Scale Formation of SOFC Metallic Interconnects in Coal Syngas
Planar solid oxide fuel cells (SOFCs) which can use coal syngas as the fuel and stainless steels in their construction have attracted considerable interesting, due to the high power densities and cost-effective manufacturing. However, the components of SOFCs work under a long-term, high temperature corrosive atmosphere, which places a lot of stringent requirements on the materials of the components. For interconnects, since they are simultaneously exposed to air on the cathode side and to fuel on the anode side, the materials must have good oxidation resistance, as well as other electric and mechanical properties. Although extensive research have been done to examine the oxidation behaviors of many potential interconnect materials in air, hydrogen and dual-atmosphere, little oxidation information of these materials in a coal syngas environment are available. Because the oxidation properties of materials in different media are quite different, evaluating the oxidation behavior of these potential interconnect materials in coal syngas is available.
In the present work, the oxidation properties of Fe-based ferritic alloys Crofer 22 APU, E-Brite, AISI 430 and a Ni-based alloy Haynes 230 isothermally exposed in coal syngas at 800 oC for 100 hours and 500 hours were studied. Moreover, the effects of pre-oxidized coating and cladding on the oxidation properties of the materials in coal syngas at high temperatures were investigated and both of them could significantly improve the oxidation resistance.
Advisor:Scott X. Mao; Kevin P. Chen; Sung Kwon Cho
School:University of Pittsburgh
School Location:USA - Pennsylvania
Source Type:Master's Thesis
Date of Publication:01/30/2008