Prediction of directional spectral emittance of packed ceramic spheres at high temperature

Lopes, Rogério; Moura, Luís; Delmas, A.; Sacadura, J. F.

doi:10.1068/htrt143

Cited by 1 publication

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“…Nevertheless, these properties are modified by extrinsic parameters in the case of porous materials such as ceramics. Some authors [6][7][8][9][10][11][12] pointed out the effect of the structure of ceramics, the roughness, the porosity, the grain and pore size, the birefringence and the role of impurities within the grain boundaries. However, as shown by Grimm et al [8], Budworth [13] and Peelen [6], the effect of the birefringence is negligible compared to the pore size effect.…”

Section: -Introductionmentioning

confidence: 99%

Texture and Porosity Effects on the Thermal Radiative Behavior of Alumina Ceramics

2008

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International audienceThermal and optical properties of ceramics are dependent on radiation scattering and cannot be determined by a knowledge of their chemical composition alone, as for single crystals. In this paper, extrinsic effects, such as roughness, porosity, and texture, on the spectral emissivity of alumina ceramics are investigated. Roughness effects have an influence mainly in the opaque zone; an important porosity dependence and the presence of a critical porosity threshold were observed in the semitransparent zone. Furthermore, it was shown that two ceramics with similar total porosities, but with different textures, possess radically different emissivities, showing that grain size, pore size, and spatial repartition of the grains are also crucial for an understanding of the thermal properties of the ceramics

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