Metallic article having a thermal barrier coating and a method o

Details Metallic article having a thermal barrier coating and a method o Metallic article having a thermal barrier coating and a method o

1998-08-03

2000-08-29

Speer, Timothy M.

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428141, 428632, 428633, 416241R, 416241B, 4272481, 42725519, 427566, 427567, 2041921, B32B 1500, B32B 1800, C23C 1400, C23C 1600

Patent

active

061106046

ABSTRACT:
A metallic article includes a bond coating and a ceramic thermal barrier coating on the bond coating. The ceramic thermal barrier coating includes a plurality of columnar grains extending substantially perpendicularly to the surface of the metallic article. Each columnar gain has a plurality of first layers, a plurality of second layers and a plurality of third layers. The first layers have a different structure from the second layers and the third layers. The second layers have a different structure from the third layers. The first layers have the same composition as the third layers. The second layers have a greater proportion of voids than the first layers and the third layers. The voids reduce the thermal conductivity of the thermal barrier coating. The second layers may also have a different composition from the first layers and the third layers to reduce the thermal conductivity.

REFERENCES:
patent: 4764089 (1988-08-01), Strangman
patent: 5350599 (1994-09-01), Rigney et al.
patent: 5512382 (1996-04-01), Strangman
patent: 5652044 (1997-07-01), Rickerby

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