Aging of reticulated Si-SiC foams in porous burners

Ortona, Alberto; Pusterla, Simone; Fino, Paolo; Mach, F. V.; Delgado, Antonio; Biamino, Sara

doi:10.1179/174367510x12663198542586

Cited by 51 publications

(28 citation statements)

References 15 publications

(25 reference statements)

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“…One strut was extracted from each porous architecture and pulverized for the XRD tests. As a result the signal from the oxide phases is quite low, nevertheless we detected the same phases shown in the literature [6,7,17]. Due to silicon alloy formation and loss, peripheral strut rupture during the thermal treatment in the porous burner of the most delicate structures, the recorded mass change data were not reliable and thus not reported in detail.…”

Section: E Rezaei Et Al / Ceramics International ∎ (∎∎∎∎) ∎∎∎-∎∎∎supporting

confidence: 43%

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Early-stage oxidation behavior at high temperatures of SiSiC cellular architectures in a porous burner

Rezaei

Haussener

Gianella

et al. 2016

Ceramics International

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a b s t r a c tEarly stage oxidation behavior of SiSiC cellular lattices with different cell types was studied at 1400°C in two different environments: a porous burner and an electric furnace with stagnant air. Oxidation and silicon alloy bead formation were observed and identified as the most important factors affecting the integrity of the structures. Low melting temperature silicon-based alloys formed from the material due to presence of impurities. Having lower melting point than the thermal tests temperature, the beads exuded from the microstructure leaving pores in the substrate material and leading to enhanced oxidation on the surface. Moreover, it was observed that different lattice architectures lead to different oxidation behavior on the struts as a result of the changing gas flow paths inside each ceramic architecture.

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Section: E Rezaei Et Al / Ceramics International ∎ (∎∎∎∎) ∎∎∎-∎∎∎supporting

confidence: 43%

“…Indeed, porous SiSiC has proven to withstand long operating conditions in a combustion environment [6,7]. It has been noted that foams' behavior is strongly affected by the way they interact with the environment during the very initial phases of operation.…”

Section: Introductionmentioning

confidence: 99%

Early-stage oxidation behavior at high temperatures of SiSiC cellular architectures in a porous burner

Rezaei

Haussener

Gianella

et al. 2016

Ceramics International

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“…First, actual foams were scanned by X-ray CMT. The samples A 011 and A 015 are S i S iC foams that had been prepared by slurry impregnation, pyrolysis and reactive silicon infiltration on reticulated polyurethane foam templates [54]. Sample B 011 is a CMTscanned polymer foam that has been numerically densified following a "numerical 5 replica" technique [55].…”

Section: Numerical Materialsmentioning

confidence: 99%

Numerical study of effective heat conductivities of foams by coupled conduction and radiation

Vignoles

Ortona

2016

International Journal of Thermal Sciences

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E↵ective thermal conductivities (ETC) under vacuum were computed numerically on 3D blocks of open-cell foams either obtained by X-ray tomography or generated by Computer-Aided Design (CAD) with ideal geometries.For the first time a Monte-Carlo/Random Walk code accounting for the coupling of conduction in the solid phase and of radiation in the pore space has been used. The whole range of conduction/radiation ratio, parameterized by a Nusselt number, has been scanned; a law relating the ETC to this parameter has been obtained. In all cases the conductive and radiative contributions are additive. The slope of the radiative contribution to the ETC is found to display a distinct behavior, depending on whether radiation or conduction dominates. The low-temperature regime has an emissivity-dependent ETC slope, while the high-temperature regime does not.The critical ratio between both regimes is related to the ratio between cell and strut diameters. In all cases, it is found that the ETC anisotropy decreases with temperature. Closing some windows enhances conduction parallel to the closing walls and reduces radiation perpendicular to them. This e↵ect is shown to influence the ETC eigendirections in actual media.

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“…Most of these problems are related to the long-term stability of ceramics in high-temperature combustion environments. [8][9][10] …”

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confidence: 99%

Cellular Ceramics in Combustion Environments

et al. 2011

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Cellular materials have become increasingly interesting for applications in combustion environments. Improvements like high power efficiency and low emissions are the main targets of technological development in combustion processes. However, despite scientific and technical success in developing new or improved burner concepts over recent years, a lot of problems remain to be solved in the field of materials science: due to the high power density of the burners the materials are subjected to high loads in terms of thermal shock, temperature and corrosion, especially in so‐called porous burner technology. This article shows some examples of research and development strategies and results in developing improved cellular ceramics.

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Aging of reticulated Si-SiC foams in porous burners

Cited by 51 publications

References 15 publications

Early-stage oxidation behavior at high temperatures of SiSiC cellular architectures in a porous burner

Early-stage oxidation behavior at high temperatures of SiSiC cellular architectures in a porous burner

Numerical study of effective heat conductivities of foams by coupled conduction and radiation

Cellular Ceramics in Combustion Environments

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