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CHAPTER 3 RESEARCH PROPOSAL protective coatings on the surface of the YSZ top coat to prevent volcanic ash in contact with the YSZ top coat using two different ideas. The first idea is using a dense YSZ overlay to block the columnar gaps and the porous structure of the top coat to protect the top coat structure from CMAS attack. Also, this layer is treated as a sacrificial layer, which means CMAS will react with the dense YSZ overlay before reacting with the YSZ top coat. The second Idea is much related to the property of volcanic ash. Because of its complicated composition, it is nearly impossible to find a ceramic material, which does not react with volcanic. Thus, the mechanism of the second type of protective coating will be based on protective overlay materials which react with volcanic ash, but result in reaction products with higher melting temperatures capable of staying in the solid phase when the engine is in operation. For the material of the second type, coating an Al2O3 film can restrain CMAS infiltration into the YSZ top coat effectively, according to the literature [49]. 3.2 ExperimentalProcedure The research procedure can be separated into six different parts: 1) characterization of the volcanic ash, 2) study of the CMAS-induced TBC degradation by the use of volcanic ash, 3) penetration test of volcanic ash in different materials, 4) differential thermal analysis (DTA) analysis for the mixture of volcanic ash and candidate materials, 5) X-ray diffraction (XRD) analysis of Page 42PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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