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CHAPTER 2 LITERATURE REVIEW from CMAS degradation, some factors should also be considered such as adhesion, surface hardness or even thermal-mechanical mechanisms. Figure 2.10 Cross-sectional image demonstrates the complete suppression of CMAS melt ingression into the coating assembly [49] 2.3.2 Doping Elements Doping Alumina and titanium oxide is another way to reduce the effect of CMAS penetration, although alumina and titanium oxide have little solubility in YSZ [41]. The atomic level mixing of the constituent elements (i.e. ZrO2, Y2O3, Al2O3, and TiO2) in the chemically prepared feedstock and rapid fabrication process kinetically suppresses the precipitation and extends the solubility [54,55]. According to Drexler, doped alumina and titanium oxide top coat provides high resistance to the CMAS penetration. CMAS only penetrates the APS YSZ doping Al2O3 and TiO2 TBCs sample 40 - 50 μm depth in 24 hours isothermal heat treatment at 1200 °C. After interaction, YSZ remains in the tetragonal phase and the reaction product anorthite has been found in the arrest area [38]. Page 37PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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