AN EROSION RESISTANCE COATING FOR HYDROTURBINE COMPONENTS AND METHOD OF COATING

摘要

The present invention relates to the making of a polyurethane coating with titanium carbide powder added to it and the method of coating. Polyurethane is mixed with carbide based powder to form an erosion resistant coating for hydroturbine components. Polyurethane is made from poly-isocyante and polyol. Poly-isocyante and Polyol combined with titanium carbide powder is mixed in a mixing chamber of a coating equipment which is then collected in the spraying gun for coating the hydroturbine surface. Before the coating a organic based primer is applied in the surface for better adhesion. Pipelines of the coating equipment for delivery of the coating is cleaned with Methyl Ethyl Ketone. The surface to be coated is first subjected to roughening by grit blasting with 12-26 alumina powder grit. The coat thickness is maintained upto 2000-2500 microns and the surface finish is maintained at Ra 1.15 microns.