Effects of bond coat preoxidation on the properties of ZrO sub 2 -8wt. % Y sub 2 O sub 3 /Ni-22Cr-10Al-1Y thermal-barrier coatings

Journal Article · Tue Oct 01 00:00:00 EDT 1991 · Oxidation of Metals; (United States)

OSTI ID:5457869

Lih, W; Chang, E ^[1]; Wu, B C ^[2]; Chao, C H ^[3]

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1. National Cheng Kung Univ., Tainan (Taiwan)
2. Materials Research Labs., Hsinschu (Taiwan)
3. Aero Industry Development Center, Kang-Shan (Taiwan)

Plasma-sprayed thermal barrier coatings (TBCs) consist of an intermediate MCrAlY bond coat to protect the substrate superalloy from oxidation/hot corrosion and a thermal insulating zirconia-based ceramic top coat. This system is developed for advanced turbine-engine, hot-section components. In this study the as-sprayed NI-22Cr-10Al-1Y bond coat was subjected to preoxidation treatment of 1,000C for 1, 50, 100, and 200 hr, also at 1,100C, 1,200C and 1,300C for 1 hr to form an oxide scale before subsequent deposition of a ZrO{sub 2}-8wt% Y{sub 2}O{sub 3} top coat. The oxidation kinetics were measured, and the phase constitution and morphology of pregrown oxides on the Ni-22Cr-1Y bond coat were analyzed by x-ray diffractometer and SEM/EDS to elucidate the improvement and degradation mechanisms of the new system. The results of the experiments in this study showed that the tentative ZrO{sub 2}-8wt.% Y{sub 2}O{sub 3} TBC specimens with preoxidized Ni-22Cr-10Al-1Y bond coat, when properly processed, exhibited lower oxidation rates and generally longer lifetime compared with traditional TBC specimens.

• OSTI ID: 5457869
• Journal Information: Oxidation of Metals; (United States), Vol. 36:3-4; ISSN 0030-770X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
OXIDATION
CHROMIUM ALLOYS
NICKEL BASE ALLOYS
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
COMPOSITE MATERIALS
EXPERIMENTAL DATA
HEAT RESISTING ALLOYS
MICROSTRUCTURE
MORPHOLOGY
PHASE STUDIES
PROTECTIVE COATINGS
SCANNING ELECTRON MICROSCOPY
SERVICE LIFE
SPRAY COATING
SPRAYED COATINGS
THERMAL CYCLING
THERMAL INSULATION
TURBINES
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY
YTTRIUM ADDITIONS
YTTRIUM OXIDES
ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
COATINGS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DATA
DEPOSITION
DIFFRACTION
ELECTRON MICROSCOPY
EQUIPMENT
HEAT RESISTANT MATERIALS
INFORMATION
KINETICS
MACHINERY
MATERIALS
MICROSCOPY
NICKEL ALLOYS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
SCATTERING
SPECTROSCOPY
SURFACE COATING
TRANSITION ELEMENT COMPOUNDS
TURBOMACHINERY
YTTRIUM ALLOYS
YTTRIUM COMPOUNDS
360604* - Materials- Corrosion
Erosion
& Degradation