JP2000091113A - Steel plate for magnetic shield - Google Patents
Steel plate for magnetic shieldInfo
- Publication number
- JP2000091113A JP2000091113A JP10262901A JP26290198A JP2000091113A JP 2000091113 A JP2000091113 A JP 2000091113A JP 10262901 A JP10262901 A JP 10262901A JP 26290198 A JP26290198 A JP 26290198A JP 2000091113 A JP2000091113 A JP 2000091113A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic field
- shield
- rolling direction
- magnetic shield
- 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
Landscapes
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Soft Magnetic Materials (AREA)
- Regulation Of General Use Transformers (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は磁気シールド性能に
優れ、かつ、建築材料が一般的にさらされる腐食環境下
で優れた耐食性を有する磁気シールド材を提供すること
にある。[0001] The present invention is to provide a magnetic shielding material having excellent magnetic shielding performance and excellent corrosion resistance in a corrosive environment to which building materials are generally exposed.
【０００２】[0002]
【従来の技術】ＭＲＩやリニアモーターカーにおける直
流強磁場や、各種交通機関、建築鉄骨や鋼板、高圧線、
送配電設備などからの都市磁気雑音（直流、変動、交流
磁場）が精密機器や人体に与える影響が問題となってい
る。このような磁場の影響を防止するために、強磁性体
を用いた磁気シールド技術が用いられる。これは、透磁
率の高い材料を用いて、磁場の発生源や弱磁場要求のあ
る空間を囲い、磁束を磁性体内に集中させ、弱磁場が要
求される空間への磁束の侵入を防ぐものである。2. Description of the Related Art DC magnetic fields in MRI and linear motor cars, various types of transportation, building steel frames and steel plates, high-voltage lines,
The influence of urban magnetic noise (DC, fluctuation, AC magnetic field) from power transmission and distribution equipment on precision equipment and the human body has become a problem. In order to prevent the influence of such a magnetic field, a magnetic shield technique using a ferromagnetic material is used. This is to use a material with high magnetic permeability to surround the source of the magnetic field and the space where a weak magnetic field is required, concentrate the magnetic flux in the magnetic body, and prevent the entry of the magnetic flux into the space where a weak magnetic field is required. is there.
【０００３】磁気シールドに用いられる材料は、電磁鋼
板や電磁厚板、アモルファス、パーマロイなど透磁率の
高い材料である。それぞれに特徴があり、用途によって
使い分けられている。例えば電磁鋼板は、透磁率は高
く、価格も安いバランスのとれた材料であり磁気シール
ドに広く使用されている。しかし、電磁鋼板のなかで最
も透磁率の高い材料である方向性電磁鋼板は板厚が０．
３５mm以下であり、磁束を集中させ、効率よく磁気シー
ルドを行うにはもう少し板厚が厚い方が使いやすい。電
磁厚板は板厚が厚いためＭＲＩなどの強磁場を使う装
置、部屋に使われる。しかしながら、透磁率は電磁鋼板
に比べ低いためシールド体の重量は増加し易く、また板
厚が１．５mm〜２００mmと厚いため、取り扱いが困難で
ある。軽量化が望まれる機器や部屋には使いにくい。The material used for the magnetic shield is a material having a high magnetic permeability, such as an electromagnetic steel plate, an electromagnetic thick plate, amorphous and permalloy. Each has its own characteristics and is used differently depending on the application. For example, an electromagnetic steel sheet is a well-balanced material having a high magnetic permeability and a low price, and is widely used for a magnetic shield. However, the grain-oriented electrical steel sheet, which is the material having the highest magnetic permeability among the electrical steel sheets, has a thickness of 0.1 mm.
It is 35 mm or less, and it is easier to use a slightly thicker plate for concentrating magnetic flux and efficiently performing magnetic shielding. Since the electromagnetic thick plate is thick, it is used for a device or a room that uses a strong magnetic field such as MRI. However, since the magnetic permeability is lower than that of an electromagnetic steel sheet, the weight of the shield body tends to increase, and the thickness is as large as 1.5 mm to 200 mm, so that handling is difficult. It is difficult to use for equipment and rooms where weight reduction is desired.
【０００４】アモルファスは透磁率が高いものの、板厚
が２０〜３０μm と非常に薄く、シールド用途に使う場
合には、重ね積みをするなど何らかの方法で実効的な厚
さを厚くしなければならない。しかも透磁率を高くする
ために焼鈍を施すと脆くなり取り扱いが甚だ困難な材料
であり、総合的にみてシールド用途には向いていない。[0004] Although amorphous has high magnetic permeability, its thickness is very thin, 20 to 30 µm, and when used for shielding, the effective thickness must be increased by some method such as stacking. Moreover, when the material is annealed to increase the magnetic permeability, the material becomes brittle and extremely difficult to handle, and is not suitable for use in shielding as a whole.
【０００５】パーマロイは透磁率が非常に高いので、シ
ールド性能を重視した場合には使われる。しかし、価格
が非常に高い事と、歪みや残留磁化による性能劣化が激
しいので扱いにくい事が欠点である。Since permalloy has a very high magnetic permeability, it is used when emphasis is placed on shielding performance. However, the disadvantages are that the price is very high and that the performance is severely deteriorated due to distortion and residual magnetization, making it difficult to handle.
【０００６】以上のように、性能、扱い安さ、コストか
らみたときに、現状市販されている材料は、一長一短あ
る。性能が良く、扱いやすく、かつ価格が安いシールド
用の材料が望まれている。As described above, commercially available materials have advantages and disadvantages in view of performance, ease of handling, and cost. There is a need for a shielding material that has good performance, is easy to handle, and is inexpensive.
【０００７】また、従来、磁場が問題視されてきたのは
NMR など屋内の装置であり、磁場の影響を受ける空間も
制限されていたため、シールド技術は屋内に用いられる
事が多かった。しかしながら近年、前述したような都市
磁気雑音の問題が大きく取りざたされる様になってきて
いる。都市磁気雑音の特徴は磁場の発生源が大規模で特
定し難く、弱磁場が要求される空間も広大であることで
ある。このため、磁気シールドは屋内だけでなく、屋外
に配置するケースが増加してきている。シールド材料に
対しては、耐食性に優れるという事も重要な要件となっ
てきている。Conventionally, magnetic fields have been regarded as a problem.
Because it is an indoor device such as NMR, and the space affected by the magnetic field was limited, the shielding technology was often used indoors. However, in recent years, the above-mentioned problem of urban magnetic noise has been largely taken up. The characteristics of urban magnetic noise are that the source of the magnetic field is large and difficult to identify, and the space where a weak magnetic field is required is large. For this reason, the case where the magnetic shield is arranged not only indoors but also outdoors is increasing. It is also an important requirement for shield materials that they have excellent corrosion resistance.
【０００８】[0008]
【発明が解決しようとする課題】かような状況から、本
発明の目的とするところは、磁気シールド性に優れ、扱
いやすく、価格が安い磁気シールド用材料を提供するこ
とであり、また、優れた耐食性を有する磁気シールド用
材料を提供することにある。SUMMARY OF THE INVENTION Under such circumstances, an object of the present invention is to provide a magnetic shielding material which is excellent in magnetic shielding properties, easy to handle, and inexpensive. It is an object of the present invention to provide a magnetic shielding material having improved corrosion resistance.
【０００９】[0009]
【課題を解決するための手段】本発明者らは先に述べた
従来の問題点を解決すべく鋭意検討した結果、磁気シー
ルド性に優れ、扱いやすく、価格が安い磁気シールド用
材料、またそれに加えて、優れた耐食性を有する磁気シ
ールド用材料を発明した。本発明の要点は以下の通りで
ある。 （１） 圧延方向に直流磁場８０Ａ／ｍを印加した場合
の圧延方向の透磁率が０．０１９Ｈ／ｍ以上であり、板
厚が０．４mm以上かつ１．０mm以下の磁気シールド用鋼
板。 （２） 亜鉛を主成分としてクロム、ニッケル、コバル
ト、鉄、モリブデン、アルミニウム、マグネシウムのい
ずれかを合計で０〜６０％含む皮膜を、５〜１００ｇ／
ｍ2 有することを特徴とする前記（１）に記載の磁気シ
ールド用鋼板。Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned conventional problems, and as a result, they have excellent magnetic shielding properties, are easy to handle, and are inexpensive. In addition, a material for a magnetic shield having excellent corrosion resistance has been invented. The gist of the present invention is as follows. (1) A magnetic shielding steel sheet having a permeability in the rolling direction of 0.019 H / m or more and a thickness of 0.4 mm or more and 1.0 mm or less when a DC magnetic field of 80 A / m is applied in the rolling direction. (2) A film containing zinc as a main component and containing 0 to 60% of any of chromium, nickel, cobalt, iron, molybdenum, aluminum and magnesium in a total amount of 5 to 100 g /
m 2, wherein the steel sheet for a magnetic shield according to the above (1) is characterized by having m 2 .
【００１０】[0010]
【発明の実施の形態】以下に本発明を詳細に説明する。
まず、シールド性能と材料の磁気特性について述べる。
簡単のため二次元で、透磁率がμ、板厚がｔの無限の長
さを持つ板状のシールド材料で隔てられた領域ＡとＢを
考える。領域Ａには磁場発生源があり、シールド材によ
って領域B を磁場遮蔽しているとする。領域Ａの磁場に
よってシールド材料内を流れる磁束がφ、磁束密度がＢ
１であったとすると、 φ＝ｔ×Ｂ１＝ｔ×μ× Ｈ１ （１） となる。Ｈ１はシールド材内の起磁力であるが、境界条
件を考慮すると、Ｈ１は領域Ｂに漏洩する磁場に等しく
なる。よって、式（１）から板厚ｔが厚いほど、また、
透磁率μが大きいほど、Ｈ１は小さくなり、漏洩磁場は
小さくなることが分かる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
First, the shielding performance and the magnetic properties of the material will be described.
For the sake of simplicity, consider regions A and B separated by a plate-shaped shield material having a two-dimensional, infinite length having a permeability of μ and a plate thickness of t. It is assumed that there is a magnetic field generation source in the area A, and the area B is shielded by a shield material. The magnetic flux flowing through the shield material due to the magnetic field in the area A is φ, and the magnetic flux density is B
If it is 1, then φ = t × B1 = t × μ × H1 (1) H1 is the magnetomotive force in the shield material. H1 is equal to the magnetic field leaking to the region B in consideration of the boundary condition. Therefore, from the expression (1), as the plate thickness t is larger,
It can be seen that as the permeability μ increases, H1 decreases and the leakage magnetic field decreases.
【００１１】本発明の磁気シールド用鋼板は、優れた磁
気シールド性を有し、扱いやすく、しかもシールド体の
重量増加やコスト増加を抑えるため、圧延方向に直流磁
場８０Ａ／ｍを印加した場合の圧延方向の透磁率が０．
０１９Ｈ／ｍ以上であり、板厚が０．４mm以上かつ１．
０mm以下でなければない。板厚が０．４mm以上でかつ、
直流磁場８０Ａ／ｍを印加した場合の圧延方向の透磁率
が０．０１９Ｈ／ｍ以上であることにより、種々の磁気
シールドを対象にする事ができる。板厚が０．４mm以下
であっても、透磁率が０．０１９Ｈ／ｍ以下であって
も、磁気シールド性能は充分ではない。そのため、シー
ルド体を形成したときの重量がかえって増加してしまう
事が生じる。また、板厚は１．０mm以下とする事によっ
て、扱いやすくなる。板厚は１．０mm以上では、用途は
特殊なものに限られてくる。この様に透磁率と板厚の双
方を最適な範囲にすることにより、従来にない、性能と
扱い易さを兼ね備えたシールド用鋼板を得ることができ
る。The steel sheet for magnetic shielding of the present invention has an excellent magnetic shielding property, is easy to handle, and suppresses an increase in weight and cost of the shield body when applied with a DC magnetic field of 80 A / m in the rolling direction. The permeability in the rolling direction is 0.
019 H / m or more, the plate thickness is 0.4 mm or more and 1.
It must not be less than 0mm. The board thickness is 0.4mm or more and
When the magnetic permeability in the rolling direction when a DC magnetic field of 80 A / m is applied is 0.019 H / m or more, various magnetic shields can be targeted. Even if the plate thickness is 0.4 mm or less or the magnetic permeability is 0.019 H / m or less, the magnetic shielding performance is not sufficient. For this reason, the weight when the shield body is formed may rather increase. When the plate thickness is 1.0 mm or less, it becomes easy to handle. When the plate thickness is 1.0 mm or more, applications are limited to special ones. By setting both the magnetic permeability and the plate thickness in the optimum ranges as described above, a shielding steel plate having both performance and easiness to handle, which has not existed conventionally, can be obtained.
【００１２】更に本発明の鋼板に、防錆皮膜を鋼板上に
形成することにより、室外にも設置することのできる、
用途の広い磁気シールド鋼板とする事ができる。防錆皮
膜は鉄を犠牲防食する一般的な皮膜であり、塩水噴霧促
進試験で１２０時間赤錆びが出ない防錆能を有する皮膜
を付与する必要がある。１２０時間以内に赤錆びを生じ
る皮膜であると、屋外使用環境で数ヵ月で錆びを生じ、
外観の劣化を引き起こすのみならず極端な場合には透磁
率が低下し、本来の目的である磁気シールド性能を発揮
しなくなる。亜鉛を主成分として、クロム、ニッケル、
コバルト、鉄、モリブデンを０〜４０％含む皮膜を５〜
１００ｇ／ｍ2 形成するとこの条件を十分満足する。皮
膜を付与する方法は関しては特に限定するものではな
く、電気めっき・溶融めっきはもとより塗料中に亜鉛粉
末を添加し、その犠牲防食性を利用する技術を用いても
良い。Further, by forming a rust preventive film on the steel sheet of the present invention on the steel sheet, it can be installed outdoors.
It can be used as a magnetic shield steel plate with a wide use. The rust-preventive film is a general film that sacrifices and protects iron, and it is necessary to provide a film having a rust-preventive ability that does not cause red rust for 120 hours in a salt spray accelerated test. If the film generates red rust within 120 hours, it will rust in a few months in outdoor use environment,
In extreme cases, not only the appearance is deteriorated, but also in an extreme case, the magnetic permeability is reduced, and the original purpose of the magnetic shielding performance is not exhibited. With zinc as the main component, chromium, nickel,
5 to 5% coating containing 0 to 40% of cobalt, iron and molybdenum
When 100 g / m 2 is formed, this condition is sufficiently satisfied. There is no particular limitation on the method of providing the film, and a technique may be used in which zinc powder is added to the paint and the sacrificial corrosion resistance is used, in addition to electroplating and hot-dip plating.
【００１３】[0013]
【実施例】［実施例１］圧延方向に直流磁場８０Ａ／ｍ
を印加した場合の圧延方向の透磁率が０．０２１Ｈ／ｍ
であり、板厚が０．５mmの本発明の鋼板を４５５mm×４
５５mmの大きさに切断し、板の圧延方向を交叉させて重
ねることによりシールドパネルとした。板を偶数枚で枚
数を変化させ厚さの異なるパネルを用意した。同じ厚み
のパネル６面で立方体のシールドボックスに組み上げ、
シールドボックス外部からヘルムホルツコイルで磁場を
印加し、ボックス内部中心に磁場センサを置き内部の磁
場を測定した。各辺は無方向性電磁鋼板で目地を覆っ
た。磁場はシールドボックスのない状態のボックス中心
位置で６７Ａ／ｍとなるようにした印加した。[Example 1] DC magnetic field of 80 A / m in the rolling direction
Is 0.021H / m in the rolling direction when
The steel sheet of the present invention having a sheet thickness of 0.5 mm is 455 mm × 4
The sheet was cut to a size of 55 mm, and the sheets were overlapped with each other in the rolling direction of the sheet to obtain a shield panel. Panels having different thicknesses were prepared by changing the number of plates by an even number. Assemble into a cube shield box with 6 panels of the same thickness,
A magnetic field was applied by a Helmholtz coil from the outside of the shield box, a magnetic field sensor was placed at the center of the box, and the internal magnetic field was measured. Each side was covered with joints by non-oriented electrical steel sheet. The magnetic field was applied at 67 A / m at the center of the box without the shield box.
【００１４】パネルの厚みを変化させた場合の、シール
ド体全体の重量と内部の漏洩磁場の変化を表１に示す。
同表には、比較例として、板厚が０．５mmで直流磁場８
０Ａ／ｍを印加した場合の圧延方向の透磁率が０．００
９Ｈ／ｍの鋼板（無方向性電磁鋼板）を用いたときの結
果も示す。Table 1 shows changes in the weight of the entire shield body and changes in the leakage magnetic field inside when the thickness of the panel is changed.
In the same table, as a comparative example, a plate having a thickness of 0.5 mm and a DC magnetic field of 8 was used.
When the magnetic permeability in the rolling direction when 0 A / m is applied is 0.00
The results when using a 9H / m steel sheet (non-oriented electrical steel sheet) are also shown.
【００１５】実施例では、同じ条件の比較例に対して１
／２以下の強さまで内部漏洩磁場を低減することができ
る。比較例の鋼板４枚でパネルを構成したときよりも、
実施例の鋼板１枚でパネルを構成したときの方が、到達
する内部磁場は低い。このことは、漏洩磁場を同じ値に
するのに、本発明の鋼板を使用すれば、比較例鋼板を使
用したときの１／４の重量で済むことを示している。In the embodiment, 1 is set for the comparative example under the same conditions.
/ 2 or less can be reduced. Compared to when the panel was composed of four steel sheets of the comparative example,
The internal magnetic field reached is lower when the panel is composed of one steel sheet in the example. This indicates that if the steel sheet of the present invention is used to make the leakage magnetic field the same value, the weight can be reduced to 1/4 that of the comparative steel sheet.
【００１６】[0016]
【表１】 [Table 1]
【００１７】[0017]
【発明の効果】以上説明した通り、本発明によれば、優
れた磁気シールド性を有し、かつ、安価で極めて取り扱
い易く、しかも耐食性に優れた磁気シールド材料を得る
ことができる。As described above, according to the present invention, it is possible to obtain a magnetic shield material having excellent magnetic shielding properties, being inexpensive, extremely easy to handle, and having excellent corrosion resistance.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 黒崎 將夫 千葉県富津市新富20−１ 新日本製鐵株式 会社技術開発本部内 (72)発明者 遠藤 政文 東京都千代田区大手町２−６−３ 新日本 製鐵株式会社内 Ｆターム(参考） 4K033 RA05 TA00 4K062 AA01 BA20 BC06 BC11 CA02 FA12 GA01 5E041 AA11 CA05 HB06 NN05 NN06 NN14 NN17 5E058 CC12 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masao Kurosaki 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Corporation Technology Development Division (72) Inventor Masafumi Endo 2-6, Otemachi, Chiyoda-ku, Tokyo 3 F-term in Nippon Steel Corporation (reference) 4K033 RA05 TA00 4K062 AA01 BA20 BC06 BC11 CA02 FA12 GA01 5E041 AA11 CA05 HB06 NN05 NN06 NN14 NN17 5E058 CC12
Claims (2)
た場合の圧延方向の透磁率が０．０１９Ｈ／ｍ以上であ
り、板厚が０．４mm以上かつ１．０mm以下の磁気シール
ド用鋼板。1. A magnetic shielding steel sheet having a permeability in the rolling direction of 0.019 H / m or more and a thickness of 0.4 mm or more and 1.0 mm or less when a DC magnetic field of 80 A / m is applied in the rolling direction. .
コバルト、鉄、モリブデン、アルミニウム、マグネシウ
ムのいずれかを合計で０〜６０％含む皮膜を、５〜１０
０ｇ／ｍ2 有することを特徴とする請求項１に記載の磁
気シールド用鋼板。2. A chromium, nickel, and zinc as a main component.
A film containing 0 to 60% of any of cobalt, iron, molybdenum, aluminum and magnesium in total is 5 to 10%.
Steel sheet for magnetic shielding according to claim 1, characterized in that it comprises 0 g / m 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10262901A JP2000091113A (en) | 1998-09-17 | 1998-09-17 | Steel plate for magnetic shield |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10262901A JP2000091113A (en) | 1998-09-17 | 1998-09-17 | Steel plate for magnetic shield |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000091113A true JP2000091113A (en) | 2000-03-31 |
Family
ID=17382192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10262901A Pending JP2000091113A (en) | 1998-09-17 | 1998-09-17 | Steel plate for magnetic shield |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000091113A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007111019A1 (en) * | 2006-03-24 | 2007-10-04 | Kabushiki Kaisha Toshiba | Power receiving device, electronic apparatus using same and non-contact charger |
| WO2007122788A1 (en) * | 2006-03-24 | 2007-11-01 | Kabushiki Kaisha Toshiba | Power receiving device, electronic apparatus using same and non-contact charger |
| WO2009025279A1 (en) * | 2007-08-21 | 2009-02-26 | Kabushiki Kaisha Toshiba | Noncontact power receiving apparatus, electronic device using noncontact power receiving apparatus and charging system |
-
1998
- 1998-09-17 JP JP10262901A patent/JP2000091113A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007111019A1 (en) * | 2006-03-24 | 2007-10-04 | Kabushiki Kaisha Toshiba | Power receiving device, electronic apparatus using same and non-contact charger |
| WO2007122788A1 (en) * | 2006-03-24 | 2007-11-01 | Kabushiki Kaisha Toshiba | Power receiving device, electronic apparatus using same and non-contact charger |
| US8193767B2 (en) | 2006-03-24 | 2012-06-05 | Kabushiki Kaisha Toshiba | Power receiving device, and electronic apparatus and non-contact charger using the same |
| US8232764B2 (en) | 2006-03-24 | 2012-07-31 | Kabushiki Kaisha Toshiba | Power receiving device, and electronic apparatus and non-contact charging system using the same |
| JP5231993B2 (en) * | 2006-03-24 | 2013-07-10 | 株式会社東芝 | Power receiving device for non-contact charger |
| JP5231998B2 (en) * | 2006-03-24 | 2013-07-10 | 株式会社東芝 | Power receiving device |
| WO2009025279A1 (en) * | 2007-08-21 | 2009-02-26 | Kabushiki Kaisha Toshiba | Noncontact power receiving apparatus, electronic device using noncontact power receiving apparatus and charging system |
| KR101075329B1 (en) | 2007-08-21 | 2011-10-19 | 도시바 마테리알 가부시키가이샤 | Noncontact power receiving apparatus, electronic device using noncontact power receiving apparatus and charging system |
| US8922160B2 (en) | 2007-08-21 | 2014-12-30 | Kabushiki Kaisha Toshiba | Non-contact type power receiving apparatus, electronic equipment and charging system using the power receiving apparatus |
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