Sd. Nunn et al., SUSPENSION DRY SPINNING AND RHEOLOGICAL BEHAVIOR OF CERAMIC-POWDER-LOADED POLYMER-SOLUTIONS, Journal of the American Ceramic Society, 76(10), 1993, pp. 2460-2464
Green ceramic fibers of Al2O3, Si3N4, Ce-ZrO2, and SiC were prepared b
y suspension dry spinning of powder-loaded polymer solutions. The fibe
r-forming polymer was ethyl methacrylate dissolved in methyl ethyl ket
one. The experimental conditions for fiber formation were defined for
the alumina system. Thread lengths measured as a function of extrusion
rate showed a transition from capillary-limited fracture to continuou
s fibers in agreement with Ziabicki's theory of thread formation. The
conditions for spinnability were correlated to rheological parameters.
Spinnable Al2O3 dopes were elastic fluids with a high viscosity (60 P
a.s at 0.46 s-1) under the conditions of this study.