JPH11241102A - Production of magnetic alloy powder for core material - Google Patents
Production of magnetic alloy powder for core materialInfo
- Publication number
- JPH11241102A JPH11241102A JP10045849A JP4584998A JPH11241102A JP H11241102 A JPH11241102 A JP H11241102A JP 10045849 A JP10045849 A JP 10045849A JP 4584998 A JP4584998 A JP 4584998A JP H11241102 A JPH11241102 A JP H11241102A
- Authority
- JP
- Japan
- Prior art keywords
- alloy powder
- powder
- treatment
- magnetic flux
- flux density
- 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.)
- Withdrawn
Links
- 239000000843 powder Substances 0.000 title claims abstract description 48
- 239000011162 core material Substances 0.000 title claims description 10
- 229910001004 magnetic alloy Inorganic materials 0.000 title claims description 4
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 16
- 239000000956 alloy Substances 0.000 claims abstract description 16
- 238000004381 surface treatment Methods 0.000 claims abstract description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000001301 oxygen Substances 0.000 claims abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 229910002796 Si–Al Inorganic materials 0.000 claims abstract description 3
- 238000009689 gas atomisation Methods 0.000 claims abstract description 3
- 239000003929 acidic solution Substances 0.000 claims description 3
- 230000004907 flux Effects 0.000 abstract description 14
- 229910017082 Fe-Si Inorganic materials 0.000 abstract description 5
- 229910017133 Fe—Si Inorganic materials 0.000 abstract description 5
- 238000012856 packing Methods 0.000 abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 4
- 238000010306 acid treatment Methods 0.000 abstract description 3
- 230000001590 oxidative effect Effects 0.000 abstract description 3
- 239000002253 acid Substances 0.000 abstract description 2
- 229910000905 alloy phase Inorganic materials 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 2
- 239000000696 magnetic material Substances 0.000 description 14
- 239000002184 metal Substances 0.000 description 13
- 238000010438 heat treatment Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000009499 grossing Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910000702 sendust Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910001035 Soft ferrite Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、スイッチング電源
用トランスコア、平滑チョーク等のコア材に用いられる
磁性合金粉末に関し、特に高い飽和磁束密度と優れた高
周波特性を両立させることができるコア材用磁性合金粉
末の製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic alloy powder used for a core material such as a transformer core for a switching power supply and a smoothing choke, and more particularly to a core material capable of achieving both high saturation magnetic flux density and excellent high frequency characteristics. The present invention relates to a method for producing a magnetic alloy powder.
【０００２】[0002]
【従来の技術】近年、スイッチング電源用トランスコア
や平滑チョークなどの電子部品は、小型化、高性能化さ
れる傾向にあり、それに伴ってそれらのコア材に結合材
と共に使用される磁性材料粉末についても高性能化の要
求が高まっている。従来、コア材用に一般的に使用され
ている粉末として、Ｆｅ−Ｓｉ系合金やＦｅ−Ｓｉ−Ａ
ｌ系合金（センダスト）、酸化物磁性材料であるソフト
フェライトなどが知られている。2. Description of the Related Art In recent years, electronic components such as a transformer core for a switching power supply and a smoothing choke have tended to be miniaturized and improved in performance. Demands for higher performance have also increased. Conventionally, powders generally used for core materials include Fe-Si alloys and Fe-Si-A
An l-based alloy (Sendust), a soft ferrite as an oxide magnetic material, and the like are known.
【０００３】これらの磁性材料粉末の中で、Ｆｅ−Ｓｉ
系合金をはじめとする金属磁性材料は酸化物磁性材料に
比べて飽和磁束密度が高く、小型化の要求に応えられる
材料として期待されているが、コアに成形した場合は、
粉末同士の接触部分の電気電導率が高いため高周波特性
が悪くなる欠点があった。これは高周波領域で用いた場
合、過電流損失が増加することに起因する。[0003] Among these magnetic material powders, Fe-Si
Metal magnetic materials such as system alloys have higher saturation magnetic flux density than oxide magnetic materials and are expected to meet the demand for miniaturization, but when molded into a core,
There is a disadvantage that the high-frequency characteristics are deteriorated due to the high electric conductivity of the contact portion between the powders. This is due to an increase in overcurrent loss when used in a high frequency region.
【０００４】一方、酸化物系磁性材料は粉末同士の接触
部分の電気電導率が低く、金属系磁性材料に比べて高周
波特性は良好であるが、飽和磁束密度が低いために近年
の小型化、高性能化に対応できなくなっている。この欠
点は酸化物系磁性材料固有の性質によるものであり、根
本的な改善は不可能な範疇のものである。従って、部品
の小型化、高性能化に対応するには飽和磁束密度の高い
金属磁性材料を用い、粉末接触部分の電気電導率を下げ
て高周波特性を改善することが望まれている。さらに、
高い飽和磁束密度特性を有利にするために、粉末の充填
密度を増加させることが望まれている。これに対し、上
記目的を達成させることを目的として、金属粉末の表面
を熱処理によって酸化させる、金属粉末の表面に酸化物
系磁性材料を複合させるなどの工夫によって電気電導率
を下げる提案が、例えば特開平６−２０４０２１号公報
に開示されている。On the other hand, an oxide-based magnetic material has a low electric conductivity at a contact portion between powders and has a good high-frequency characteristic as compared with a metal-based magnetic material. It cannot support high performance. This disadvantage is due to the inherent properties of the oxide-based magnetic material, and is in a category where fundamental improvement is impossible. Therefore, in order to cope with miniaturization and high performance of parts, it is desired to use a metal magnetic material having a high saturation magnetic flux density and to lower the electric conductivity of the powder contact portion to improve high frequency characteristics. further,
It is desirable to increase the packing density of the powder in order to benefit from high saturation magnetic flux density characteristics. On the other hand, for the purpose of achieving the above object, a proposal to lower the electric conductivity by oxidizing the surface of the metal powder by heat treatment, or combining an oxide-based magnetic material with the surface of the metal powder, for example, It is disclosed in JP-A-6-202021.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、金属粉
末の表面を熱処理だけによって酸化させる方法による
と、熱処理温度の選択の仕方や時間によっては極表面に
電気電導率を下げる酸化皮膜を生じるだけでなく、その
内部にまで酸化物層が生成し、高い磁束密度を生じさせ
る金属相比率が減少するために、部品にした際の特性が
低下する危険がある。これは熱処理前の金属粉末表面の
一部が空気中の酸素などと反応し、部分的に酸化物や窒
化物を生じているために粉末の電気電導率を有効に下げ
る表面酸化の熱処理条件が一定でなく、熱処理温度を高
めにして処理時間も長めに設定する必要があることに起
因する。However, according to the method of oxidizing the surface of the metal powder only by heat treatment, depending on the method of selecting the heat treatment temperature and the time, not only an oxide film which lowers the electric conductivity on the surface of the metal powder, but also an oxide film is formed. Since the oxide layer is formed inside the metal layer and the ratio of the metal phase that causes a high magnetic flux density is reduced, there is a risk that the characteristics of the component may deteriorate. This is because heat treatment conditions for surface oxidation, which reduce the electrical conductivity of the powder effectively, because a part of the surface of the metal powder before heat treatment reacts with oxygen in the air and partially generates oxides and nitrides. This is because the heat treatment temperature is not constant and the treatment time needs to be set longer.
【０００６】また、粉末表面に酸化物系磁性材料を複合
させる方法によると、酸化物系磁性材料の複合比率が高
まるに従い高周波特性は改善されるが、金属粉末単体を
用いた場合に比べて部品としての磁束密度は低下するよ
うになるために、有効な解決手段とは言えない。本発明
の目的は、従来技術が抱える上述の問題点を解決し、ス
イッチング電源用トランスコアや平滑チョークの小型
化、高性能化に対応することを目的として、飽和磁束密
度と高周波特性の両方に優れた特性を示す磁性材料粉末
を提供することにある。According to the method of compounding an oxide-based magnetic material on the surface of a powder, high-frequency characteristics are improved as the composite ratio of the oxide-based magnetic material is increased. This is not an effective solution because the magnetic flux density as a result decreases. An object of the present invention is to solve both the above-mentioned problems of the conventional technology and to reduce the size and performance of a transformer core for a switching power supply and a smoothing choke, and to improve both the saturation magnetic flux density and the high-frequency characteristics. An object of the present invention is to provide a magnetic material powder exhibiting excellent characteristics.
【０００７】[0007]
【課題を解決するための手段】上述の目的を実現すべく
検討した結果、発明者らはＦｅ−Ｓｉ系合金やＦｅ−Ｓ
ｉ−Ａｌ系合金の粉末を攪拌機能の付いたミキサー中で
酸性溶液によって表面処理を施した後、酸素を含む雰囲
気中で熱処理することによって、金属系磁性材料が持つ
高い飽和磁束密度を維持したまま優れた高周波特性を実
現できることを見出した。さらに金属磁性材料として、
ガスアトマイズされた粉末を用いることによって、さら
に飽和磁束密度を高くできることを見出した。すなわ
ち、ガスアトマイズされた粉末はほぼ完全な球状になる
ため、粉末の充填密度が高くできるメリットがある。ま
た充填密度を高くしても、前述した処理を施すことによ
って、粉末表面の電気電導率は低く抑えられているた
め、優れた高周波特性が維持できるものである。As a result of investigations to achieve the above object, the present inventors have found that Fe--Si based alloys and Fe--S
The i-Al-based alloy powder was subjected to surface treatment with an acidic solution in a mixer equipped with a stirring function, and then heat-treated in an atmosphere containing oxygen to maintain a high saturation magnetic flux density of the metal-based magnetic material. It has been found that excellent high-frequency characteristics can be realized as it is. Furthermore, as a metal magnetic material,
It has been found that the saturation magnetic flux density can be further increased by using gas atomized powder. That is, since the gas-atomized powder becomes almost perfectly spherical, there is an advantage that the packing density of the powder can be increased. Even if the packing density is increased, the electric conductivity on the surface of the powder is kept low by performing the above-described treatment, so that excellent high-frequency characteristics can be maintained.
【０００８】[0008]
【発明の実施の形態】本発明の特徴は、Ｆｅ−Ｓｉ系ま
たはＦｅ−Ｓｉ−Ａｌ系合金粉末の表面を攪拌機能の付
いたミキサーで酸処理することによって、空気中の酸素
や窒素と反応した合金粉末表面の反応層を除去し、極め
てクリーンで均一な状態の金属面を生成する。酸処理後
のクリーンな金属面は極めて活性な状態にあり、表面処
理を施さない粉末に比べて低い温度、短い熱処理時間で
均質で極めて薄い酸化皮膜を形成する。このようなプロ
セスを施すことによって、合金相比率を下げることなく
表面だけに電気電導率の低い酸化層を作り出すことが可
能となる。さらに、このプロセスに用いる粉末として、
ガスアトマイズされた球状の粉末を使用することによっ
て、さらに粉末の充填密度を高めることができ、飽和磁
束密度を上昇させることが可能になる。DETAILED DESCRIPTION OF THE INVENTION The feature of the present invention is that the surface of Fe-Si or Fe-Si-Al alloy powder is treated with an acid by a mixer having a stirring function to react with oxygen or nitrogen in the air. The reaction layer on the surface of the alloy powder is removed, and a metal surface in an extremely clean and uniform state is generated. The clean metal surface after the acid treatment is in an extremely active state, and forms a uniform and extremely thin oxide film at a lower temperature and a shorter heat treatment time than a powder without surface treatment. By performing such a process, it is possible to create an oxide layer having low electric conductivity only on the surface without reducing the alloy phase ratio. In addition, as the powder used in this process,
By using the gas-atomized spherical powder, the packing density of the powder can be further increased, and the saturation magnetic flux density can be increased.
【０００９】[0009]
【実施例】センダスト合金成分（Ｆｅ−９．６％Ｓｉ−
５．４％Ａｌ）の粉末をＡｒガスアトマイズで作製し、
得られた粉末を−１０５μに分級した。分級後の粉末に
ついて、処理槽下部に回転翼を有するミキサー（三井鉱
山（株）製：ヘンシェルミキサー）に粉末と酸性溶液
（ｐＨ：１．０の塩酸水溶液）を重量比１対１で投入
し、回転翼の周速１０ｍ／ｓｅｃで攪拌させながら表面
処理を行った。ｐＨ変化が飽和した時点（ｐＨ：６．５
付近）で処理を終了し、純水で濾過洗浄した後、常温真
空中で乾燥させた。この表面処理粉末を大気中で５００
℃×１時間保持して表面に酸化皮膜処理を施した。Example: Sendust alloy component (Fe-9.6% Si-
5.4% Al) powder is produced by Ar gas atomization,
The obtained powder was classified to -105μ. About the powder after classification, the powder and an acidic solution (aqueous hydrochloric acid solution of pH: 1.0) are put into a mixer (Henschel mixer manufactured by Mitsui Mining Co., Ltd.) at a weight ratio of 1 to 1 having a rotor blade at the lower part of the treatment tank. The surface treatment was performed while stirring at a peripheral speed of the rotor of 10 m / sec. When the pH change is saturated (pH: 6.5
(In the vicinity), and the mixture was filtered and washed with pure water, and then dried in a vacuum at room temperature. This surface-treated powder is 500
The film was kept at 1 ° C. × 1 hour to perform an oxide film treatment on the surface.
【００１０】得られた粉末は粉末重量に対して１．５ｗ
ｔ％のシリコン系バインダーと０．５ｗｔ％の架橋剤を
加えて乳鉢で混合し、１０ｔ／ｃｍ2 の圧力でプレス成
形後、７００℃で熱処理を行ない、交流特性測定用のリ
ング試料を得た。また同時に比較用として、一連の表面
処理及び酸化皮膜処理を施さないアトマイズままの粉末
と表面処理を行わずに酸化皮膜処理だけを施した粉末に
ついても同様の手順でリング試料を作製し、その特性を
比較した。特性の指標として、１００ｋＨｚにおける交
流初透磁率を測定した。測定結果を表１に纏めて示す。
表１に示すように、表面処理及び酸化皮膜処理を施さな
いアトマイズままの粉末と表面処理を行わずに酸化皮膜
処理だけを施した粉末の比較例に比べて、本発明は、交
流初透磁率の極めて高いことが判る。The obtained powder has a weight of 1.5 w
A silicone-based binder (t%) and a crosslinking agent (0.5% by weight) were added, mixed in a mortar, press-molded at a pressure of 10 t / cm 2 , and then heat-treated at 700 ° C. to obtain a ring sample for measuring AC characteristics. . At the same time, for comparison, a ring sample was prepared in the same procedure for a series of surface-treated and as-atomized powders that were not subjected to the oxide film treatment and for powders that were subjected to the oxide film treatment without the surface treatment. Were compared. As an index of the characteristics, the AC initial permeability at 100 kHz was measured. The measurement results are summarized in Table 1.
As shown in Table 1, the present invention has a higher AC initial permeability than a comparative example of an as-atomized powder without surface treatment and oxide film treatment and a powder with only oxide film treatment without surface treatment. It can be seen that is extremely high.
【００１１】[0011]
【表１】 [Table 1]
【００１２】[0012]
【発明の効果】以上述べたように、本発明により、従来
法では両立が不可能であった高飽和磁束密度と高周波特
性が、高い飽和磁束密度と優れた高周波特性を両立させ
ることができるコア材への適用用途が広まり、工業上極
めて有利なものである。As described above, according to the present invention, a core capable of achieving both high saturation magnetic flux density and excellent high-frequency characteristics can be achieved with high saturation magnetic flux density and high-frequency characteristics which cannot be achieved by the conventional method. The application to materials is widespread, which is extremely advantageous industrially.
Claims (1)
Ｓｉ系合金またはＦｅ−Ｓｉ−Ａｌ系合金粉末につい
て、該粉末を攪拌機能の付いたミキサー中で酸性溶液に
よって表面処理を施した後、酸素を含む雰囲気中で熱処
理することを特徴とするコア材用磁性合金粉末の製造方
法。1. An Fe— produced by gas atomization.
A core material characterized by subjecting a Si-based alloy or Fe-Si-Al-based alloy powder to a surface treatment with an acidic solution in a mixer having a stirring function and then heat-treating the powder in an atmosphere containing oxygen. Production method of magnetic alloy powder for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10045849A JPH11241102A (en) | 1998-02-26 | 1998-02-26 | Production of magnetic alloy powder for core material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10045849A JPH11241102A (en) | 1998-02-26 | 1998-02-26 | Production of magnetic alloy powder for core material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11241102A true JPH11241102A (en) | 1999-09-07 |
Family
ID=12730670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10045849A Withdrawn JPH11241102A (en) | 1998-02-26 | 1998-02-26 | Production of magnetic alloy powder for core material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11241102A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002152300A (en) * | 2000-11-16 | 2002-05-24 | Nec Eng Ltd | Data transmission system and method |
| CN111112633A (en) * | 2020-01-15 | 2020-05-08 | 广东省焊接技术研究所（广东省中乌研究院） | Iron-silicon-aluminum metal powder and preparation method thereof |
-
1998
- 1998-02-26 JP JP10045849A patent/JPH11241102A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002152300A (en) * | 2000-11-16 | 2002-05-24 | Nec Eng Ltd | Data transmission system and method |
| CN111112633A (en) * | 2020-01-15 | 2020-05-08 | 广东省焊接技术研究所（广东省中乌研究院） | Iron-silicon-aluminum metal powder and preparation method thereof |
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