Glass composition with low coefficient of thermal expansion, and glass fiber produced from same

Abstract

The present disclosure relates to a glass composition having a low thermal expansion coefficient, specifically, a glass composition comprising about 55 to less than 64 weight percent of silicon oxide, about 15 to about 30 weight percent of aluminum oxide, about 5 to about 15 weight percent of magnesium oxide, about 3 to about 10 weight percent boron oxide, about 0 to about 11 weight percent calcium oxide, and about 0 to about 2 weight percent of alkali oxide, the remainder being trace compounds of less than about 1 weight percent, is provided. Glass fibers and composite articles formed therefrom are also provided.

Description

technical field [0001] The present invention relates to glass compositions having a low coefficient of thermal expansion, and to a continuous process for producing glass fibers from said glass compositions. Background technique [0002] Many conventional glasses with a low coefficient of thermal expansion are generally of the "borosilicate glass class". Borosilicate glass has a low coefficient of thermal expansion, which is about one-third to one-half that of many boron-free silicate glasses. Typically, these borosilicate glass compositions are: about 70-80% by weight silica, 10-15% by weight boron oxide, up to 8% by weight sodium oxide, up to 8% by weight potassium oxide and small amounts of Calcium Oxide (Lime) and Aluminum Oxide. Borosilicate glass is known for its excellent thermal stability (low coefficient of thermal expansion). This is mainly due to their relatively high silica and boria content. However, also for this reason, these glasses are relatively difficul...

AI Technical Summary

Problems solved by technology

While S-glass can provide properties suitable for these applications, it is difficult to process continuously due to process constraints with low "hollow filament" counts (there is no long internal hollow region in the fiber, such long internal Hollow regions are easily formed by trapped air bubbles or seeds) S-glass

On the one hand, E-glass fibers and L-glass fibers have very low hollow fiber counts, but rather poor thermal expansion compatibility behavior and low elastic modulus

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