Abstract
As the firing temperatures of land-based gas turbines have increased in recent years, greater demands are being made on component materials. In particular, the increased surface metal temperatures of first stage buckets has shifted the nature of the protection required of bucket coatings from that of strictly high temperature hot corrosion resistance to that of both hot corrosion and oxidation protection. Characteristics of low temperature hot corrosion, high temperature hot corrosion and high temperature oxidation are presented. An overview of GE bucket coating materials is given and related to the types of corrosion and/or oxidation protection they provide. Evaluation of buckets removed from high firing, heavy duty gas turbines is presented. A new, more oxidation resistant coating, PLASMAGUARD™ GT-2 9 PLUS, developed and tested by GE to provide both oxidation and corrosion protection, is described. Bucket coating refurbishment recommendations are also made to maximize first stage bucket life. Current and future GE developmental work, both compositional and process, aimed at further improvements in bucket coating materials for oxidation protection of first stage buckets is also presented.
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