Sputtered ceramic coatings and sealing layers. [Hybrid CoCrAlY/ZrO/sub 2/-20Y/sub 2/O/sub 3/]

Conference · Thu Oct 01 04:00:00 EDT 1981

OSTI ID:5677443

Prater, J T; Patten, J W; Hays, D D; Moss, R W

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
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360300* -- Composite Materials-- (-1987)
ALLOYS
ALUMINIUM ALLOYS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
COATINGS
COBALT ALLOYS
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
DEPOSITION
GAS TURBINES
HEAT TREATMENTS
LAYERS
MACHINERY
MATERIALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PROTECTIVE COATINGS
SPUTTERING
THERMAL CYCLING
TRANSITION ELEMENT COMPOUNDS
TURBINES
TURBOMACHINERY
VARIATIONS
YTTRIUM ALLOYS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES