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CHAPTER 1 INTRODUCTION the operating temperature of engine turbine, there is a degradation mechanism of hot section turbine materials, known as the calcium-magnesium-alumino-silicates (CMAS) degradation. Molten CMAS attacks on the YSZ top coat layer is becoming more apparent and requires the attention of materials scientists. When the engine is in operation, airborne ashes, dusts and debris are ingested into the engine, they melt, and form CMAS before being deposited on the surface of hot area of turbine. Molten CMAS also penetrates into the YSZ top coat, and shortens the lifetime of TBCs [1] which degradation mechanism will be explained in the next chapter. Since the eruption of Eyjafjallajokull volcano in Iceland on April 14th, 2010 and caused interruption of flights due to concern about the possible damage from volcanic ash during aeroplane flying, the interaction between volcanic ash and thermal barrier coatings has been paid attention by materials scientists. The reaction between volcanic ash and TBCs could cause failure of TBCs, and leading to risk of aero engine. The main components of volcanic ash are Ca, Mg, Al, Si and Fe contained oxides, which have similarity to the CMAS generated from atmospheric dust during high temperature combustion in aero engines. Both CMAS and volcanic ash could react with TBCs and cause failure of TBCs, which induced degradations of hot section in engine components. The degradation mechanisms of volcanic ash are very similar to CMAS, which also penetrates into the YSZ columnar gaps and pores, and lead the top coat sintering. In this research, volcanic ash coming from Sakurajima volcano, Japan is introduced into the research. Unlike artificial CMAS made from the mixture of Page 16PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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