JPS59138399A - Electromagnetic wave absorber and method of producing same - Google Patents
Electromagnetic wave absorber and method of producing sameInfo
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- JPS59138399A JPS59138399A JP1322483A JP1322483A JPS59138399A JP S59138399 A JPS59138399 A JP S59138399A JP 1322483 A JP1322483 A JP 1322483A JP 1322483 A JP1322483 A JP 1322483A JP S59138399 A JPS59138399 A JP S59138399A
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- electromagnetic wave
- wave absorber
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- magnetite
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Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
本発明はセラミックス製電磁波吸収体とその製造法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ceramic electromagnetic wave absorber and a method for manufacturing the same.
近年、通信技術、輸送機関、各種電気機器等の進歩に伴
い、これらから発生する電磁波雑音が周囲に及ぼす障害
が急増している。特に大気中を流れる電磁波の量がおび
ただしい地域では、屋内で通信機器を利用する場合、ア
ンテナを介して受信される所要電磁波のみならず、不−
要な雑音が直接機器に入信することによって通信が妨害
されることが少なくない。この様な不要雑音を適当な建
材に吸収させ、所要電磁波のみを受信することは通信機
器利用者の望むところである。2. Description of the Related Art In recent years, with advances in communication technology, transportation, various electrical devices, etc., the electromagnetic noise generated by these devices is causing a rapid increase in the number of disturbances caused to the surroundings. Particularly in areas where there is a large amount of electromagnetic waves flowing through the atmosphere, when using communication equipment indoors, not only the required electromagnetic waves received via the antenna, but also the unnecessary
Communication is often disrupted by unwanted noise directly entering the equipment. It is the desire of communication equipment users to absorb such unnecessary noise into appropriate building materials and receive only the necessary electromagnetic waves.
電磁波吸収材としては、従来からプラスチックゴム専有
ｔａ ｌｆＡ料に金属を混入した物やフェライト焼結体
が知られているが、前者は耐熱性及び耐火性に乏しいた
めに、また後者は重量が重すぎるためにいずれも建材に
は適さなかった。As electromagnetic wave absorbing materials, materials made by mixing metal into talfA material, which is a proprietary material for plastic rubber, and ferrite sintered bodies have been known, but the former has poor heat resistance and fire resistance, and the latter is heavy in weight. Because of their excessive size, they were not suitable as building materials.
本発明は、上述の不要雑音を遮断し得る、建材として利
用可能な電磁波吸収体を提供するものである。The present invention provides an electromagnetic wave absorber that can block the above-mentioned unnecessary noise and can be used as a building material.
本発明の要旨とするところは、ケイ灰石１００重量部と
マグネタイト５０〜３００重量部とが均質に分散しあっ
た電磁波吸収体に存する。The gist of the present invention resides in an electromagnetic wave absorber in which 100 parts by weight of wollastonite and 50 to 300 parts by weight of magnetite are homogeneously dispersed.
また前記特定発明と関連する同様に本発明の要旨とする
ところは、ケイ灰石とマグネタイトを混合し成形後、焼
成することを特徴とする電磁波吸収体の製造法、鉄、シ
リカ及びカルシアを混合し、ゾノトライト又はトバモラ
イトが生成する条件で水熱処理を施し、成形後焼成する
ことを特徴とする電磁波吸収体の製造法及び鉄、シリカ
及びカルシアを混合し成形後ゾノトライト又はトバモラ
イトが生成する条件で水熱処理を施し、次いで焼成する
ことを特徴とする電磁波吸収体の製造法に存する。In addition, the gist of the present invention, which is related to the above-mentioned specific invention, is a method for producing an electromagnetic wave absorber characterized by mixing wollastonite and magnetite, molding, and firing, and mixing iron, silica, and calcia. A method for producing an electromagnetic wave absorber, characterized in that hydrothermal treatment is performed under conditions that produce xonotrite or tobermorite, followed by firing after molding, and a method for producing an electromagnetic wave absorber characterized in that iron, silica, and calcia are mixed and water is treated under conditions that produce xonotrite or tobermorite after molding. The present invention relates to a method for producing an electromagnetic wave absorber, which comprises performing heat treatment and then firing.
以下実施例及び比較例によりこの発明を具体的に説明す
る。The present invention will be specifically explained below using Examples and Comparative Examples.
実施例１
市販ケイ灰石１００重量部とマグネタイト１００重量部
を混合し粒径１０μｍ以下に摩砕、混合粉末を金型に充
填して圧力１ｔｏｎ／ｃｎｉで加圧成形した後、大気中
温度９００℃、保持時間６０分の条件で焼成することに
よって、大きさ１００×１’００Ｘ１０（龍）の試料１
を作成した。得られた試料と第１図又は第２図に示す測
定装置を用いて次の要領で電磁波吸収効果を評価した。Example 1 100 parts by weight of commercially available wollastonite and 100 parts by weight of magnetite were mixed, ground to a particle size of 10 μm or less, the mixed powder was filled into a mold and pressure-molded at a pressure of 1 ton/cni, and then heated at a temperature of 900 in air. Sample 1 of size 100 x 1'00 x 10 (dragon)
It was created. Using the obtained sample and the measuring device shown in FIG. 1 or 2, the electromagnetic wave absorption effect was evaluated in the following manner.
第１図は測定装置の配置を示す平面図で、第２図は同じ
く正面図である。１は本実施例で作成した試料、２はア
ルミニウム製の反射板、３は反射電磁波を受信するため
のアンテナ、４は火花発振器、５は反射板に反射しない
でアンテナに入信する電磁波を遮断する遮断板、６は増
幅機及び記録計、７は反射板２と火花発振機４と遮断板
５とを設置する台をそれぞれ示す。測定の際には、上記
試料１を反射板２の火花発振機と向い合う面に重ね合わ
せた後、火花発振機４から発振され次いで上記試料によ
って反射した電磁波をアンテナ３で受信するごとによっ
て、火花発振機から発振された電磁波の減衰量を測定し
た。測定結果を第３図に示す。FIG. 1 is a plan view showing the arrangement of the measuring device, and FIG. 2 is a front view. 1 is a sample prepared in this example, 2 is an aluminum reflector, 3 is an antenna for receiving reflected electromagnetic waves, 4 is a spark oscillator, and 5 is for blocking electromagnetic waves entering the antenna without being reflected by the reflector. A blocking plate 6, an amplifier and a recorder, and 7 a stand on which the reflecting plate 2, the spark oscillator 4, and the blocking plate 5 are installed, respectively. During measurement, after placing the sample 1 on the surface of the reflector 2 facing the spark oscillator, each time the antenna 3 receives the electromagnetic waves oscillated from the spark oscillator 4 and then reflected by the sample, We measured the amount of attenuation of the electromagnetic waves oscillated by the spark oscillator. The measurement results are shown in Figure 3.
実施例２
生石灰とクリストバライトをＣａ ／ Ｓ ｉ原子比が
１．２となるように混合し粒径１０μｍ以下は摩砕し、
平均粒径１５０μｍの鉄粉を混合物１００重量部に対し
て８０重量部添加した後、再び混合し、次いで混合粉末
を攪拌式加圧容器に充填した後、温度２５０℃、保持時
間５時間の条件で水熱処理を施した。水熱処理後の粉末
の一部を分析した結果、ゾノライト、マグネタイト及び
少量のトバモライトの生成が確認された。水熱処理後の
残りの粉末を乾燥し圧力１ ｔｏｎ ’ ／ ｃｎｌで
加圧成形し、大気中温度８００℃、保持時間６０分の条
件で焼成することによって大きさ１００ｘｌＯＯｘｌＯ
（顛）の試料３を作成した。周知の方法で分析した結果
、ケイ灰石とマグネタイトが生成していた。Example 2 Quicklime and cristobalite were mixed so that the Ca/Si atomic ratio was 1.2, and the particles with a particle size of 10 μm or less were ground.
After adding 80 parts by weight of iron powder with an average particle size of 150 μm to 100 parts by weight of the mixture, the mixture was mixed again, and the mixed powder was then filled into a stirring pressurized container, followed by a temperature of 250°C and a holding time of 5 hours. was subjected to hydrothermal treatment. Analysis of a portion of the powder after hydrothermal treatment confirmed the formation of zonolite, magnetite, and a small amount of tobermorite. The powder remaining after the hydrothermal treatment is dried, pressure-molded at a pressure of 1 ton'/cnl, and fired in the atmosphere at a temperature of 800°C and a holding time of 60 minutes to obtain a size of 100xlOOxlO.
(2) Sample 3 was created. Analysis using a well-known method revealed that wollastonite and magnetite were produced.
この試料２を用いて実施例１と同様に電磁波吸収効果を
評価した結果を第３図に示す。Using this sample 2, the electromagnetic wave absorption effect was evaluated in the same manner as in Example 1. The results are shown in FIG.
実施例３
鉄粉の添加量が生石灰とクリストバライトとの混合物１
００重量部に対して２００重量部である以外は実施例２
と同一の条件で試料３を作成した。Example 3 The amount of iron powder added is 1 in a mixture of quicklime and cristobalite
Example 2 except that the amount was 200 parts by weight relative to 00 parts by weight.
Sample 3 was prepared under the same conditions as above.
分析の結果、ケイ灰石とマグネタイトが生成していた。Analysis revealed that wollastonite and magnetite were produced.
試料３を用いて電磁波吸収効果を評価した結果を第３図
に示す。FIG. 3 shows the results of evaluating the electromagnetic wave absorption effect using Sample 3.
実施例４
生石灰とクリストバライトをＣａ／Ｓｉ原子比が１．０
となるように混合し粒径１０μｍ以下に摩砕し、平均粒
径５０μｍの鉄粉を混合物１００重量部に対し１５０重
量部添加した後、再び混合し、圧力１ｔｏｎ／ａｄで加
圧成形し、成形体に温度３００℃、保持時間３時間の条
件で水熱処理を施した。Example 4 Quicklime and cristobalite with Ca/Si atomic ratio of 1.0
After mixing and grinding to a particle size of 10 μm or less, adding 150 parts by weight of iron powder with an average particle size of 50 μm to 100 parts by weight of the mixture, mixing again and press molding at a pressure of 1 ton/ad, The molded body was subjected to hydrothermal treatment at a temperature of 300° C. and a holding time of 3 hours.
水熱処理後の成形体を分析した結果、ゾノトライト、１
−ハモライト及びマグネタイトの生成が確認された。次
に水熱処理後の成形体を大気中温度８００℃保持時間６
０分の条件で焼成することによって大きさ１００ｘｌＯ
ＯｘｌＯ（ｍ）の試料４を作成した。分析の結果、ケイ
灰石とマグネタイトが生成していた。実施例１と同様に
して電磁波吸収効果を測定した結果を第３図に示す。As a result of analyzing the molded body after hydrothermal treatment, xonotlite, 1
- Generation of hamolite and magnetite was confirmed. Next, the molded body after hydrothermal treatment was held at a temperature of 800°C in the atmosphere for 6 hours.
The size is 100xlO by firing under the conditions of 0 minutes.
Sample 4 of OxlO(m) was prepared. Analysis revealed that wollastonite and magnetite were produced. The results of measuring the electromagnetic wave absorption effect in the same manner as in Example 1 are shown in FIG.
比較例
ポリプロピレン１００重量部に平均粒径２５０μｍのフ
ェライト粉末を混合し、押出機を用いて厚さ２鮪のシー
トを作成した。このシートを１００龍四方に切断したも
のを５枚重ねることによって上記各実施例と比較するた
めの試料５を得た。実施例１と同様にして電磁波吸収効
果を測定した結果を第３図に示す。Comparative Example Ferrite powder having an average particle size of 250 μm was mixed with 100 parts by weight of polypropylene, and a sheet with a thickness of 2 mm was prepared using an extruder. Sample 5 was obtained for comparison with each of the above examples by cutting this sheet into 100 square pieces and stacking five sheets. The results of measuring the electromagnetic wave absorption effect in the same manner as in Example 1 are shown in FIG.
第３図かられかるように、本発明の技術的範囲に属する
試料１〜４はいずれも従来の電磁波吸収材料である試料
５と同等の電磁波吸収効果を有していた。しかも本発明
電磁波吸収体はその母相にケイ灰石を多量に含有してい
るために軽量であり、また断熱性、１ｌｉｉ＋熱性及び
耐火性に優れている。As can be seen from FIG. 3, Samples 1 to 4, which fall within the technical scope of the present invention, all had the same electromagnetic wave absorption effect as Sample 5, which is a conventional electromagnetic wave absorbing material. Moreover, since the electromagnetic wave absorber of the present invention contains a large amount of wollastonite in its matrix, it is lightweight and has excellent heat insulation properties, 1lii+ heat properties, and fire resistance.
次に本発明の電磁波吸収体を構成するケイ灰石とマグネ
タイトの含有比と該電磁波吸収体の製造法を前述の槌に
限定した理由を述べる。Next, the content ratio of wollastonite and magnetite constituting the electromagnetic wave absorber of the present invention and the reason why the manufacturing method of the electromagnetic wave absorber was limited to the above-mentioned hammer will be described.
ケイ灰石とマグネタイトの比については、ケイ灰石１０
０重量部に対してマグネタイトが５０重量部未満の場合
は従来品と同等の電磁波吸収効果が得られず、３００重
量部を超えると効果の向上は見られない上６ひ軽量化を
阻害するので、その含有比をケイ灰石１００重量部に対
し、マグネタイトが５θ〜３００重量部に限定した。Regarding the ratio of wollastonite and magnetite, wollastonite 10
If the amount of magnetite is less than 50 parts by weight, the electromagnetic wave absorption effect equivalent to that of conventional products cannot be obtained, and if it exceeds 300 parts by weight, no improvement in the effect will be seen, and the weight reduction will be hindered. The content ratio of magnetite was limited to 5θ to 300 parts by weight per 100 parts by weight of wollastonite.
本発明電磁渡り成体は実施例１に示したように普通焼結
法によって製造すれば廉価に製造することができるが、
用途に応じて実施例２〜４に示したような水熱処理を施
した場合には、上記の利点を損わずに次に示す利点を付
加的に有することができる。The electromagnetic bridge body of the present invention can be manufactured at low cost if it is manufactured by the ordinary sintering method as shown in Example 1.
When hydrothermal treatment as shown in Examples 2 to 4 is performed depending on the application, the following additional advantages can be obtained without impairing the above-mentioned advantages.
イ）製造工程の中間でゾノトライト針状結晶又はトバモ
ライト板状結晶が生成し、これらが相互に絡み合った網
状組織の中にマグネタイトが分散しているので、焼成後
にゾノトライト又はトバモライトがケイ灰石に変化して
も体積収縮が極めて小さく、寸法精度が良くなる。b) Zonotlite needle crystals or tobermorite plate crystals are formed in the middle of the manufacturing process, and magnetite is dispersed in the network structure in which these crystals are intertwined with each other, so after firing, the xonotlite or tobermorite changes to wollastonite. However, the volumetric shrinkage is extremely small and the dimensional accuracy is improved.
口）上記網状組織が焼成後にも維持されるので、得られ
る電磁波吸収体は多孔質であり、このことが建材して不
可欠な軽量化、断熱性、耐熱性及び耐火性を助長する。Since the network structure is maintained even after firing, the resulting electromagnetic wave absorber is porous, which promotes weight reduction, heat insulation, heat resistance, and fire resistance, which are essential for building materials.
尚、水熱処理の条件はゾノトライト又はトバモライトが
生成する条件であれば実施例２〜４に示した条件に限定
されないが、カルシアとシリカとの反応性と加圧容器の
耐熱性及び耐圧性とを考慮すれば、温度は２００〜６０
０℃、静水圧力は３０〜４００気圧が好ましい。The conditions for the hydrothermal treatment are not limited to those shown in Examples 2 to 4 as long as xonotlite or tobermorite is produced, but depending on the reactivity of calcia and silica and the heat resistance and pressure resistance of the pressurized container. Considering that the temperature is 200-60
Preferably, the temperature is 0°C and the hydrostatic pressure is 30 to 400 atm.
以上の通り、本発明によれば建材として好適な電磁波吸
収体が得られる。As described above, according to the present invention, an electromagnetic wave absorber suitable as a building material can be obtained.
第１図は電磁波の反射減衰量を測定する装置の配置を示
す平面図で、第２図は同じく正面図である。第３図は本
発明の実施例及び比較例によって得られる電磁波吸収体
を用いて種々の周波数におりる電磁波の反射減衰量を測
定した結果を表わすグラフである。
特許出願人 日本特殊陶業株式会社
代表者 小川修次
−４
第１図
第８図
■ 婚 復諷 （ｔ”ｕ−＋ｚ）
昭和５８年 ３月λ斗日
特許庁長官 若 杉 和 夫 殿
１、事件の表示
昭和５８年 特許願 第１３２２４号
２、発明の名称
電磁波吸収体とその製造法
３、補正をする者
事件との関係 特許出願人
住 所 郵便番号 ４６７−９１
名古屋市瑞穂区高辻町１４番１８号
４、補正の対象
明細書中、発明の詳細な説明の欄。
５、補正の内容
別紙の通り
■、明細書第５頁、５行目〜６行目を下記の文に訂正し
ます。
「た結果、ゾノトライト、及びマグネタイトの生成が確
認された。水熱処理後の残」
２、同５頁、下から４行目〜５行目を下記の文に訂正し
ます。
「混合物１００重量部に対して２００重量部であること
と、温度が２００℃であること以外は実施例２と同一の
条件で試料３を作成した。」３、同第６頁、６行目中、
ｒ３００Ｊをｒ２３０Ｊに訂正します。
４、同第８頁、１０行目中、「イトが分散しているので
、」を「イトが均質に分散してい′るので、」に訂正し
ます。
５、同第８頁、１３行目と１４行目の間に次の文を挿入
します。
「特にゾノライトの場合はトポタクヂックな反応でケイ
灰石に変化するので、上記効果が顕著である。」
６、同第９頁、２行目〜３行目を下記の文に訂正します
。
「すれば、温度は１５０〜４００ ”ｃ、静水圧力は３
０〜４００気圧が好ましい、又、温度が２００℃以下で
はトバモライトが生成し、２５０ ’Ｃ以上でゾノトラ
イトが生成し、２００〜２５０ ’Ｃで゛両者が共存す
る。
以上FIG. 1 is a plan view showing the arrangement of an apparatus for measuring the return loss of electromagnetic waves, and FIG. 2 is a front view. FIG. 3 is a graph showing the results of measuring the return loss of electromagnetic waves at various frequencies using the electromagnetic wave absorbers obtained according to the examples and comparative examples of the present invention. Patent applicant: NGK SPARK PLUG Co., Ltd. Representative: Shuji Ogawa-4 Fig. 1 Fig. 8 ■ Marriage renewal (t”u-+z) March 1980 λ Tohito Commissioner of the Patent Office Kazuo Wakasugi 1; Indication of the case 1982 Patent Application No. 13224 2 Name of the invention Electromagnetic wave absorber and its manufacturing method 3 Person making the amendment Relationship to the case Patent applicant Address Postal code 467-91 14 Takatsuji-cho, Mizuho-ku, Nagoya City No. 18 No. 4, Detailed explanation of the invention in the specification subject to amendment. 5. Contents of amendment As shown in the attached sheet ■, Page 5 of the specification, lines 5 to 6 are corrected to the following sentence: ``As a result, the formation of xonotrite and magnetite was confirmed. Residue after hydrothermal treatment'' 2. On page 5, lines 4 and 5 from the bottom are corrected to the following sentence. “Sample 3 was prepared under the same conditions as Example 2 except that the amount was 200 parts by weight based on 100 parts by weight of the mixture and the temperature was 200°C.” 3, page 6, line 6 During,
Correct r300J to r230J. 4. On page 8, line 10 of the same text, ``Because it is dispersed,'' should be corrected to ``Because it is homogeneously distributed.'' 5. Insert the following sentence between lines 13 and 14 on page 8. ``In the case of zonolite in particular, the above effect is remarkable because it changes to wollastonite through a topotactic reaction.'' 6. Correct the following sentence from page 9, lines 2 to 3. ``Then the temperature is 150-400''c and the hydrostatic pressure is 3
A temperature of 0 to 400 atm is preferred; at a temperature of 200°C or lower, tobermorite is produced; at a temperature of 250'C or higher, xonotrite is produced; and at a temperature of 200 to 250'C, both coexist. that's all
Claims (4)
０重量部とが均質に分散しあった電磁波吸収体。(1) 100 parts by weight of wollastonite and 50 to 30 parts by weight of magnetite
An electromagnetic wave absorber in which 0 parts by weight are uniformly dispersed.
ることを特徴とする電磁波吸収体の製造法。(2) A method for producing an electromagnetic wave absorber, which comprises mixing wollastonite and magnetite, molding, and then firing.
又はトバモライトが生成する条件で水熱処理を施し、成
形後焼成することを特徴とする電磁波吸収体の製造法。(3) A method for producing an electromagnetic wave absorber, which comprises mixing iron, silica, and calcia, subjecting the mixture to hydrothermal treatment under conditions that produce xonotlite or tobermorite, molding, and then firing.
〜ライト又はトバモライトが生成する条件で水熱処理を
施し、次いで焼成することを特徴とする電磁波吸収体の
製造法。(4) After mixing iron, silica and calcia and molding, Gino 1
- A method for producing an electromagnetic wave absorber, which comprises performing hydrothermal treatment under conditions that produce light or tobermorite, and then firing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1322483A JPS59138399A (en) | 1983-01-28 | 1983-01-28 | Electromagnetic wave absorber and method of producing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1322483A JPS59138399A (en) | 1983-01-28 | 1983-01-28 | Electromagnetic wave absorber and method of producing same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59138399A true JPS59138399A (en) | 1984-08-08 |
| JPH025032B2 JPH025032B2 (en) | 1990-01-31 |
Family
ID=11827202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1322483A Granted JPS59138399A (en) | 1983-01-28 | 1983-01-28 | Electromagnetic wave absorber and method of producing same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59138399A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63152299U (en) * | 1986-11-19 | 1988-10-06 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54110496A (en) * | 1978-02-17 | 1979-08-29 | Tdk Corp | Material for electric wave absorptive body |
| JPS54110497A (en) * | 1978-02-17 | 1979-08-29 | Tdk Corp | Material for electric wave absorptive body |
-
1983
- 1983-01-28 JP JP1322483A patent/JPS59138399A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54110496A (en) * | 1978-02-17 | 1979-08-29 | Tdk Corp | Material for electric wave absorptive body |
| JPS54110497A (en) * | 1978-02-17 | 1979-08-29 | Tdk Corp | Material for electric wave absorptive body |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63152299U (en) * | 1986-11-19 | 1988-10-06 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH025032B2 (en) | 1990-01-31 |
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