Erosion and high temperature oxidation resistance of new coatings fabricated by a sol-gel route for a TBC application.

摘要

This paper examines the erosion and cyclic oxidation performance of novel thermalbarrier coatings produced via the sol-gel route. The ceramic top coat, with a thickness of 5-25µm, was deposited via a sol-gel route onto standard MCrAlY and PtAl bond coats. In both theerosion and the cyclic oxidation tests it was found that the bond coat had a profound affect on theresults. The erosion of the sol-gel coatings were compared to standard EB PVD and PS TBCsand were found to be significantly higher. The effect of aging (100hr at 1100°C) on the erosionrates was also evaluated and was found to increase the erosion rates. The information obtainedfrom the erosion and cyclic oxidation tests have highlighted the need to develop and optimise theparameters for producing thicker coatings.