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YAG thermal barrier coatings deposited by suspension and solution precursor thermal spray
- Source :
- Ceramics International. 47:23803-23813
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- Yttrium aluminium garnet (YAG) is a promising topcoat material for thermal barrier coatings due to its high temperature stability and better CMAS (calcium-magnesium-alumino-silicate) resistance. YAG topcoats were deposited by suspension and solution precursor high-velocity oxy-fuel (HVOF) thermal spray. The relationships between processing, microstructure and final properties were studied through a range of characterization techniques and thermal cycling tests. The microstructure of the as-sprayed YAG topcoat from stoichiometric solution precursor (SP-YAG) had distributed pores and inter-splat boundaries, while the as-sprayed topcoat produced from suspension (S-YAG) had vertical and branched micro cracks, pores, and inter-splat boundaries. Both as-sprayed coatings were composed of amorphous phase, hexagonal yttrium aluminium perovskite (YAP) and cubic YAG. In thermal cycling tests, 20% of SP-YAG failure was reached after the 10th cycle; whereas, S-YAG reached the failure criteria between the 60th and 70th cycle. The failure of both the SP-YAG and the S-YAG topcoats occurred due to thermal stresses during the thermal cycling.
- Subjects :
- 010302 applied physics
Materials science
Process Chemistry and Technology
02 engineering and technology
Temperature cycling
021001 nanoscience & nanotechnology
Microstructure
01 natural sciences
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Thermal barrier coating
chemistry.chemical_compound
chemistry
Yttrium aluminium garnet
0103 physical sciences
Materials Chemistry
Ceramics and Composites
Composite material
0210 nano-technology
Thermal spraying
Suspension (vehicle)
Stoichiometry
Perovskite (structure)
Subjects
Details
- ISSN :
- 02728842
- Volume :
- 47
- Database :
- OpenAIRE
- Journal :
- Ceramics International
- Accession number :
- edsair.doi...........0e009ebc4e5209d0fb4bd8a62a556ef3