Elastic and Conductive Properties of Plasma-Sprayed Ceramic Coatings in Relation to Their Microstructure: An Overview

Abstract

This article focuses on micromechanics-based models that explicitly express the elastic and conductive properties of plasma-sprayed ceramic coatings in terms of relevant microstructural parameters. These parameters reflect, in an integral way, the density and the orientation distribution of microcracks; they apply to strongly oblate pores as well. On the other hand, the porosity parameter usually plays a secondary role. Partial contacts between crack faces-a factor of major importance-are reflected via appropriate reduction of crack densities. The effect of various ''irregularities'' of crack shapes is discussed. Case studies of YSZ coatings demonstrate how the micromechanics-based modeling can be used and directly interfaced with 2-D image data.

Elastic moduli’s relation to microstructure properties in porous media using GSA modeling

“…This partly agrees with the observation of Sevostianov and Kachanov (2009). From Thomsen parameters we can state that S-wave anisotropy are not much affected by aspect ratio lower than 0.1, and Pwave anisotropy is stable when 0.001 0.1 Figure 4: 4a 4b 4c are the relative stiffness, relative compliance and Thomsen parameters with regard to the varying aspect ratio, respectively.…”

Microstructure–Property Connections for Porous Ceramics: The Possibilities Offered by Micromechanics

“…We mention two related topics of importance that we have not covered: (1) the elastic and thermal properties of thermal barrier ceramic coatings in relation to their microstructure, and (2) elasticity–conductivity cross‐property connections for complex microstructures. For these two topics, we refer to the reviews of Sevostianov and Kachanov and , respectively.…”

Influence of columnar grain microstructure on thermal shock resistance of laser re-melted ZrO2-7wt.% Y2O3 coatings and their failure mechanism

“…It is obvious that the number of thermal cycle required for failure of LRCs is much more than that of the APSCs. This is due to the fact that the columnar grains and network cracks in the LRCs are more helpful in increasing the strain tolerance, thereby increasing the thermal shock resistance of the coatings [32,33].…”