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CHAPTER 6 FRABRICATION OF PROTECTIVE COATINGS BY SOL-GEL BASED METHOD on stainless steel plates with the surface polished to #800 grit finish. For dip coating, the precursor was prepared 30 minutes prior to the coating procedure, and was used to dip coat samples for 1 and 5 times with withdraw speed 0.03 cm/min. Figure 6.2 and Figure 6.3 show the morphology of YSZ protective coating made from 1 and 5 times sol-gel dip coating. Figure 6.2 is the cross-sectional and surface image of YSZ coating made from 1 time sol-gel dip coating, a 2 μm thick overlay with cracks was observed on the stainless steel substrate. On the other hand, the cross-sectional and surface images of YSZ coating made by dip coat of 5 times are shown in Figure 6.3. After 5 times dip coating, YSZ had larger thickness of about 5 μm but more cracks were found on its surface. Regarding sol-gel spray coating, there was only one sample made by air gun spray coating for 6 times. The reason why 1 time spray coating sample was not prepared was because the coverage of precursor on the stainless steel substrate was really random by spray coating for only one time. However, with more spraying time, it was believed that the overlay would be much flatter and the distribution of precursor would be more even. Figure 6.4 shows the coating morphology made by spray coating for 6 times. A 6 μm thick coating was observed with comparatively less crack. From the preliminary observation, it is confirmed that the coatings made by spray coating would offer better surface finish, which is much more suitable for fabricating protective coatings. Page 80PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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