処理した場合１
合金粉末相互の結着（焼結）が起こり１合金粉末の特徴
である異方性形状を著しく損うといった欠点が存在する
。[Problems to be Solved by the Invention] However, these shape-anisotropic soft magnetic alloy powders often have an increased specific surface area and improved sinterability as they become finer. Therefore, when 0 alloy powder is heat treated, 1
There is a drawback that the alloy powders mutually bind (sinter), which significantly impairs the anisotropic shape that is a characteristic of the 1-alloy powder.
そこで１本発明の技術的課題は、前述の問題点を解決す
るために、形状異方性軟磁性合金粉末表面に、シリコン
オイルから生成するケイ素酸化物皮膜を生成させること
により５熱処理工程において合金粉末相互が結着するこ
とがなく、後工程において、解砕、粉砕工程を短縮する
ことができ製造が容易な軟磁性特性に優れた形状異方性
軟磁性合金粉末を提供することにある。Therefore, one technical problem of the present invention is to solve the above-mentioned problems by forming a silicon oxide film produced from silicone oil on the surface of the shape-anisotropic soft magnetic alloy powder. It is an object of the present invention to provide a shape-anisotropic soft magnetic alloy powder with excellent soft magnetic properties, which is easy to manufacture and can shorten the crushing and pulverizing steps in subsequent steps without causing powders to bind to each other.
［発明が解決しようとする課題］
本発明においては、Ｆｅ、及びＳｔを主成分とする形状
異方性軟磁性合金粉末の軟磁気特性を改善する方法にお
いて、粉末相互が結着することなく、即ち、粉末の異方
性形状及び分散性を損うことなく熱処理を行ない、軟磁
気特性に優れた合金粉末を製造できるように構成された
ものである。[Problems to be Solved by the Invention] In the present invention, in a method for improving the soft magnetic properties of shape-anisotropic soft magnetic alloy powder containing Fe and St as main components, That is, the structure is such that heat treatment can be performed without impairing the anisotropic shape and dispersibility of the powder, and alloy powder with excellent soft magnetic properties can be produced.
本発明によれば、Ｆｅ及びＳｉを主成分として含有する
合金から強磁性粉末を製造する方法において、前記合金
粉末を機械的粉砕し、得られた合金粉末にシリコンオイ
ルを０，５〜５．０ｗｔ％混合した後、熱処理すること
を特徴とする形状異方性軟磁性合金粉末の製造方法が得
られる。According to the present invention, in a method for producing ferromagnetic powder from an alloy containing Fe and Si as main components, the alloy powder is mechanically pulverized, and silicone oil is added to the obtained alloy powder at a rate of 0.5 to 5. A method for producing a shape-anisotropic soft magnetic alloy powder is obtained, which is characterized in that a heat treatment is performed after mixing 0 wt %.
即ち、詳しく本発明の形状異方性軟磁性合金粉末の製造
方法を説明すると、前述の様に機械的粉砕方法により形
状異方性を付与されたＦｅ、及びＳｉを主成分とする合
金粉末に対し、シリコンオイルを０．５≦Ｘ≦５重量％
添加し、該金属粉末中に分散させた後、酸化性雰囲気中
にて加熱し、前記合金粉末表面を、シリコンオイルの分
解、酸化により生成した二酸化ケイ素（Ｓ ｉｏ ２
）″Ｃ−被覆することによって、熱処理過程における粉
末粒子の焼結進行が阻害され１合金粉末相互の結着の防
止に寄与するものと考えられる。That is, to explain in detail the method for manufacturing the shape-anisotropic soft magnetic alloy powder of the present invention, as mentioned above, the shape-anisotropy is imparted to the alloy powder mainly composed of Fe and Si. On the other hand, silicone oil is 0.5≦X≦5% by weight.
After adding and dispersing in the metal powder, it is heated in an oxidizing atmosphere, and the surface of the alloy powder is coated with silicon dioxide (S io 2 ) produced by decomposition and oxidation of silicon oil.
)''C-It is believed that the coating inhibits the progress of sintering of the powder particles during the heat treatment process and contributes to preventing the one-alloy powder from binding to each other.
本発明において１合金粉末に対してシリコンオイルの混
色量を０．５ ｖｔ％以上と限定したのは、それ以上で
熱処理による粉末の結着防止効果が顕著に認められるか
らである。In the present invention, the amount of silicone oil mixed with one alloy powder is limited to 0.5 vt% or more because, if the amount is more than 0.5%, the effect of preventing powder binding due to heat treatment is noticeable.
一方１合金粉末に対してシリコンオイルの混合量を５ｖ
ｔ％以下としたのは、それを越える領域では熱処理を施
した粉末の ＩＨｃが著しく増加し。On the other hand, the mixed amount of silicone oil for 1 alloy powder is 5v.
The reason for setting it below t% is that the IHc of the heat-treated powder increases significantly in the region exceeding this range.
粉末の軟磁気特性が明らかに劣化するからである。This is because the soft magnetic properties of the powder are obviously deteriorated.
［実施例］ 以下、実施例について述べる。[Example] Examples will be described below.
実施例１
純度が９９．８％以上の鉄（Ｆｅ）及びケイ素（Ｓｉ）
を使用し、アルゴン雰囲気中で高周波加熱により、Ｓｌ
が８ｖｔ％で残部Ｆｅの厚さ約２０μｍのインゴット作
製した。Example 1 Iron (Fe) and silicon (Si) with a purity of 99.8% or more
using high-frequency heating in an argon atmosphere.
An ingot having a thickness of about 20 μm and having a Fe content of 8 vt% and a balance of Fe was produced.
次に、これらインゴットを、ショークラッシャー及びロ
ールクラッシャーを用いて０．５μ−以下に粗粉砕した
。この粗粉砕粉末を、ステンレスポル及びエタノールを
用いて湿式でボールミル粉砕し、平均直径が約４０μ■
で厚さが１μ−の円板状粒子からなる偏平化粉末を作製
した。Next, these ingots were coarsely crushed to 0.5 μm or less using a show crusher and a roll crusher. This coarsely ground powder was wet-ground in a ball mill using stainless steel and ethanol, and the average diameter was approximately 40μ.
A flattened powder consisting of disc-shaped particles having a thickness of 1 μm was prepared.
次に、この粉末に対し、シリコンオイル（粘度約５０ｃ
ｓ）が０．０．５．１．０．３．０．５．０．７．０
となるように、トルエンに溶解し、混合した。トルエ
ンを乾燥した後、これらシリコンオイル混合粉末を熱処
理した。Next, apply silicone oil (viscosity approximately 50c) to this powder.
s) is 0.0.5.1.0.3.0.5.0.7.0
It was dissolved in toluene and mixed so that After drying the toluene, these silicone oil mixed powders were heat-treated.
熱処理は、室温から空気巾約３００℃／ｈｒで４７０℃
まで昇温した後、１時間保持し、その後真空引きし、窒
素雰囲気とし５００℃、６００℃。Heat treatment is from room temperature to 470°C with an air width of approximately 300°C/hr.
After raising the temperature to 500°C, it was held for 1 hour and then evacuated to create a nitrogen atmosphere at 500°C and 600°C.
７００℃、８００℃、９００℃でそれぞれ２時間保持し
た後、急冷している。ただし、４００℃での熱処理は空
気中にて保持している。After being held at 700°C, 800°C, and 900°C for 2 hours each, it was rapidly cooled. However, the heat treatment at 400°C was maintained in air.
粉末の粒子の結着性を第１表に示す。The binding properties of the powder particles are shown in Table 1.
シリコンオイルを０．５ ｗｔ％以上混合した粉末では
９粒子の結着が明らかに低下した粉末となっている。The powder containing 0.5 wt% or more of silicone oil has a clearly reduced binding of 9 particles.
第１表
◎：粉末粒子の結着なし
○：粉末粒子がわずかに結着■砕容易）Ｘ：粉末粒子か
明らかに結着（解砕困難）実施例２
実施例１で得た５ｉ８ｖｔ％、残部Ｆｅからなる偏平状
粉末に、シリコンオイルが０．１．０．２．０゜３．０
．４．０．５．０．６．０．７．０ ′１ＩＩｔ％とな
るように２実施例１と同様にして混合した後、トルエン
を除去した。Table 1 ◎: No binding of powder particles ○: Slight binding of powder particles (■ Easy to crush) X: Powder particles clearly bound (difficult to crush) Example 2 5i8vt% obtained in Example 1, Silicone oil is added to the flat powder with the remainder being Fe at 0.1.0.2.0°3.0
．． 4.0.5.0.6.0.7.0 '1IIt% After mixing in the same manner as in Example 1, toluene was removed.
次に、これら粉末を実施例１と同様にして。Next, these powders were treated in the same manner as in Example 1.
７００℃で２時間保持し熱処理した。Heat treatment was performed by holding at 700°C for 2 hours.
これら粉末に対し、液状のエポキシ樹脂を２ｖｔ％混合
した後、金型を使用して、約５００ｋｇ／ｃｊの圧力で
、一方向に加圧圧縮して約１３ｍｍの立方体の圧粉体を
得た。これら成形体内部の粉末粒子は、圧縮方向と直交
するように円板状粒子の板面が配向した。これら成形体
粒子の板面方向が磁化方向となるようにして磁気特性飽
和磁化４πＩ 。These powders were mixed with 2vt% of liquid epoxy resin, and then compressed in one direction at a pressure of about 500 kg/cj using a mold to obtain a cubic compact of about 13 mm. . In the powder particles inside these compacts, the plate surfaces of the disc-shaped particles were oriented perpendicular to the compression direction. The plate surface direction of these molded particles is set to be the magnetization direction, so that the magnetic property saturation magnetization is 4πI.
保持力ＩＨＣを測定した。Retention force IHC was measured.
その結果を第１図に示す。The results are shown in FIG.
図中、４πＩ は、粉末の占積率を１００％に換算した
値である。シリコンオイルの混合量増加に対し、、４π
Ｉ は顕著な減少は示さないが。In the figure, 4πI is a value obtained by converting the space factor of the powder to 100%. For increasing the amount of silicone oil mixed, 4π
Although I shows no significant decrease.
１Ｈｏは５ｖｔ％を越える領域から著しく増加している
。1Ho increases significantly from the region exceeding 5vt%.
したがって シリコンオイルの混合量が５ｖｔ％を越え
る領域では、軟磁気特性が著しく劣化することがわかる
。Therefore, it can be seen that in a region where the amount of silicone oil mixed exceeds 5vt%, the soft magnetic properties deteriorate significantly.
以上の実施例かられかるように、シリコンオイルを混合
することによるＦｅ−５ｉ系偏平化粉末の結着性阻止効
果は０．５ ｖｔ％以上で認められ、軟磁気特性の著し
い劣化は、５ｖｔ％を越える領域で認められることから
、シリコンオイ、ルの混合量は０．５〜５νｔ％の範囲
が有用であることがわかる。As can be seen from the above examples, the effect of inhibiting the binding of Fe-5i flattened powder by mixing silicone oil was observed at 0.5 vt% or more, and significant deterioration of the soft magnetic properties was observed at 5 vt%. %, it can be seen that a range of 0.5 to 5 νt % is useful for the mixing amount of silicone oil and lubricant.
尚１本実施例では、シリコンオイルとして粘度が５０ｃ
ｓのみのものを用いたものについて述べているが１本発
明の効果は最終的にはＳ ｉＯ２での被覆によるもので
あることから、いかなるシリコンオイルであってもその
効果が期待できることは明白である。In this example, the silicone oil has a viscosity of 50c.
Although we are talking about the use of silicone oil alone, the effect of the present invention is ultimately due to the coating with SiO2, so it is clear that any silicone oil can be expected to have the same effect. be.
また 偏平化粉末として８νｔ％Ｓｉ、残部Ｆｅの粉末
についてのみ述べたが１本発明はこれのみに限定される
ものでなく、ＦｅとＳｉを主成分として含有する粉末で
あれば適用できることは、当業者であれば容易に推測で
きるものである。Furthermore, although the flattened powder has only been described as a powder of 8vt% Si and the balance Fe, it is understood that the present invention is not limited to this, and can be applied to any powder containing Fe and Si as main components. This can be easily estimated by a person in the business.
また、熱処理における雰囲気調整も、金属粉末の酸化を
顕著に進行せずに、シリコンオイルからＳｉＯ２を生成
する方法であれば１本発明の範囲にあることは明白であ
る。Furthermore, it is clear that atmosphere adjustment during heat treatment is also within the scope of the present invention as long as it is a method of producing SiO2 from silicone oil without significantly advancing the oxidation of metal powder.
［発明の効果］
以上説明したように１本発明によれば１合金粉末にシリ
コンオイルを添加することで、熱処理工程においても、
粉末の結着がなく、後工程において粉砕及び解砕後の工
程が大幅に短縮できるので製造の容易な形状異方性軟磁
性合金粉末を提供することができる。[Effects of the Invention] As explained above, according to the present invention, by adding silicone oil to the alloy powder, even in the heat treatment process,
Since there is no powder binding and the subsequent steps after pulverization and crushing can be significantly shortened, it is possible to provide a shape-anisotropic soft magnetic alloy powder that is easy to manufacture.
第１図は実施例２における８ｖｔ％Ｓｉ、残部Ｆｅなる
組成の偏平状粉末に混合したシリコンオイル量と熱処理
した粉末の磁気特性（４πＩ 。
ＩＨＣ）との関係を示す図である。
２４−FIG. 1 is a diagram showing the relationship between the amount of silicone oil mixed in the flat powder having a composition of 8vt% Si and the balance Fe in Example 2 and the magnetic properties (4πI.IHC) of the heat-treated powder. 24-
Claims (1)
性粉末を製造する方法において，前記合金粉末を機械的
粉砕し，得られた合金粉末にシリコンオイルを０．５〜
５．０ｗｔ％混合した後，熱処理することを特徴とする
形状異方性軟磁性合金粉末の製造方法。1. In a method for producing ferromagnetic powder from an alloy containing Fe and Si as main components, the alloy powder is mechanically pulverized, and silicon oil is added to the obtained alloy powder in an amount of 0.5 to
A method for producing a shape-anisotropic soft magnetic alloy powder, which comprises mixing 5.0 wt% and then heat-treating the powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2093117A JP2939815B2 (en) | 1990-04-10 | 1990-04-10 | Method for producing shape-anisotropic soft magnetic alloy powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2093117A JP2939815B2 (en) | 1990-04-10 | 1990-04-10 | Method for producing shape-anisotropic soft magnetic alloy powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03291305A true JPH03291305A (en) | 1991-12-20 |
| JP2939815B2 JP2939815B2 (en) | 1999-08-25 |
Family
ID=14073578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2093117A Expired - Fee Related JP2939815B2 (en) | 1990-04-10 | 1990-04-10 | Method for producing shape-anisotropic soft magnetic alloy powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2939815B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5651841A (en) * | 1994-07-22 | 1997-07-29 | Tdk Corporation | Powder magnetic core |
| JPH09306715A (en) * | 1996-05-15 | 1997-11-28 | Tokin Corp | Electronic device and method of fabricating the same |
| CN116323747A (en) * | 2020-10-05 | 2023-06-23 | 住友电木株式会社 | Resin molding material, molded article, and method for producing the molded article |
-
1990
- 1990-04-10 JP JP2093117A patent/JP2939815B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5651841A (en) * | 1994-07-22 | 1997-07-29 | Tdk Corporation | Powder magnetic core |
| JPH09306715A (en) * | 1996-05-15 | 1997-11-28 | Tokin Corp | Electronic device and method of fabricating the same |
| CN116323747A (en) * | 2020-10-05 | 2023-06-23 | 住友电木株式会社 | Resin molding material, molded article, and method for producing the molded article |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2939815B2 (en) | 1999-08-25 |
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