Benefits of coating applications - A case study

Abstract

During service, gas turbine blades and vanes are exposed to thermal stresses and to oxidation and hot corrosion from the hot combustion gas. Therefore, the coating process is a good alternative to protect the turbine. In the present work is studied the benefits of the application of two coating layers to enhance the corrosion and oxidation resistance of niquel base blades and vanes. The specimens were first cleaned and then the coatings were applied through a pre-programmed furnace. Photomicrographies of the specimens were taken, showing the steps of the coatings and the results of the oxidation tests. There was no evidence of damage and the oxidation characteristics of the two coatings were similar to one. The proposal to use multilayer VPA coatings increases the average of the coating deposited and as a result the life of the substrates. © 2009 by the American Institute of Aeronautics and Astronautics, Inc.