Progress in the development of coatings for protection of new generation steam plant components

Abstract

Coatings to prevent component oxidation in future supercritical high temperature steam turbines were developed for the first time in Europe during the COST522 programme. Promising results were obtained with slurry applied aluminide coatings and with a series of thermal sprayed coatings (FeAl, FeCrAl, NiCr and AlFeCoCr) deposited on P92. Since then, extensive research internationally has examined coatings to protect against steam oxidation, deposited by techniques including pack cementation, electroplating and chemical vapour deposition (fluidised bed and organometallic as well as thermal). The results of these studies, including steam oxidation and mechanical data are summarised, and the performance of the candidate systems is critically reviewed from the viewpoint of both materials behaviour and deposition technologies. An earlier version of this paper has been published in the proceedings of the "8th Advanced Power Generation" conference held in Liege, Belgium in September 2006. This version has been updated with the latest available results.