Non destructive monitoring of microstructure changes of a component ( layer system, turbine blades, liners of a combustion chamber )

摘要

Method for monitoring degradation of a layer system caused by thermal and mechanical overloading. According to the method electrical, mechanical and or material parameters of the layer system are monitored over time by repeated measurement and comparison. An example of the method is monitoring a ceramic thermal insulation layer (10) in which pores (13) provide an effective thermal shock behavior. During use in a turbine the pores are sintered with a resultant reduction in the pore size (16). Thus to monitor degradation, pore size is measured over time.