Calcium aluminate glass fibers: drawing from supercooled melts versus inviscid melt spinning
- 31 July 1991
- journal article
- Published by Elsevier BV in Materials Letters
- Vol. 11 (8-9), 229-235
- https://doi.org/10.1016/0167-577x(91)90192-9
Abstract
Calcium aluminate melts with 35–50%/wt. alumina and some silica as a network former can have viscosities high enough to facilitate the drawing of fibers from supercooled melts. Strong fibers could also be drawn from the melt of a non-silica calcium aluminate glass with a quaternary composition; thus silica is not necessarily required as a viscosity builder. Calcium aluminate melts with 50–80% alumina have much lower viscosities. Fibers cannot be drawn from these melts, but they can be spun if a low-viscosity (inviscid) jet is ejected through an orifice into propane, a reactive medium that chemically stabilizes the jet. A carbon sheath (coating) is formed on the fiber surface under most, but not all, process conditions. This Letter shows for the first time that a carbon sheath significantly improves the hydrolytic stability of the resulting fibers.Keywords
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