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CHAPTER 6 FRABRICATION OF PROTECTIVE COATINGS BY SOL-GEL BASED METHOD the solution and yet, there was no obvious change in the gelation time, especially for producing larger volume of precursor needed for coatings deposition. After evaluating different parameters, trial 9 was selected as the precursor for the fabrication of alumina protective coatings. Table 6.2 Parameters of alumina precursors trial1 trial2 trial3 trial4 trial5 trial6 trial7 trial8 trial9 trial10 trial11 6.2.2 AlCl3·6H2O (g) 0.724 0.724 0.724 0.740 0.740 0.740 0.740 2.960 2.960 5.794 5.794 H2O (mL) 5 5 5 5 5 5 5 20 20 40 40 Propylene Oxide (mL) 1.29 1.07 0.86 3.01 4.52 6.02 9.04 7.86 11.00 21.00 35.00 Gelation time >12hrs >12hrs >12hrs 160mins~ 5hrs 160mins~ 5hrs 160mins~ 5hrs 160mins 2hr~24hrs 2hr~24hr >12hrs >12hrs Characterization of Alumina Coatings For the alumina protective coatings fabrication, alumina has only been fabricated by spray coating. As shown in Figure 6.5, 5 μm thick alumina coating with little crack was observed on the substrate after 5 times spraying. Table 6.3 shows the result of XRF analysis. It can be seen that the concentration ratio of alumina composition was really close to the ideal stoichiometric ratio. Page 83PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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