화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Materials Research, Vol.27, No.3, 155-160, March, 2017
DOI10.3740/MRSK.2017.27.3.155  Export Citation
플라즈마 스프레이 (Ca, Co)-Doped LaCrO3 코팅층의 치밀화 및 전기전도도
Densification and Electrical Conductivity of Plasma-Sprayed (Ca, Co)-Doped LaCrO3 Coating
박희진, 백경호†
  • 충남대학교 신소재공학과
Hee-Jin Park, and Kyeong-Ho Baik†
  • Department of Materials Science and Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
E-mail:
Doped-LaCrO3 perovskites, because of their good electrical conductivity and thermal stability in oxidizing and/or reducing environments, are used in high temperature solid oxide fuel cells as a gas-tight and electrically conductive interconnection layer. In this study, perovskite (La0.8Ca0.2)(Cr0.9Co0.1)O3 (LCCC) coatings manufactured by atmospheric plasma spraying followed by heat treatment at 1200 °C have been investigated in terms of microstructural defects, gas tightness and electrical conductivity. The plasma-sprayed LCCC coating formed an inhomogeneous layered structure after the successive deposition of fully-melted liquid droplets and/or partially-melted droplets. Micro-sized defects including unfilled pores, intersplat pores and micro-cracks in the plasma-sprayed LCCC coating were connected together and allowed substantial amounts gas to pass through the coating. Subsequent heat treatment at 1200 oC formed a homogeneous granule microstructure with a small number of isolated pores, providing a substantial improvement in the gas-tightness of the LCCC coating. The electrical conductivity of the LCCC coating was consequently enhanced due to the complete elimination of inter-splat pores and microcracks, and reached 53 S/cm at 900 °C.
Keywords:LaCrO3 interconnect;plasma spraying;microstructural defects;gas tightness;electrical conductivity
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