Coatings for High-Temperature Vibration Damping of Turbines

摘要

The research performed under this grant has been on the high- temperature vibration damping of materials related to use in gas turbines. The research has led to three major accomplishments. The first was the design and construction of the only instrument in the US capable of measuring the flexural damping characteristics of materials up to temperatures of 1150 degrees C in air. This instrument was used to evaluate the damping properties of materials and coatings currently being used, as well as those being contemplated for future use, in the hot, turbine sections of gas turbines in order to establish a data base of high-temperature damping properties and supplied to GE and Pratt & Whitney. The third accomplishment was the identification that the major damping mechanism in oxide thermal barrier coatings is defect hopping in response to the alternating strain reversals generated by flexural vibration and the development of a model for predicting alternative oxide coating materials with both superior damping and thermal conductivity characteristics.