The Microstructure of Ceramic Powders and Fibers Produced by Supercritical Fluid Methods

Abstract

The rapid expansion of supercritical fluid solutions (RESS) process was investigated for the production of ceramic and preceramic, fibers, and films. The RESS process involves the extremely rapid nucleation of a low vapor pressure solute, present as dispersed molecular species in a supercritical fluid solvent, during expansion of the supercritical solution across a small orifice. Specific morphologies of the solute after expansion were found to be dependent on the processing conditions employed during the RESS expansion and product collection. RESS was investigated as a method for processing a range of ceramic and preceramic materials using a variety of supercritical fluid solvents. Products obtained by this process included nanometer to micrometer scale fine powders, submicrometer thick continuous films, and fine polymer fibers having high aspect ratios.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1989
Accession Number
ADA209109

Entities

People

  • Dean W. Matson
  • Kenneth A. Norton
  • Richard D. Smith
  • Swami V. Raman

Organizations

  • Pacific Northwest National Laboratory

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Aspect Ratio
  • Carbon Dioxide
  • Chemistry
  • Classification
  • Films
  • Fluids
  • Materials
  • Materials Processing
  • Materials Science
  • Nucleation
  • Particles
  • Physical Properties
  • Powders
  • Production
  • Security
  • Solvents
  • Vapor Pressure

Readers

  • Aerosol Science/Aerosol Physics
  • Organic Chemistry
  • Thin Film Deposition Science.