• Proceedings of the KIEE Conference
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• 1997.07d
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• pp.1258-1260
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• 1997

The metallic interconnector has a superior property than the ceramic interconnector in the point of the cell performance, but has problems to form oxide films on the interconnector surface during cell operation and induce cracking in the cell due to the stress by the thermal expansion coefficient difference with stabilized Zr electrolyte. For solving the problems in the metallic interconnector, new and modified materials have been investigated. In this paper, $LaCrO_3$ dispersed Cr was evaluated in high temperature oxidized characteristics, sintering density, electrical conductivity and various thermochemical properties. The test results show that $LaCrO_3$ dispersed Cr has more superior properties than that of conventional alloy interconnector and $LaCrO_3$ dispersed Cr can be used as an interconnector in SOFC.

• Journal of the Microelectronics and Packaging Society
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• v.25 no.4
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• pp.25-34
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• 2018

In this paper, we review the latest technical progress and commercialization of stretchable interconnectors, stretchable strain sensors, and stretchable substrates for stretchable electronics. The development of stretchable electronics can pave a way for new applications such as wearable devices, bio-integrated devices, healthcare and monitoring, and soft robotics. The essential components of stretchable electronic devices are stretchable interconnector and stretchable substrate. Stretchable interconnector should have high stretchability and high electrical conductivity as well as stability under severe mechanical deformation. Therefore several nanocomposite-based materials using CNT, graphene, nanowire, and metal flake have been developed. Geometric engineering such as wavy, serpentine, buckled and mesh structure has been well developed. Stretchable substrate should also pose high stretchability and compatibility with stretchable sensing or interconnecting material. We summarize the recent research results of new materials for stretchable interconnector and substrate as well as strain sensors. The Important challenges in development of the stretchable interconnector and substrate are also briefly discussed.

• Journal of the Korean Ceramic Society
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• v.37 no.9
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• pp.887-893
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• 2000

중온형 고체산화물 연료전지용 금속접속자로서의 적용가능성을 알아보기 위하여 내산화막을 코팅한 Ferritic 스틸의 산화특성을 연구하였다. Ferritic 스틸은 고온산화로 형성된 산화크롬, 산화철막에 의해 시간에 따라 저항이 크게 증가함을 보였다. 반면, LMO 코팅한 Ferritic 스틸은 Ducrolloy와 같이 고온저항이 주기적인 증감을 보이면서 증가하지만 내산화막의 형성에 의해 80시간 이후에는 저항증가가 없어 정기 산화안정성을 보였다.

• Ceramist
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• v.3 no.5
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• pp.116-124
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• 2000

• The Transactions of the Korean Institute of Electrical Engineers C
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• v.48 no.8
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• pp.570-576
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• 1999

$LaCrO_3$-dispersed Cr alloys for metallic interconnector of solid oxide fuel cell have been studied as function of $LaCrO_3$ content in the range of 5 to 25 vol.% in order to examine the electric conductivity, the oxidation property and the thermal expansion behavior of these alloys. The $LaCrO_3$-dispersed Cr alloys showed high electrical conductivities of $3~5\times10^4$ S/cm at room temperature, and as the $LaCrO_3$content increased the conductivity decreased slightly. During the cyclic oxidation test at $1100^{\circ}C$, the weight change of the Cr alloys decreased with increasing number of oxidation cycle except first cycle, which is attributed to the vaporization of the oxide scale. More addition of the $LaCrO_3$ content reduced also the weight change of the Cr alloys. These mean that the oxide scale formed at the surface of the Cr alloy becomes stable with increasing number of oxidation cycle and$LaCrO_3$ content. The measured thermal expansion of the Cr alloy was well fitted to that of 8 mol% $Y_2O_3$-stabilized $ZrO_2$ electrolyte. These results demonstrate that $LaCrO_3$-dispersed Cr alloy is a useful material for metallic interconnector of solid oxide fuel cell.

• Transactions of the Korean hydrogen and new energy society
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• v.29 no.3
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• pp.274-279
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• 2018

Sc-substituted $La_{0.6}Sr_{0.4}FeO_{3-{\delta}}$(LSFSc) has synthesized for ceramic interconnector of tubular solid oxide cells (SOCs). For improving the redox stability and electric conductivity of LSFSc, the compositions of Sc, pH value of mixed precursors, calcination temperature and times were optimizing. The electrochemical performances of $La_{0.6}Sr_{0.4}Fe_{1-x}Sc_xO_{3-{\delta}}$ powders were measured as depending on Sc composition. The electric conductivity and redox stability of $La_{0.6}Sr_{0.4}Fe_{1-x}Sc_xO_{3-{\delta}}$ was determined by Sc concentration. $La_{0.6}Sr_{0.4}Fe_{0.9}Sc_{0.1}O_{3-{\delta}}$ powders can be one of the stable composition for ceramic interconnector of tubular-SOCs.

• 한국신재생에너지학회:학술대회논문집
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• 2010.06a
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• pp.128.1-128.1
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• 2010

본 연구는 세라믹 연결재로 사용되는 Perovskite 구조의 LYSMO조성의 실제 SOFC stack적용을 위한 소결온도 제어방법에 관해 연구하였다. SOFC 단전지에서 IC소재는 $1300{\sim}{\cdot}1400^{\circ}C$의 온도에서 소결이 이루어져만 하나 현재 연구발표된 IC는 대부분이 $1500^{\circ}C$ 이상에서 소결이 되므로 실제 stack적용에 문제가 있다. 이러한 문제를 해결하기위해 IC소재에 소결조제를 첨가하여 소결온도를 제어코자 하였다. 실험결과 $MgB_6$와 $LaB_6$등의 불화물계의 첨가가 세라믹 연결재의 소결온도 감소에 효과적인 것으로 나타났다. 소결조제의 첨가는 소결온도의 감소를 이끌었지만 열팽창 계수에는 큰 영향을 끼치지는 않았다. 하지만 전기적 특성은 큰 폭으로 감소하여 전기전도도 개선을 위한 다른 방안이 필요함을 확인할 수 있었다.

• Proceedings of the Korean Ceranic Society Conference
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• 2004.10a
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• pp.98.1-98.1
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• 2004

• Proceedings of the Korean Ceranic Society Conference
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• 2002.10a
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• pp.103.2-103
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• 2002

• Journal of the Korean Ceramic Society
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• v.40 no.2
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• pp.139-145
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• 2003

We studied oxidation behaviors of anti-oxidative Y-Cr oxide coated sol on ferritic steel for application of the Fe-Cr alloys as interconnectors of planar-type Solid Oxide Fuel Cells(SOFCs). In coated$YCrO_3$on the ferritic steel, the phases of $YCrO_3$,$Cr_2O_3$and $Mn_{1.5}Cr_{1.5}O_4$on the coated surface were detected, but iron base scales were not observed after oxidation at 80$0^{\circ}C$ for 40 h. The Mn-Cr oxide scales were grown with oxidation by diffusing components in the ferritic steel from inner. The Log(ASR/T) value that expresses electrical resistance of coated$YCrO_3$on the ferritic steel was -4.57~$-4.70{omega}cm^2K^{-1}$, lower in comparison with the one of the uncoated ferritic steel,$-3.99{omega}cm^2K^{-1}$. This indicates the applicability of Fe-l6Cr alloy as interconnector materials for SOFCs.