Effect of pre-aluminization on the properties of ZrO[sub 2]-8 wt. % Y[sub 2]O[sub 3]/Co-29Cr-6Al-1Y

Journal Article · Sat Aug 01 00:00:00 EDT 1992 · Oxidation of Metals; (United States)

DOI:https://doi.org/10.1007/BF00665047· OSTI ID:6999042

Lih, W; Chang, E ^[1]; Chao, C H; Tsai, M L ^[2]

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1. National Cheng-King Univ., Tainan (Taiwan)
2. Aero Engine Factory/Aero Industry Development Center, Kang-San (Taiwan)

Specimens of investment-cast Mar-M247 superalloy were vacuum-plasma sprayed with Co-29Cr-6Al-1Y bond coat, and part of the specimens were further pre-aluminized at 980C for 2, 4, 6, 8, and 10 hours. All the specimens were then deposited with ZrO[sub 2]-8 wt.% Y[sub 2]O[sub 3] thermal-barrier coatings (TBCs) and thermally cycled at 1,050C to evaluate the effect of time of the pre-aluminizing treatment on the performance and failure mechanism of the modified system. Results showed that TBC specimens with pre-aluminized bond coatings exhibited lower oxidation rates and significantly higher cyclic life when compared with unaluminized specimens. The failure of bond-coat pre-aluminized TBC specimens was observed to propagate mainly along the lamellar splats of the top coat, whereas the failure of conventional TBC specimens occurred mainly along the top-coat/spinel oxides interface.

• OSTI ID: 6999042
• Journal Information: Oxidation of Metals; (United States), Vol. 38:1-2; ISSN 0030-770X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
PLASMA ARC SPRAYING
CHROMIUM ALLOYS
COBALT ALLOYS
COMPOSITE MATERIALS
MECHANICAL PROPERTIES
OXIDATION
HEAT RESISTING ALLOYS
SPRAYED COATINGS
YTTRIUM OXIDES
ZIRCONIUM OXIDES
ALUMINIUM
CORROSION RESISTANCE
EXPERIMENTAL DATA
FAILURES
HAFNIUM ADDITIONS
LAYERS
MOLYBDENUM ADDITIONS
MORPHOLOGY
NICKEL BASE ALLOYS
SCANNING ELECTRON MICROSCOPY
TANTALUM ALLOYS
TITANIUM ADDITIONS
TUNGSTEN ALLOYS
TURBINES
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY
YTTRIUM ADDITIONS
ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
COATINGS
COHERENT SCATTERING
DATA
DEPOSITION
DIFFRACTION
ELECTRON MICROSCOPY
ELEMENTS
EQUIPMENT
HAFNIUM ALLOYS
HEAT RESISTANT MATERIALS
INFORMATION
MACHINERY
MATERIALS
METALS
MICROSCOPY
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SCATTERING
SPECTROSCOPY
SPRAY COATING
SURFACE COATING
TITANIUM ALLOYS
TRANSITION ELEMENT COMPOUNDS
TURBOMACHINERY
YTTRIUM ALLOYS
YTTRIUM COMPOUNDS
ZIRCONIUM COMPOUNDS
360601* - Other Materials- Preparation & Manufacture
360604 - Materials- Corrosion
Erosion
& Degradation
360603 - Materials- Properties