Accession Number:

ADA209109

Title:

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

Descriptive Note:

Final rept. 15 Feb 1986-14 Feb 1989

Corporate Author:

PACIFIC NORTHWEST NATIONAL LAB RICHLAND WA CHEMICAL SCIENCES DEPT

Report Date:

1989-03-01

Pagination or Media Count:

6.0

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.

Subject Categories:

  • Ceramics, Refractories and Glass

Distribution Statement:

APPROVED FOR PUBLIC RELEASE