Improvement of sputtered oxide coating adherence and integrity for turbine airfoil applications. Combustion zone durability program. Task III: dense surface sputtered ceramic coatings. Annual technical progress report, October 1, 1978-September 30, 1979
Two aspects of the durability of modified ZrO/sub 2/ ceramic thermal barrier coatings for gas turbine airfoils are being investigated in this program. First, adherence of coatings of these materials has historically been difficult to achieve due to mismatch in thermal expansion coefficients and other properties between ceramic coatings and metallic substrates. Second, if the ceramic coatings are discontinuous, as for many plasma sprayed coatings, then condensate from the combustion environment may permeate the coating and volume changes in this condensate during subsequent service cycles may produce coating spallation. The adherence problem was approached by seeking to sputter deposit ceramic coatings over either sputter-etched, closely spaced, high aspect ratio substrate surface cones or by sputter depositing ceramic coatings over sputtered CoCrAlY coatings containing a very high density of columnar voids (leaders). The objective in both instances was to provide a compliant fibrous metal attachment between metal substrate and ceramic coating to absorb property mismatches. The permeability problem was approached both by coating a segmented (fibrous columnar) ceramic layer with a continuous and impervious metal sealing layer that is not required to provide structural strength or insulation, and by coating the segmented ceramic layer with a continuous layer of the same ceramic material.
- Research Organization:
- Battelle Pacific Northwest Labs., Richland, WA (United States)
- DOE Contract Number:
- EY-76-C-06-1830
- OSTI ID:
- 5477078
- Report Number(s):
- PNL-3289
- Country of Publication:
- United States
- Language:
- English
Similar Records
Sputtered ceramic coatings and sealing layers. [Hybrid CoCrAlY/ZrO/sub 2/-20Y/sub 2/O/sub 3/]
Effect of coating structure on the adherence of sputter-deposited oxide coatings. [ZrO/sub 2/-Y/sub 2/O/sub 3/; Al/sub 2/O/sub 3/-Cr/sub 2/O/sub 3/]
Related Subjects
36 MATERIALS SCIENCE
GAS TURBINES
TURBINE BLADES
COATINGS
ZIRCONIUM OXIDES
DEPOSITION
CERAMICS
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RESEARCH PROGRAMS
SPUTTERING
THERMAL CYCLING
THERMAL INSULATION
CHALCOGENIDES
MACHINERY
OXIDES
OXYGEN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TURBINES
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