Processing and Deposition of Nanocrystalline Oxide Composites for Thermal Barrier Coatings.

Abstract

This report describes the synthesis, thermal stability and coating of nanocrystalline oxide composites for thermal barrier coating applications. The composites consisted of alumina-zirconia and alumina-yittria stabilized zirconia. The effect of alumina and yittria content on zirconia phase stability was examined. It was found that alumina-zirconia composites underwent phase transformation upon heat treatment at 950-1100 C. A small amount of yttria additive (1%) prevented zirconia phase transformation. Addition of alumina to the yttria stabilized zirconia system suppressed grain growth below 1100 C. The yttria stabilized zirconia powders were successfully coated onto Ni substrates using electrophoretic deposition. The composition of the coating solution was systematically varied to attain the optimal suspension for coating applications.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Dec 31, 1999
Accession Number
ADA371811

Entities

People

  • Jackie Y. Ying
  • Justin T. Mccue

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Barrier Coatings
  • Chemical Engineering
  • Coatings
  • Composite Materials
  • Electrophoretic Deposition
  • Failure Mode And Effect Analysis
  • Grain Growth
  • Grain Size
  • Heat Energy
  • Heat Treatment
  • Materials Processing
  • Nanocomposites
  • Nitric Acid
  • Phase Transformations
  • Substrates
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.
  • Surface Engineering/Surface Coating Technology.