Figure 8. Micrograph of the leading edge of a BC21 + PVD ceramic coated blade showing adjacent spalled (a) and non-spalled (b) areas. No evidence of hot corrosion attack is present at either location.

Bt mmm

100 pm

Figure 12 Microstructure of Plasma Figure 13 Microstructure of Plasma sprayed YSZ with NiCrAlY bond coat. sprayed CSZ with BC22 bond coat.

Figure 14. Microstructure of i \

spattered YSZ with plasma sprayed and polished PS6MY bond coat. L

Figure 16. SEM micrograph of the surface of a PVD CSZ coated pin specimen, corrosion tested for 30 hours; the crystals contain cerium and vanadium, presumably cerium vanadates.
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