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Proceedings Paper

Melt-processed calcium aluminate fibers: structural and optical properties
Author(s): Frederick T. Wallenberger; Norman E. Weston; Sherman D. Brown
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Paper Abstract

This paper compares melt processed calcium aluminate fibers from two technologies in terms of their optical and structural properties. Strong amorphous fibers with a modulus 15-16 Mpsi (vs. 9-12 Mpsi for silica fibers) can be drawn from quaternary, low-silica calcium aluminate melts with 42-44%/wt. Al2O3, <6% SiO2, and <5% MgO, and from quaternary, non-silica Ca aluminate melts with 46% Al2O3, 4% MgO, and 14% BaO. These fibers have excellent structural properties. Amorphous Ca aluminate melts with 51.5-80.2% Al2O3 (both with and without silica) have much lower viscosities. They cannot be drawn from supercooled melts, but can be spun, by inviscid melt spinning, whereby a low viscosity jet is ejected into propane, affording chemically induced jet stabilization. These fibers were weaker, but were found to have sapphire-like infrared transmission spectra. A carbon sheath from the pyrolytic decomposition of propane was formed on the surface of most spun fibers. It acted like a hermetic coating and was found to significantly enhance the hydrolytic stability of the fibers.

Paper Details

Date Published: 1 August 1991
PDF: 9 pages
Proc. SPIE 1484, Growth and Characterization of Materials for Infrared Detectors and Nonlinear Optical Switches, (1 August 1991); doi: 10.1117/12.46516
Show Author Affiliations
Frederick T. Wallenberger, E.I. du Pont de Nemours & Co., Inc. (United States)
Norman E. Weston, Consultant (United States)
Sherman D. Brown, Univ. of Illinois/Urbana-Champaign (United States)

Published in SPIE Proceedings Vol. 1484:
Growth and Characterization of Materials for Infrared Detectors and Nonlinear Optical Switches
Randolph E. Longshore; Jan W. Baars, Editor(s)

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