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http://dx.doi.org/10.4191/KCERS.2005.42.12.842

High Temperature Gas Leak Behavior of Glass-Ceramic Fiber Composite Seals for SOFC Applications  

Lee, Jae-Chun (Department of Materials Science and Engineering, Myongji University)
Kwon, Hyuk-Chon (Department of Materials Science and Engineering, Myongji University)
Kwon, Young-Pil (Department of Materials Science and Engineering, Myongji University)
Park, Sung (Department of Materials Science and Engineering, Myongji University)
Jang, Jin-Sik (Byucksan Corp)
Lee, Jongho (Nano-Materials Research Center, Korea Institute of Science and Technology)
Kim, Joosun (Nano-Materials Research Center, Korea Institute of Science and Technology)
Lee, Hae-Won (Nano-Materials Research Center, Korea Institute of Science and Technology)
Publication Information
Journal of the Korean Ceramic Society / v.42, no.12, 2005 , pp. 842-845 More about this Journal
Abstract
Glass composites containing ceramic fiber have been developed for Solid Oxide Fuel Cell (SOFC) seals. Effect of glass type, loading pressure and thermal cycle the leak rates of composite seals was investigated. Seal performance of two commercial glasses was compared with that of $SiO_2BaO-B_2O_3$ glass synthesized in this work. The leak rate for seals made of pyrex(R) increases from $\~0.0005\;to\;\~0.004sccm/cm$ as the gas pressure increases from 10 to 50 kPa. The soda lime silicate glass seal shows the leak rate two times higher than the one made of pyrex(R) or $SiO_2BaO-B_2O_3$ glass. The viscosity of glass at the seal test temperature is presumed to affect the leak rate of the glass seal. As the applied loading pressure increases from 0.4 to 0.8 MPa at $750^{\circ}C$, the leak rate decreases from 0.038 to 0.024 sccm/cm for composite seals. It has been found that during 50 thermal cycles between $450^{\circ}C\;to\;700^{\circ}C$ leak rates remained almost constant, ranging from 0.025 to 0.03sccm/cm. The results showed an excellent thermal cycle stability as well as sealability of the glass matrix ceramic fiber composite seals.
Keywords
Ceramic fiber; Glass; Seal; Leak rate; Solid oxide fuel cell;
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