| 摘要 |
A superalloy article 20 has a multilayer coating 22 comprising a chromium, titanium and/or tantalum and silicon enriched layer 24, a platinum aluminide coating 26, an alumina layer 28 and a ceramic thermal barrier coating 30. The platinum aluminide coating 26 is a very good corrosion and oxidation protective coating for the superalloy article 20. The chromium and silicon enriched layer 24 prevents silicon in the platinum aluminide-silicide coating diffusing to the superalloy article 20 to minimise the formation of silicon rich topologically close packed phases at the interface between the superalloy article 20 and the multilayer coating 22. The system forms a good bond coating for the ceramic thermal barrier coating 30. The chromium, titanium and/or tantalum may be applied by chromising or sputtering. Additional steps include depositing yttrium, zirconium or erbium. |
