Damage resistant thermal barrier coating and method
AssigneeSiemens Energy, Inc.
InventorDavid G. Sansom
Life of this patent
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Abstract
A compliant, impact-absorbing layer (27) on a thermal barrier coating (TBC) (26) on a substrate (24). The impact-absorbing layer (27) has an internal structure of planar grains (28) oriented parallel to the substrate so the impact-absorbing layer preferentially fractures horizontally and it blocks vertical cracking. A ceramic armor layer (30) on the impact-absorbing layer has a higher density, and is fractured (32) into fracture plates (33, 34) of a designed size. This provides a thermal barrier with particle impact-resistance that may be applied to gas turbine components where needed.
Claims9
A damage resistant thermal barrier coating, comprising:
- a thermal barrier layer (TBC) on a component substrate;
- an impact-absorbing layer on the thermal barrier layer, wherein the impact-absorbing layer comprises an anisotropic internal structure that stops fractures normal to the substrate and preferentially fractures parallel to the substrate;
- and
- an armor layer on the impact-absorbing layer, wherein the armor layer has a density that is higher than a density of the impact-absorbing layer, and the armor layer comprises fractures normal to the substrate forming a pattern of fracture plates in a design size range.
A damage resistant thermal barrier coating, comprising:
- a ceramic thermal barrier layer on a component substrate;
- a porous, compliant, impact-absorbing ceramic layer on the thermal barrier layer, wherein the impact-absorbing ceramic layer comprises an internal structure of planar grains oriented parallel to the substrate, and has less than 75% of theoretical density;
- and
- a ceramic armor layer on the impact-absorbing layer, wherein the ceramic armor layer has greater than 95% of theoretical density and is fractured into fracture plates with an average diameter of 0.5 to 1.5 mm.
Dependencies are inferred from the claim text.