Abstract:
The SUS430-Sr
2Fe
1.5Mo
0.5O
6−δ (SUS430-SFM) stainless steel-ceramic composite connector materials for solid oxide fuel cell (SOFC) were prepared by a compaction-sintering-coating method, using SUS430 stainless powders and Sr
2Fe
1.5Mo
0.5O
6−δ (SFM) ceramic powders as the raw materials. Microstructure, oxidation resistance, and electrical conductivity of the sintered SUS430 and SUS430-SFM samples were characterized. The results show that the SFM coating and the SUS430 substrate show a matching thermal expansion coefficient (TEC), and there is a good combination between the coating and the substrate. The oxidation rate constant of the SUS430-SFM sample is about 3.66×10
−14 g
2∙cm
−4∙s
−1 after oxidation at 800 ℃ for 140 h in air, which is about 50% lower than that of the SUS430 sample (2.42×10
−14 g
2∙cm
−4∙s
−1). The area specific resistance (ASR) of the SUS430-SFM sample also reduces from 81 mΩ∙cm
2 (SUS430 sample) to 2.6 mΩ∙cm
2. The present work indicates that the SFM coating can effectively improve the oxidation resistance and the electrical conductivity of the SUS430 stainless substrate.