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Inviscid melt spinning: As-spun crystalline alumina fibers

Published online by Cambridge University Press:  31 January 2011

F. T. Wallenberger ,
N. E. Weston  and
S. A. Dunn
F. T. Wallenberger*
Affiliation:
E. I. Du Pont de Nemours and Company, Fibers Department, P. O. Box 80302, Wilmington, Delaware 19880-0302
N. E. Weston
Affiliation:
Consultant, formerly Micron, Inc., Analytical Services Laboratory, Wilmington, Delaware 19805
S. A. Dunn
Affiliation:
University of Wisconsin, Department of Chemical Engineering, Madison, Wisconsin 53706
*
a)Address correspondence to this author.
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Abstract

Inviscid melt spinning yielded the first crystalline alumina fibers directly from the melts. In this experimental process, a liquid jet having a melt viscosity of <101 poise (vs>104 for fiberglass) is extruded into propane and is thus chemically stabilized (vs rapidly quenched) before it forms Rayleigh waves and breaks up into droplets. This letter describes a 65.5% alumina-zirconia fiber, an 81.5% and a 90.6% alumina-calcia fiber, a 98.6% alumina-magnesia fiber, and a 100% alumina fiber. The δ-allomorph was identified as the crystalline phase of the melt spun 100% alumina fibers, compared to the α-allomorph reported for FIBER FP, a slurry spun and sintered 100% alumina fiber.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 11 , November 1990 , pp. 2682 - 2686
Copyright
Copyright © Materials Research Society 1990

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References

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