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CHAPTER 2 LITERATURE REVIEW attack columnar tips, and formed a product overlay on the top. Because the melting temperature of the reaction product is much higher than the engine operating temperature, it stays in the solid phase when the engine is in operation and forms a layer in the interface of CMAS/Gd2Zr2O7. The thick layer of reaction products can effectively protect the top coat surface by blocking the pathway of CMAS penetration and provide the longer lifetime of top coat. Actually, not only gadolinium zirconate provides good resistance against CMAS, other rare earth zirconates also provide similar protection mechanism [41,61]. Figure 2.12 Mechanism of CMAS/Gd2Zr2O7 interaction. (a) In early stage, CMAS/Gd2Zr2O7 react in TBCs columnar gaps, (b) columnar gaps are filled up with reaction products and the columnar tips just receive small attack from CMAS, (c) columnar tips is severely attacked by CMAS, (d) additional crystalline forms during cooling [60] Page 40PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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