JPS62247005A - Production of compacted metallic magnetic core - Google Patents
Production of compacted metallic magnetic coreInfo
- Publication number
- JPS62247005A JPS62247005A JP61089529A JP8952986A JPS62247005A JP S62247005 A JPS62247005 A JP S62247005A JP 61089529 A JP61089529 A JP 61089529A JP 8952986 A JP8952986 A JP 8952986A JP S62247005 A JPS62247005 A JP S62247005A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- magnetic core
- magnetic
- metal
- compacted
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000000843 powder Substances 0.000 claims abstract description 44
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000000576 coating method Methods 0.000 claims abstract description 10
- 239000011248 coating agent Substances 0.000 claims abstract description 9
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 3
- 239000000057 synthetic resin Substances 0.000 claims abstract description 3
- 239000011230 binding agent Substances 0.000 claims abstract 2
- 239000002184 metal Substances 0.000 claims description 16
- 229910052751 metal Inorganic materials 0.000 claims description 16
- 239000006247 magnetic powder Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims 2
- SCPYDCQAZCOKTP-UHFFFAOYSA-N silanol Chemical compound [SiH3]O SCPYDCQAZCOKTP-UHFFFAOYSA-N 0.000 claims 1
- 230000035699 permeability Effects 0.000 abstract description 20
- 239000002245 particle Substances 0.000 abstract description 11
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 abstract description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052681 coesite Inorganic materials 0.000 abstract description 4
- 229910052906 cristobalite Inorganic materials 0.000 abstract description 4
- 239000000377 silicon dioxide Substances 0.000 abstract description 4
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 4
- 229910052682 stishovite Inorganic materials 0.000 abstract description 4
- 229910052905 tridymite Inorganic materials 0.000 abstract description 4
- 239000000203 mixture Substances 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 235000019353 potassium silicate Nutrition 0.000 description 8
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 8
- 238000009413 insulation Methods 0.000 description 6
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- IJKVHSBPTUYDLN-UHFFFAOYSA-N dihydroxy(oxo)silane Chemical compound O[Si](O)=O IJKVHSBPTUYDLN-UHFFFAOYSA-N 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000002902 organometallic compounds Chemical class 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- 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、金属磁性粉末を加圧成形し、さらにこれを熱
処理してなる圧粉磁心の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a powder magnetic core by press-molding metal magnetic powder and further heat-treating the same.
従来、Ｆｅ−３Ｌ−Ａｌ系合金やＦｅ−Ｎｉ系合金など
高透磁率圧粉磁心の製造においては、粉末粒子間の絶縁
抵抗を大ならしめるために、金属粉末に無機絶縁物質と
して水ガラスなどを被覆処理する方法が一般的になされ
ている６通常これを圧粉成形後、熱処理した磁心の透磁
率は、Ｆ ｅ−Ｓ ｉ−Ａ ｌ系合金で８０−１００、
Ｆｅ−Ｎｉ系合金で１２０前後であり、またこれらの透
磁率が半減する周波数（以下限界周波数と呼称する）も
数ＭＩＩＺからＩＯＭＩＩＺ程度であった。Conventionally, in the production of high permeability powder magnetic cores such as Fe-3L-Al alloys and Fe-Ni alloys, in order to increase the insulation resistance between powder particles, inorganic insulating substances such as water glass are added to metal powder. Generally, the magnetic permeability of the magnetic core is 80-100 for Fe-S i-Al alloy, which is heat-treated after powder compacting.6
It is around 120 for Fe-Ni alloys, and the frequency at which the magnetic permeability is halved (hereinafter referred to as the limit frequency) is about several MIIZ to IOMIIZ.
しかしながら、近年電子機器の電源が従来のドロッパ一
方式から高効率のスイッチング電源へ切替りつつあり、
かつ駆動周波数が高くなる傾向にあることから、より高
透磁率で周波数特性の優れた圧粉磁心が求められる趨勢
にある。However, in recent years, power supplies for electronic devices have been switching from the conventional dropper type to high-efficiency switching power supplies.
In addition, since the driving frequency tends to become higher, there is a trend for powder magnetic cores with higher magnetic permeability and excellent frequency characteristics to be required.
透磁率をさらに引き上げるには熱処理温度を高めてやれ
ばよいが、しかしながら水ガラス質の耐熱性が不充分な
ために粒子間の絶縁抵抗を損ね、透磁率の周波数特性が
劣下することになる。逆に、透磁率の周波数特性を維持
すべく水ガラス量を増加すると透磁率が低下する。した
がって、水ガラス呈と熱処理温度を調整することによっ
て、透磁率と周波数特性の均衡をとるのが実情であった
。To further increase the magnetic permeability, it is possible to increase the heat treatment temperature, but the insufficient heat resistance of water glass impairs the insulation resistance between particles, resulting in a deterioration of the frequency characteristics of magnetic permeability. . Conversely, if the amount of water glass is increased in order to maintain the frequency characteristics of magnetic permeability, magnetic permeability decreases. Therefore, the current situation is to balance the magnetic permeability and frequency characteristics by adjusting the water glass properties and heat treatment temperature.
本発明は、以上の事情に鑑みてなされたもので。The present invention has been made in view of the above circumstances.
従来以上に粉末粒子間の高い絶縁抵抗、すなわち圧粉磁
心の高周波特性を改善するとともにより高い透磁率を有
する高性能な金属圧粉磁心を提供することを目的とする
。The object of the present invention is to improve the high insulation resistance between powder particles, that is, the high frequency characteristics of the powder magnetic core, and to provide a high-performance metal powder magnetic core that has higher magnetic permeability than ever before.
本発明は、金属磁性粉末の粒子表面を絶縁性酸化物を形
成し得る金属を含有する有機金属化合物で被覆処理し、
さらにこれを加熱して絶縁性金属酸化物被膜を生成させ
ることを特徴とする金属圧粉磁心の製造方法である。The present invention involves coating the particle surface of metal magnetic powder with an organometallic compound containing a metal capable of forming an insulating oxide,
This method of manufacturing a metal dust core is characterized in that the metal powder core is further heated to form an insulating metal oxide film.
本発明者は、従来の水ガラス質被膜が耐熱性に乏しいた
めに圧粉成形後の熱処理温度を高めて高透磁率化しよう
とすれば粒子間の絶縁抵抗が劣下することから、耐熱性
の高い絶縁性金属酸化物被膜を金属磁性粉末表面上に緻
密に造膜することが必要と認めた。すなわち、水ガラス
質の被膜は、Ｎａ２０−ｎＳｉｏ２よりなり、Ｎａ、Ｏ
の存在により粉末粒子間を結着させているが、逆にこの
ために耐熱性が低く実質上６００℃以上の熱処理を施す
とＦｅ−９ｉ−Ａｌ系合金およびＦｅ−Ｎｉ系合金とも
絶縁抵抗が劣下し、限界周波数がＭＩＩＺオーダーを下
用るため、４５０〜５５０℃の熱処理によって、透磁率
と周波数特性の均衡をとっているのが現状である。The present inventor discovered that conventional water glass coatings have poor heat resistance, and if an attempt is made to increase the heat treatment temperature after compaction to increase magnetic permeability, the insulation resistance between particles will deteriorate. It was recognized that it was necessary to form a highly insulating metal oxide film on the surface of the metal magnetic powder. That is, the water glass film is made of Na20-nSio2, and contains Na, O
The presence of these alloys binds the powder particles together, but on the other hand, they have low heat resistance, and when heat treated at temperatures above 600°C, the insulation resistance of both Fe-9i-Al and Fe-Ni alloys decreases. Since the limit frequency is below the MIIZ order, the current situation is to balance the magnetic permeability and frequency characteristics by heat treatment at 450 to 550°C.
本発明者らは、Ｎａ２Ｏを含まない耐熱性の高いＳｉ、
Ｏ，膜の造膜手法を種々検討した結果、粒子表面をテト
ラヒドロキシシラン Ｓ ｊ（ＯＨ） ４で被覆処理し
、さらにこれを加熱して得られたＳｉｏ２被膜が圧粉成
形時にも粒子間絶縁抵抗の劣下が少なく、成形性があり
引き続き施される熱処理の温度を上昇させて透磁率を高
めても周波数特性が劣下しないことを見出し１本発明を
なすに至った。The present inventors have discovered that Si, which has high heat resistance and does not contain Na2O,
As a result of examining various film-forming methods for the O, film, we found that the Sio2 film obtained by coating the particle surface with tetrahydroxysilane S j (OH) 4 and then heating it provides interparticle insulation even during powder compaction. The present inventors have discovered that there is little deterioration in resistance, good moldability, and that frequency characteristics do not deteriorate even if the temperature of subsequent heat treatment is raised to increase magnetic permeability, leading to the present invention.
テトラヒドロキシシラン（別名オルトケイ酸）は、アル
カリに可溶であるが、アルコール溶液として粉末に添加
処理した後、これを２００〜３００℃で加熱すると緻密
で耐熱性の高いＳｉｎ、被膜を得ることができる。この
他原理的には、このテトラヒドロキシシラン以外にＳｉ
に水酸基のついた化合物であれば同様の被膜を得ること
が可能である。たとえばメタケイ酸、メソ三ケイ酸、メ
ソ三ケイ酸。Tetrahydroxysilane (also known as orthosilicic acid) is soluble in alkali, but if it is added to powder as an alcohol solution and then heated at 200 to 300°C, it is possible to obtain a dense and highly heat-resistant Sin film. can. In principle, other than this tetrahydroxysilane, Si
It is possible to obtain a similar film using a compound having a hydroxyl group attached to it. For example, metasilicic acid, mesotrisilicate, mesotrisilicate.
メソ四ケイ酸等がある。Examples include mesotetrasilicic acid.
添加方法は、ヘンシェルミキサー、スーパーミキサー、
Ｖ型ブレンダー等を利用し上記アルコール溶液を添加、
湿式によって粉末表面を被覆する。Addition methods include Henschel mixer, super mixer,
Add the above alcohol solution using a V-type blender etc.
The powder surface is coated by wet coating.
これを２００〜３００℃に加熱して乾燥、脱水すると耐
熱性が高く緻密なＳｉｏ２被膜が容易に得られる。When this is heated to 200 to 300° C., dried, and dehydrated, a dense Sio2 film with high heat resistance can be easily obtained.
また、絶縁性Ｓ ｉ Ｏ２被膜のみでは成形しにくい場
合、たとえばやや粒度の粗いＦｅ−５Ｌ−Ａｌ系合金の
粉末の場合には、Ｓ ｉ Ｏ、被膜を造膜の後、該粉末
と合成樹脂を混合することによって成形性を上げ得ると
ともに、引き続く熱処理によって高い透磁率と周波数特
性が得られることも合わせて見出した。In addition, if it is difficult to mold with only an insulating SiO2 coating, for example, in the case of Fe-5L-Al alloy powder with slightly coarse grain size, after forming the SiO coating, the powder and synthetic resin may be formed. We have also discovered that moldability can be improved by mixing these materials, and that high magnetic permeability and frequency characteristics can be obtained by subsequent heat treatment.
以下、本発明の具体的内容を実施例に即してさらに説明
する。Hereinafter, the specific contents of the present invention will be further explained based on examples.
実施例Ｉ
Ｎｉ ８１％、Ｍｏ２％、Ｆｅ残部を主成分とする平均
粒度５５μｍの粉砕された合金粉末をひずみとり焼鈍し
た。この粉末を、テトラヒドロキシシランＳｉ（○Ｈ）
４のアルコール溶液中に浸漬した後、２５０℃にて加熱
して粉末表面にＳｉＯ２の被膜を生成せしめた。テトラ
ヒドロキシシランの添加量は、粉末の比表面積を測定す
ることにより、シランの最小被膜面積から計算されたシ
ラン単分子膜生成に必要な理論量の１．５倍の添加量と
した。この粉末をリング状に１５ｔｏｎ／ ａＪの圧力
で圧粉成形の後。Example I A pulverized alloy powder having an average particle size of 55 μm and consisting mainly of 81% Ni, 2% Mo, and the balance Fe was strain-relieved and annealed. This powder was mixed with tetrahydroxysilane Si (○H).
After immersing it in the alcohol solution of No. 4, it was heated at 250° C. to form a SiO2 film on the powder surface. The amount of tetrahydroxysilane added was 1.5 times the theoretical amount required to form a silane monomolecular film, which was calculated from the minimum coating area of silane by measuring the specific surface area of the powder. This powder was compacted into a ring shape at a pressure of 15 tons/aJ.
５００．７００．９００℃で熱処理した。Heat treatment was performed at 500.700.900°C.
このようにして得られた圧粉磁心のｌ０ＫＩＩＺにお１
づる透磁率μｅｌＯＫと、周波数特性の目安として、１
３ＭｌＩ２での透磁率とｌ０ＫＨ２での透磁率の比μｅ
１３Ｍ／７ｚｅｌＯＫとを表１に示す。1 in l0KIIZ of the powder magnetic core obtained in this way.
As a guideline for magnetic permeability μelOK and frequency characteristics, 1
Ratio μe of magnetic permeability at 3MlI2 and magnetic permeability at 10KH2
13M/7zelOK is shown in Table 1.
同時に比較例として同一粉末に従来方法の１％の水ガラ
スを被覆処理して１５ｔｏｎ／ａｎｔの圧力にて圧粉成
形した結果を合わせて示す。At the same time, as a comparative example, the results of coating the same powder with 1% water glass using a conventional method and compacting it at a pressure of 15 tons/ant are also shown.
表 １
これによれば、本発明の圧粉磁心は特に５００℃を越え
る高温の熱処理によってμｅｌＯＫを高め得るとともに
μｅ１３Ｍ／μｅｌＯＫの劣下がなく、従来の金属圧粉
磁心にない高い透磁率と周波数特性を有していることが
わかる。Table 1 According to this, the powder magnetic core of the present invention can increase μelOK by heat treatment at a high temperature exceeding 500°C, has no deterioration in μe13M/μelOK, and has high magnetic permeability and frequency not found in conventional metal powder magnetic cores. It can be seen that it has certain characteristics.
実施例２
Ｓｉ９．５％、 Ａｌ ５．５％、Ｆｅ残部を主成分と
する平均粒度８０μｍの粉砕された合金粉末をひずみと
り焼鈍した。この粉末を実施例１と全く同時に表面処理
した後、エポキシ樹脂を０．５％添加、均一に混合分散
させてから、成形圧２０ｔｏｎ／ ｃｉにて成形、熱処
理した。比較例として同一粉末に従来方法の１％の水ガ
ラスを被覆処理したものでμｅｌＯＫとμｅ１３Ｍ／μ
ｅｌＯＫを比較した。結果を表２に示す。Example 2 A pulverized alloy powder having an average particle size of 80 μm and containing 9.5% Si, 5.5% Al, and the balance Fe was strain-relieved and annealed. After this powder was surface-treated at the same time as in Example 1, 0.5% of epoxy resin was added, mixed and dispersed uniformly, and then molded and heat-treated at a molding pressure of 20 tons/ci. As a comparative example, the same powder was coated with 1% water glass using the conventional method, and μelOK and μe13M/μ
elOK was compared. The results are shown in Table 2.
表 ２
これによれば、本発明のＦｅ−８ｉ−Ａｌ系合金圧粉磁
心は、従来圧粉磁心に比べμｅｌＯｋが高く、特に１３
Ｍ／μｅｌＯＫが非常に安定しており周波数特性が従来
になく優れていることがわかる。Table 2 According to this, the Fe-8i-Al alloy powder magnetic core of the present invention has a higher μelOk than the conventional powder magnetic core, especially 13
It can be seen that M/μelOK is very stable and the frequency characteristics are better than ever.
実施例としてはＦｅ−Ｎｉ、Ｆｅ−８ｉ−Ａ１合金をあ
げたが、これ以外に純鉄、Ｓｉ ０．５〜８％を含有す
るＦｅ−５ｉ合金等にも当然本発明が適用できる。Although Fe-Ni and Fe-8i-A1 alloys have been given as examples, the present invention can of course be applied to pure iron, Fe-5i alloy containing 0.5 to 8% Si, and the like.
以上から明らかなように本発明の金属圧粉磁心の製造法
によれば、従来になく高い透磁率と周波数特性に優れた
高性能圧粉磁心を得ることができ、その工業的価値が大
である。As is clear from the above, according to the manufacturing method of the metal powder magnetic core of the present invention, a high-performance powder magnetic core with unprecedentedly high magnetic permeability and excellent frequency characteristics can be obtained, and its industrial value is great. be.
Claims (1)
後、該粉末を加圧成形し、熱処理してなる金属圧粉磁心
の製造方法において、粉末の表面をテトラヒドロキシシ
ランＳｉ（ＯＨ）＿４にて被覆処理した後、さらにこれ
を加熱してＳｉＯ＿２被膜を生成せしめることを特徴と
する金属圧粉磁心の製造方法。 ２ 金属磁性粉末の表面を無機絶縁物質で被覆し、然る
後、該粉末を加圧成形し、熱処理してなる金属圧粉磁心
の製造方法において、粉末の表面をテトラヒドロキシシ
ランＳｉ（ＯＨ）＿４にて被覆処理し、さらにこれを加
熱してＳｉＯ＿２被膜を生成せしめた後、該粉末に結着
剤としての合成樹脂を混合してから加圧成形、熱処理し
てなる金属圧粉磁心の製造方法。[Claims] 1. A method for manufacturing a metal powder magnetic core in which the surface of a metal magnetic powder is coated with an inorganic insulating material, and then the powder is pressure-molded and heat treated. A method for producing a metal powder magnetic core, which comprises coating with hydroxysilane Si(OH)_4 and then further heating it to form a SiO_2 film. 2. A method for producing a metal powder magnetic core in which the surface of a metal magnetic powder is coated with an inorganic insulating material, and then the powder is pressure-molded and heat-treated. Production of a metal powder magnetic core, which is coated with _4, further heated to form a SiO_2 film, and then a synthetic resin as a binder is mixed with the powder, followed by pressure molding and heat treatment. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61089529A JPS62247005A (en) | 1986-04-18 | 1986-04-18 | Production of compacted metallic magnetic core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61089529A JPS62247005A (en) | 1986-04-18 | 1986-04-18 | Production of compacted metallic magnetic core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62247005A true JPS62247005A (en) | 1987-10-28 |
Family
ID=13973336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61089529A Pending JPS62247005A (en) | 1986-04-18 | 1986-04-18 | Production of compacted metallic magnetic core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62247005A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5651841A (en) * | 1994-07-22 | 1997-07-29 | Tdk Corporation | Powder magnetic core |
| JP2007254768A (en) * | 2006-03-20 | 2007-10-04 | Aisin Seiki Co Ltd | Soft magnetic powder material, its production method, soft magnetic compact and its production method |
| US7422697B2 (en) | 2003-10-03 | 2008-09-09 | Matsushita Electric Industrial Co., Ltd. | Composite sintered magnetic material, its manufacturing method, and magnetic element using composite sintered magnetic material |
| WO2008136383A1 (en) * | 2007-04-26 | 2008-11-13 | Toho Zinc Co., Ltd. | Winding inductor and process for manufacturing the same |
| JP2010043361A (en) * | 2009-11-16 | 2010-02-25 | Jfe Steel Corp | Soft magnetic metallic powder for dust core and dust core |
| CN112086257A (en) * | 2019-10-24 | 2020-12-15 | 中国科学院宁波材料技术与工程研究所 | Magnetic powder core with high magnetic conductivity and high quality factor and preparation method and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS599101A (en) * | 1982-07-06 | 1984-01-18 | Dainippon Ink & Chem Inc | Rare earth magnetic powder applied with surface treatment and its production |
| JPS60154502A (en) * | 1984-01-24 | 1985-08-14 | Ube Ind Ltd | Method for stabilizing magnetic metal powder |
| JPS61154111A (en) * | 1984-12-27 | 1986-07-12 | Toshiba Corp | Iron core and manufacture thereof |
-
1986
- 1986-04-18 JP JP61089529A patent/JPS62247005A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS599101A (en) * | 1982-07-06 | 1984-01-18 | Dainippon Ink & Chem Inc | Rare earth magnetic powder applied with surface treatment and its production |
| JPS60154502A (en) * | 1984-01-24 | 1985-08-14 | Ube Ind Ltd | Method for stabilizing magnetic metal powder |
| JPS61154111A (en) * | 1984-12-27 | 1986-07-12 | Toshiba Corp | Iron core and manufacture thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5651841A (en) * | 1994-07-22 | 1997-07-29 | Tdk Corporation | Powder magnetic core |
| US7422697B2 (en) | 2003-10-03 | 2008-09-09 | Matsushita Electric Industrial Co., Ltd. | Composite sintered magnetic material, its manufacturing method, and magnetic element using composite sintered magnetic material |
| JP2007254768A (en) * | 2006-03-20 | 2007-10-04 | Aisin Seiki Co Ltd | Soft magnetic powder material, its production method, soft magnetic compact and its production method |
| WO2008136383A1 (en) * | 2007-04-26 | 2008-11-13 | Toho Zinc Co., Ltd. | Winding inductor and process for manufacturing the same |
| JP2010043361A (en) * | 2009-11-16 | 2010-02-25 | Jfe Steel Corp | Soft magnetic metallic powder for dust core and dust core |
| CN112086257A (en) * | 2019-10-24 | 2020-12-15 | 中国科学院宁波材料技术与工程研究所 | Magnetic powder core with high magnetic conductivity and high quality factor and preparation method and application thereof |
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