Fundamental Structure-Property Relationships for High-Temperature Ceramic Composites

Abstract

This research program focused on studying interface structure and thermal compatibility stresses in several directionally solidified eutectic ceramic materials, which are candidates for high-temperature and ultra-high temperature structural materials in aerospace applications. Under this award we specifically investigated the alumina-zirconia and lanthanum hexaboride-zirconium diboride eutectic systems. High-resolution transmission electron microscopy was utilized to understand interfacial structures in these materials and x-ray diffraction was utilized to measure thermal residual stresses. A major conclusion of the research program was that thermal stresses are the dominant factor that leads to the high fracture toughness in the lanthanum hexaboride-zirconium diboride eutectic systems. The research program supported two Ph.D. students and two undergraduate students.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 2005
Accession Number
ADA441413

Entities

People

  • Elizabeth C Dickey

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Ceramic Matrix Composites
  • Composite Materials
  • Diffraction
  • Electron Diffraction
  • Electron Microscopy
  • Electrons
  • Engineered Materials
  • Materials
  • Materials Science
  • Measurement
  • Microscopy
  • Residual Stress
  • Residuals
  • Stresses
  • Transmission Electron Microscopy
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.
  • Research Science/Academic Research

Technology Areas

  • Microelectronics
  • Space