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Synchrotron x-ray μ-tomography to model the thermal radiative properties of an opaque ceramic coating at T = 1000 K

Published online by Cambridge University Press:  31 January 2011

B. Rousseau ,
H. Gomart ,
D. Zanghi ,
D. Bernard  and
M. Stampanoni
D. Zanghi
Affiliation:
Conditions Extrêmes et Matériaux: Haute Température et Irradiation, 45071 Orléans, France
D. Bernard
Affiliation:
Institut de Chimie de la Matière Condensée de Bordeaux, 33608 Pessac, France
M. Stampanoni
Affiliation:
Swiss Light Source (SLS), Paul Sherrer Institute (PSI), Villigen, Switzerland; and Institute for Biomedical Engineering, University and Eidgenössische Technische Hochschule (ETH) Zürich, Zürich, Switzerland
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Abstract

Synchrotron x-ray μ-tomography has been used to reconstruct the three-dimensional view of a rough surface extracted from a heterogeneous ceramic coating composed of Pr2NiO4+δ. Radiographs with a resolution of 0.7 μm have been recorded at T = 300, 600, and 900 K. The analysis of surface geometry makes use of the geometrical optic approximation up to T = 900 K possible. Subsequently, a large number of rays (105) are impinged onto the numerical surface, as revealed by x-ray tomography, to reproduce the normal emissivity of the coating. This normal emissivity was obtained beforehand by infrared emittance spectroscopy at T = 1000 K. Comparison of the two approaches suggests that the optical contribution of the coating micropores can be integrated into the ray tracing code. The effective medium approximation is used for this purpose. Finally, the applicability of this hybrid approach is discussed.

Keywords

CoatingOptical propertiesX-ray tomography
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 10 , October 2010 , pp. 1890 - 1897
Copyright
Copyright © Materials Research Society 2010

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