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J. Korean Ceram. Soc. > Volume 35(6); 1998 > Article
Journal of the Korean Ceramic Society 1998;35(6): 610.
알루미나 첨가가 플라즈마 용사된 세리아계 전해질체 코팅츠의 미세구조 및 기계적 특성에 미치는 영향
김장엽, 유석원, 임대순
고려대학교 재료공학과
The Effect of Alumina Addition on Microstructure and Mechanical Properties of Plasma-Sparayed Ceria Based Electrolyte Coatings
Alumina were added to ceria based ceramic powders upto 9.7 vol% and composite powders were sprayed by plasma spraying process in order to improve the mechanical properties such as hardness fracture tough-ness and thermal shock resistance. The ceria based coating sprayed without alumina has the typical colum-nar and lamellar structure. Alumina addition has lowered the amount of columnar and lamellar sturcture Added alumina was segreagated in the grain boundary and grain of ceria based crystal accompanied with pore. The maximum value of density and the minimum value of porosity were observed at the sprayed coating with 4.8 vol% alumina. The hardness fracture toughness and thermal shock resistance were increased with alumina addition. The improvement of mechanical properties of plasma sparyed ceria based coatings result-ed from the disapperance of the columnar and lamellar sturcture by addition of alumina.
Key words: Plasma spraying process, Ceria based coatings, Sol-gel process, Fuel cell, Electrolyte, Sealing
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