A microstructure based numerical simulation of microwave sintering of specialized SOFC materials

Darcovich, K.; Whitfield, Pamela S.; Amow, G.; Shinagawa, Kazunari; Miyahara, Ricardo Yoshimitsu

doi:10.1016/j.jeurceramsoc.2005.03.038

Cited by 15 publications

(8 citation statements)

References 28 publications

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“…Microwave heating, on the other hand, is generated by the molecular or ionic interactions with electromagnetic field via conversions of electromagnetic energy into the thermal energy [27,43]. The above theory, confirms the contribution of volumetric heating on microwave sintering according to which the ions of the whole body of the material undergo the interaction with the electromagnetic field [44,45]. The heat is, thus, produced in the whole bulk of the material at the same time and the activation of densification mechanisms are in need of much shorter times.…”

Section: Resultssupporting

confidence: 54%

Processing of nanocrystalline 8mol% yttria-stabilized zirconia by conventional, microwave-assisted and two-step sintering

Mazaheri

Zahedi

Hejazi

2008

Materials Science and Engineering: A

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Section: Resultssupporting

confidence: 54%

Processing of nanocrystalline 8mol% yttria-stabilized zirconia by conventional, microwave-assisted and two-step sintering

Mazaheri

Zahedi

Hejazi

2008

Materials Science and Engineering: A

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“…This result is trivial because neither the differences in temperature distribution and/or evolution nor microwave nonthermal effects have been taken into account in this comparison. A simulation of microwave sintering of solid oxide fuel cell materials 177 utilizes a continuum sintering model with some empirical parameters and takes into account the evolution of powder particles size distribution. The electromagnetic field is assumed to be decaying exponentially from the surface into the bulk of the material.…”

Section: April 2013mentioning

confidence: 99%

Microwave Sintering: Fundamentals and Modeling

2013

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This paper reviews the basic physical notions underlying microwave sintering and the theoretical and numerical models of the microwave sintering process. The propagation and absorption of electromagnetic waves in materials, and the distribution of electromagnetic field in cavity resonators that serve as applicators for microwave processing are discussed and the electromagnetic modeling of such applicators is reviewed. The microwave absorption properties of ceramic and metal powder materials and the methods of their description are addressed. Self‐consistent electromagnetic and thermal models that are capable of predicting the temperature distribution in the microwave‐heated materials and dynamic effects such as thermal runaway instabilities are reviewed. The multiphysics simulations that combine electromagnetic, thermal, and sintering models and result in predicting densification, shrinkage, and grain structure evolution are discussed in detail. The significance of microwave nonthermal effects in sintering is demonstrated based on the experimental results, and the models of such effects are reviewed.

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“…The relatively open structural framework afforded by the rock-salt intergrowth allowing the accommodation of hyperstoichiometric oxide-ions in the rock-salt layer as interstitials. [1][2]7,9,12 However, due to insufficient electrical conductivity in La 2 NiO 4+δ , 10-70 S/cm 8 , attempts to improve such properties which have been conducted through substitution of the A site with alkaline-earth ions. La 2 NiO 4+δ and related materials exhibiting Ruddlesden-Popper structure have been proposed as candidates for energy related electrochemical applications because of their excellent transport and electrocatalytic properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sr substituted La_2−xSr_xNiO_4+δ (x = 0, 0.2, 0.4, 0.6, and 0.8) on oxygen stoichiometry and oxygen transport properties

et al. 2015

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Effects of Sr substitution in La 2−x Sr x NiO 4+δ (x = 0.2, 0.4, 0.6, and 0.8) on the oxygen stoichiometry, phase and transport properties were studied. Mixed effects between reduction of oxygen excess and increasing valence of Ni were found as charge compensation mechanisms. Highest oxygen diffusivity found at the minimum Sr substitution x=0.2 with an unusual increase observed when the x = 0.8. ARTICLE This journal isStoichiometry and oxygen diffusion properties of La 2−x Sr x NiO 4±δ with x = 0.2, 0.4, 0.6, and 0.8 prepared via a sol-gel method were investigated in this study. Iodometric titration and thermogravimetric analysis were used to determine the oxygen non-stoichiometry. Over the entire compositional range, the samples exhibit oxygen hyperstoichiometry with the minimum value δ = 0.14 at x = 0.4. Mixed effects between reduction of oxygen excess and increasing valence of Ni were found as charge compensation mechanisms; the former dominated at a low level of substitution, x < 0.4, while the latter dominated at higher levels of Sr (0.4 < x < 0.8). The highest oxygen diffusion coefficient was found for the minimum amount of Sr substitution, x = 0.2, continuously decreasing with x until x = 0.6. An unusual increase in D* was observed when the Sr content increased up to x = 0.8.

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A microstructure based numerical simulation of microwave sintering of specialized SOFC materials

Cited by 15 publications

References 28 publications

Processing of nanocrystalline 8mol% yttria-stabilized zirconia by conventional, microwave-assisted and two-step sintering

Processing of nanocrystalline 8mol% yttria-stabilized zirconia by conventional, microwave-assisted and two-step sintering

Microwave Sintering: Fundamentals and Modeling

Effect of Sr substituted La_2−xSr_xNiO_4+δ (x = 0, 0.2, 0.4, 0.6, and 0.8) on oxygen stoichiometry and oxygen transport properties

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A microstructure based numerical simulation of microwave sintering of specialized SOFC materials

Cited by 15 publications

References 28 publications

Processing of nanocrystalline 8mol% yttria-stabilized zirconia by conventional, microwave-assisted and two-step sintering

Processing of nanocrystalline 8mol% yttria-stabilized zirconia by conventional, microwave-assisted and two-step sintering

Microwave Sintering: Fundamentals and Modeling

Effect of Sr substituted La2−xSrxNiO4+δ (x = 0, 0.2, 0.4, 0.6, and 0.8) on oxygen stoichiometry and oxygen transport properties

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Effect of Sr substituted La_2−xSr_xNiO_4+δ (x = 0, 0.2, 0.4, 0.6, and 0.8) on oxygen stoichiometry and oxygen transport properties