하이브리드 도전성 필러를 이용한 섬유강화 복합재료의 전자파 차폐 효과에 관한 연구

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Recently, usage of electronic devices, such as computers, electronic ovens, printers, cellular phones etc, have been rapidly increased in our daily life as well as electronic industries. However, detrimental effect of the electromagnetic interference, generated by the electronic devices, has to be tackled for the safety of users. Hence, an interest in electromagnetic interference shielding materials has been continuously increased in the electronic industries. Metals, such as aluminiums, nickles, coppers, have been widely known as an excellent electromagnetic interference shielding material. But, metals have disadvantageous characteristics including heavy weight, expensive cost and corrosion.
The goal of this thesis is to investigate the influence of material composition on electromagnetic interference shielding characteristics. In order to achieve the goal, carbon black composites (PCb1∼PCb6) and carbon fiber reinforced composites (CFRP/CFRPS/CC/CCS/AC/ACS) are prepared to see their electromagnetic interference shielding effect.
For the test, the range of frequency between 300MHz ~ 1.5GHz is applied using ASTM D4935-89 standard method. The shielding effectiveness of the specimen was measured using the Anritsu 37369C vector network analyzer system and flanged coaxial transmission line measurement jig.
It is found that AC and ACS specimens show higher shielding efficiency than the other specimens at whole frequency range applied. In particular, at around 1.5GHz, the efficiency is more than 90dB, which is quite effective. In addition, PCb specimen appears to be the more conductive carbon black content, the higher shielding efficiency. But it also causes to increase the viscosity, resulting in difficulty of specimen fabrication. Through this study, it is confirmed that fiber-reinforced composites as well as carbon black coposites using conductive filler show various, but distinguished trend of efficiency depending on the characteristics of the materials used.
Alternative Title
A Study on Electromagnetic Interference Shielding Effectiveness of Fiber Reinforced Composite with Hybrid Conductive Filler
Alternative Author(s)
Choi, Myoung Il
일반대학원 기계공학과
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Table Of Contents
제 1 장 서 론 1
1.1 연구배경 및 관련연구 1
1.2 연구목적 및 방법 5

제 2 장 이론적 고찰 7
2.1 전자파란 7
2.2 전자파의 특성 9
2.3 전자파 차폐이론 11
2.4 전자파 차폐효율 측정 방법 14
2.5 전자파 차폐효율 측정 장비 15
2.6 카본블랙의 도전성 19

제 3 장 시험편 제작 20
3.1 카본블랙 복합재료의 제작 20
3.1.1 시험편 재료 20
3.1.2 카본블랙페이스트 시험편 제작 21
3.2 섬유강화 복합재료의 제작 방법 26
3.2.1 시험편 재료 26
3.2.2 섬유강화 복합재료 시험편 제작 27

제 4 장 실험 결과 및 고찰 32
4.1 카본블랙 함량에 따른 전자파 차폐효율 32
4.2 카본블랙페이스트 희석비에 따른 전자파 차폐효율 33
4.3 카본블랙페이스트 시험편 적층에 의한 전자파 차폐효율 37
4.4 CFRP와 CFRPS 시험편의 전자파 차폐효율 38
4.5 CC와 CCS 시험편의 전자파 차폐효율 40
4.6 AC와 ACS 시험편의 전자파 차폐효율 41
4.7 전자파 차폐효율 실험 결과 43

제 5 장 결론 47


감사의 글
조선대학교 대학원
최명일. (2012). 하이브리드 도전성 필러를 이용한 섬유강화 복합재료의 전자파 차폐 효과에 관한 연구.
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General Graduate School > 3. Theses(Master)
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