Study of Advanced Thermal Barrier Coatings and Calcia-Magnesia-Alumino-Silicate (CMAS) Interactions
Abstract
The infiltration and adhesion of molten particulates is a significant problem for gas-turbine engines (GTEs) operating in particle-laden environments. The resultant glassy calcia-magnesia-alumino-silicate coating on hot-section components can lead to early GTE failure and decreased rotorcraft flight time. Between 2000 and 2013, the US military lost 26 rotorcraft, costing $533 million, due to operating in brownout conditions. A quantitative understanding of the chemical reaction kinetics between ingested particulates and thermal barrier coatings (TBCs) is key to developing effective mitigation strategies that limit Army exposure to this environmental risk. To this end, we have mixed TBC powders with a synthetic sand, AFRL-02, to study the reaction kinetics. After analysis with a scanning electron microscope (SEM), equipped with an energy-dispersive X-ray spectrometer (EDS) for elemental analysis, the powders were melted at 1,300 C for 4 h. The resultant glass was subsequently imaged/analyzed with SEM-EDS. In addition, X-ray diffraction and differential scanning calorimetry (up to 1,400 C) data are also being collected on the powder mixtures to aid in identifying new phases and reactive species being formed. The information will be used to develop new TBCs with sandphobic qualities for increased reliability/durability of Army vertical-takeoff-and-landing engines.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 2020
- Accession Number
- AD1109556
Entities
People
- Alex Berendt
- Anindya Ghoshal
- Michael Walock
- Muthuvel Murugan
- Rick Reidy
Organizations
- United States Army Combat Capabilities Development Command