A chemomechanical coupling model for stress analysis of oxide scale growing between ceramic coating and substrate

Zhang, Gongxi; Wang, Hailong; Shen, Shengping

doi:10.1007/s00707-017-1887-3

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…The viscoplastic effect of the half‐SOFC system is considered in current research. So the viscoplastic strain rates of anode, electrolyte and oxide layer are given by 9,13,15,16

{\dot{ε}}_{Ni}^{vis} = J_{Ni} σ_{Ni}

{\dot{ε}}_{YSZ}^{vis} = J_{YSZ} σ_{YSZ}

{\dot{ε}}_{NiO}^{vis} = J_{NiO} σ_{NiO}

where J Ni , J YSZ and J NiO are the viscoplastic coefficients of anode, electrolyte, and oxide layer (unit: Pa −1 s −1 ), respectively.…”

Section: Chemo‐mechanical Coupling Modelmentioning

confidence: 99%

“…The mechanical state was characterized by transverse strain rate and the chemical reaction rate was represented by thickness growth rate. By considering the elastic strain of the system and growth strain of the oxide layer, a diffusion and stress coupling model was established by Dong et al 6 A chemo‐mechanical coupling model under the different influence factors was also studied by considering the elastic strain and growth strain of the ceramic coating/oxide layer/metal system 9 . These investigations provided the connection for the study of chemical and mechanical behavior during the metal oxidation process and established the theoretical basis and calculation method for the establishment of a chemo‐mechanical coupling model.…”

Section: Introductionmentioning

confidence: 99%

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Chemo‐mechanical coupling model of solid oxide fuel cell under high‐temperature oxidation

2020

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Summary Solid oxide fuel cell (SOFC), which is a generation device that converts chemical energy into electrical energy, has been regarded as a new generation device. The diffusion mechanism of metal cations and anions during the high‐temperature oxidation process of SOFC is proposed. Based on the equilibrium expression and diffusion equation, the chemo‐mechanical coupling relationship between oxide stress and thickness growth of the oxide layer is established by considering the influences of viscoplastic effect and oxide growth effect. The present theoretical result is consistent with the previous experimental results. In addition, the stress critical points corresponding to different parameters are different in initial oxidation stage. The oxide stress varies dramatically with time in the compressive stress phase, but it changes slowly in the tensile stress phase. The compressive stress that exists in the oxide layer increases with the growth coefficient (DNiO = 1000‐15 000 m−1) of the oxide layer. The oxide stresses in oxide layer and electrolyte reduce with viscoplastic coefficient of the oxide layer from JNiO = 8.97 × 10−5 Pa−1 s−1 to JNiO = 16.97 × 10−5 Pa−1 s−1 and anode‐oxide layer thicknesses from H = 30 μm to H = 660 μm, while they increase with viscoplastic coefficient of the anode from JNi = 3.81 × 10−5 Pa−1 s−1 to JNi = 12.81 × 10−5 Pa−1 s−1 and kinetic parabolic constant from k p = 2.9 × 10−15 m2s−1 to k p = 12.9 × 10−15 m2s−1 in whole oxidation stage. The oxide thickness increases with kinetic parabolic constant in the whole oxidation stage and this changing trend accords with parabolic diffusion law. The oxide thickness increases with temperatures increasing. The results obtained from this study will provide the reference to the researches of the chemo‐mechanical coupling model and performance optimization of SOFC under high‐temperature oxidation.

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“…The viscoplastic effect of the half‐SOFC system is considered in current research. So the viscoplastic strain rates of anode, electrolyte and oxide layer are given by 9,13,15,16