AVS 65th International Symposium & Exhibition
    Advanced Surface Engineering Division Tuesday Sessions
       Session SE-TuP

Paper SE-TuP6
Tribological Systems Solutions for Gas Turbine Engines

Tuesday, October 23, 2018, 6:30 pm, Room Hall B

Session: Advanced Surface Engineering Division Poster Session
Presenter: Pantcho Stoyanov, Pratt & Whitney
Correspondent: Click to Email
The advancement of durable gas turbine engine components depends heavily on the development of high-performance materials, which can withstand extreme environmental and contact conditions (e.g. large temperature ranges, high contact pressures, and continuous bombardment of abrasive particles, all of which degrade the physical properties). In particular, due to the large number of complex contacting and moving mechanical assemblies in the engine, the lifetime of certain structures is limited by the tribological performance of the employed materials and coatings. This talk will provide an overview of tribological solutions employed in several sections of gas turbine engines. After a general review of aircraft engine tribology, the talk will focus on coatings used for clearance control (i.e. abradable air seals) as well as tribological materials used to minimize fretting type of wear. More specifically, a study will be presented on the influence of self-lubricating hexagonal boron nitride (hBN) on the erosion and abradability of Ni-based abradable coatings. Subsequently, a series of studies on the friction and wear behavior of Ni-based and Co-based superalloys at elevated temperatures will be presented. Emphasis will be placed on the correlation between the third body formation process (e.g. oxide layer formation, transferfilms) and the tribological behavior of the superalloys. This talk will conclude with the future strategies of tribological coating solutions in Pratt & Whitney’s PurePower® PW1000G family of engines.