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Communication Dans Un Congrès Année : 2013

Oxidation at high temperature of zirconia matrix composite dispersed with stainless steel particles

Résumé

Materials with non uniform properties are being developed to optimize several functions of industrial components in severe atmospheres at high temperature. Composites called M(p)-CMC(s): "ceramic matrix composites dispersed with metal particles" are candidates for high-temperature structure materials as functionally graded materials (FGMs). Recent studies highlight the use of graded M(p)-CMC(s) materials as intermediate components between interconnectors and electrolyte in the oxide fuel cell SOFC [1, 2]. The model M(p)-CMC(s) described in this study is based on yttrium stabilized ZrO2 and 304L stainless steel materials. The oxidation behavior of the model 304L(p)-ZrO2(s) composite produced by powder metallurgy, studied by means of thermogravimetry (TGA) under 20 % O2 in helium at 800 °C, is presented. The composite oxidation behavior is not the usual stainless steel parabolic ones. A fast initial increase in mass gain followed by a slow one indicates that the yttrium doped zirconia matrix allows the diffusion of oxygen species as expected with its high ionic conductivity at 800°C. SEM, XRD analysis and Auger spectroscopy of the oxidized composite were used to characterize the oxide scale. The metallic particles are surrounded by an outward complex Cr and Fe rich oxide layer whereas Cr2O3 nodules nucleate and develop inward. The layer thickness appears to be irregular. Many cracks connected to the oxidized stainless steel particles can be observed in the zirconia matrixprobably due due to stresses induced by the volume expansion of the oxide layer. Sudden changes in oxygen partial pressure during experiments reveal an accelerating effect of the oxygen pressure, contrarily to the 304L oxidation. An oxidation mechanism is proposed based on these results and observations. [1] Li J Q, Zeng X R, Tang J N, Xiao P, Journal of the European Ceramic Society, 2003, p 23, 1847-1853. [2] Gillia O, Caillens B, Powder Technology 2011, 208, p 355-366
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Dates et versions

hal-00849847 , version 1 (01-08-2013)

Identifiants

  • HAL Id : hal-00849847 , version 1

Citer

Véronique Peres, Jinane Tarabay, Michèle Pijolat. Oxidation at high temperature of zirconia matrix composite dispersed with stainless steel particles. Materials for Energy 2013, session Materials for extreme environments, May 2013, Karlsruhe, Germany. ⟨hal-00849847⟩
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