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X-Band 영역에서의 세라믹/샌더스트-알루미노실리케이트 복합재의 초고온 전자파 흡수 거동

Ultra-high Temperature EM Wave Absorption Behavior for Ceramic/Sendust-aluminosilicate Composite in X-band

최원우|남영우|심동영|신준형|최광식
한국복합재료학회 (The Korean Society For Composite Materials)|2022.06|Composites Research|제35권 제3호|pp. 201-215|DOI 10.7234/composres.2022.35.3.201

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키워드

전파흡수구조Radar-absorbing structure초고온 환경세라믹 섬유알루미노실리케이트 세라믹 레진샌더스트 자성입자Ultra-high temperature conditionAluminosilicate ceramic matrixCeramic fiberSendust magnetic particle
주제분류재료공학

초록

본 연구에서는 초고온 환경에서 내화학성 및 열적 안정성이 우수한 지오폴리머 기반의 알루미노실리케이트 레진과 세라믹 섬유를 활용한, 목표주파수 X-band(8.2 GHz to 12.4 GHz)에서 전자파를 흡수하는 세라믹 복합재(Radar-absorbing ceramic composite, RACC)를 구현하였다. 주 성분이 FeSi인 판형 구조의 샌더스트 자성 입자를 분산시킨 알루미노실리케이트 레진은 목표 주파수 대역에서 자성 및 유전손실 특성을 발휘하였고, 입도와 무게분율별 유전특성을 Cole-Cole Plot으로 표현하였다. 샌더스트가 분산된 알루미노실리케이트 레진의 미세구조, 화학적 성분 및 결정, 자기 및 열적 특성 등을 분석하기 위해 SEM, EDS, VSM 및 TGA를 측정하였다. 샌더스트의 입도크기 35 μm, 무게분율 40 wt.%를 분산시킨 레진의 유전손실 특성을 활용하여, X-band에서 약 1.51 GHz 대역폭에 대해 -10 dB 이하의 반사손실 성능을 발휘하는 단층형(t = 1.585 mm) RACC를 설계 및 제작하였다. 제작된 RACC의 초고온(25oC to 1,000oC)에서 전자파 흡수 거동을 살피기 위해 개발된 초고온 환경 자유공간측정 장비를 활용하여 X-band 대역에서 그 성능을 검증하였다.

Abstract

This paper presents the development of thin and lightweight ultra-high temperature radar-absorbing ceramic composites composed of an aluminosilicate ceramic matrix-based geopolymer reinforced ceramic fiber and sendust magnetic nanoparticles in X-band frequency range (8.2~12.4 GHz). The dielectric properties with regard to complex permittivity of ceramic/sendust-aluminosilicate composites were proportional to the size of sendust magnetic nanoparticle with high magnetic characteristic properties as flake shape and its concentrations in the target frequencyrange. The characteristic microstructures, element composition, phase identification, and thermal stability were examined by SEM, EDS, VSM and TGA, respectively. The fabricated total thicknesses of the proposed single slabultra-high temperature radar absorber correspond to 1.585 mm, respectively, exhibiting their excellent EM absorptionperformance. The behavior of ultra-high temperature EM wave absorption properties was verified to the developedfree-space measurement system linked with high temperature furnace for X-band from 25oC to 1,000oC.

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