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Structure and thermal properties of heat treated plasma sprayed ceria–yttria co-stabilized zirconia coatings
- Source :
- Ceramics International. 36:961-968
- Publication Year :
- 2010
- Publisher :
- Elsevier BV, 2010.
-
Abstract
- Thick plasma sprayed thermal barrier coatings are suitable for thermal and hot corrosion protection of metal components in land-based turbine and diesel engines. In this work, ceria–yttria co-stabilized zirconia coatings were deposited by atmospheric plasma spraying in a mixture of non-transformable tetragonal t′ and cubic c zirconia phases. Free-standing coatings were isothermally annealed at 1315 °C for different times and their crystal structure was studied by XRD. No phase decomposition occurred. Columnar grains grew in the molten splats with increasing annealing time according to a preferential direction and, after 50 h of heat treatment, they were partially replaced by equiaxed grains. Both in-plane and out-of-plane thermal expansion coefficients (CTEs) were measured from coating expansion during heating. The CTE was slightly sensitive to thermal exposure in out-of-plane direction, whereas it kept almost constant in plane direction. The specific heat capacity Cp of annealed coatings, measured by differential scanning calorimetry (DSC), decreased in comparison with as-sprayed coating, due to high-temperature sintering.
- Subjects :
- Materials science
Annealing (metallurgy)
Process Chemistry and Technology
Sintering
engineering.material
Thermal expansion
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Thermal barrier coating
Differential scanning calorimetry
Coating
Materials Chemistry
Ceramics and Composites
engineering
Cubic zirconia
Composite material
Yttria-stabilized zirconia
Subjects
Details
- ISSN :
- 02728842
- Volume :
- 36
- Database :
- OpenAIRE
- Journal :
- Ceramics International
- Accession number :
- edsair.doi...........e0e2d4b8f837f157520806ed386dda61