Entwicklung und Reproduzierbarkeit von plasmagespritzten TBCs (Spraying and Improving Reproducible Plasma Sprayed Thermal Barrier Coatings)

The new Triplex-burner was used to develop 7 wt% Y₂O₃ stabilised ZrO₂ thermal barrier coatings and to optimise the process parameters with respect to reproducibility. The investigations were focused on spray efficiency and coating porosity. Porosity levels and porosity distribution were measured with mercury intrusion, which turned out to be a very reliable characterisation technique. High reproducibility could be achieved in particular for low argon fluxes: the deviation of the porosity levels was below about 4%. Paper text in German.