Thermal barrier coatings having an improved columnar microstruct

Details Thermal barrier coatings having an improved columnar microstruct Thermal barrier coatings having an improved columnar microstruct

1996-07-29

1998-11-03

Nguyen, Ngoc-Yen

Stock material or miscellaneous articles

All metal or with adjacent metals

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

428 632, 428633, 428678, 428680, 428660, 428472, 428136, B32B 1504

Patent

active

058305866

ABSTRACT:
An article having a spallation resistant TBC comprises a metal substrate, such as a high temperature superalloy, and a TBC, such as a coating of yttria stabilized zirconia. The TBC comprises a plurality of plasma-sprayed layers. The TBC has a coherent, continuous columnar grain microstructure, wherein at least one layer has a plurality of continuous columnar grains which have been extended by directional solidification into an adjacent layer. In a preferred embodiment, the coherent, continuous columnar microstructure comprises substantially all of the volume of TBC. A coherent, continuous columnar grain microstructure is also taught wherein at least some of the plurality of coherent, continuous columnar grains which comprise a TBC extend through essentially the entire thickness of the coating. A columnar crack pattern of cracks extending generally normal to the surface of the metal substrate is also developed within TBCs of the present invention in conjunction with the coherent, continuous columnar grain microstructures described.

REFERENCES:
patent: 4321311 (1982-03-01), Strangman
patent: 4457948 (1984-07-01), Ruckle et al.
patent: 4676994 (1987-06-01), Demaray
patent: 4880614 (1989-11-01), Strangman et al.
patent: 5073433 (1991-12-01), Taylor
patent: 5238752 (1993-08-01), Duderstadt et al.
patent: 5413871 (1995-05-01), Nelson et al.
Experimental and Theoretical Aspects of Thick Thermal Barrier Coatings for Turbine Applications, V. Wilms, et al., Thermal Spray: Advances in Coatings Tech., Proceedings of the Nat'l Thermal Spray Conf., Orlando, FL; Sep. 1987, pp. 155-166.
Thermal Fatigue of Plasma Sprayed MgO.ZrO2 and ZrO2-6.6Y2O3 Thermal Barrier Coatings, T.A. Taylor et al., Presented at the 84th Annual Meeting American, Ceramic Society, (May 4, 1982) Coatings Service, Engineering Products Division, Union Carbide Div. (20 pages).
AIAA-80-1193 Development of Improved Durability Plasma Sprayed Ceramic Coatings for Gas Turbine Engines, I.E. Sumner, AIAA/SAE/ASME 16th Joint Propulsion Conference (Jun. 30-Jul. 2, 1980) pp. 1-8 and 10-13.

Affiliated with

Also associated with

Rating

Thermal barrier coatings having an improved columnar microstruct does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Thermal barrier coatings having an improved columnar microstruct, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermal barrier coatings having an improved columnar microstruct will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-687460