JPS63248105A - Dust core and manufacture thereof - Google Patents
Dust core and manufacture thereofInfo
- Publication number
- JPS63248105A JPS63248105A JP62082635A JP8263587A JPS63248105A JP S63248105 A JPS63248105 A JP S63248105A JP 62082635 A JP62082635 A JP 62082635A JP 8263587 A JP8263587 A JP 8263587A JP S63248105 A JPS63248105 A JP S63248105A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- film
- ladder
- metal magnetic
- silicone oligomer
- 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 8
- 239000000428 dust Substances 0.000 title abstract 2
- 239000000843 powder Substances 0.000 claims abstract description 85
- 239000002184 metal Substances 0.000 claims abstract description 57
- 229910052751 metal Inorganic materials 0.000 claims abstract description 57
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical compound [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 8
- 229920001296 polysiloxane Polymers 0.000 claims description 39
- 239000007822 coupling agent Substances 0.000 claims description 13
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 12
- 239000012212 insulator Substances 0.000 claims description 2
- 229910003271 Ni-Fe Inorganic materials 0.000 claims 1
- 239000006247 magnetic powder Substances 0.000 abstract description 53
- 238000000137 annealing Methods 0.000 abstract description 19
- 229910000889 permalloy Inorganic materials 0.000 abstract description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 4
- 229910052710 silicon Inorganic materials 0.000 abstract 4
- 239000010703 silicon Substances 0.000 abstract 4
- 238000003825 pressing Methods 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 38
- 238000009413 insulation Methods 0.000 description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 13
- 230000035699 permeability Effects 0.000 description 9
- 239000011810 insulating material Substances 0.000 description 8
- 239000003822 epoxy resin Substances 0.000 description 7
- 238000000465 moulding Methods 0.000 description 7
- 229920000647 polyepoxide Polymers 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 5
- 239000002923 metal particle Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 3
- 238000010292 electrical insulation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000702 sendust Inorganic materials 0.000 description 2
- -1 4-malloy Inorganic materials 0.000 description 1
- 235000016999 Ribes cereum Nutrition 0.000 description 1
- 240000004926 Ribes cereum Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 229920005573 silicon-containing polymer Polymers 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
【発明の詳細な説明】 ［発明の目的コ （産業上の利用分野） 本発明は圧粉磁心およびその製造方法に関する。[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a powder magnetic core and a method for manufacturing the same.
（従来の技術）
高周波用、例えばスイッチング電源の平滑化チラークコ
イルとして用りられる圧粉磁心は、高透磁率を持つ磁性
金属からなる金属磁性粉末に絶縁処理を施して金属磁性
粉末の各粒子の表面に絶縁被膜を形成し、この金属磁性
粉末を所要の形状に加圧成形して製作したものである。(Prior art) A powder magnetic core used for high frequencies, for example as a smoothing chiller coil in a switching power supply, is made by applying insulation treatment to metal magnetic powder made of a magnetic metal with high magnetic permeability, and then applying an insulation treatment to the surface of each particle of the metal magnetic powder. An insulating coating is formed on the metal magnetic powder, and the metal magnetic powder is press-molded into the desired shape.
つまシ、磁性材料のうず電流は周波数の二乗に比例して
増大するので、各粉末粒子の表面に層間絶縁用の絶縁Ｍ
を形成して渦電流の発生を抑制するようにした金属磁性
粉末を用いて圧粉磁心を製作している。Since the eddy current of magnetic materials increases in proportion to the square of the frequency, an insulator M for interlayer insulation is provided on the surface of each powder particle.
A powder magnetic core is manufactured using metal magnetic powder that is formed to suppress the generation of eddy currents.
また圧粉磁心に要求される高磁束密度、高透磁率を満足
させるために、金属磁性粉の充填密度を高める方法とし
て、絶縁物を被膜化し、絶縁物の量を減少させる方法が
ある。このために被膜化の可能な絶縁物質としてエポキ
シ樹脂を使用した圧粉磁心がある。In addition, in order to satisfy the high magnetic flux density and high magnetic permeability required of powder magnetic cores, there is a method of increasing the packing density of metal magnetic powder by forming an insulating material into a film to reduce the amount of the insulating material. For this purpose, there are powder magnetic cores that use epoxy resin as an insulating material that can be formed into a film.
（発明が解決しよ５さする問題点）
圧粉磁心において、金属磁性粉の充填密度を高めるため
金属磁性粉中の絶縁物質の量を減少させると、絶縁物質
の延展性、強度が十分でない場合、層間絶縁性が劣化し
周波数特性が悪化してしまう。このため、よシ高い充填
密度を得るためにはエポキシ樹脂以上に被膜を薄くしか
つ強固にできる絶縁材を用いる必要がある。(Problems to be solved by the invention) In powder magnetic cores, when the amount of insulating material in the metal magnetic powder is reduced in order to increase the packing density of the metal magnetic powder, the ductility and strength of the insulating material are insufficient. In this case, the interlayer insulation deteriorates and the frequency characteristics deteriorate. Therefore, in order to obtain a higher packing density, it is necessary to use an insulating material that can make the coating thinner and stronger than epoxy resin.
また、圧粉磁心を製作するに際しては、加圧成形によシ
金属磁性粉末に加工歪みが発生するので、この金属磁性
粉末に発生する加工歪みを取除き磁気特性を向上させる
ために、加圧成形後に成形体に歪み取り焼鈍を行なうこ
とが好ましい。そして、この歪み取シ焼鈍において成形
体（金属磁性粉末）に対する焼鈍温度は、金属磁性粉末
を形成する磁性金属の特性に応じて約り００℃〜９００
℃程度が必要である。In addition, when manufacturing powder magnetic cores, processing distortion occurs in the metal magnetic powder due to pressure forming, so in order to remove processing distortion that occurs in the metal magnetic powder and improve magnetic properties It is preferable to subject the molded body to strain relief annealing after molding. In this strain relief annealing, the annealing temperature for the compact (metal magnetic powder) is approximately 00°C to 900°C depending on the characteristics of the magnetic metal forming the metal magnetic powder.
A temperature of about ℃ is required.
しかしながら、エポキシ樹脂の耐熱温度は前記したよう
に成形体に対して行なう歪み取り焼鈍の焼鈍温度である
３００℃以上に比してかなシ低温である２００℃であり
、前記金属磁性粉末からなる成形体を３００℃以上で加
熱すると、エポキシ樹脂の特性が劣化して金属磁性粉中
の粒子の絶縁膜を形成できなくなる。このため、金属磁
性粉末粒子にエポキシ樹脂膜を形成した金属磁性粉末を
用いて圧粉磁心を製作する場合には、成形体に対して４
００℃程度以上の温度で歪取勺焼鈍を施して、成形体に
歪取Ｉ）焼鈍を行なって磁気特性を改善することができ
ない。すなわち、歪み取シ焼釧により磁気特性を改善し
た圧粉磁心を得ることができない。However, as mentioned above, the heat resistance temperature of the epoxy resin is 200°C, which is much lower than the annealing temperature of 300°C or more for strain relief annealing performed on the molded body, and the molding made of the metal magnetic powder If the body is heated above 300° C., the properties of the epoxy resin will deteriorate and the particles in the metal magnetic powder will no longer be able to form an insulating film. For this reason, when manufacturing a powder magnetic core using metal magnetic powder particles with an epoxy resin film formed on them, it is necessary to
It is not possible to improve the magnetic properties by performing strain relief annealing on a compact at a temperature of approximately 00° C. or higher. That is, it is not possible to obtain a powder magnetic core with improved magnetic properties by using the strain-reducing sintering method.
本発明は前記事情に基づいてなされたもので、絶縁膜を
十分に薄くかつ強固にすることのできる絶縁材を用いて
金属磁性粉粒子に絶縁膜を形成し、歪み取シ焼鈍の焼鈍
温度と同じ高い耐熱温度金持つ絶ＲＭを粉末粒子に形成
し、歪み取シ焼鈍によシ磁気特性を向上させた圧粉磁心
およびその製造方法を提供することを目的とする。The present invention has been made based on the above-mentioned circumstances, and involves forming an insulating film on metal magnetic powder particles using an insulating material that can make the insulating film sufficiently thin and strong, and adjusting the annealing temperature for strain relief annealing. The object of the present invention is to provide a powder magnetic core in which magnetic properties are improved by forming powder particles with an absolute RM having the same high temperature resistance as metal, and by annealing to remove strain, and a method for manufacturing the same.
［発明の構成］
（問題点を解決するための手段と作用）前記目的を達成
するために本発明の圧粉磁心は、金属磁性粉末と、この
金属磁性粉末粒子の表面を覆うラダー型シリコーン系オ
リゴマー膜、又はさらに好ましくはこのラダー型シリコ
ーン系オリゴマー膜と前記金属磁性粉末の両方の物質と
の濡れ性が良好なカップリング剤とからなる金属磁性粉
末を加圧して成形してなることを特徴とするものである
。[Structure of the Invention] (Means and Effects for Solving the Problems) In order to achieve the above object, the powder magnetic core of the present invention includes a metal magnetic powder and a ladder-type silicone-based material covering the surface of the metal magnetic powder particles. It is characterized in that it is formed by pressurizing and molding an oligomer film, or more preferably, a metal magnetic powder consisting of a coupling agent that has good wettability with both substances of the ladder-type silicone oligomer film and the metal magnetic powder. That is.
さらに、本発明の製造方法は、ラダー型シリコーンオリ
ゴマーを金属粉末にコーティングし、それを圧粉した成
形体を４００℃以上、好ましくは５００℃以上に加熱す
ることを特徴とするものである。Further, the manufacturing method of the present invention is characterized in that a metal powder is coated with a ladder-type silicone oligomer, and a molded product obtained by compacting the same is heated to 400° C. or higher, preferably 500° C. or higher.
本発明の発明者は圧粉磁心に用いる金属磁性粉末におい
て粉末粒子に形成する絶縁材料について徨々研究を重ね
てきた。この結果、金属磁性粉末の粒子の表面に形成す
る絶縁膜の材料として、絶縁性および耐熱温度の面から
ラダー型シリコーン系オリコ９マー、又はそれが加熱に
より変質したものが適していることを見出した。すなわ
ち、適切なコーティング法を用いれば絶縁性が良いため
す、でに金属磁性粉末の透磁率が高囚ので圧粉しただけ
で良好な高周波特性を持つ圧粉磁心を見出した。The inventor of the present invention has conducted extensive research on insulating materials formed in powder particles in metal magnetic powder used in powder magnetic cores. As a result, we found that ladder-type silicone-based Orico-9mer, or a material modified by heating, is suitable as a material for the insulating film formed on the surface of metal magnetic powder particles, from the standpoint of insulation and heat resistance. Ta. In other words, if an appropriate coating method is used, the insulation properties will be good.Since the magnetic permeability of metal magnetic powder is already high, we found a powder magnetic core with good high-frequency characteristics by simply compacting the powder.
さらに、鉄損を下げるために加熱した場合、エポキシ樹
脂の耐熱性限界の２００℃はもちろんのこと、一般的に
ラダー型シリコーン系オリゴマーの耐熱限界とされてい
る４００℃を上回る温度で焼鈍しても圧粉磁心の高周波
％性を良好に保つために必要な絶縁性が保たれているこ
とを見出した。Furthermore, when heating is performed to reduce core loss, it is annealed not only at 200°C, which is the heat resistance limit of epoxy resin, but also at a temperature that exceeds 400°C, which is generally considered the heat resistance limit of ladder-type silicone oligomers. It was also found that the insulation required to maintain good high frequency performance of the powder magnetic core was maintained.
このため、粉末粒子に絶縁膜としてラダー型シリコーン
系オリゴマー膜を形成した金属磁性粉末を圧粉し、その
成形体を歪み取シ焼鈍（焼鈍温度４００℃以上好ましく
は５００℃以上さらに好ましくは５５０℃以上）を行い
、磁気特性を改善した圧粉磁心を得ることが可能となる
。For this purpose, metal magnetic powder in which a ladder-type silicone oligomer film is formed as an insulating film on the powder particles is compacted, and the compact is annealed to remove strain (annealing temperature: 400°C or higher, preferably 500°C or higher, more preferably 550°C). By doing the above), it becomes possible to obtain a powder magnetic core with improved magnetic properties.
一方、金属磁性粉末の粉末粒子に絶縁膜を形成する場合
には、粉末粒子の表面全体に絶縁膜を均一に強固に形成
することが重要である。発明者は次に金属磁性粉末の粉
末粒子に２グーシリコーンオリゴマー膜を形成する場合
に、この点について観察を行なった。この結果、ラダー
シリコーンオリゴマーは金属磁性粉末の粉末粒子に対し
てぬれ性が悪くて粉末粒子の表面に部分的に不均一に付
着し、粉末粒子の表面でラダーシリコーンオリゴマー膜
で覆われず露出する部分が生ずることが分った。このま
までは、粉末粒子同士が接触するときに、粉末粒子のラ
ダーシリコーンオリゴマー膜で覆われない部分が相互に
接触して層間絶縁が図れないことが分った。On the other hand, when forming an insulating film on powder particles of metal magnetic powder, it is important to form the insulating film uniformly and firmly over the entire surface of the powder particles. The inventor next observed this point when forming a 2-goo silicone oligomer film on powder particles of metal magnetic powder. As a result, the ladder silicone oligomer has poor wettability with the powder particles of the metal magnetic powder and is partially non-uniformly attached to the surface of the powder particle, leaving the surface of the powder particle exposed without being covered with the ladder silicone oligomer film. It was found that some parts occur. It was found that if the powder particles were left in this state, when the powder particles came into contact with each other, the portions of the powder particles that were not covered with the ladder silicone oligomer film would come into contact with each other, making it impossible to achieve interlayer insulation.
そこで、発明者は金属磁性粉末の粉末粒子の表面全体に
ラダーシリコーンオリゴマー膜を均−且つ強固に形成す
ることについて研究を重ねた。この結果、金属磁性粉末
の粉末粒子と２ダーシリコーンオリゴマーの両方に夫々
ぬれ性の良い物質からなるカップリング剤を用いて両者
を結合することに着目した。すなわち、金属磁性粉末の
粉末粒子の表面に、金属磁性粉末とラダーシリコーンオ
リゴマーの両方にぬれ性の良い物質からなるカップリン
グ剤膜を形成し、このカップリング剤膜の表面にラダー
シリコーンオリがマー膜を形成することＫよシ、粉末粒
子の表面全体にラダーシリコーンオリゴマー膜を均−且
つ強固に形成できることが分った。そして、このカップ
リング剤としてはシラン系カップリング剤その中でも特
にアミノシランが最も適していることも見出した。Therefore, the inventors conducted repeated research on forming a ladder silicone oligomer film uniformly and firmly over the entire surface of powder particles of metal magnetic powder. As a result, we focused on bonding the powder particles of the metal magnetic powder and the two-dimensional silicone oligomer by using a coupling agent made of a substance with good wettability, respectively. That is, a coupling agent film made of a substance that has good wettability with both the metal magnetic powder and the ladder silicone oligomer is formed on the surface of the powder particles of the metal magnetic powder, and the ladder silicone oligomer is formed on the surface of this coupling agent film. In addition to forming a film, it was found that a ladder silicone oligomer film could be formed uniformly and firmly over the entire surface of the powder particles. It has also been found that among silane coupling agents, aminosilane is particularly suitable as this coupling agent.
従って、この特性を有するカップリング剤を用いること
によシ、金属磁性粉末の粉末粒子の表面に絶縁性および
耐熱性に優れたラダーシリコーンオリがマー膜を絶Ｒ膜
として形成することが可能になる。Therefore, by using a coupling agent having this property, it is possible to form a ladder silicone polymer film with excellent insulation and heat resistance on the surface of the metal magnetic powder particles as an absolute R film. Become.
本発明はこの知見に基づいてなされたものである。The present invention has been made based on this knowledge.
本発明の圧粉磁心に用いる金属磁性粉末について説明す
る。The metal magnetic powder used in the powder magnetic core of the present invention will be explained.
金属磁性粉末には高透磁率を持つ磁性金属を用いる。具
体的には、純鉄、ノ４−マロイ、センダストが挙げられ
る。Δ−マロイとして適する組成は、重量比でＮｉ約８
０％−Ｆｅ、Ｎｉ４５〜５０Ｌ−Ｆｅである。また、８
０チＮｉ ｐ４−マロイに電気比抵抗を改善するために
Ｍｅ、 Ｃｒ５Ｃｕ、 Ｍｎなどを所定量添加してもよ
い。ノヤーマロイは特に高い透磁率を有するが、外力に
よシ歪みを生じ易く歪み取り焼鈍を必要とするので、本
発明の圧粉磁心に用いる金属磁性粉末として適している
。センダストは例えば、８１９．５％−Ａｔ５．４％−
残部Ｆｅからなるものである。A magnetic metal with high magnetic permeability is used for the metal magnetic powder. Specific examples include pure iron, 4-malloy, and sendust. A suitable composition for Δ-malloy is about 8 Ni by weight.
0%-Fe, Ni45-50L-Fe. Also, 8
A predetermined amount of Me, Cr5Cu, Mn, etc. may be added to the 0-chi Ni p4-malloy to improve the electrical resistivity. Although Noyermalloy has particularly high magnetic permeability, it is easily strained by external forces and requires strain relief annealing, so it is suitable as the metal magnetic powder used in the powder magnetic core of the present invention. For example, Sendust is 819.5%-At5.4%-
The remainder consists of Fe.
金属磁性粉末の各粉末粒子の表面には、この粉末粒子と
ラダーシリコーンオリゴマーの両方に濡れ性に良い物質
からなるカップリング剤の膜が形成され、このカップリ
ング剤膜の表面に２ダーシリコーンオリゴマーからなる
絶縁膜が形成しである。On the surface of each powder particle of the metal magnetic powder, a film of a coupling agent made of a substance that has good wettability for both the powder particles and the ladder silicone oligomer is formed, and on the surface of this coupling agent film, a layer of the ladder silicone oligomer is formed. An insulating film consisting of is formed.
金属磁性粉末とラダーシリコーンオリゴマーの両方にぬ
れ性の良いカップリング剤としては、シランカップリン
グ剤が最も適しておシ、粉末粒子の表面全体にシランカ
ップリング剤の膜が均−且つ強固に形成できる。シラン
カップリング剤としては、アミノシラン、工４キシシラ
ンが挙げられる。A silane coupling agent is most suitable as a coupling agent that has good wettability for both metal magnetic powder and ladder silicone oligomer, and forms a film of the silane coupling agent uniformly and firmly on the entire surface of the powder particles. can. Examples of the silane coupling agent include aminosilane and 4-xysilane.
金属磁性粉末の粉末粒子の表面にシランカップリング剤
の膜を形成するのは、粉末粒子にラダーシリコーンオリ
ゴマー膜を形成する前に前処理として行なう。この場合
、粉末粒子の表面にラダーシリコーンオリゴマー膜を均
−且つ強固に接着させるために効果的な手段を採用して
行なうことが好ましい。カップリング剤としてアミノシ
ランを用いる場合には、アミノシランに加水分解を経過
させて粉末粒子の表面に接着させる。この方法では、ア
ミノシランＹＲ８ＩＸ５が加水分解によすＹＢ２ ｌ（
ＯＨ）３となｆｉ、ＯＨが粉末粒子と結合するとともに
、アミノシラン相互を結合する。これにより粉末粒子の
表面全体にアミノシランの膜が均−且つ強固に形成でき
る。また、他のエポキシシランを用いる場合にもアミノ
シランと同様の方法を採用する。Forming a film of a silane coupling agent on the surface of powder particles of metal magnetic powder is performed as a pretreatment before forming a ladder silicone oligomer film on the powder particles. In this case, it is preferable to use an effective means for uniformly and firmly adhering the ladder silicone oligomer film to the surface of the powder particles. When aminosilane is used as a coupling agent, the aminosilane is hydrolyzed to adhere to the surface of the powder particles. In this method, aminosilane YR8IX5 undergoes hydrolysis of YB2 l(
OH)3 and fi, OH bond to the powder particles and bond the aminosilanes to each other. This allows a uniform and strong film of aminosilane to be formed over the entire surface of the powder particles. Furthermore, when using other epoxysilanes, the same method as for aminosilanes is adopted.
またシランカップリング剤を直接もしくは有機溶剤に分
散させて金属磁性粉末と混合し、加熱することで金属磁
性粉末表面に接着させることも可能である。It is also possible to bond the silane coupling agent to the surface of the metal magnetic powder by mixing the silane coupling agent directly or by dispersing it in an organic solvent and heating the mixture with the metal magnetic powder.
２ダーシリコーンオリゴマーは、前述したように金属磁
性粉末におけろうず電流の発生を抑制し粉末粒子の層間
絶縁を図るに充分な電気絶縁性を有し、且つ金属磁性粉
末を加圧成形してなる成形体を歪み取ル焼鈍するときの
焼鈍温度４００℃以上好ましくは５００℃以上と同じ高
さで絶縁性を有している。ラダーシリコーン−オリゴマ
ー膜ヲ形成する方法としては、７２ンカツプリング剤膜
を形成した金属磁性粉末を、ラダーシリコーンオリゴマ
ーを溶解したアルコール液に付ける方法がある。ラダー
シリコーンオリゴマーとシランカップリング剤とはぬれ
性が良いために、金属磁性粉末の粉末粒子に形成された
シランカップリング剤の膜の表面全体に、ラダーシリコ
ーンオリゴマー膜が均−且つ強固に形成される。シラン
カップリング剤として例えばアミノシランを用いた場合
には、アミノシランに含まれる有機官能基がラダーシリ
コーンオリゴマーの成分と結合することにより、アミノ
シラン膜の表面全体にラダーシリコーンオリゴマー膜が
均−且つ強固に形成できる。As mentioned above, the 2-d silicone oligomer has sufficient electrical insulation properties to suppress the generation of wax current in the metal magnetic powder and provide interlayer insulation between the powder particles. It has insulation properties at an annealing temperature of 400° C. or more, preferably 500° C. or more, when strain relief annealing is performed on a molded product. As a method for forming a ladder silicone-oligomer film, there is a method of attaching metal magnetic powder on which a 72-link coupling agent film has been formed to an alcohol solution in which a ladder silicone oligomer is dissolved. Since the ladder silicone oligomer and the silane coupling agent have good wettability, the ladder silicone oligomer film is formed evenly and firmly over the entire surface of the silane coupling agent film formed on the powder particles of the metal magnetic powder. Ru. For example, when aminosilane is used as the silane coupling agent, the organic functional groups contained in the aminosilane combine with the components of the ladder silicone oligomer, thereby forming a ladder silicone oligomer film uniformly and firmly over the entire surface of the aminosilane film. can.
また、粉末粒子にラダーシリコーンオリゴマー膜を形成
した後に、その強度を高めるために、金属磁性粉末に対
して熱処理を行なう。この熱処理によシラダーシリコー
ンオリゴマー膜が縮合反応して、ラダーシリコーンオリ
ゴマー膜自体の強度が高まるとともに、ラダーシリコー
ンオリゴマー膜と粉末粒子との接着強度が大幅に向上す
る。これによシラダーシリコーンオリゴマー膜は、金属
磁性粉末を加圧成形する時の外力によっても破壊するこ
とがない大きな強度を持つことが出来る。Further, after forming the ladder silicone oligomer film on the powder particles, the metal magnetic powder is subjected to heat treatment in order to increase its strength. This heat treatment causes a condensation reaction in the ladder silicone oligomer film, increasing the strength of the ladder silicone oligomer film itself, and significantly improving the adhesive strength between the ladder silicone oligomer film and the powder particles. As a result, the silada silicone oligomer film can have a high strength that will not be destroyed even by external force during pressure molding of metal magnetic powder.
このように金属磁性粉末は粉末粒子の表面に、高い電気
絶縁性と耐熱性を持ったラダーシリコーンオリゴマーか
らなる絶縁膜を強固に形成できる。In this way, the metal magnetic powder can firmly form an insulating film made of ladder silicone oligomer having high electrical insulation and heat resistance on the surface of the powder particles.
本発明はこの金属磁性粉末を材料として使用し、金属磁
性粉末を加圧して所定の圧粉磁心形状をなす成形体を成
形する。この加圧成形において、金属磁性粉末の粉末粒
子く形成されたラダーシリコーンオリゴマー膜は破壊さ
れることがない。従うてこのまま圧粉磁心としても有用
である。しかし、さらに特性を良くするために成形体に
対して加工歪みを塩９除くための焼鈍を行なう。この昇
温温度は４５０℃以上好ましくは５００℃以上である。In the present invention, this metal magnetic powder is used as a material, and the metal magnetic powder is pressed to form a compact having a predetermined powder magnetic core shape. In this pressure molding, the ladder silicone oligomer film formed on the metal magnetic powder particles is not destroyed. Therefore, the lever is also useful as a powder magnetic core. However, in order to further improve the properties, the molded body is annealed to remove the processing strain. This heating temperature is 450°C or higher, preferably 500°C or higher.
この焼鈍において、金属磁性粉末の粉末粒子に形成した
ラダーシリコーンオリゴマー膜は焼鈍の熱によシ絶縁性
が劣化することがない。In this annealing, the insulation properties of the ladder silicone oligomer film formed on the powder particles of the metal magnetic powder do not deteriorate due to the heat of annealing.
従りて、歪み取シ焼鈍を施して磁気特性、すなわち透磁
率の向上および鉄損の低下を図った圧粉磁心を得ること
ができる。また、得られた圧粉磁心は磁気特性を向上さ
せることによシ小形化を図ることが出来る。Therefore, it is possible to obtain a powder magnetic core that is subjected to strain relief annealing to improve magnetic properties, that is, magnetic permeability, and reduce iron loss. Further, the obtained powder magnetic core can be made smaller by improving its magnetic properties.
（実施例） 本発明の実施例について説明する。(Example) Examples of the present invention will be described.
金属磁性粉末として重量比でＮｉ８０％−残部Ｆｅから
なるノヤーマロイ粉末を用意し、このノ４？−マロイ粉
末に重量比で１％の７ミノシランを加えて時間約１５分
で加水分解を行ない、粉末粒子にアミノシラン膜を形成
した。次いで、ラダーシリコーンオリゴマーをアルコー
ルに溶解したものを用意し、このアルコール溶液に前処
理を終えたパーマロイ粉を入れて絶縁膜を形成する。こ
の処理によ＃）パーマロイ粉の粒子にラダーシリコーン
オリゴマー膜を形成した。その後に、ｍ度２００Ｃ１時
間３０分の条件でラダーシリコーンオリゴマーｇ。A Noyer Malloy powder consisting of 80% Ni and the balance Fe by weight was prepared as a metal magnetic powder. - 1% by weight of 7-minosilane was added to the malloy powder and hydrolyzed for about 15 minutes to form an aminosilane film on the powder particles. Next, a solution of ladder silicone oligomer in alcohol is prepared, and pretreated permalloy powder is added to this alcohol solution to form an insulating film. Through this treatment, a ladder silicone oligomer film was formed on the permalloy powder particles. After that, ladder silicone oligomer was heated at 200C for 1 hour and 30 minutes.
強度を高めるための熱処理を行なった。さらＫ、以上の
絶縁処理を行なった後１’ｉ：、ノ譬−マロイ粉末を成
形圧１２トン／ａｎで加圧してリング形の成形体を成形
した。最後に成形体に温度６００℃で焼鈍を施し圧粉磁
心を製作した。Heat treatment was performed to increase strength. After performing the above insulation treatment, the malloy powder was pressed at a molding pressure of 12 tons/an to form a ring-shaped molded product. Finally, the compact was annealed at a temperature of 600°C to produce a powder magnetic core.
比較例について説明する。A comparative example will be explained.
Ｎｉ ８０％−残部Ｆｅの組成のパーマロイ粉末と、１
％のエポキシ樹脂粉末とを混合して絶縁処理を行なった
０次にパーマロイ粉末を焼鈍を行なわずに成形圧１２ト
ン／ｃＩ１１２で加圧してリング形の成形体を成形し、
この成形体に２００℃、１時間の条件で熱処理を行ない
樹脂硬化を行なった。Permalloy powder with a composition of 80% Ni-balance Fe, and 1
% of epoxy resin powder and subjected to insulation treatment, the zero-order permalloy powder was pressurized at a molding pressure of 12 tons/cI112 without annealing to form a ring-shaped molded body,
This molded body was heat treated at 200° C. for 1 hour to cure the resin.
そして、本発明例の圧粉磁心と比較例の圧粉磁心の透磁
率と鉄損を夫々測定して比較した。この結果、比較例の
圧粉磁心の透磁率と鉄損を夫々１００とした場合、本発
明例の圧粉磁心の透磁率は２００チに増加し、鉄損は３
０チに低下した。Then, the magnetic permeability and core loss of the powder magnetic core of the present invention example and the powder magnetic core of the comparative example were measured and compared. As a result, when the magnetic permeability and iron loss of the powder magnetic core of the comparative example are each 100, the magnetic permeability of the powder magnetic core of the present invention example increases to 200, and the iron loss is 3.
It dropped to 0chi.
従って、本発明の圧粉磁心は比較例に比して磁気特性が
優れていることが分る。Therefore, it can be seen that the powder magnetic core of the present invention has superior magnetic properties as compared to the comparative example.
Ｃ発明の効果］
以上説明したように本発明によれば、粉末粒子に電気的
絶縁性と耐熱性に優れ九絶縁膜を均−且つ強固に形成し
た金属磁性粉末を用いることにより、歪み取り焼鈍を行
ない磁気特性に優れた圧粉磁心を得ることができる。C. Effects of the Invention] As explained above, according to the present invention, by using a metal magnetic powder having excellent electrical insulation and heat resistance and evenly and firmly forming an insulating film on the powder particles, strain relief annealing is possible. By doing this, a powder magnetic core with excellent magnetic properties can be obtained.
Claims (6)
熱して変質した物質を絶縁物として用いることを特徴と
する圧粉磁心。(1) A powder magnetic core characterized in that a ladder-type silicone oligomer or a substance obtained by heating and altering it is used as an insulator.
熱して変質した物質は、これらと金属部との両方の物質
と濡れ性の良好なカップリング剤により接合されている
特許請求の範囲第１項に記載の圧粉磁心。(2) Claim 1, wherein the ladder-type silicone oligomer or a substance obtained by heating and altering it is bonded to both the substance and the metal part using a coupling agent that has good wettability. The powder magnetic core described in .
特許請求の範囲第２項記載の圧粉磁心。(3) The powder magnetic core according to claim 2, wherein the coupling agent is a silane coupling agent.
許請求の範囲第３項記載の圧粉磁心。(4) The powder magnetic core according to claim 3, wherein the silane coupling agent is aminosilane.
ーティングし、それを圧粉した成形体を４００℃以上、
好ましくは５００℃以上に加熱することを特徴とする圧
粉磁心の製造方法。(5) Ladder-type silicone oligomer is coated on metal powder, and a molded product obtained by compacting the powder is heated at 400°C or higher.
A method for producing a powder magnetic core, which preferably comprises heating to 500°C or higher.
する特許請求の範囲第５項に記載の圧粉磁心の製造方法
。(6) The method for manufacturing a powder magnetic core according to claim 5, wherein the metal powder is a Ni-Fe metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62082635A JPS63248105A (en) | 1987-04-03 | 1987-04-03 | Dust core and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62082635A JPS63248105A (en) | 1987-04-03 | 1987-04-03 | Dust core and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63248105A true JPS63248105A (en) | 1988-10-14 |
Family
ID=13779893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62082635A Pending JPS63248105A (en) | 1987-04-03 | 1987-04-03 | Dust core and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63248105A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008088505A (en) * | 2006-10-02 | 2008-04-17 | Toyota Central R&D Labs Inc | Insulating film, powder for magnetic core, powder magnetic core and method for forming them or method for producing them |
| JP2009059848A (en) * | 2007-08-31 | 2009-03-19 | Tamura Seisakusho Co Ltd | Core material, core using the same, and choke coil using the core |
| JP2013216921A (en) * | 2012-04-04 | 2013-10-24 | Sanyo Special Steel Co Ltd | Method for producing dust core powder |
-
1987
- 1987-04-03 JP JP62082635A patent/JPS63248105A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008088505A (en) * | 2006-10-02 | 2008-04-17 | Toyota Central R&D Labs Inc | Insulating film, powder for magnetic core, powder magnetic core and method for forming them or method for producing them |
| JP2009059848A (en) * | 2007-08-31 | 2009-03-19 | Tamura Seisakusho Co Ltd | Core material, core using the same, and choke coil using the core |
| JP2013216921A (en) * | 2012-04-04 | 2013-10-24 | Sanyo Special Steel Co Ltd | Method for producing dust core powder |
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