JP3094727B2 - Powder for magnetic shielding - Google Patents
Powder for magnetic shieldingInfo
- Publication number
- JP3094727B2 JP3094727B2 JP05085514A JP8551493A JP3094727B2 JP 3094727 B2 JP3094727 B2 JP 3094727B2 JP 05085514 A JP05085514 A JP 05085514A JP 8551493 A JP8551493 A JP 8551493A JP 3094727 B2 JP3094727 B2 JP 3094727B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- powder
- magnetic shielding
- powders
- particle size
- 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.)
- Expired - Lifetime
Links
- 239000000843 powder Substances 0.000 title claims description 49
- 239000002245 particle Substances 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 229910017060 Fe Cr Inorganic materials 0.000 description 4
- 229910002544 Fe-Cr Inorganic materials 0.000 description 4
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000006247 magnetic powder Substances 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 229910000889 permalloy Inorganic materials 0.000 description 2
- 229910000702 sendust Inorganic materials 0.000 description 2
- -1 wires Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
- Soft Magnetic Materials (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】この発明は、塗料とともに塗布し
て磁気を遮蔽するために用いる軟磁性体からなる鱗片状
の磁気シールド用粉末に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scale-like magnetic shielding powder made of a soft magnetic material which is used together with a paint to shield magnetism.
【０００２】[0002]
【従来の技術】最近の磁気記録装置、電子機器などは、
高密度化、小型化が進につれて外部磁場の影響を受けや
すくなってきており、同時に磁場発生源として周辺機器
に悪影響を与える可能性も高い。これら装置の保護およ
び外部への磁場の漏洩を防止するために磁気シールドを
設ける場合が増えている。磁気シールド材としては、
板、箔、線、繊維など種々の形状のものが使用されてい
るが、鱗片状の軟磁性体粉末を塗布する方法が提案され
ている（特開昭５８−５９２６８号公報参照）。2. Description of the Related Art Recent magnetic recording devices, electronic devices, etc.
As the densification and miniaturization have progressed, it has become more susceptible to the influence of external magnetic fields, and at the same time, there is a high possibility of adversely affecting peripheral devices as a magnetic field source. In many cases, a magnetic shield is provided to protect these devices and prevent leakage of a magnetic field to the outside. As a magnetic shielding material,
Various shapes such as plates, foils, wires, and fibers have been used, and a method of applying a flaky soft magnetic powder has been proposed (see JP-A-58-59268).
【０００３】この方法は、鱗片状の軟磁性体粉末を含む
塗料を塗布するだけで粉末が配向し、薄いシールド層が
得られるので小型軽量化に適している。このための鱗片
状軟磁性体粉末の材料は、フェライトなどの酸化物、パ
ーマロイ、センダストなどが知られているが、近年、ア
モルファス合金も用いられるようになってきた。This method is suitable for reduction in size and weight because the powder is oriented and a thin shield layer is obtained only by applying a paint containing scale-like soft magnetic powder. As the material of the flaky soft magnetic powder for this purpose, oxides such as ferrite, permalloy, sendust and the like are known, but in recent years, amorphous alloys have also been used.
【０００４】例えば、特開昭５９−２０１４９３号公報
には、鉄族金属のうち一種以上、あるいはこれと他の遷
移金属の一種以上：６５〜９０原子％と、ガラス化元
素：１０〜３５原子％からなるアモルファス合金薄板を
切断またはスリットして所定の寸法とし、必要に応じて
熱処理することにより製造される鱗片状磁気シールド用
アモルファス合金粉末が記載されており、また、特開平
１−１８４２０２号公報には、厚さ：０．１〜１０μ
ｍ、長さ：１〜５０μｍでアスペクト比（長さ／厚さ）
が３〜１００の鱗片状磁気シールド用アモルファス合金
粉末が記載されており、さらに、これら鱗片状磁気シー
ルド用アモルファス合金粉末の平均厚さを０．０１〜１
μｍと一層薄く、アスペクト比（平均外径／平均厚さ）
を１０〜１００００と一層大きくして磁気シールド粉末
としての特性を向上せしめた鱗片状磁気シールド用アモ
ルファス合金粉末が特開平１−１３９７０２号公報およ
び特開平１−２０５４０４号公報に記載されている。For example, JP-A-59-201493 discloses that one or more of iron group metals or one or more of these and other transition metals: 65 to 90 atomic%, and a vitrifying element: 10 to 35 atoms. % Is described by cutting or slitting a thin amorphous alloy sheet having a predetermined size into a predetermined size and subjecting it to a heat treatment if necessary. In the gazette, thickness: 0.1-10μ
m, length: aspect ratio (length / thickness) at 1 to 50 μm
Are described, and the average thickness of the amorphous alloy powder for flake-shaped magnetic shield is 0.01 to 1
As thin as μm, aspect ratio (average outer diameter / average thickness)
Are described in JP-A-1-139702 and JP-A-205404.
【０００５】しかし、フェライトなどの酸化物粉末は脆
いために鱗片状になりにくく、パーマロイは高価である
とともに鱗片状化に要する時間が長くてコストがかか
り、センダストは耐蝕性が低く、鱗片状化すると比表面
積が大きくなって発火しやすくなり取扱い上問題があ
る。さらにアモルファス合金鱗片状粉末は超急冷工程お
よび粉砕工程の少なくとも２工程を必要とし、しかも量
産化に限界があるなどの問題点があった。[0005] However, oxide powders such as ferrite are not brittle because they are brittle. Permalloy is expensive, and the time required for flake formation is long and costly. Sendust has low corrosion resistance and flake formation. Then, the specific surface area becomes large and it is easy to ignite, and there is a problem in handling. Further, the amorphous alloy flaky powder requires at least two steps of a super-quenching step and a pulverizing step, and there is a problem that mass production is limited.
【０００６】そのため、最近は、大量に使用される鱗片
状磁気シールド粉末として比較的安価なＦｅ−Ｃｒ系合
金粉末が用いられるようになり、例えば、特開平１−２
２３６２７号公報には、Ｃｒ：０．５〜２０重量％、Ｓ
ｉ：０．５〜９重量％、Ａｌ：０．５〜１５重量％を含
有し、残部：Ｆｅおよび不可避不純物からなる成分組成
を有することを特徴とする磁気シールド用粉末が記載さ
れており、また特開平３−２９５２０６号公報には、Ｓ
ｉ：１８〜３０原子％、Ｃｒ：１９原子％以下を含有
し、残部：Ｆｅおよび不可避不純物からなる成分組成を
有し、平均厚さｄ：１μｍ以下、粒度分布計によって求
められた粒径の小さい方から重量を累計して５０％にな
ったときの粒径Ｄ50が５〜３０μｍであり、アスペクト
比（Ｄ50／ｄ）：１０〜３０００であるＦｅ−Ｃｒ系合
金鱗片状磁気シールド粉末が記載されており、特に前記
特開平３−２９５２０６号公報記載のＦｅ−Ｃｒ系合金
からなる鱗片状磁気シールド粉末は、価格が安く、耐蝕
性および磁気シールド性にも優れているので注目されて
いる。[0006] Therefore, recently, relatively inexpensive Fe-Cr alloy powders have been used as flaky magnetic shield powders used in large quantities.
No. 23627, Cr: 0.5 to 20% by weight, S
i: 0.5 to 9% by weight, Al: 0.5 to 15% by weight, and the balance: Fe and a component composition consisting of unavoidable impurities; Japanese Patent Application Laid-Open No. 3-295206 discloses that S
i: 18 to 30 atomic%, Cr: 19 atomic% or less, the balance: having a component composition composed of Fe and unavoidable impurities, average thickness d: 1 μm or less, and a particle diameter determined by a particle size distribution analyzer. a particle size D 50 of 5~30μm when people became 50% by total weight of small aspect ratio (D 50 / d): Fe -Cr -based alloy flake magnetic shield powder is 10 to 3000 In particular, the flaky magnetic shield powder composed of an Fe-Cr-based alloy described in JP-A-3-295206 has attracted attention because it is inexpensive and has excellent corrosion resistance and magnetic shield properties. I have.
【０００７】[0007]
【発明が解決しようとする課題】しかし、従来よりも安
価でしかも磁気シールド性能の優れた磁気シールド粉末
は常に求められており、従来のＦｅ−Ｃｒ系合金鱗片状
磁気シールド粉末の磁気シールド性能の一層の改善が求
められていた。However, there is always a need for a magnetic shield powder that is less expensive than the conventional one and has excellent magnetic shield performance, and the magnetic shield performance of the conventional Fe-Cr-based alloy flaky magnetic shield powder is low. Further improvement was required.
【０００８】[0008]
【課題を解決するための手段】そこで、本発明者らは、
従来よりも磁気シールド性能が高くかつ保磁力が低い磁
気シールド特性に優れたＦｅ−Ｃｒ系合金鱗片状磁気シ
ールド粉末を開発すべく研究を行った結果、平均厚さ
ｄ：０．０２〜０．６μｍ、粒度分布計によって求めら
れた粒径の小さい方から重量を累計して５０％になった
ときの粒径をＤ50とすると、Ｄ50：１０〜４０μｍであ
り、アスペクト比（Ｄ50／ｄ）：２０〜５００である磁
気シールド用粉末において、ＭをＡｌまたはＳｉのうち
の１種または２種とすると、原子％で、Ｍ：１５〜３０
％、Ｃｒ：３〜１５％、Ｃ：０．５〜３％、残部：Ｆｅ
および不可避不純物からなる成分組成を有する磁気シー
ルド用粉末は、従来よりも磁気シールド性能が向上する
という研究結果が得られたのである。Means for Solving the Problems Accordingly, the present inventors have:
As a result of researching to develop Fe-Cr-based alloy flaky magnetic shield powder having higher magnetic shield performance and lower magnetic coercive force than the conventional magnetic shield characteristics, the average thickness d: 0.02-0. 6 [mu] m, when the D 50 particle size when it becomes 50% by total weight from the smaller particle size obtained by the particle size distribution meter, D 50: a 10 to 40 [mu] m, an aspect ratio (D 50 / d): In the magnetic shielding powder of 20 to 500, if M is one or two of Al or Si, M: 15 to 30 in atomic%.
%, Cr: 3 to 15%, C: 0.5 to 3%, balance: Fe
Research results have shown that the magnetic shielding powder having a component composition composed of unavoidable impurities has improved magnetic shielding performance as compared with the related art.
【０００９】この発明は、かかる研究結果にもとずいて
なされたものであって、平均厚さｄ：０．０２〜０．６
μｍ、Ｄ50：１０〜４０μｍであり、アスペクト比（Ｄ
50／ｄ）：２０〜５００である磁気シールド用粉末にお
いて、原子％で、Ｍ：１５〜３０％、Ｃｒ：３〜１５
％、Ｃ：０．５〜３％、残部：Ｆｅおよび不可避不純物
からなる成分組成を有する磁気シールド用粉末に特徴を
有するものである。[0009] The present invention has been made based on the results of such research, and has an average thickness d: 0.02 to 0.6.
μm, D 50 : 10 to 40 μm, and the aspect ratio (D
50 / d): In a magnetic shielding powder of 20 to 500 , in atomic%, M: 15 to 30%, Cr: 3 to 15
%, C: 0.5 to 3%, balance: Fe and a magnetic shielding powder having a component composition consisting of unavoidable impurities.
【００１０】以下にこの磁気シールド用粉末の成分組
成、平均厚さｄ、Ｄ50、アスペクト比（Ｄ50／ｄ）を上
記の如く限定した理由について説明する （ａ） Ｍ（ＡｌまたはＳｉのうちの１種または２種） Ｍの含有量が１５原子％未満では保磁力（Ｈc ）が高く
なり過ぎるとともに磁気シールド性能も低下するので好
ましくなく、一方、３０原子％を越えて含有すると、粉
末の飽和磁化が下がるので十分な磁気シールド性能が得
られない。したがって、Ｍの含有量は１５〜３０原子％
に定めた。The reasons why the component composition, average thickness d, D 50 and aspect ratio (D 50 / d) of the magnetic shielding powder are limited as described above will be described below. (A) Of M (Al or Si) If the content of M is less than 15 atomic%, the coercive force (H c ) becomes too high and the magnetic shielding performance also deteriorates, which is not preferable. Therefore, sufficient magnetic shielding performance cannot be obtained because the saturation magnetization is lowered. Therefore, the content of M is 15 to 30 atomic%.
Determined.
【００１１】（ｂ） Ｃｒ Ｃｒの含有量は３原子％未満であると耐蝕性が低下し、
錆の発生や変色が起きやすくなるので好ましくなく、一
方、１５原子％を越えて含有すると、粉末の飽和磁化が
下がるので十分な磁気シールド性能が得られない。した
がって、Ｃｒの含有量は３〜１５原子％に定めた。(B) Cr If the Cr content is less than 3 atomic%, the corrosion resistance is reduced,
Rust and discoloration are apt to occur, which is not preferable. On the other hand, if the content exceeds 15 atomic%, the saturation magnetization of the powder is reduced, so that sufficient magnetic shielding performance cannot be obtained. Therefore, the content of Cr is set to 3 to 15 atomic%.
【００１２】（ｃ） Ｃ Ｃは、熱処理効果を高め、磁気シールド性能を向上させ
る作用を有するが、その含有量が、０．５原子％未満で
は十分な磁気シールド性能向上効果が得られず、一方、
３原子％を越えて含有すると、保磁力（Ｈc ）が高くな
り過ぎるとともに粉砕に際して粉末の燐片状化が困難に
なるので好ましくない。したがって、Ｃの含有量は０．
５〜３原子％に定めた。(C) C C has the effect of enhancing the heat treatment effect and improving the magnetic shielding performance. However, if the content is less than 0.5 atomic%, a sufficient effect of improving the magnetic shielding performance cannot be obtained. on the other hand,
If the content exceeds 3 atomic%, the coercive force (H c ) becomes too high, and it becomes difficult to make the powder scaly at the time of grinding. Therefore, the content of C is 0.1.
It was determined to be 5 to 3 atomic%.
【００１３】（ｄ） 平均厚さｄ 磁気シールド用粉末の平均厚さｄを小さくするほど磁気
シールド特性を向上させることができるが、０．０２μ
ｍ未満にすると圧延粉砕による応力歪みのために保磁力
が大きくなり、一方、平均厚さｄが０．６μｍを越える
と、塗膜中に含まれる粉末の枚数が少なくなり、いずれ
の場合も磁気シールド効果が低下するので好ましくな
い。したがって、磁気シールド用粉末の平均厚さｄは、
０．０２〜０．６μｍに定めた。(D) Average Thickness d As the average thickness d of the magnetic shielding powder decreases, the magnetic shielding characteristics can be improved.
When the average thickness d exceeds 0.6 μm, the number of powders contained in the coating film decreases, and in any case, the magnetic force increases. It is not preferable because the shielding effect is reduced. Therefore, the average thickness d of the magnetic shielding powder is
It was set to 0.02 to 0.6 μm.
【００１４】（ｅ） Ｄ50 粒度分布計によって求められた粒径を、粒径の小さい方
から重量を累計して５０％になったときの粒径Ｄ50を、
１０μｍ未満まで小さくすると、表面積が増えるため粉
末間の空隙に存在する有機バインダーの量が多くなり、
アスペクト比の大きい粉末の割合いが減るために磁気シ
ールド効果が低下するので好ましくない。一方、Ｄ50が
４０μｍを越えると、有機バインダー中での分散性が悪
くなり、塗布時にむらを生じ均一な塗膜が得られないの
で好ましくない。したがって、Ｄ50：１０〜４０μｍと
定めた。[0014] The particle size D 50 when the particle size obtained by the 50 particle size analyzer (e) D, was 50% by total weight from the smaller particle size,
When the particle size is reduced to less than 10 μm, the surface area increases, so that the amount of the organic binder existing in the gap between the powders increases,
Since the proportion of the powder having a large aspect ratio is reduced, the magnetic shielding effect is reduced, which is not preferable. On the other hand, if D 50 exceeds 40 [mu] m, deteriorated dispersibility in an organic binder, it does not obtain a uniform coating film occurs unevenness at the time of coating is not preferred. Thus, D 50: was defined as 10 to 40 [mu] m.
【００１５】（ｆ） アスペクト比（Ｄ50／ｄ） アスペクト比が２０未満であると、粉末の接触面積は減
り、磁気抵抗は増加するので好ましくなく、一方、アス
ペクト比が、５００を越えると歪みによる保磁力が増加
し、かつ粒径の大きな粉末が混入するため均一な塗膜を
得ることが難しくなる。したがって、アスペクト比は、
２０〜５００に定めた。(F) Aspect ratio (D 50 / d) When the aspect ratio is less than 20, the contact area of the powder decreases and the magnetic resistance increases, which is not preferable. This increases the coercive force and mixes powder with a large particle size, making it difficult to obtain a uniform coating film. Therefore, the aspect ratio is
20 to 500.
【００１６】[0016]
【実施例】合金原料を高周波溶解して表１〜表３に示さ
れる成分組成のインゴットを作製し、これらインゴット
を粗粉砕した後、分級処理を行って最大粒径：５０μｍ
に揃えた。この粗粉末をさらに湿式アトライターボール
ミルにて鱗片状化し、表１〜表３に示される、Ｄ50、ｄ
およびアスペクト比（Ｄ50／ｄ）を有する本発明磁気シ
ールド用粉末１〜２０、比較磁気シールド用粉末１〜８
および従来磁気シールド用粉末１〜２を作製した。EXAMPLES Ingots having the component compositions shown in Tables 1 to 3 were prepared by high frequency melting of alloy raw materials, and these ingots were roughly pulverized and then subjected to a classification treatment to obtain a maximum particle size of 50 μm.
Aligned. The coarse powder was further flaked by a wet attritor ball mill, and D 50 , d shown in Tables 1 to 3 were obtained.
Of the present invention having an aspect ratio (D 50 / d) and powders 1 to 20 of the present invention, and powders 1 to 8 of comparative magnetic shields
In addition, powders 1 and 2 for a conventional magnetic shield were prepared.
【００１７】[0017]
【表１】 [Table 1]
【００１８】[0018]
【表２】 [Table 2]
【００１９】[0019]
【表３】 [Table 3]
【００２０】これら本発明磁気シールド用粉末１〜２
０、比較磁気シールド用粉末１〜８および従来磁気シー
ルド用粉末１〜２を、熱処理炉に入れ、１．０×１０-2
Ｔｏｒｒの真空に排気した後、Ａｒガスを導入してＡｒ
ガス雰囲気に保持し、このＡｒガス雰囲気中にて表４〜
表６に示される温度で熱処理し、熱処理された本発明磁
気シールド用粉末１〜２０、比較磁気シールド用粉末１
〜８および従来磁気シールド用粉末１〜２の保磁力（Ｈ
c ）を測定し、それらの測定値を表４〜表６に示した。The magnetic shield powders 1-2 of the present invention
0, Comparative Magnetic Shielding Powders 1 to 8 and Conventional Magnetic Shielding Powders 1 to 2 were placed in a heat treatment furnace and placed in a heat treatment furnace at 1.0 × 10 −2.
After evacuating to Torr vacuum, Ar gas was introduced to
Gas atmosphere, and in this Ar gas atmosphere,
Heat-treated powders 1 to 20 of the present invention, heat-treated at the temperatures shown in Table 6, and powders 1 for comparative magnetic shield
8 and conventional magnetic shield powders 1-2 (H
c ) was measured, and the measured values are shown in Tables 4 to 6.
【００２１】さらに、前記熱処理された本発明磁気シー
ルド用粉末１〜２０、比較磁気シールド用粉末１〜８お
よび従来磁気シールド用粉末１〜２をそれぞれ有機バイ
ンダー（エポキシ樹脂）と３：１の割合で混合し、厚
さ：２ｍｍの板に成形し、磁気シールド板を作製した。
この磁気シールド板をフェライト磁石上に設置し、磁気
シールド板から１ｃｍの位置での磁束密度Ｂを測定し、
これと磁気シールド板がない場合の磁束密度Ｂ0 を測定
し、シールド比（Ｂ／Ｂ0 ）を算出し、これらの結果を
表４〜表６に示した。Further, the heat-treated magnetic shielding powders 1 to 20, the comparative magnetic shielding powders 1 to 8 and the conventional magnetic shielding powders 1 to 2 were mixed with an organic binder (epoxy resin) at a ratio of 3: 1. , And molded into a plate having a thickness of 2 mm to produce a magnetic shield plate.
This magnetic shield plate was placed on a ferrite magnet, and the magnetic flux density B at a position 1 cm from the magnetic shield plate was measured.
This and the magnetic flux density B 0 without the magnetic shield plate were measured, and the shield ratio (B / B 0 ) was calculated. The results are shown in Tables 4 to 6.
【００２２】[0022]
【表４】 [Table 4]
【００２３】[0023]
【表５】 [Table 5]
【００２４】[0024]
【表６】 [Table 6]
【００２５】表１〜表６に示される結果から、Ｃを０．
５〜３原子％を含む本発明磁気シールド用粉末１〜２０
で作製した磁気シールド板を設置したときシールド比：
Ｂ／Ｂ0 は、Ｃを含まない従来磁気シールド用粉末１〜
２で作製した磁気シールド板を設置したときのシールド
比：Ｂ／Ｂ0 に比べて格段に小さな値を示すところか
ら、本発明磁気シールド用粉末１〜２０は従来磁気シー
ルド用粉末１〜２に比べて優れた磁気シールド性能を示
すことが分かる。しかし、この発明の範囲から外れてい
る値（表３において、この発明の範囲から外れている値
に＊印を付して示した。）を有する比較磁気シールド用
粉末１〜８で作製した磁気シールド板を設置した時のシ
ールド比：Ｂ／Ｂ0 はやや大きくなることから、比較磁
気シールド用粉末１〜８の磁気シールド性能はやや劣る
ことがわかる。From the results shown in Tables 1 to 6, C was set to 0.
The magnetic shielding powder of the present invention containing 5 to 3 atomic%.
When the magnetic shield plate manufactured in the above is installed, the shield ratio:
B / B 0 is the conventional magnetic shielding powder 1 containing no C.
The magnetic shield powders 1 to 20 of the present invention were replaced with the conventional magnetic shield powders 1 and 2 because the shield ratio when the magnetic shield plate manufactured in Step 2 was installed was significantly smaller than B / B 0. It can be seen that a superior magnetic shielding performance is exhibited. However, magnets made with comparative magnetic shielding powders 1 to 8 having values outside the range of the present invention (in Table 3, the values outside the range of the present invention are indicated with an asterisk). Since the shield ratio: B / B 0 when the shield plate was set slightly increased, it can be seen that the magnetic shield performance of the comparative magnetic shield powders 1 to 8 was slightly inferior.
【００２６】[0026]
【発明の効果】この発明によると、従来よりも優れた磁
気シールド用粉末を提供することができ、電気および電
子産業において優れた効果をもたらすものである。According to the present invention, it is possible to provide a powder for a magnetic shield which is superior to the conventional one, and to bring about an excellent effect in the electric and electronic industries.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｈ０５Ｋ 9/00 Ｈ０５Ｋ 9/00 Ｗ Ｈ０１Ｆ 1/14 Ａ (72)発明者 斉藤 八郎 東京都新宿区市谷加賀町一丁目１番１号 (72)発明者 吉岡 康明 東京都新宿区市谷加賀町一丁目１番１号 (72)発明者 梅沢 敦 東京都新宿区市谷加賀町一丁目１番１号 (72)発明者 石山 宏一 埼玉県大宮市北袋町１−297 三菱マテ リアル株式会社 中央研究所内 (72)発明者 武下 拓夫 埼玉県大宮市北袋町１−297 三菱マテ リアル株式会社 中央研究所内 (56)参考文献 特開 平４−48003（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01F 1/20 B22F 1/00 C22C 33/02 C22C 38/00 303 H01F 1/147 H05K 9/00 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI H05K 9/00 H05K 9/00 W H01F 1/14 A (72) Inventor Hachiro Saito 1-1-1 Kagamachi, Ichigaya-cho, Shinjuku-ku, Tokyo No. 1 (72) Inventor Yasuaki Yoshioka 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo (72) Inventor Atsushi Umezawa 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo (72) Inventor Koichi Ishiyama Saitama 1-297 Kitabukurocho, Omiya City, Prefecture Mitsubishi Materials Corporation Central Research Laboratory (72) Inventor Takuo Takeshita 1-2297 Kitabukurocho, Omiya City, Saitama Prefecture Mitsubishi Materials Corporation Central Research Laboratory (56) References −48003 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) H01F 1/20 B22F 1/00 C22C 33/02 C22C 38/00 303 H01F 1/147 H05K 9/00
Claims (1)
を累計して５０％になったときの粒径をＤ50とすると、
Ｄ50：１０〜４０μｍであり、アスペクト比（Ｄ50／
ｄ）：２０〜５００である磁気シールド用粉末におい
て、 ＭをＡｌまたはＳｉのうちの１種または２種とすると、
原子％で、 Ｍ：１５〜３０％、 Ｃｒ：３〜１５％、 Ｃ：０．５〜３％、 残部：Ｆｅおよび不可避不純物からなる成分組成を有す
ることを特徴とする磁気シールド用粉末。1. A mean thickness d: 0.02~0.6μm, when the D 50 particle size when it becomes 50% by total weight from the smaller particle size obtained by the particle size analyzer ,
D 50: a 10~40μm, the aspect ratio (D 50 /
d): In the magnetic shielding powder of 20 to 500, when M is one or two of Al or Si,
Atomic%, M: 15 to 30%, Cr: 3 to 15%, C: 0.5 to 3%, balance: Fe and a magnetic shielding powder characterized by having a component composition consisting of unavoidable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05085514A JP3094727B2 (en) | 1993-03-19 | 1993-03-19 | Powder for magnetic shielding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05085514A JP3094727B2 (en) | 1993-03-19 | 1993-03-19 | Powder for magnetic shielding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06275418A JPH06275418A (en) | 1994-09-30 |
| JP3094727B2 true JP3094727B2 (en) | 2000-10-03 |
Family
ID=13861028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05085514A Expired - Lifetime JP3094727B2 (en) | 1993-03-19 | 1993-03-19 | Powder for magnetic shielding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3094727B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0854669B1 (en) * | 1997-01-20 | 2003-03-26 | Daido Steel Company Limited | Soft magnetic alloy powder for electromagnetic and magnetic shield, and shielding members containing the same |
| JP4936233B2 (en) * | 1997-09-22 | 2012-05-23 | 三菱マテリアル株式会社 | Flat Fe-based alloy powder for magnetic shield |
| JP2007273732A (en) * | 2006-03-31 | 2007-10-18 | Tdk Corp | Noise suppressing soft magnetism metal powder and noise suppressing sheet |
| CN109834257A (en) * | 2017-11-27 | 2019-06-04 | 洛阳尖端技术研究院 | A kind of wave absorbing agent and preparation method thereof |
| CN111455409B (en) * | 2020-05-25 | 2021-07-30 | 有研资源环境技术研究院(北京)有限公司 | Coating material of magnetic shielding tank shell for vertical aluminum electrolytic tank and preparation method of magnetic shielding tank shell |
-
1993
- 1993-03-19 JP JP05085514A patent/JP3094727B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06275418A (en) | 1994-09-30 |
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