Accession Number:

AD1111204

Title:

Self-Healing YSZ-Al2O3-(SiC, Nb2O5, Ta2O5) Thermal Barrier Coatings in a Corrosive Calcia-Magnesia-Alumina-Silicates Environment

Descriptive Note:

[Technical Report, Technical Report]

Corporate Author:

CCDC Army Research Laboratory

Report Date:

2020-09-01

Pagination or Media Count:

21

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 YSZAl2O3SiC, 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.

Descriptors:

Subject Categories:

  • Coatings, Colorants and Finishes
  • Jet and Gas Turbine Engines

Distribution Statement:

[A, Approved For Public Release]