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CHAPTER 6 FRABRICATION OF PROTECTIVE COATINGS BY SOL-GEL BASED METHOD the precursor. The second phenomenon was observed by comparing trial 2 and trial 6. The results showed that the gelation time was not strongly related to the ratio of precursor composition. Although trial 2 and trial 6 had the same molar ratio, gelation time was different by 12 times. The reason behind this is still not fully confirmed. After many trials, the precursor trial 11 was determined to be the best solution for dip coating and spray coating. Table 6.1 Parameters of YSZ precursors ZrCl4 (g) YCl3·6H2O (g) H2O (mL) Propylene Oxide (mL) Gelation time trial 1 trial 2 trial 3 trial 4 trial 5 trial 6 trial 7 trial 8 trial 9 trial 10 trial 11 6.1.2 0.583 0.152 5 0.64 0.583 0.152 5 1.07 1.165 0.303 10 3.61 1.165 0.304 10 3.85 1.165 0.304 10 4.09 4.661 1.214 40 8.56 4.660 1.214 40 3.50 4.661 1.215 40 5.00 4.661 1.215 40 6.50 4.661 1.214 40 7.50 4.661 1.215 40 7.00 Characterization of YSZ coatings >24hr 35mins <5mins <5mins <5mins 3mins >12hrs >12hrs >12hrs 7mins 95mins After the composition of the best precursor had been determined, the next step was focused on the fabrication of YSZ protective layer by sol-gel dip coating and spray coating. Before coating on the TBC sample directly, YSZ was coated Page 79PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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