Körper mit Hochtemperatur-Schutzschicht und Verfahren zum Beschichten

• Main Authors: CONNOR, WILLIAM BRYAN, SCHAEFFER, JON CONRAD, FIELD, ROBERT DOUGLAS
• Format: Patent
• Language: German
• Published: 16.05.2002
• Edition: 7
• Subjects: BLASTING; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; ENGINE PLANTS IN GENERAL; HEATING; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; METALLURGY; NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES; STEAM ENGINES; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; WEAPONS

A coating system, coated article and method are provided which yield a thermal barrier coating (26) having good adhesion to a bond coat (24) overlying a metal superalloy substrate (22). The adhesion of the bond coat (24) and the thermal barrier coating (26) (TBC) is achieved by formation of a mature alpha -Al203 (rhombohedral) scale (28) at the bond coat/TBC interface. The adhesion of the thermal barrier coating (26) to the bond coat (24) is enhanced by utilizing one or more of the following steps (1) preoxidation of the bond coat (24), (2) inoculation of the surface of the bond coat (24), (3) surface doping of the bond coat surface, and (4) the addition of noble metals. The above step improves the formation of alpha -Al203 which improves the adhesion of the TBC to the bond coat by avoiding undesired oxide phase transformations.