화학공학소재연구정보센터
Korean Journal of Materials Research, Vol.27, No.3, 155-160, March, 2017
플라즈마 스프레이 (Ca, Co)-Doped LaCrO3 코팅층의 치밀화 및 전기전도도
Densification and Electrical Conductivity of Plasma-Sprayed (Ca, Co)-Doped LaCrO3 Coating
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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.
  1. Zhu WZ, Deevi SC, Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process., 348, 227 (2003)
  2. Fergus JW, Solid State Ion., 171(1-2), 1 (2004)
  3. Horita T, in Perovskite Oxide for Solid Oxide Fuel Cells Springer, ed. Ishihara T, (Springer Science & Business Media, USA, 2009) p. 285.
  4. Jiang SP, Liu L, Khuong POB, Ping WB, Li H, Pu H, J. Power Sources, 176(1), 82 (2008)
  5. Pi SH, Lee SB, Song RH, Lee JW, Lim TH, Park SJ, Shin DR, Park CO, Int. J. Hydrog. Energy, 36(21), 13735 (2011)
  6. Simner SP, Hardy JS, Stevenson JW, J. Electrochem. Soc., 148(4), A351 (2001)
  7. Wang SL, Liu MF, Dong YC, Xie K, Liu XQ, Meng GY, Mater. Res. Bull., 43(10), 2607 (2008)
  8. Ghosh S, Das Sharma A, Basu RN, Maiti HS, J. Am. Ceram. Soc., 90(12), 3741 (2007)
  9. Zhou XL, Ma JJ, Deng FJ, Meng GY, Liu XQ, Solid State Ion., 177(39-40), 3461 (2007)
  10. Okumura K, Aihara Y, Ito S, Kawasaki S, J. Therm. Spray Technol., 9, 354 (2000)
  11. Park CH, Baik KH, Met. Mater. Int., 20, 63 (2014)
  12. Henne RH, Franco T, Ruckdaschel R, J. Therm. Spray Technol., 15, 695 (2006)
  13. Pawlowski L, The Science and Engineering of Thermal Spray Coatings, p.28-50, John Wiley & Sons, New York, USA (1995).
  14. Baik KH, Grant PS, Cantor B, Acta Mater., 52, 199 (2004)
  15. Fauchais P, J. Phys. D-Appl. Phys., 37, R86 (2004)
  16. Li C, Li C, Wang M, Surf. Coat. Technol., 198, 278 (2005)
  17. Ghosh S, Das Sharma A, Basu RN, Maiti HS, Electrochem. Solid State Lett., 9(11), A516 (2006)
  18. Yoon KJ, Stevenson JW, Marina OA, J. Power Sources, 196(20), 8531 (2011)