Improvement of the oxidation resistance of superalloys by low-pressure, plasma-sprayed MCrAlYTa coatings. I
The oxidation behavior of two superalloys (CMSX2 and IN100) protected by low-plasma-pressure-sprayed MCrAlYTa coatings (M = Co, Ni) was studied with emphasis on the kinetics and microstructural aspects. The oxidation behavior of each alloy (substrate and coating) was studied separately in order to obtain a better understanding of the oxidation mechanism of duplex systems (coated substrate) under both isothermal and cyclic conditions (mainly at 1100/degrees/C and in 1 atm O/sub 2/). Although all these systems develop an alumina scale, differences were observed as a result of several factors: (1) the coating and substrate composition, thus the presence, amount and distribution of addition elements (Y, Ta, Ti, C, ...); (2) the interdiffusion phenomena that induce microstructural modifications; and (3) the porosity amount and roughness of the coating. The system that appears to be the most resistant against cyclic oxidation consists of CoNiCrAlYTa-coated IN100. This cannot be explained by the present study. Further work was conducted, particularly on the oxidation stresses, as described and discussed in paper II.
- Research Organization:
- Universite Paris-Sud, Orsay (France)
- OSTI ID:
- 5931001
- Journal Information:
- Oxid. Met.; (United States), Vol. 30:3-4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COBALT BASE ALLOYS
PLASMA ARC SPRAYING
HEAT RESISTING ALLOYS
PROTECTIVE COATINGS
NICKEL BASE ALLOYS
SPRAYED COATINGS
CORROSION RESISTANCE
ALLOY-IN-100
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
CORROSION PROTECTION
DIFFUSION
METALLURGICAL EFFECTS
MICROSTRUCTURE
OXIDATION
PHOTOELECTRON SPECTROSCOPY
POROSITY
ROUGHNESS
SCALING
SCANNING ELECTRON MICROSCOPY
STRESSES
TANTALUM ALLOYS
TEMPERATURE EFFECTS
THERMAL CYCLING
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY
YTTRIUM ALLOYS
ALLOY-NI60CO15CR10AL6TI5MO3
ALLOYS
BORON ADDITIONS
BORON ALLOYS
CARBON ADDITIONS
CHEMICAL REACTIONS
COATINGS
COBALT ALLOYS
COHERENT SCATTERING
COPPER ADDITIONS
COPPER ALLOYS
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
DEPOSITION
DIFFRACTION
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
HEAT RESISTANT MATERIALS
IRON ADDITIONS
IRON ALLOYS
MATERIALS
MICROSCOPY
MOLYBDENUM ALLOYS
NICKEL ALLOYS
SCATTERING
SPECTROSCOPY
SPRAY COATING
SURFACE COATING
SURFACE PROPERTIES
TITANIUM ALLOYS
VANADIUM ADDITIONS
VANADIUM ALLOYS
ZIRCONIUM ADDITIONS
ZIRCONIUM ALLOYS
360105* - Metals & Alloys- Corrosion & Erosion
360102 - Metals & Alloys- Structure & Phase Studies