PROTECTION OF MATERIALS BY ADVANCED HIGH-TEMPERATURE COATINGS

Coatings are mandatory to protect hot components in turboengines and energy producing systems. The materials or alloys of these components are, indeed, subjected to a number of attacks which include oxidation, sulphidation, carburisation, chlorination, fluorination, hot corrosion by molten salt deposits and erosion/corrosion. Since 40 years a considerable number of coatings have been perfected to answer this problem. In this paper the wealth of available coatings and coating deposition processes are reviewed and a classification is proposed to shed some light in this maze of coatings.