Molten Silicate Reactivity with Environmental Barrier Coating Materials for Gas Turbine Engine ApplicationsRare earth (RE) disilicates are utilized in environmental barrier coatings (EBCs) to protect SiC-based ceramic matrix composites (CMCs) from destructive reactions with water vapor and other combustion species. These coating materials, however, degrade when exposed to molten silicate deposits primarily composed of calcium-magnesium aluminosilicates (CMAS). Coating materials are exposed to CMAS by engine ingestion of dust particulates from terrestrial sources during operation. Due to continual increases in engine operating temperature, it is important to understand the high temperature thermochemical mechanisms that drive corrosion of these materials. This work focuses on characterizing reaction products between disilicates and CMAS and optimizing coating chemistries to mitigate damage.
Document ID
20190029593
Acquisition Source
Glenn Research Center
Document Type
Poster
Authors
Stokes, Jamesa L. (Pennsylvania State Univ. University Park, PA, United States)
Harder, Bryan J. (NASA Glenn Research Center Cleveland, OH, United States)
Wiesner, Valerie L. (NASA Glenn Research Center Cleveland, OH, United States)
Wolfe, Douglas E. (Pennsylvania State Univ. University Park, PA, United States)
Date Acquired
August 26, 2019
Publication Date
July 21, 2019
Subject Category
Chemistry And Materials (General)
Report/Patent Number
GRC-E-DAA-TN71018
Meeting Information
Meeting: Gordon Research Conference on High Temperature Corrosion