Advanced Oxide Material Systems for 1650 Deg. C Thermal/Environmental Barrier Coating Applications

Abstract

Advanced thermal and environmental barrier coatings (TEBCs) are being developed for low- emission SiC/SiC ceramic matrix composite (CMC) combustor and vane applications to extend the CMC liner and vane temperature capability to 1650 degrees C (3000 degrees F) in oxidizing and water-vapor-containing combustion environments. The advanced 1650 degrees C TEBC system is required to have a better high temperature stability, lower thermal conductivity, and more resistance to sintering and thermal stress than current coating systems under engine high-heat-flux and severe thermal cycling conditions. In this report, the thermal conductivity and water vapor stability of selected candidate hafnia-, pyrochlore-, and magnetoplumbite-based TEBC materials are evaluated. The effects of dopants on the materials' properties are also discussed. The test results have been used to downselect the TEBC materials and help demonstrate the feasibility of advanced 1650 degrees C coatings with long-term thermal cycling durability.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2004
Accession Number
ADA433417

Entities

People

  • Dennis S. Fox
  • Dongming Zhu
  • Narottam P. Bansal
  • Robert A. Miller

Organizations

  • National Aeronautics and Space Administration

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Barrier Coatings
  • Body Weight
  • Ceramic Matrix Composites
  • Coatings
  • Combustion
  • Composite Materials
  • Engines
  • Environment
  • Heat Flux
  • Heat Transfer
  • High Temperature
  • Materials
  • Military Research
  • Resistance
  • Thermal Conductivity
  • Thermal Stresses
  • Turbines

Fields of Study

  • Materials science

Readers

  • Educational Psychology
  • Internal Combustion Engine (ICE) Technology.
  • Thermal Physics or Thermal Science.