Ceramic Matrix Composite Materials for Engine Exhaust Systems on Next Generation Vertical Lift Vehicles

[+] Author and Article Information
Michael J. Walock

US Army Research Laboratory, Aberdeen Proving Ground, MD

Vann Heng

The Boeing Company, Huntington Beach, CA

Andy Nieto

US Army Research Laboratory, Aberdeen Proving Ground, MD

Anindya Ghoshal

US Army Research Laboratory, Aberdeen Proving Ground, MD

Muthuvel Murugan

US Army Research Laboratory, Aberdeen Proving Ground, MD

Daniel Dreimeyer

The Boeing Company, St. Louis, MO

1Corresponding author.

ASME doi:10.1115/1.4040011 History: Received March 18, 2018; Revised April 11, 2018


Future gas turbine engines will operate at significantly higher temperatures (~ 1800 °C) than current engines (~ 1400 °C) for improved efficiency and power density. As a result, the current set of metallic components (titanium-based and nickel-based superalloys) will be replaced with ceramics and ceramic matrix composites (CMCs). These materials can survive the higher operating temperatures of future engines at a significant weight savings over the current metallic components, i.e. advanced ceramic components will facilitate more powerful engines. While oxide-based CMCs may not be suitable candidates for hot-section components, they may be suitable for structural and/or exhaust components. However, a more thorough understanding of performance under relevant environment of these materials is needed. To this end, this work investigates the high temperature durability of a family of oxide-oxide CMCs under an engine relevant environment. Flat oxide-oxide CMC panels were cyclically exposed to temperatures up to 1150 °C, within 240 m/s (~0.3 M) gas flows and hot sand impingement. Front and backside surface temperatures were monitored by a single-wavelength pyrometer and thermocouple, respectively. In addition, an infrared camera was used to evaluate the damage evolution of the samples during testing. Flash thermography nondestructive evaluation was used to elucidate defects present before and after thermal exposure.

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