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CHAPTER 3 RESEARCH PROPOSAL Dip coating was made by dip coater, after substrate immersed into the sol for 1 minute, the machine pulled the sample up with a speed 0.03 cm/sec. For spray coating, it is made by air gun spraying with an emitting pressure 0.4 MPa and spraying time 5 seconds. After each time of dipping or spraying, 75 °C of heat treatment for 15 minutes was proceeded. The amount of the materials produced for coatings are controlled by the dwell time and pull up speed for dip coatings, and spraying time and emitting pressure for the spray coating. This experiment can be separated as two parts, the first half focused on parameters defining (i.e. gelation time of sols, the thickness measurement for each time coating and surface morphologies of protective coatings made by dip coatings and spray coatings) and stainless steel was chosen as the substrate. The better sols for sol-gel coatings and the better coating technique can be confirmed after all parameters were defined. In second half, protective coating would be coated on the top of TBCs using better sols and coating technique. In order to get dense coatings, one-hour thermal heat treatment was conducted after the last 15 minutes heating. Page 48PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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