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Proceedings Paper

Melt processing of calcium aluminate fibers with sapphirelike infrared transmission
Author(s): Frederick T. Wallenberger; J. A. Koutsky; Sherman D. Brown
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Paper Abstract

X-ray amorphous, calcium aluminate glass fibers can be made by one of three melt processing methods. This review compares products and processes, and points to a potentially promising future. Selected amorphous fibers with 23-47% A1203 have high melt viscosities (>100 Pa-s) and can either be drawn from supercooled melts or spun above the liquidus through an orifice. The vast majority of fibers, especially those with 50-100% A1203 have low viscosities (<1 Pa-s) and can only be made by inviscid melt spinning, a process whereby the molten low viscosity jet is ejected through an orifice above the liquidus, and chemically stabilized in a reactive environment. As-spun fibers with 50-81% A1203 were x-ray amorphous and strong, but polycrystalline and weak with 82-100% A1203. Fibers by either process were aimed at structural uses (fiber reinforced composites). Recent work shows that x-ray amorphous fibers have sapphire-like infrared transmission spectra and have greater potential in optical than in structural applications. Thus new non-silica optical fibers can now be explored by any of the three processes; all promise to afford lower cost fibers at higher production rates than possible with slow processes (e.g., single crystal fiber growth) yielding costly specialty non-silica optical fibers (e.g., sapphire).

Paper Details

Date Published: 1 November 1991
PDF: 11 pages
Proc. SPIE 1590, Submolecular Glass Chemistry and Physics, (1 November 1991); doi: 10.1117/12.50218
Show Author Affiliations
Frederick T. Wallenberger, E.I. du Pont de Nemours & Co., Inc. (United States)
J. A. Koutsky, Univ. of Wisconsin (United States)
Sherman D. Brown, Univ. of Illinois/Urbana (United States)

Published in SPIE Proceedings Vol. 1590:
Submolecular Glass Chemistry and Physics
Phillip Bray; Norbert J. Kreidl, Editor(s)

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