Ultra High Temperature Ceramic-Ceramic Composites

Abstract

The focus of this project is an understanding of the material stability and environmental degradation of potential diboride reinforced oxide matrix composites exposed to oxidizing conditions at ultrahigh temperature in the range of 1650 - 2100C. Particulate composites of 5w% ZrB2, in YS-ZrO2, Y203 and A1203, as well as of Sw% TiB2 in CaZrO3, have been prepared. by vacuum hot pressing. Specimens were tested in vacuum at 1600c, by induction heating in air at 1400 to 1850 C and oxyacetylene flames at 1650 to 2050C, in order to evaluate the chemical compatibility between the diboride/oxide combinations, as well as the effectiveness of the oxides as diffusion barriers for the oxidation of the diborides. Results indicate that, although the oxides and diborides are chemically compatible at these temperatures, the oxides are not effective in preventing oxidation of the diborides.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1989
Accession Number
ADA230593

Entities

People

  • Krishna M. Vedula

Organizations

  • Case Western Reserve University

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Composite Materials
  • Crystal Structure
  • Diffraction
  • Electron Microscopes
  • Electron Microscopy
  • Heat Treatment
  • High Temperature
  • Materials
  • Materials Laboratories
  • Melting Point
  • Microscopy
  • Oxidation Resistance
  • Phase Diagrams
  • Sandwich Composites
  • Scanning Electron Microscopy
  • Vapor Pressure
  • X Rays

Fields of Study

  • Materials science

Readers

  • Manufacturing Engineering.
  • Powder metallurgy of Titanium alloys.
  • Thin Film Deposition Science.