Abstract
“Nano-sized” or “nano-structured” materials correspond to particle diameters or an internal structure with at least one dimension smaller than 100 nm. The thermal spray community has been actively involved in this area for more than 30 years. Due to the large volume fraction of the internal interfaces, nano-structured coatings exhibit better properties, especially toughness, thanks to crack arresting effect. However, nano-sized particles can be injected in plasma jets only with a liquid carrier as either suspensions (Suspension Plasma Spray, SPS) of nanometer-sized particles or solutions (Solution Plasma Spray Process, SPPS) of reacting elements forming particles. However, a few problems must be solved:
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How droplets and sub-micrometer particles behave in spray jets and what are the measuring tools available?
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Is it possible to follow the formation of splats with particles below a few micrometers?
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How optimizing the liquid injection and its matching with the spray torch?
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What is the interest to spray coatings with mixtures of micrometer and nanometer-sized particles?
Among the different coatings studied many works have been related to thermal barrier coatings (TBCs) to compete, at lower price, with Electron Beam-Physical Vapor Deposition (EB-PVD) or Plasma Spray-Physical Vapor Deposition (PS-PVD) and also to achieve TBCs with a better resistance to Ca50Mg10Al10Si30 (CMAS).
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Abbreviations
- APG :
-
Advanced Plasma Gun
- APS :
-
Atmospheric Plasma Spraying
- CMAS :
-
Ca50Mg10Al10Si30
- DC :
-
Direct Current
- DCLC :
-
Double Ceramic Layer Coatings
- EB-PVD :
-
Electron Beam-Physical Vapor Deposition
- GLR :
-
Gas-to-Liquid Mass Ratio
- GZO :
-
Gadolinium Zirconate
- HVOF :
-
High Velocity Oxy-Fuel
- IPBs :
-
Inter-Pass Boundaries
- LAMT :
-
La(Al1/4Mg1/2Ta1/4)O3
- LSCF :
-
La1−xSrxCo1−yFeyO3−δ
- LZ :
-
Lanthanum Zirconate (La2Zr2O7)
- OFGC :
-
Optimized Functionally Graded Coating
- PIV :
-
Particle Image Velocimetry
- PS-PVD :
-
Plasma Sprayed-Physical Vapor Deposition
- SCLC :
-
Single Ceramic Layer Coatings
- SPS :
-
Suspension Plasma Spraying
- SPPS :
-
Solution Precursor Plasma Spraying
- St :
-
Stokes Number
- TBCs :
-
Thermal Barrier Coatings
- TEC :
-
Thermal Expansion Coefficient
- TGO :
-
Thermally Grown Oxide
- USAXS :
-
Ultra-Small-Angle X-rays Scattering
- We :
-
Weber Number
- YAG :
-
Y3Al5O12
- YSZ :
-
Yttria Stabilized Zirconia
- Z :
-
Ohnesorge Number
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Fauchais, P., Vardelle, M., Vardelle, A., Goutier, S. (2018). Sprays Used for Thermal Barrier Coatings. In: Basu, S., Agarwal, A., Mukhopadhyay, A., Patel, C. (eds) Droplet and Spray Transport: Paradigms and Applications. Energy, Environment, and Sustainability. Springer, Singapore. https://doi.org/10.1007/978-981-10-7233-8_12
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