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research-article

Erosion in Gas-Turbine Grade Ceramic Matrix Composites (CMCs)

[+] Author and Article Information
Nesredin Kedir

Naval Air Systems Command, Patuxent River, MD 20670, USA
nesredinfkedir@gmail.com

Cajer Gong

Naval Air Systems Command, Patuxent River, MD 20670, USA
cajer.gong@navy.mil

Luis Sanchez

Naval Air Systems Command, Patuxent River, MD 20670, USA
luis.j.sanchez@navy.mil

Mike Presby

Naval Air Systems Command, Patuxent River, MD 20670, USA
mjp80@zips.uakron.edu

Sean Kane

Naval Air Systems Command, Patuxent River, MD 20670, USA
sean.t.kane@navy.mil

Calvin Faucett

Naval Air Systems Command, Patuxent River, MD 20670, USA
david.faucett@navy.mil

Sung R Choi

Naval Air Systems Command, Patuxent River, MD 20670, USA
sung.choi1@navy.mil

1Corresponding author.

ASME doi:10.1115/1.4040848 History: Received June 26, 2018; Revised July 03, 2018

Abstract

Erosion behavior of a large number of gas-turbine grade ceramic matrix composites (CMCs) was assessed using fine to medium grain garnet erodents at velocities of 200 and 300 m/s at ambient temperature. The CMCs used in the current work were comprised of nine different SiC/SiCs, one SiC/C, one C/SiC, one SiC/MAS, and one oxide/oxide. Erosion damage was quantified with respect to erosion rate and the damage morphology was assessed via SEM and optical microscopy in conjunction with 3-D image mapping. The CMCs response to erosion appeared to be very complicated due to their architectural complexity, multiple material constituents, and presence of pores. Effects of architecture, material constituents, density, matrix hardness, and elastic modulus of the CMCs were taken into account and correlated to overall erosion behavior. The erosion of monolithic ceramics such as silicon carbide and silicon nitrides was also examined to gain a better understanding of the governing damage mechanisms for the CMC material systems used in this work.

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