Self-Healing YSZ-Al2O3-(SiC, Nb2O5, Ta2O5) Thermal Barrier Coatings in a Corrosive Calcia-Magnesia-Alumina-Silicates Environment
Abstract
Damage and open porosity are detrimental to the durability of the thermal barrier coatings (TBCs) used to protect the metallic components of gas turbine engines. These flaws lead to decreased thermal conductivity and increased oxygen diffusion, which result in uncontrollable growth of the thermally grown oxide, a common cause of TBC failure. To combat these defects, a self-healing additive can be distributed into the TBC matrix to provide as-needed closure of damage and pores. Another cause of TBC failure is the adherence and infiltration of calciamagnesiaaluminasilicates (CMAS), which occurs in aircraft operating in particle-laden environments. This research is aimed to collect a fundamental understanding of the CMAS interaction with the proposed YSZAl2O3(SiC, Nb2O5, Ta2O5) self-healing systems. These systems were exposed to high thermal-gradient experimentation and imaged using scanning electron microscopy and energy dispersion spectroscopy to examine CMASs effects on the healing products and the systems resistance to CMAS attacks.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 2020
- Accession Number
- AD1111204
Entities
People
- Anindya Ghoshal
- Bailey Ashmore
- Michael J. Walock
- Muthuvel Murugan
Organizations
- United States Army Research Laboratory