In Situ Composites in the Aluminum Nitride-Alumina System.

Abstract

An attempt was made to produce in situ composites in an aluminum nitride-alumina system via pressureless reaction sintering. Different aluminum nitride-alumina compositions were prepared and fired at temperatures between 1900 deg C and 2200 deg C. Phase compositions were determined by x-ray diffraction, and microstructure development was evaluated by scanning electron microscopy. Elongated grains in an equiaxed matrix were achieved. However, the expected improvement in mechanical properties was offset by excessive grain growth and porosity. The high mobility of grain boundaries causes abnormal growth and pore entrapment without full densification. Suggestions for further work are offered to remedy the problems. jg

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1995
Accession Number
ADA293776

Entities

People

  • Ender Savron

Tags

Communities of Interest

  • Advanced Electronics
  • Biomedical
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aluminum Nitrides
  • Body Weight
  • Ceramic Materials
  • Chemistry
  • Composite Materials
  • Electron Microscopy
  • Grain Boundaries
  • Grain Growth
  • Materials
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Materials Testing
  • Mechanical Properties
  • Microscopy
  • Phase Diagrams
  • X Rays

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.
  • Systems Analysis and Design

Technology Areas

  • Microelectronics