Experiences in Seeking Stabilizers for Zirconia Having Hot Corrosion-Resistance and High Temperature Tetragonal (t') Stability.

Abstract

This report summarizes the results of a research effort aimed at identifying hot corrosion-resistant stabilizers for zirconia (ZrO2) which could be used in zirconia-based thermal barrier coatings (TBCs) for engines operating on marine fuel under sea-going conditions. Among the oxides investigated were TiO2, CeO2, Y2O3, MgO, Sc2O3, In2O3, and SnO2. A brief overview of the hot corrosion of zirconia TBCs is given to illustrate the rationale used in evaluating the hot corrosion performance of the candidate oxides. The most promising stabilizer found for hot corrosion resistance was Sc2O3, or perhaps mixtures of Sc2O3 and small amounts of Y2O3. It was also discovered that Sc2Os, Y2O3- stabilized ZrO2 (SYSZ), of approx. 7 mol% of total stabilizer of which 5-20% is Y2O3, shows improved 1400 deg C stability of the tetragonal (t') phase as compared to present-day Y2O3-stabilized ZrO2 TBC compositions. This new material may have potential for TBC use in future high temperature, high efficiency gas turbine engines.

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Document Details

Document Type
Technical Report
Publication Date
Apr 16, 1996
Accession Number
ADA307697

Entities

People

  • Robert L. Jones

Organizations

  • United States Naval Research Laboratory

Tags

DTIC Thesaurus Topics

  • Barrier Coatings
  • Corrosion
  • Corrosion Resistance
  • Engines
  • Gas Turbines
  • High Temperature
  • Materials
  • Resistance
  • Turbine Components
  • Turbines

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Surface Engineering/Surface Coating Technology.