Sputtered ceramic coatings and sealing layers. [Hybrid CoCrAlY/ZrO/sub 2/-20Y/sub 2/O/sub 3/]
Progress on the development of hybrid ceramic/metal sputter deposited coatings which are designed to be adherent to metal substrates in gas turbine hot sections is reported. The ceramic materials investigated are ZrO/sub 2/ + 20% Y/sub 2/O/sub 3/ and pure Al/sub 2/O/sub 3/. The metal is CoCrAlY. In general, a CoCrAlY layer is sputter deposited first. The composition is then graded so that the ceramic content increases towards the coating surface. This transition zone has a segmented (columnar) structure, and varies in thickness. In some cases, the coating surface still contained some CoCrAlY. Heat treatments have been conducted on these deposits in an effort to provide a continuous metal (minority phase) matrix along the ceramic grain boundaries. For other deposits, the grading is continued until no metal is present, and a thick layer of pure ceramic has been deposited over the graded material. Preliminary thermal cycle results, microstructural characterization, and composition profile data are presented.
- Research Organization:
- Pacific Northwest Lab., Richland, WA (USA)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 5677443
- Report Number(s):
- PNL-SA-9961; CONF-810885-3; ON: DE82005225
- Resource Relation:
- Conference: 2. conference on advanced materials for alternative fuel capable heat engines, Monterey, CA, USA, 24 Aug 1981
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM ALLOYS
DEPOSITION
CHROMIUM ALLOYS
COBALT ALLOYS
GAS TURBINES
PROTECTIVE COATINGS
YTTRIUM ALLOYS
YTTRIUM OXIDES
ZIRCONIUM OXIDES
CHEMICAL COMPOSITION
COMPOSITE MATERIALS
HEAT TREATMENTS
LAYERS
MICROSTRUCTURE
SPUTTERING
THERMAL CYCLING
VARIATIONS
ALLOYS
CHALCOGENIDES
COATINGS
CRYSTAL STRUCTURE
MACHINERY
MATERIALS
OXIDES
OXYGEN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TURBINES
TURBOMACHINERY
YTTRIUM COMPOUNDS
ZIRCONIUM COMPOUNDS
360300* - Composite Materials- (-1987)