Volcanic Ash Degradation on Thermal Barrier Coatings

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Volcanic Ash Degradation on Thermal Barrier Coatings ( volcanic-ash-degradation-thermal-barrier-coatings )

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CHAPTER 4 VOLCANIC ASH AND ITS PENETRATION MECHNISMS IN TBCS 4.2.2 Penetration Type of Degradation Mechanism on TBCs By reducing the amount of volcanic ash (3 mg/cm2) introduced to the YSZ top surface, the mechanisms of volcanic ash penetration could be revealed clearly. Figure 4.13 shows that the TBC columns were penetrated by volcanic ash when heated to 1250 °C for 15 minutes. In addition, volcanic ash also melted and got evenly covered on top of the YSZ columnar tips. Through the EDX mapping shown in Figure 4.14, it can be observed that the penetration of molten volcanic ash went as far as 40 μm already, although there was no severe crack or observed spallation. Figure 4.13 TBC sample under the heat treatment at 1250 °C for 15 minutes with volcanic ash AB Figure 4.14 EDX mapping of (A) Zirconium and (B) Silicon for the TBC sample under the heat treatment at 1250 °C for 15 minutes with volcanic ash Page 58

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