Vacuum Plasma Spray Turbine Bucket Coating Development

This paper describes the vacuum plasma spray (VPS) turbine bucket coating development work conducted by the General Electric Company, Gas Turbine Division. The potential for corrosion in gas turbine buckets is described, and examples of the different types of hot corrosion are shown. Development of the first VPS coating (PLASMAGUARD* GT-29) is discussed, and corrosion laboratory burner test and field test results are presented. Coating development work aimed at low-temperature hot-corrosion conditions is also summarized. Laboratory test results on a new PLASMAGUARD coating (GT-43) developed for low-temperature hot corrosion are presented. The new General Electric Gas Turbine Division VPS coating manufacturing facility used to apply these coatings is also described.Copyright © 1985 by ASME