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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3.2 Experimental Procedure..............................................................42 Chapter 4 Volcanic Ash and Its Penetration Mechanisms in TBCs.............................................................................................. 49 4.1 Study of Volcanic Ash..................................................................49 4.1.1 Structure and Surface Morphology.................................................. 49 4.1.2 Melting Point of Volcanic Ash .......................................................... 51 4.2 Mechanisms of volcanic ash attack ...........................................54 4.2.1 Delamination Type of Degradation Mechanism on TBCs ................ 55 4.2.2 Penetration Type of Degradation Mechanism on TBCs................... 58 4.3 Investigation of the Reaction between Volcanic Ash and YSZ by DTA and XRD Analysis ....................................................................62 Chapter 5 Characterization of Protective Coating Materials ..... 69 5.1 Reaction and Permeability of Volcanic Ash in YSZ and Alumina Plates .....................................................................................................69 5.2 Investigation of the reaction between volcanic ash and alumina by DTA and XRD....................................................................................71 Chapter 6 Fabrication of Protective Coatings by Sol-Gel Based Method...... .................................................................................... 76 6.1 YSZ protective coatings ..............................................................77 6.1.1 Precursor for YSZ coatings ............................................................. 77 6.1.2 Characterization of YSZ coatings.................................................... 79 6.2 Alumina protective coatings .......................................................82 6.2.1 Precursor for alumina coatings........................................................ 82 6.2.2 Characterization of Alumina Coatings ............................................. 83 6.3 Preliminary Fabrication and Characterization of YSZ and Alumina Protective Coatings on TBC Top Coats...............................85 LIST OF CONTENTS Page 2

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