Effect of test parameters in the exposure of Ca–Mg–Al–silicate on yttria stabilized zirconia

Abstract

Jet engine components need protective coatings to function against both high-temperature and environmental effects. Ingested calcium-magnesiumaluminosilicates (CMAS) dust particulates are extremely detrimental to the life of the coatings. However, many methods exist to investigate the infiltration of CMAS into these coatings with each method exploring a different aspect of the degradation process. To probe the overlap in these methods, this study focuses on the effect of grain size, areal density, and aspect ratio on the infiltration of CMAS into yttria stabilized zirconia. The infiltration depths ranged from 6 up to 85 µm depending on the test conditions.

Solid particle erosion in ceramic matrix composites and environmental barrier coatings: A perspective

“…79 Current techniques for evaluating CMAS corrosion of EBCs have been focused on static loading where the CMAS is applied to the surface at ambient temperature and then melted/reacted in a furnace. 80 In application, CMAS deposition, and correspondingly, SPE and the synergistic effects between the two modes (erosion-corrosion) are dynamic in nature. In fact, a Federal Aviation Administration (FAA) Advisory Circular 81 emphasis the need for dynamic testing as traditional, independent static tests may not adequately replicate the engine environment.…”

“…Current techniques for evaluating CMAS corrosion of EBCs have been focused on static loading where the CMAS is applied to the surface at ambient temperature and then melted/reacted in a furnace 80 . In application, CMAS deposition, and correspondingly, SPE and the synergistic effects between the two modes (erosion‐corrosion) are dynamic in nature.…”