Abstract
Mostly common issue in power generation plant is recognised as disintegration or degradation of steels used in boilers in recent days and main causes for this type of failure are erosion, low temperature hot corrosion, high temperature hot corrosion etc. Defensive or protective coatings have been found effective to solve this problem and showed good results. Thermally sprayed coatings are widely used in various industries in boiler components such as boiler tubes, super-heater tubes, boiler walls and Induced Draft (I.D.) fans in coal fired thermal power plants, automobile system etc. The coatings produced by LVOF method show good adherence to the substrate with lower oxidation rate. In present work LVOF Sprayed Al2 O3-13%TiO2 as well as Al2 O3-40%TiO2 Coatings were deposited on ASTM316 Boiler Steel. The characterization of coating was done by SEM, X-Ray diffraction for checking the phases formed on the surface, and elemental examination of the cross-section. The surface morphology of the above said both the coatings was examined with the help of Scanning Electron Microscopy with EDAX attachment, XRD examination and the X-ray mapping. The research investigation shows that the selected feedstock and coating technique have produced the successful coatings perfectly.
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