Service Temperature Measurement and Thermal Insulation Mechanism of Thermal Barrier Coatings
Thermal barrier coatings(TBC)are used for thermal protection of aero-engine turbine blade surface,which mainly consist of bond coatings and ceramic coatings.Accurate measurement of temperature distribution on the surface of ceramic coating and bond coating/ceramic coating interface is of great significance for guiding the design and preparation of high-heat insulation structure of coating.At present,the sur-face temperature can be measured by the existing non-contact and contact temperature measurement technologies,and the interface temperature can be measured by the contact temperature measurement technology.In this paper,three kinds of technologies applied to the turbine blade sur-face temperature measurement of aeroengine were introduced.Among them,the thermal barrier coating surface temperature measurement tech-nologies included infrared radiation,fluorescence,crystal and optical fiber,which based on the optical principle,and temperature indicating paint temperature measurement,which based on thermotropic principle.Moreover,the temperature measurement technologies of landfill ther-mocouple and film thermocouple based on thermoelectric principle were applied to the temperature measurements of thermal barrier coating in-terface,and their principle,advantages and limitations were introduced.Furthermore,the thermal insulation mechanism and performance opti-mization of thermal barrier coating were introduced,and the temperature measurement technology of thermal barrier coating surface or interface and the direction of coating structure designs were prospected.
temperature measurement methodheat insulation mechanismthermal barrier coatingthermocouple
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