Accession Number:

AD0272788

Title:

HIGH VISCOSITY REFRACTORY FIBERS

Descriptive Note:

Corporate Author:

BJORKSTEN RESEARCH FOUNDATION MADISON WIS

Personal Author(s):

Report Date:

1962-02-01

Pagination or Media Count:

1.0

Abstract:

It was demonstrated in C glass, E glass, and silica that the viscosity of vitreous materials was increased by admixture of fine dispersions of insoluble, nonreactive, refractory materials. The effect was too large to be accounted for by volume immobilization and appeared to be due mainly to frictional forces between additive particles. Evidence was obtained that insoluble nonreactive additives, which were molten instead of solid, would also increase viscosity, provided the particle size was sufficiently fine. With vitreous reinforcing fibers aligned with the flow of heat, color in the fibers was shown to improve the thermal shielding afforded by the composite layer. Marked increases in the ablation resistance if silica through the additions of various additives appeared to be the result of cooling effects associated with the generally increased emissivities of the silica-additive mixtures. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE