Evaluation of the Thermomechanical Behavior of Metallic Interconnectors Coated with a Film of La_0,8Ca_0,2CrO₃ of Solid Oxide Fuel Cells (SOFC)

Abstract:

Doped lanthanum chromite has been the most common material used as interconnectors in solid oxide (SOFC) fuel cell, allowing for the stacking of the SOFC. Reducing the operating temperature, to around 800°C, the cells of solid oxide fuel have made the use of metal interconnectors possible as an alternative to ceramic LaCrO₃. From the practical point of view for the material to be a strong candidate as an interconnector, it must have good physical and mechanical properties, such as resistance to oxidizing environments and reducers, facility to manufacture, and adequate thermomechanical properties. In this work, a study was conducted on the thermomechanical properties of metallic interconnectors (AISI 444) covered with La_0,8Ca_0,2CrO₃ by way of deposition technique for pyrolysis spray for the intermediate temperature (IT-SOFC) fuel cell. The material was characterized by X-ray diffraction (XRD), oxidative test, flexural strength at room temperature and at 900°C, and scanning electron microscopy (SEM). The evaluation of the phases formed on metallic interconnectors coated with La_0,8Ca_0,2CrO₃ on both the deposition and after oxidative assay was performed by XRD. The oxidative behavior showed increased resistance to oxidation of the metal substrate covered by La_0,8Ca_0,2CrO₃. In the flexural strength of the coated metal substrate, it was noted only in the increasing temperature. With the aid of SEM, the formation of layers of Cr₂O₃ and (Cr, Mn)₃O₄ on the metallic substrate was seen, and confirmed stability of La_0,8Ca_0,2CrO₃ ceramic film after oxidative test.

• Periodical: Materials Science Forum (Volume 820)
• Pages: 244-249
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.820.244
• Online since: June 2015
• Authors: Cláwsio Rogério Cruz de Sousa, Wilson Acchar, Herval Ramos Paes, José Flávio Timoteo
• Keywords: AISI 444 Lanthanum Chromite, Metallic Interconnectors, SOFC, Thermomechanical

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