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Gas turbine engines operate under the conditions of high
temperature and stresses, and the engine components are also
subjected to corrosion, oxidation and abrasion. Ceramic Thermal
barrier coatings (TBCs) when deposited onto the hot sections of
turbine engines improve their performance. TBCs have porosity by
design, the architecture of which depends on the processing route.
The presence of porosity gives rise to its low thermal conductivity
and high strain tolerance. The porosity and its architecture can be
significantly affected in service, thus changing the properties of
the TBC and hence impairing its performance. Understanding the
changes in pore architecture and relating it to changes in
properties in-service thus forms an important objective. This book,
suitable for engineering undergraduates, postgraduates and
professionals, therefore, describes the materials' issues involved
in the development of ceramic TBCs together with a brief overview
of the current TBC systems, their porosity and pore architecture,
thermal and mechanical properties, and techniques available for
measuring these properties.
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