The Microstructure of Ceramic Powders and Fibers Produced by Supercritical Fluid Methods
Final rept. 15 Feb 1986-14 Feb 1989
PACIFIC NORTHWEST NATIONAL LAB RICHLAND WA CHEMICAL SCIENCES DEPT
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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.
- Ceramics, Refractories and Glass