Protection of coated superalloys from erosion in turbomachinery and other systems exposed to particulate flows

Abstract

The design and development of high performance turbomachinery operating in an ambient with solid particles require a thorough knowledge of the fundamental phenomenon associated with particulate flows. This paper describes the overview of jet engines performance deterioration and retention. The ingestion of solid particles over period of time, will reduce the efficiency of the propulsion system, causing increased fuel consumption and thrust decrease. High pressure compressor and turbine design improvements are now developing and verifying experimentally different new ceramic coatings on superalloys such as INCO 718, Waspaloy and on SS410, subjected to gas particulate flows at high temperatures. The investigated coatings are produced by plasma spray, detonation guns, chemical vapor deposition (CVD), physical vapor deposition (PVD), and other methods. Experimental studies were conducted at the University of Cincinnati high temperature erosion wind tunnel to investigate the erosion behavior of coatings exposed to different types of solid particles. Some of the following coatings were evaluated: rhodium platinum aluminized, SDG-2207 (super D-gun product), CVD coatings, including TiC, TiN, Al 2O 3, and PVD coatings. The erosive wear of the samples was studied experimentally by exposing them to particle laden flow at velocities from 180 to 305 m s −1, temperatures from ambient to 815°C and impingement angles from 15° to 90°.