Ultrafine Microstructure Composites Prepared by Chemical Vapor Deposition

Abstract

It is our goal to develop an analytical model which predicts the experimental conditions which permit the preparation of ultrafine microstructure ceramic composites by chemical vapor deposition (CVD). The model is to be based on classical thermodynamics, mass transport, kinetic, nucleation, and growth theory. The model will be validated for two dispersed phase composite systems. One system will be boron nitride plus aluminum nitride. The other will be hafnium diboride plus silicon carbide. The BN + AlN system is of interest for radomes, windows, and tribological applications while HfB2 + SiC offers potential as a high temperature oxidation resistant material including oxidation protective coatings for carbon-carbon composites. Thermodynamic analyses of the BN + AlN and the HfB2 + SiC systems have been completed. These computerized studies indicate that both composite systems can be prepared by codeposition using commercially available, conventional reagents.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1987
Accession Number
ADA193849

Entities

People

  • Arlynn W. Smith
  • Garth B. Freeman
  • Geoving J. Gerard
  • John R. Thompson
  • W. J. Lackey

Organizations

  • Georgia Tech Research Corporation

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Carbon Carbon Composites
  • Ceramic Materials
  • Chemical Reactions
  • Chemical Vapor Deposition
  • Chemistry
  • Compound Semiconductors
  • Control Systems
  • Differential Equations
  • Heat Transfer
  • Materials
  • Materials Engineering
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Mechanical Properties
  • Physical Properties
  • Silicon Carbide

Fields of Study

  • Materials science

Readers

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