Melt processing of calcium aluminate fibers with sapphirelike infrared transmission

Frederick T. Wallenberger; J. A. Koutsky; Sherman D. Brown

doi:10.1117/12.50218

1 November 1991 Melt processing of calcium aluminate fibers with sapphirelike infrared transmission

Frederick T. Wallenberger, J. A. Koutsky, Sherman D. Brown

Proceedings Volume 1590, Submolecular Glass Chemistry and Physics; (1991) https://doi.org/10.1117/12.50218
Event: OE Fiber, 1991, Boston, MA, United States

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).

Citation Download Citation

Frederick T. Wallenberger, J. A. Koutsky, and Sherman D. Brown "Melt processing of calcium aluminate fibers with sapphirelike infrared transmission", Proc. SPIE 1590, Submolecular Glass Chemistry and Physics, (1 November 1991); https://doi.org/10.1117/12.50218

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