Properties of al2o3-% 13tio2 and cr2o3-% 5sio2-% 3tio2 ceramic coated materials with plasma and flame spraying technique

In this study, the solution of an industrial problem is aimed. Some parts of textile industry machines to wear in this study arc galet rollers. These parts have been covered by two ceramic coatings to improve wear life limit. ln the studies in laboratory conditions, flame spray and plasma spray techniques have been used. By using these techniques, twO types of ceramic coatings (Al203-%l3TiO2 or Cr203-%5SiO2-%3 TiO2) with or without NiAl bonding coat have been subjected to bonding strength, wecar and microhardness experiments. In addition, ceramic coatings arc evaluated by X-ray, SEM (Scanning Electron Microscope) microstructure and microanalysis examinations. The most suitable coating technique and ceramic coating have been determined in laboratory conditions for these textile machine parts exposed to wear and working in service conditions. The optimum conditions; by using plasma spraying techniques, NiAl boning coat (approximately coating thickness is 150 nm) plus Cr203-%5SiO2-%3 TiO2 ceramic coating (approximately optimum ceramic coating is 200 nm) are obtained. Quite profitable results have been obtained from the ceramic coatings produced in optimum conditions. By introducing ceramic coating techniques to the textile industry, surfaces exposed to wear arc coated. By employing these techniques, metallic material erosion is reduced, working speed is not interrupted and the number of imported parts are reduced and this helps the economy.