KR920003564B1 - Using for magnetite radio absorbing apparatus - Google Patents
Using for magnetite radio absorbing apparatus Download PDFInfo
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- KR920003564B1 KR920003564B1 KR1019900002426A KR900002426A KR920003564B1 KR 920003564 B1 KR920003564 B1 KR 920003564B1 KR 1019900002426 A KR1019900002426 A KR 1019900002426A KR 900002426 A KR900002426 A KR 900002426A KR 920003564 B1 KR920003564 B1 KR 920003564B1
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- South Korea
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- magnetite
- powder
- wave absorber
- carbon
- manufacturing cost
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
Abstract
Description
본 발명은 마그네타이트를 이용한 전파흡수체에 관한 것이며 특히 마그네타이트 카본전파 흡수체에 관한 것이다.The present invention relates to a radio wave absorber using magnetite, and more particularly, to a magnetite carbon radio wave absorber.
전파가 정보매체로서 그 사용이 빈번하여 점에따라 각종 전자기기의 오동작, 통신장애의 발생, 선박의 안전운항 저해등을 방지하거나 탐색레이다로부터 선박, 항공기등의 탐지를 피하기 위하여 전파흡수체가 사용되고 있다.As radio waves are frequently used as information carriers, radio wave absorbers are used to prevent malfunctions of various electronic devices, communication failures, impediment of safe operation of ships, and to avoid detection of ships and aircraft from search radars. .
상기한 전파흡수체는 초기에는 도전손실을 이용한 카본전파흡수체가 그 뒤에 자성손실을 이용한 연질페라이트 전파흡수체가 공지되었으나 이들은 특히 그 두께가 두꺼워서 다량의 흡수재료가 필요하므로 제조원가가 높아지는 결점이 있었다.The above-mentioned radio wave absorber is known as a carbon wave absorber using a conductive loss initially, followed by a soft ferrite wave absorber using a magnetic loss. However, these radio absorbers have a drawback in that the manufacturing cost increases due to the large thickness of the absorber.
이 제조원가의 절감을 위하여 최근에 카본페라이트 전파흡수체가 개발되어 실용화되고 있으며 그 조성물은 연질페라이트 분체, 카본분체, 고무 또는 합성수지등의 보지재로 되어 있다. 그러나 상기한 카본 페라이트 전파흡수체는 내열성도 양호하고 제조원가(두께를 얇게 함으로서 생김)는 낮아졌으나 상기한 연질페라이트 분체는 산화철(Fe2O3)에 Mn, Zn, Ni등의 2가금속을 혼합한 것이므로 연질페라이트의 단위중량당 가격에는 변함이 없어 보다 가격이 저렴한 흡수재료의 개발이 요망되고 있는 실정이다.In order to reduce the manufacturing cost, carbon ferrite radio wave absorbers have been recently developed and put into practical use, and the composition is made of a holding material such as soft ferrite powder, carbon powder, rubber or synthetic resin. However, the above-mentioned carbon ferrite wave absorber has good heat resistance and lowers the manufacturing cost (produced by thinning the thickness), but the above-mentioned soft ferrite powder is obtained by mixing divalent metals such as Mn, Zn, and Ni with iron oxide (Fe 2 O 3 ). Since the price per unit weight of the soft ferrite does not change, it is desirable to develop a cheaper absorbent material.
본원발명자는 상기한 저렴한 가격의 흡수재료의 개발에 부응하고자 많은 연구끝에 제철공장의 압연공정등에서 생기는 산업폐기물인 밀스케일(mill scale)을 전파흡수체의 흡수재료로서 활용 할 수 있는 방안을 발명하였다.The inventors of the present invention invented a method that can utilize the mill scale, which is an industrial waste generated in the rolling process of the steel mill, as an absorbent material of the radio wave absorber in order to meet the development of the low-cost absorbent material described above.
본 발명의 목적은 밀스케일의 주성분인 마그네타이트(Fe3O4,magnetite)를 활용하여 가격이 저렴하고 성능이 양호한 전파흡수체를 제공하는 것을 목적으로 한다.An object of the present invention is to provide a radio wave absorber having low cost and good performance by utilizing magnetite (Fe 3 O 4 , magnetite) which is the main component of mill scale.
본 발명은 상기한 목적달성을 위하여 마그네타이트분체와 카본분체를 고무 또는 합성수지등의 보지재에 분산혼합한 것을 특징으로 한다. 이하 실시예에 의거 상세히 설명한다.The present invention is characterized in that the magnetite powder and the carbon powder are dispersed and mixed in a holding material such as rubber or synthetic resin in order to achieve the above object. It will be described in detail based on the following examples.
[실시예 1]Example 1
제철공장의 압연공정에서 생기는 밀스케일을 자력선별법에 의하여 마그네타이트와 산화철(Fe2O3)을 분리하고 마그네타이트를 미크론 단위로 분쇄하여 마그네타이트 분체를 얻었다. 동 마그네타이트 분체 50중량%와 카본분체 25중량% 및 합성수지 보지재 25중량%를 혼련한 후 압출하여 두께 2.5mm, 폭 7.5mm의 스트립을 만들어 전자레인지의 문짝에 설치하고 전파누설량을 KS의 전자레인지 누설전파 측정법에 따라 측정한 결과 전파누설량이 0.25mw/cm2로 양호한 결과를 얻었다.The mill scale produced in the rolling mill of the steel mill was separated by magnetite and iron oxide (Fe 2 O 3 ), and the magnetite was ground in micron units to obtain magnetite powder. 50% by weight of copper magnet powder, 25% by weight carbon powder and 25% by weight synthetic resin holding material are kneaded and extruded to make strips 2.5mm thick and 7.5mm wide and installed at the door of the microwave oven. As a result of the leakage propagation measurement, a good amount of radio leakage was 0.25mw / cm 2 .
[실시예 2]Example 2
실시예 1에 의하여 얻은 마그네타이트 분체 10중량%와 카본 분체 85중량% 및 합성수지 5중량%를 혼련한 후 1.47mm두께의 씨이트상 전파흡수체를 만들어 반사전력법에 의하여 전파흡수능을 측정한 결과 중심 주파수 9.4GHz에서 반사감쇠량 22dB의 양호한 특성을 가짐이 확인되었다.10% by weight of the magnetite powder obtained in Example 1, 85% by weight of carbon powder, and 5% by weight of synthetic resin were kneaded to form a sheet-like wave absorber having a thickness of 1.47 mm. It was confirmed that it had a good characteristic of the reflection attenuation amount of 22dB at GHz.
[실시예 3]Example 3
실시예 1에 의하여 얻은 마그네타이트 분체 80중량%와 카본분체 10중량% 및 합성수지 10중량%를 혼련한 후 2.65mm두께의 씨이트상 전파흡수체를 만들어 반사전력법에 의하여 전파흡수 능을 측정한 결과 중심 주파수 5.6GHz에서 반사감쇠량 24.5dB의 양호한 특성이 얻어졌다.80% by weight of the magnetite powder obtained in Example 1, 10% by weight of carbon powder, and 10% by weight of synthetic resin were kneaded to form a sheet-shaped wave absorber having a thickness of 2.65 mm, and the resultant wave absorption capability was measured by the reflected power method. Good characteristics with a reflection attenuation of 24.5 dB at 5.6 GHz were obtained.
[실시예 4]Example 4
실시예 1에 의하여 얻은 마그네타이트 분체 32중량%와 카본 분체 32중량%를 에폭시 수지 36중량%에 혼합교반하여 도료상으로 제조하여 이를 알미늄판위에 1.48mm의 두께를 도포하여 건조한 후 반사전력법으로 전파흡수능을 측정한 결과 중심주파수 9.4GHz에서 반사감쇠량 23.8dB의 양호한 특성이 얻어졌다.32 wt% of the magnetite powder and 32 wt% of the carbon powder obtained in Example 1 were mixed and stirred in 36 wt% of the epoxy resin to prepare a coating material, which was coated with a thickness of 1.48 mm on an aluminum plate and dried and then propagated by the reflected power method. As a result of measuring the absorption capability, a good characteristic of 23.8 dB of reflection attenuation was obtained at the center frequency of 9.4 GHz.
[비교예][Comparative Example]
연질페라이트 분체 71중량%와 카본분체 11중량% 및 합성수지 보지재 18중량%를 실시예 1과 같이 제작한 후 전파누설량을 측정한 결과 전파누설량이 0.27mw/cm2이었다.71 wt% of the soft ferrite powder, 11 wt% of the carbon powder, and 18 wt% of the synthetic resin retaining material were prepared in the same manner as in Example 1, and then the amount of the radio leakage was measured to be 0.27mw / cm 2 .
이상과 같이 본 발명은 제철공장의 압연공정등에서 생기는 산업폐기물인 밀스케일로 부터 손쉽게 얻어지는 마그네타이트를 전파 흡수체의 흡수재료로 사용하므로서 종래의 카본페라이트 전파 흡수체에 비하여 그 제조원가를 1/3로 절감할 수 있을 뿐아니라 그 성능에 있어서도 종래의 카본페라이트 전파흡수체에 비하여 대등하거나 양호한 것이다.As described above, the present invention can reduce the manufacturing cost by 1/3 compared to the conventional carbon ferrite radio wave absorber by using the magnetite easily obtained from the mill scale, which is an industrial waste generated in the rolling process of the steel mill, as the absorber material of the radio wave absorber. Not only that, but also its performance is comparable or better than that of the conventional carbon ferrite radio wave absorber.
또한 부수적으로 밀스케일은 산업폐기물로서 그 처치가 곤란하였으나 이를 활용할 수 있으므로 공해 방지에도 공헌하는등의 효과가 있다.Incidentally, mill scale is an industrial waste, but its treatment was difficult, but it can be utilized to contribute to the prevention of pollution.
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KR1019900002426A KR920003564B1 (en) | 1990-02-26 | 1990-02-26 | Using for magnetite radio absorbing apparatus |
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KR1019900002426A KR920003564B1 (en) | 1990-02-26 | 1990-02-26 | Using for magnetite radio absorbing apparatus |
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KR910016111A KR910016111A (en) | 1991-09-30 |
KR920003564B1 true KR920003564B1 (en) | 1992-05-04 |
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