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A gas turbine's level of efficiency is linked to the compression ratio and to the operating temperature. Alloys with an Ni or Co base alone no longer satisfy the pressing need for ever higher operating temperatures (above 1000 C). Air Plasma Spray (APS) and Vacuum Plasma Spray (VPS) allow surface problems (corrosion, erosion, wear and tear) to be resolved separately from the mechanical problems of the structure. Layers of MCrAlY VPS which offer protection against sulphur corrosion and oxidation have been applied to IN 100, IN 738 and UD 720. Anti-wear layers of the Tribaloy T 800 type and cermetes (MCrAlY/Al(2)O(3)) have been applied to various alloys. The samples produced have undergone chemical and structural examinations and adherence and thermal shock tests. Coatings of ZrO(2) are being studied in order to clarify the relationship between the parameters of the coatings and their thermo-mechanical features.

Additional information

Authors: BROSSA F, JRC Ispra (IT);LOOMAN B, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Materiali per Parti Calde di Turbine a Gas in Applicazioni Terrestri, Milano (IT), May 22, 1991
Availability: Available from (1) as Paper IT 36220 ORA
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