고체산화물 연료전지용 (Ca, Sr) 도핑된 LaCrO3계 세라믹 연결재 코팅층의 특성 연구
Characteristics of (Ca, Sr)-doped LaCrO3 Coating Layer for Ceramic Interconnect of Solid Oxide Fuel Cell
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본 연구는 Pechini법을 이용하여 Ca과 Sr이 도핑된 LaCrO3계의 La0.6Ca0.41CrO3 (LCC41), La0.8Sr0.05Ca0.15CrO3 (LSCC), La0.75Ca0.27CrO3 (LCC27) 분말들을 제조하여, 분말의 소결 특성 및 코팅층의 특성을 조사하였다. 제조된 LCC41, LSCC, LCC27 분말은 각각 0.6, 0.9, 1.5 ㎛의 평균 입자크기를 가졌으며, LCC41의 경우 1400 ℃에서 98% 이상의 소결 밀도를 나타내었다. 연료극 지지체상에 LSCC 코팅은 LCC41층에 있는 Ca의 이동을 어느 정도 억제하는 역할을 하는 것으로 나타났다. 대기 용사 코팅된 LCC27은 치밀한 코팅막을 형성하였으며, 이 코팅층 위에 LCC41을 습식 코팅할 경우 더욱 치밀하고 높은 전기전도도를 갖는 코팅막을 얻을 수 있었다. 용사코팅된 LCC27, 습식 코팅된 LCC41는 높은 전기전도도를 나타내었으나, LSCC의 경우 낮은 소결성으로 인해 전기전도도가 작게 나타났다.
Abstract
Using Pechini method, we synthesized the La0.6Ca0.41CrO3 (LCC41) and La0.8Sr0.05Ca0.15CrO3 (LSCC) powders for slurry dip coating, and La0.75Ca0.27CrO3 (LCC27) powder for air plasma spray coating. The sintering property of the powders and their coating properties were investigated. The average particle sizes of the LCC41, LSCC, LCC27 were 0.6, 0.9, 1.5 ㎛, respectively. The relative density of LCC41 bulk was to be found about 98%. The LSCC coating on anode support prevented Ca migration of the coated LCC41 on the anode some or less, which was confirmed from EDS result. The air plasma spray-coated LCC27 with the dip-coated LCC41 were more dense and showed better electrical conductivity than those of the air plasma spray-coated LCC27 and the dip-coated LSCC and LSCC41. The LCC41 and LCC27 showed good electrical conductivities, but the LSCC had a poor electrical conductivity probably due to low sinterability
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