Bi-Layer Thermal Barrier Coatings Based on the Yttrium-Tantalate Zirconia System.
Abstract
In the current grant period, yttrium tantalate (YTaO4) materials alloyed with zirconia have been found to exhibit many of the same attributes, but at higher temperatures, that make yttriastabilized zirconia (YSZ) the material of choice for current state-of-the-art thermal barrier coatings. Based on our discoveries of the promising materials properties, a research program is proposed to assess the viability of coatings made from compositions in the YTaO4-ZrO2 material system for the next generation, higher temperature capability Navy gas turbine engines. The emphasis will be on assessing the thermal cyclic life of coatings deposited on superalloy substrates, the high-temperature stability of the coatings (including in the presence of CMAS), and compatibility with thermally grown oxides as well as on the damage mechanisms leading to failure. The results of these investigations will be used to identify and optimize compositions within the single and two-phase YTaO4-ZrO2 pseudo-binary compositional fields.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 12, 2016
- Source ID
- N000141512715
Entities
People
- David B. Clarke
Organizations
- Office of Naval Research
- President and Fellows of Harvard College
- United States Navy