한국세라믹학회지 (Journal of the Korean Ceramic Society)

  • 제43권12호
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  • Pages.805-811
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  • 2006
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  • 1229-7801(pISSN)
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  • 2234-0491(eISSN)
한국세라믹학회 (The Korean Ceramic Society)
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Ni의 산화가 고체산화물 연료전지용 Ni/YSZ 연료극의 미세조직과 전해질의 균열에 미치는 영향

Effect of Oxidation of Ni on the Microstructure of Ni/YSZ Anode and Crack Formation in YSZ Electrolyte Layer for SOFC

  • 발행 : 2006.12.31
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초록

The microstructural changes in Ni/YSZ anode substrate and crack formation during Ni oxidation were investigated. The composition of as-sintered anodes was 56 wt% NiO+44 wt% YSZ and that of electrolyte was 8 mol% yttria. After complete reduction, specimens were oxidized in $N_2$ + air at $600\sim800^{\circ}C$. Oxygen partial pressure was controlled in between 0.05 atm and 0.2 atm $O_2$. When the anode was oxidized, at higher than $690^{\circ}C$, three layers were formed in the specimens. The first was fully oxidized layer(NiO/YSZ), the second was a mixed layer and the third, near-intact layer. Under $640^{\circ}C$ such distinctive layers were not observed. Cracks formed at electrolyte layer when weight gain attained at $65\sim75%$ of the total gain due to complete oxidation despite of different oxidation temperature and oxygen partial pressure.

키워드

참고문헌

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피인용 문헌

  1. Evaluation of the Effect of High Temperature on the Interface Characteristics between Solid Oxide Fuel Cell and Ag Paste vol.30, pp.1, 2015, https://doi.org/10.14346/JKOSOS.2015.30.1.021