화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of the Korean Industrial and Engineering Chemistry, Vol.14, No.6, 698-706, October, 2003
Export Citation
건식-복사 열분해에 의한 이산화망간 적용 탄탈륨콘덴서의 특성 연구
A Study on the Characteristics of Tantalum Condenser Applying the Manganese dioxide Pyrolyzed in a Dry-Radiational furnace
김재근†, 유형진1, 황규연1, 김경호1
  • 파츠닉(주) 연구소, 경기 435-030
  • 1중앙대학교 화학공학과, 서울 156-756
Jaekeu Kim†, Hyungjin Yu1, Kyuyeun Hwang1, and Kyoungho Kim1
  • R&D Center, Partsnic, Kyonggi-Do 435-030, Korea
  • 1Department of Chemical Engineering, Chung-Ang University, Seoul 156-756, Korea
E-mail:
초록
질산망간 수용액의 건식-복사 열분해에 관한 연구를 수행하였다. 원재료인 질산망간의 TG/DSC 분석을 통해 200 ~ 300 ℃의 복사 열분해 온도범위를 설정하였다. 건식-복사 열분해에 의해 탄탈륨 콘덴서를 제작한 결과 240 ℃에서 가장 우수한 콘덴서 특성을 기록하였다. 240 ℃에서 열분해된 이산화망간의 XRD 분석 결과 β-MnO2가 주생성물임을 확인되었다. 전해질 층 특성에 대한 질산망간 농도의 영향을 분석한 결과 10 ~ 40 wt% 농도는 탄탈륨 소자 pore 내부 전해질 층 특성에 기여하고, 50 wt% 이상은 외부 전해질 층 특성에 영향을 끼치며, 60 wt% 이상은 건식-복사 열분해 방식에 적합하지 않은 것이 확인되었다. 또한 40 wt% 이상에서는 생성된 이산화망간 층의 morphology가 각형 구조를 취함으로써 계면저항을 증가시키는 것이 확인되었다. 질산망간 농도 및 열분해 횟수에 따른 콘덴서 특성을 평가한 결과 30 wt%의 농도에서 6회 이상 열분해를 반복한 경우 높은 정전용량, 낮은 유전손실 그리고 100~106 Hz 범위에서 월등한 임피던스 특성을 발휘하였다.
A study on the dry-radiational pyrolysis of an aqueous solution of manganese intrate has been carried out. The pyrolysis temperature of the manganese nitrate ranged from 200 to 300 ℃ in TG/DSC analysis. When the manganese nitrate was pyrolytically decomposed at 240 ℃, the best condenser properties were obtained, and the main product after pyrolysis of the manganese nitrate at that temperature was identified as β-MnO2 by XRD analysis. Studies on the influence of the manganese nitrate concentration on the overall characteristics of condenser showed that the concentration of the manganese nitrate solution from 10 to 40 wt% contributed to the characteristics of manganese dioxide layer formed in the inner part of the sintered tantalum body; the concentration over 50 wt% worked for those of the outer part; and the concentration over 60 wt% was found to be not proper in this dry type pyrolysis. The morphology of the manganese dioxide layer formed from 40 wt% or higher concentration was square-like, which resulted in the increase of interfacial resistance. From the evaluation of the properties of the tantalum concenser pyrolyzed in the dry-radiational furnace as functions of concentration of the manganese nitrate solution and pyrolysis cycle, it was found that pyrolyzing more than 6 cycles at 30 wt% manganese nitrate solution produced tantalum condenser with high capacitances, low dissipation factors and excellent impedance characteristics over the scanned frequency ranges from 100 to 106 Hz.
Keywords:dry-radiational pyrolysis;manganese nitrate;tantalum condenser;manganese dioxide
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