Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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The Effects of a Filler with a High Coefficient of Thermal Expansion on a Sealant for High-Temperature (750 ~ 850℃) SOFCs

고온 (750 ~ 850℃) SOFC용 밀봉재의 특성에 미치는 고열팽창계수를 갖는 필러의 영향

  • Kim, Bit Nam (Optic&Display Material Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Lee, Mi Jai (Optic&Display Material Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Hwang, Jong Hee (Optic&Display Material Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Lim, Tae Young (Optic&Display Material Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Jin Ho (Optic&Display Material Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Hwang, Hae Jin (School of Material Science and Engineering, Inha University) ;
  • Kim, Il Won (CERA Co. Ltd.) ;
  • Chung, Woon Jin (Division of Advanced Materials Engineering, Kongju National University)
  • 김빛남 (한국세라믹기술원 광디스플레이소재팀) ;
  • 이미재 (한국세라믹기술원 광디스플레이소재팀) ;
  • 황종희 (한국세라믹기술원 광디스플레이소재팀) ;
  • 임태영 (한국세라믹기술원 광디스플레이소재팀) ;
  • 김진호 (한국세라믹기술원 광디스플레이소재팀) ;
  • 황해진 (인하대학교 신소재공학부) ;
  • 김일원 (세라) ;
  • 정운진 (공주대학교 신소재공학부)
  • Received : 2013.10.06
  • Accepted : 2013.11.21
  • Published : 2013.11.30
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Abstract

In this study, we report that effects of a filler with a high coefficient of thermal expansion on a sealant for high-temperature ($750{\sim}850^{\circ}C$) SOFC. We designed a $SiO_2-BaO-ZnO-B_2O_3-Al_2O_3$ glass system with a softening temperature higher than $750^{\circ}C$. The properties of the glass system show not only low volumetric shrinking but also low swelling. The glass system did not create a crystal phase during along-term heat treatment. We fabricated a seal gasket with 0, 10, 15, and 20 wt% cristobalite added as filler materials with glass powder. The coefficient of thermal expansion of the seal gasket increased according to cristobalite content. During along-term heat treatment, the leak rate decreased by about 5% after a heat treatment in an oxidizing atmosphere at $750^{\circ}C$ for 2000 h, also decreasing by about 6% after a heat treatment in a reducing atmosphere at $750^{\circ}C$ for 1000 h.

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References

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