Fabrication of Tantalum and Hafnium Carbide Fibers via ForcespinningTM for Ultrahigh-Temperature Applications

In this work, a novel method for producing ultrafine tantalum and hafnium carbide fibers using the ForcespinningTM technique via a nonhalide-based sol-gel process was investigated. An optimal solution viscosity range was systematically determined via rheological studies of neat PAN/DMF as a function...

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Bibliographic Details
Published in:Advances in materials science and engineering 2021-01, Vol.2021
Main Authors: Lee, Harold O., Caraballa, Patricia H., Bregman, Avi G., Bell, Nelson S., Nicholas, James R., Ringgold, Marissa, Treadwell, LaRico J.
Format: Article
Language:English
Subjects:
Alkoxides
Carbon
Ceramic fibers
Dielectric properties
Fibers
Hafnium carbide
Hydrofluorocarbons
Production methods
Rheological properties
Rheology
Rotation
Scanning electron microscopy
Silicon carbide
Sol-gel processes
Tantalum
Transition metals
Ultrafines
Viscosity
X ray powder diffraction
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Summary:In this work, a novel method for producing ultrafine tantalum and hafnium carbide fibers using the ForcespinningTM technique via a nonhalide-based sol-gel process was investigated. An optimal solution viscosity range was systematically determined via rheological studies of neat PAN/DMF as a function of fiber formation. Subsequently, ForcespinningTM parameters were also systemically studied to determine the optimal rotational velocity and spinneret-to-collecting rod distance required for ideal fiber formation. TaC and HfC fibers were synthesized via ForcespinningTM utilizing a mixture of PAN and refractory transition metal alkoxides (i.e., tantalum (V) ethoxide and hafnium (IV) tert-butoxide) in DMF solution based on optimal conditions determined from the neat PAN/DMF. In all instances after calcination, powder X-ray diffraction (PXRD) and energy dispersive spectroscopy (EDS) indicated that TaC and HfC fibers were produced. TGA/DSC confirmed the chemical stability of the resulting fibers.
ISSN:1687-8434
1687-8442
DOI:10.1155/2021/6672746