Advantages of Sol-Gel Technique:

1. Can produce thin bond-coating to provide excellent adhesion between the metallic substrate and the top coat.

2. Can produce thick coating to provide corrosion protection performance.

3. Can easily shape materials into complex geometries in a gel state.

4. Can produce high purity products because the organo -metallic precursor of the desired ceramic oxides can be mixed, dissolved in a specified solvent and hydrolyzed into a sol, and subsequently a gel, the composition can be highly controllable.

5. Can have low temperature sintering capability, usually 200-600°C.

6. Can provide a simple, economic and effective method to produce high quality coatings.