JP2008050644A - Flat powder for electromagnetic wave absorbent body, and electromagnetic wave absorbent body - Google Patents
Flat powder for electromagnetic wave absorbent body, and electromagnetic wave absorbent body Download PDFInfo
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- 239000000843 powder Substances 0.000 title claims abstract description 28
- 230000002745 absorbent Effects 0.000 title abstract 6
- 239000002250 absorbent Substances 0.000 title abstract 6
- 239000012535 impurity Substances 0.000 claims abstract description 15
- 239000011810 insulating material Substances 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 239000006096 absorbing agent Substances 0.000 claims description 28
- 229920001971 elastomer Polymers 0.000 claims description 5
- 239000005060 rubber Substances 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 239000000203 mixture Substances 0.000 abstract description 8
- 229910052804 chromium Inorganic materials 0.000 abstract description 4
- 229910052710 silicon Inorganic materials 0.000 abstract description 4
- 238000004898 kneading Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 14
- 239000000463 material Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000006247 magnetic powder Substances 0.000 description 3
- 238000009689 gas atomisation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 1
- 229910002555 FeNi Inorganic materials 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
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- 230000007257 malfunction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001195 polyisoprene Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910000702 sendust Inorganic materials 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 238000009692 water atomization Methods 0.000 description 1
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Abstract
Description
本発明は、電磁波吸収体用扁平粉末および電磁波吸収体に関するものである。 The present invention relates to a flat powder for an electromagnetic wave absorber and an electromagnetic wave absorber.
近年、パソコン、携帯電話などの電子機器、情報機器が急速に発達、普及して来ており、これに伴ってそれから発生する電磁波が誤動作の原因になったり、人体に悪影響を及ぼすなどの電磁波による障害が問題視されている。これらパソコンや携帯電話などのノイズ対策部品として軟磁性粉末による電磁波吸収体が使用されている。しかも、これらの製品は、近年の情報処理の増加に伴い、高周波化が進んでいる。 In recent years, electronic devices and information devices such as personal computers and mobile phones have been rapidly developed and popularized, and electromagnetic waves generated from such devices have become a cause of malfunctions and have adverse effects on human bodies. Disability is regarded as a problem. An electromagnetic wave absorber made of soft magnetic powder is used as a noise countermeasure component for such personal computers and mobile phones. Moreover, the frequency of these products is increasing with the increase in information processing in recent years.
このような状況化で粉末に求められ特性としては、（１）高い固有抵抗（製品の高周波化に対応するため）、（２）低い保磁力（ノズル対策性の向上）、（３）高耐候性（耐環境性）である。従来から使用されている軟磁性材料としては、ＦｅＳｉＡｌ系、ＦｅＮｉ系等が主流であり、特にセンダスト（登録商標名）は保磁力が０．２Ｏｅ程度と低く磁気特性に優れているが、固有抵抗が８０μΩ・ｃｍ程度で十分な高周波特性を有するとは言いがたい。そこで、さらに製品の高周波化・高吸収量化を達成するためには固有抵抗を増加させ、保磁力（Ｈｃ）を低減した材料が望まれている。 In this situation, the characteristics required of the powder are (1) high specific resistance (to cope with higher frequency of products), (2) low coercive force (improvement of nozzle countermeasures), and (3) high weather resistance. (Environmental resistance). Conventionally used soft magnetic materials are mainly FeSiAl and FeNi, and Sendust (registered trademark) has a low coercive force of about 0.2 Oe and excellent magnetic properties. Cannot be said to have sufficient high-frequency characteristics at about 80 μΩ · cm. Therefore, in order to achieve higher frequency and higher absorption of the product, a material with increased specific resistance and reduced coercive force (Hc) is desired.
上述した特性を改良するために、例えば特開平１１−８７１１７号公報（特許文献１）に開示されているように、絶縁性の基材中に粉末厚みが３μｍ以下の厚みの軟磁性扁平粉末を分散させてなる高周波電磁波吸収体が提案されている。
しかしながら、上述した絶縁性の基材であるゴムまたはプラスチックを基材として、その内部に軟磁性扁平粉末を分散含有させて電磁波吸収体を構成することができ、パソコン等の電子機器の電磁波発生源を電磁波吸収体にて容易に包み込みこむことが出来るものであるが、未だ十分は固有抵抗を増加させ、Ｈｃを低減した材料には至っていないのが実状である。 However, it is possible to configure an electromagnetic wave absorber by using the above-mentioned insulating base material, rubber or plastic, as a base material and dispersing soft magnetic flat powder therein, and generating an electromagnetic wave source for electronic devices such as personal computers. Can be easily encased in an electromagnetic wave absorber, but the actual situation is that the material has not yet been sufficiently increased in specific resistance and reduced in Hc.
上述のような問題を解消するために、発明者らは鋭意開発を進め、組成が固有抵抗・磁気特性に及ぼす影響を調査した結果、質量％で、Ｓｉ：９〜１２％、Ａｌ：１〜５％、Ｃｒ：１〜５％、残部Ｆｅからなる成分組成範囲内で、従来にない高固有抵抗、低保磁力を達成することを見出したものである。その発明の要旨とするところは、
（１）質量％で、Ｓｉ：９〜１２％、Ａｌ：１〜５％、Ｃｒ：１〜５％、残部Ｆｅおよび不純物からなり、かつ該不純物としてのＮｉ、Ｃｏ、Ｔｉ、Ｍｎ、Ｃｕの何れも２％以下とすることを特徴とする電磁波吸収体用扁平粉末。
（２）前記（１）に記載の粉末のアスペクト比が１０以上であることを特徴とする電磁波吸収体用扁平粉末。
（３）質量％で、Ｓｉ：９〜１２％、Ａｌ：１〜５％、Ｃｒ：１〜５％、残部Ｆｅおよび不純物からなり、かつ該不純物としてのＮｉ、Ｃｏ、Ｔｉ、Ｍｎ、Ｃｕの何れも２％以下とする電磁波吸収体用扁平粉末を柔軟な絶縁材中に分散させて混練してなることを特徴とする電磁波吸収体。
（４）前記（３）に記載の絶縁材が、ゴムまたはプラスチックであることを特徴とする電磁波吸収体にある。
In order to solve the above-mentioned problems, the inventors have intensively developed and investigated the influence of the composition on the specific resistance and magnetic properties. As a result, in mass%, Si: 9 to 12%, Al: 1 to 1 It has been found that a high specific resistance and a low coercive force are achieved in a component composition range consisting of 5%, Cr: 1 to 5% and the balance Fe. The gist of the invention is that
(1) By mass%, Si: 9 to 12%, Al: 1 to 5%, Cr: 1 to 5%, balance Fe and impurities, and as impurities, Ni, Co, Ti, Mn, Cu A flat powder for electromagnetic wave absorbers, characterized in that both are 2% or less.
(2) The flat powder for an electromagnetic wave absorber, wherein the powder according to (1) has an aspect ratio of 10 or more.
(3) By mass%, Si: 9 to 12%, Al: 1 to 5%, Cr: 1 to 5%, balance Fe and impurities, and as impurities, Ni, Co, Ti, Mn, Cu An electromagnetic wave absorber comprising: a flat powder for an electromagnetic wave absorber that is 2% or less dispersed in a flexible insulating material and kneaded.
(4) The electromagnetic wave absorber according to (3), wherein the insulating material is rubber or plastic.
以上述べたように、本発明により、極めて優れた電磁波吸収特性に優れた電磁波吸収体用扁平粉末およびこれを用いた電磁波吸収体を得ることができるものである。 As described above, according to the present invention, it is possible to obtain an electromagnetic wave absorber flat powder excellent in electromagnetic wave absorption characteristics and an electromagnetic wave absorber using the same.
以下、本発明についての成分組成の限定理由について説明する。
Ｓｉ：９〜１２％
Ｓｉは、固有抵抗を高くするために添加する元素で、そのためには９％以上必要である。しかし、９％未満では固有抵抗が不十分であり、１２％を超えると保磁力が増大することから、その範囲を９〜１２％とした。好ましくは１０〜１１％とする。
Hereinafter, the reasons for limiting the component composition according to the present invention will be described.
Si: 9-12%
Si is an element added to increase the specific resistance, and for that purpose, 9% or more is necessary. However, if it is less than 9%, the specific resistance is insufficient, and if it exceeds 12%, the coercive force increases, so the range was made 9 to 12%. Preferably it is 10 to 11%.
Ａｌ：１〜５％
Ａｌは、固有抵抗および耐食性を高めるとともに、保磁力低減に効果のある元素で、１％未満では、その効果がなく、保磁力Ｈｃが増大する。また、５％を超えると保磁力Ｈｃが増大することから、その範囲を１〜５％とした。好ましくは２〜４％とする。
Al: 1 to 5%
Al increases the specific resistance and corrosion resistance, and is an element effective for reducing the coercive force. If it is less than 1%, the effect is not obtained, and the coercive force Hc increases. Moreover, since coercive force Hc will increase when it exceeds 5%, the range was made into 1 to 5%. Preferably it is 2 to 4%.
Ｃｒ：１〜５％
Ｃｒは、耐食性および固有抵抗を改善するために添加する元素で、１％未満ではその効果が改善されず、また、５％を超えると保磁力Ｈｃが増大する。従って、その範囲を１〜５％とする。好ましくは２〜４％とする。
Cr: 1 to 5%
Cr is an element added to improve the corrosion resistance and specific resistance. If it is less than 1%, the effect is not improved, and if it exceeds 5%, the coercive force Hc increases. Therefore, the range is made 1 to 5%. Preferably it is 2 to 4%.
次に、本発明の電磁波吸収体用扁平粉末の不純物について説明する。
Ｍｎ、Ｎｉ、Ｃｕ、Ｃｏ、Ｔｉは、一般的に少量の添加で保磁力を低減させる効果のある元素として知られており、本発明においてもこれらの元素を加えることは問題ない。ただし、２％を超えると飽和磁束密度が低下し、保磁力Ｈｃが増大することから、２％以下とした。
Next, the impurities of the flat powder for electromagnetic wave absorbers of the present invention will be described.
Mn, Ni, Cu, Co, and Ti are generally known as elements having an effect of reducing the coercive force when added in a small amount, and there is no problem in adding these elements in the present invention. However, if it exceeds 2%, the saturation magnetic flux density is decreased and the coercive force Hc is increased, so that it is set to 2% or less.
上記電磁波吸収体用扁平粉末の作製方法は、粉砕法、ガスアトマイズ、水アトマイズ法等製法は問わない。さらに扁平化の方法はボールミル、アトライター等いずれも可能である。 The production method of the above-mentioned flat powder for electromagnetic wave absorber is not limited to a production method such as a pulverization method, a gas atomization method, or a water atomization method. Further, the flattening method can be any of a ball mill and an attritor.
本発明の電磁波吸収体用扁平粉末は、アスペクト比が１０以上、好ましくは２０以上とする。本発明の軟磁性粉末のアスペクト比を１０以上としたのは、アスペクト比が大きい程遮蔽効果が高くなるからである。 The flat powder for electromagnetic wave absorber of the present invention has an aspect ratio of 10 or more, preferably 20 or more. The reason why the aspect ratio of the soft magnetic powder of the present invention is 10 or more is that the shielding effect increases as the aspect ratio increases.
本発明の電磁波吸収体に適した柔軟若しくは硬質の絶縁材としては、例えば天然ゴム、クロロプレンゴム、ポリブタジエンゴム、ポリイソプレンゴム、エチレンプロピレンゴム、スチレンブタジエンゴム等の合成ゴム、フエノール樹脂、エポキシ樹脂、アクリル樹脂ポリプロピレン樹脂、ポリウレタン等の柔軟若しくは硬質のプラスチック等を用いる。
本発明の電磁波吸収体は、上記のような柔軟若しくは硬質の絶縁材に電磁波吸収体用扁平粉末を混練し、この混練物をロールでシート状にするなどの成形をして電磁波吸収体とする。
As a flexible or hard insulating material suitable for the electromagnetic wave absorber of the present invention, for example, natural rubber, chloroprene rubber, polybutadiene rubber, polyisoprene rubber, ethylene propylene rubber, styrene butadiene rubber and other synthetic rubber, phenol resin, epoxy resin, A flexible or hard plastic such as an acrylic resin polypropylene resin or polyurethane is used.
The electromagnetic wave absorber of the present invention is an electromagnetic wave absorber formed by kneading a flat powder for an electromagnetic wave absorber with the flexible or hard insulating material as described above, and forming the kneaded material into a sheet shape with a roll. .
以下、本発明について実施例によって具体的に説明する。
表１に示す組成からなる金属軟磁性粉末をＡｒガスアトマイズ法により、各種組成範囲の粉末を作製した。篩により分級（−１００μｍ）粒度以下の粉末を得る。この粉末を２時間、処理量２ｋｇ、ボール重量１０ｋｇなるアトライターなどの高エネルギーボールミルなどの手段で扁平化し、粉末厚みを段階的に変化させた。得られた粉末の各種厚みの軟磁性扁平粉末をそれぞれ磁気焼鈍処理して磁気特性を安定化した後、ゴムシートに混錬して電磁波吸収材として使用する。
Hereinafter, the present invention will be specifically described with reference to examples.
Powders in various composition ranges were prepared from metal soft magnetic powders having the compositions shown in Table 1 by the Ar gas atomization method. A powder having a particle size of -100 μm or less is obtained by sieving. The powder was flattened by means of a high energy ball mill such as an attritor having a throughput of 2 kg and a ball weight of 10 kg for 2 hours, and the powder thickness was changed stepwise. The obtained soft magnetic flat powders of various thicknesses are each magnetically annealed to stabilize the magnetic properties, and then kneaded into a rubber sheet and used as an electromagnetic wave absorber.
その時の測定項目としての、固有抵抗は、同組成のインゴット材を作製した後、５×５×２０ｍｍの試料を切り出し、ケルビンダブルブリッジ法にて測定した。また、耐食性は、３４３Ｋ、９５％湿度にて９６時間放置して発錆の有無を確認した。さらに、保磁力Ｈｃについては、Ｈｃメーターにより測定（飽和磁界：１４４ＫＡ／ｍ）した。得られた扁平粉末をシリコンゴム（１０ｍａｓｓ％）と混合し、２ロール成形法により、厚み１ｍｍのシート材を得る。このシート材から外径７ｍｍ、内径５ｍｍのリング試験片を得る。ネットワークアナライザーにより、周波数１０ＭＨｚのときの複素透過率（μ〃）を求めた。μ〃はノイズの吸収量を評価する方法でこの値が大きいほど、ノイズの吸収量が大きくなることを示す。 The specific resistance as a measurement item at that time was measured by a Kelvin double bridge method after cutting out a 5 × 5 × 20 mm sample after producing an ingot material having the same composition. In addition, the corrosion resistance was left at 343 K and 95% humidity for 96 hours to confirm the presence or absence of rusting. Further, the coercive force Hc was measured with a Hc meter (saturation magnetic field: 144 KA / m). The obtained flat powder is mixed with silicon rubber (10 mass%) to obtain a sheet material having a thickness of 1 mm by a two-roll molding method. A ring test piece having an outer diameter of 7 mm and an inner diameter of 5 mm is obtained from this sheet material. A complex transmittance (μ〃) at a frequency of 10 MHz was determined by a network analyzer. μ〃 is a method for evaluating the amount of noise absorption, and indicates that the larger this value, the larger the amount of noise absorption.
比較例Ｎｏ．２４はＣｒ含有量が高いために、固有抵抗およびＨｃが大きく、μ〃が小さい。比較例Ｎｏ．２５は不純物としてのＮｉ含有量が３％と高いために、Ｈｃが大きく、μ〃が小さい。比較例Ｎｏ．２６は不純物としてのＣｏ含有量が３％と高いために、Ｈｃが大きく、μ〃が小さい。比較例Ｎｏ．２７は不純物としてのＴｉ含有量が３％と高いために、Ｈｃが大きく、μ〃が小さい。比較例Ｎｏ．２８は不純物としてのＣｕ含有量が３％と高いために、Ｈｃは大きく、μ〃が小さい。 Comparative Example No. Since No. 24 has a high Cr content, specific resistance and Hc are large, and μ〃 is small. Comparative Example No. No. 25 has a high Ni content of 3% as an impurity, so Hc is large and μ〃 is small. Comparative Example No. No. 26 has a high content of Co as an impurity of 3%, so that Hc is large and μ〃 is small. Comparative Example No. No. 27 has a high Ti content as an impurity of 3%, so Hc is large and μ〃 is small. Comparative Example No. No. 28 has a high Cu content as an impurity of 3%, so Hc is large and μ〃 is small.
比較例Ｎｏ．２９は通常のＦｅ−９．６Ｓｉ−５．４Ａｌ、比較例Ｎｏ．３０はＦｅ−７８Ｎｉ（パーマロイ）を成分組成とするもので、比較例Ｎｏ．２９の場合は固有抵抗およびＨｃが小さく、かつ、μ〃も小さい。また、比較例Ｎｏ．３０の場合は、固有抵抗およびμ〃が小さく、かつ、Ｈｃが大きい。これに対し、本発明例であるＮｏ．１〜１８はいずれも本発明の条件を満足しており、その結果、固有抵抗、Ｈｃおよびμ〃に優れていることが分かる。 Comparative Example No. No. 29 is a normal Fe-9.6Si-5.4Al, Comparative Example No. 30 has a composition of Fe-78Ni (Permalloy). In the case of 29, the specific resistance and Hc are small, and μ〃 is also small. Comparative Example No. In the case of 30, the specific resistance and μ〃 are small and Hc is large. On the other hand, No. which is an example of the present invention. 1 to 18 all satisfy the conditions of the present invention, and as a result, it is understood that the specific resistance, Hc and μ〃 are excellent.
以上のように、本発明により従来にない高固有抵抗および低保磁力を得ることが可能となり、電磁波吸収特性に優れた電磁波吸収体用粉末および電磁波吸収体を得ることが出来る極めて優れたものである。
特許出願人 山陽特殊製鋼株式会社
代理人 弁理士 椎 名 彊
As described above, according to the present invention, an unprecedented high specific resistance and low coercive force can be obtained, and an electromagnetic wave absorber powder and an electromagnetic wave absorber excellent in electromagnetic wave absorption characteristics can be obtained. is there.
Patent Applicant Sanyo Special Steel Co., Ltd.
Attorney Atsushi Shiina
Claims (4)
Ｓｉ：９〜１２％、
Ａｌ：１〜５％、
Ｃｒ：１〜５％、
残部Ｆｅおよび不純物からなり、かつ該不純物としてのＮｉ、Ｃｏ、Ｔｉ、Ｍｎ、Ｃｕの何れも２％以下とすることを特徴とする電磁波吸収体用扁平粉末。 % By mass
Si: 9-12%,
Al: 1 to 5%,
Cr: 1 to 5%,
A flat powder for electromagnetic wave absorbers, comprising the balance Fe and impurities, and any of Ni, Co, Ti, Mn, and Cu as impurities is 2% or less.
Ｓｉ：９〜１２％、
Ａｌ：１〜５％、
Ｃｒ：１〜５％、
残部Ｆｅおよび不純物からなり、かつ該不純物としてのＮｉ、Ｃｏ、Ｔｉ、Ｍｎ、Ｃｕの何れも２％以下とする電磁波吸収体用扁平粉末を柔軟な絶縁材中に分散させて混練してなることを特徴とする電磁波吸収体。 % By mass
Si: 9-12%,
Al: 1 to 5%,
Cr: 1 to 5%,
A flat powder for an electromagnetic wave absorber composed of the balance Fe and impurities, and any of Ni, Co, Ti, Mn, and Cu as impurities being 2% or less is dispersed and kneaded in a flexible insulating material. An electromagnetic wave absorber characterized by.
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| CN102049515A (en) * | 2010-12-24 | 2011-05-11 | 湖州南浔闻天磁性材料有限公司 | Iron-silicon-aluminum soft magnetic powder and manufacturing method thereof |
| CN103173683A (en) * | 2013-03-29 | 2013-06-26 | 电子科技大学 | Alloy micropowder electromagnetic wave absorbent and preparation method thereof |
| CN105088109A (en) * | 2015-08-06 | 2015-11-25 | 电子科技大学 | Microwave frequency band electromagnetic wave absorbent and preparing method thereof |
| WO2016147943A1 (en) * | 2015-03-17 | 2016-09-22 | 山陽特殊製鋼株式会社 | Flat soft magnetic powder and production method therefor |
| JP2017028088A (en) * | 2015-07-22 | 2017-02-02 | Tdk株式会社 | Flat soft magnetic metal powder for magnetic sheet, magnetic sheet, and antenna coil |
| JP2017028087A (en) * | 2015-07-22 | 2017-02-02 | Tdk株式会社 | Flat soft magnetic metal powder for magnetic sheet, magnetic sheet, and antenna coil |
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| WO2018143472A1 (en) * | 2017-02-06 | 2018-08-09 | 山陽特殊製鋼株式会社 | Soft magnetic flat powder |
| JP2020057817A (en) * | 2020-01-06 | 2020-04-09 | 山陽特殊製鋼株式会社 | Manufacturing method of soft magnetic flat powder |
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| JP2002134308A (en) * | 2000-10-23 | 2002-05-10 | Sanyo Special Steel Co Ltd | Electromagnetic wave absorbent material powder |
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| JPS5739125A (en) * | 1980-08-20 | 1982-03-04 | Tohoku Metal Ind Ltd | Preparation of magnetic material |
| JP2002134308A (en) * | 2000-10-23 | 2002-05-10 | Sanyo Special Steel Co Ltd | Electromagnetic wave absorbent material powder |
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