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Thermal expansion, porosity, and microhardness properties of solid oxide fuel cell metallic interconnects manufactured by powder metallurgy approach

Alparslan Topcu, Ömer Faruk Yalçın, Bülent Öztürk, Ömer Necati Cora


The effects of manufacturing parameters on the physical, thermal and mechanical properties of solid oxide fuel cell (SOFC) metallic interconnects manufactured through the powder metallurgy (P/M) method were investigated. To this goal, interconnect samples were first fabricated through the P/M technique using Nickel, Stainless steel 316L, Inconel 600, SUS 445J1, 1C44Mo20, and Crofer®22 APU powders. Varied manufacturing parameters (compaction pressure, compaction temperature, and sintering temperature) were adopted to obtain sound samples. For characterization purposes, porosity, microhardness, and coefficient of thermal expansion (CTE) measurements were performed on the samples. Results showed that the porosity and CTE values of samples decreased with the increasing compaction pressure and temperature as well as sintering temperature while microhardness values increased. It was concluded that only the Crofer®22 APU powders satisfied the coefficient of thermal expansion requirement for SOFCs suggested in the literature.

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