Investigation into the Cu addition effect in the 23Cr ferritic stainless steel for SOFC interconnect

Title
Investigation into the Cu addition effect in the 23Cr ferritic stainless steel for SOFC interconnect
Authors
김병규김동익심재혁정우상이경우권숙인
Keywords
SOFC; Interconnect; Cu; strength; Area Specific Resistance
Issue Date
2012-08
Publisher
IUMRS-ICA 2012
Abstract
Metallic interconnects draw attention as new candidates substituted for conventional ceramic interconnects in solid oxide fuel cells (SOFCs) as recent researches have enables SOFC operating temperature to be lowered to a range from 600°C to 800°C. Since the operation of SOFCs takes place at high temperatures, greater than 600°C, the oxidation resistance, electrical conductivity, and mechanical stability of metallic interconnectors needs to be secured for optimized interconnect performances under such extreme operating condition. This research is aimed to study the effect of Cu addition in the 23 Cr ferritic stainless steel on various properties at 700°C and 800°C. The Cu added steel exhibits enhanced tensile strength and low cycle fatigue strength at operating temperatures, owing to concurrent strengthening effect of Cu precipitates and solid solution. Cu addition also contributes to improvement in oxidation resistance and reduction in area specific resistance at 800°C by forming Cu rich spinel chromia, CuCr2O4, which has the higher electrical conductivity than (Mn, Cr)3O4. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDXS) analysis was employed to analyze the oxide scale composed on the samples.
URI
http://pubs.kist.re.kr/handle/201004/44079
Appears in Collections:
KIST Publication > Conference Paper
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