MRS Bulletin

Thermal-barrier coatings for more efficient gas-turbine engines

Thermal-barrier coatings for more efficient gas-turbine engines

Testing and evaluation of thermal-barrier coatings

Robert Vaßena1, Yutaka Kagawaa2, Ramesh Subramaniana3, Paul Zomboa4 and Dongming Zhua5

a1 Institute of Energy and Climate Research, Forschungszentrum Jülich GmbH, Germany; r.vassen@fz-juelich.de

a2 Research Center for Advanced Science and Technology, The University of Tokyo, Japan; kagawa@rcast.u-tokyo.ac.jp

a3 Siemens Energy Inc., Orlando, FL; Ramesh.Subramanian@siemens.com

a4 Engine and Component Diagnostics, Siemens Energy Inc., Orlando, FL; Paul.Zombo@siemens.com

a5 Durability and Protective Coatings Branch, Structures and Materials Division, NASA Glenn Research Center, Cleveland, OH; dongming.zhu@nasa.gov

Abstract

Thermal-barrier coatings are complex systems with properties that largely depend on their specific microstructure. Their properties change during operation, typically leading to degradation. A further difficulty arises from the fact that this degradation also depends on specific loading conditions that can be rather complex. Different laboratory setups are described that simulate, at least partially, the actual loading conditions. In addition, sensing and nondestructive methods are described that are targeted toward reliable operation of a gas-turbine engine with thermal-barrier coated components.

Key Words:

  • Luminescence;
  • fatigue;
  • laser heat flux;
  • sintering;
  • thermal conductivity
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