Green ceramic fibers of Al 2 O 3 , Si 3 N 4 , Ce‐ZrO 2 , and SiC were prepared by suspension dry spinning of powderloaded polymer solutions. The fiber‐forming polymer was ethyl methacrylate dissolved in methyl ethyl ketone. 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 continuous fibers in agreement with Ziabicki's theory of thread formation. The conditions for spinnability were correlated to rheological parameters. Spinnable Al 2 O 3 dopes were elastic fluids with a high viscosity (60 Pa·s at 0.46 s −1 ) under the conditions of this study.
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Nunn et al. (1993) studied this question.
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