Preparation of YSZ films on air electrodes by the thermal spray-sintering process
- NGK Insulators, Ltd., Nagoya (Japan)
Yttria-stabilized zirconia (YSZ) is widely used as an electrolyte in solid oxide fuel cells (SOFCs). In SOFC applications, YSZ film requires gas tightness to separate air and fuel gas. Plasma-sprayed YSZ film showed poor gas-tightness due to many cracks. Sintering at 1,550 C improved the gas-tightness of the film, but formed a La{sub 2}Zr{sub 2}O{sub 7} phase at the interface, due to a reaction between the YSZ film and the air electrode. The La{sub 2}Zr{sub 2}O{sub 7} phase increases interfacial resistance causing decreased performance. MnO{sub 2} coating prior to YSZ spraying suppressed La{sub 2}Zr{sub 2}O{sub 7} forming and densified the YSZ film. A sample pre-coated with 1 Mg/cm{sup 2} MnO{sub 2} became gas-tight after sintering at 1,400 C with no La{sub 2}Zr{sub 2}O{sub 7} phase.
- OSTI ID:
- 242470
- Report Number(s):
- CONF-950683-; ISBN 1-56677-095-5; TRN: IM9626%%298
- Resource Relation:
- Conference: 4. international symposium on solid oxide fuel cells, Yokohama (Japan), 18-23 Jun 1995; Other Information: PBD: 1995; Related Information: Is Part Of Proceedings of the fourth international symposium on solid oxide fuel cells (SOFC-IV). Proceedings Volume 95-1; Dokiya, M. [ed.] [National Inst. of Materials and Chemical Research, Tsukuba, Ibaraki (Japan)]; Yamamoto, O. [ed.] [Mie Univ., Tsu, Mie (Japan)]; Tagawa, H. [ed.] [Yokohama National Univ., Yokohama, Kanagawa (Japan)]; Singhal, S.C. [ed.] [Westinghouse Electric Corp., Pittsburgh, PA (United States)]; PB: 1188 p.
- Country of Publication:
- United States
- Language:
- English
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