C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
261/18, 49/9
C03B 37/00 (2006.01)
Patent
CA 1069543
ABSTRACT OF THE DISCLOSURE An improved method of preparing a fiberizable borosi- licate glass composition is presented. The constituents of the glass composition are classified into two or more melting groups according to mutual melting properties or characteristics such as volatility, corrosiveness or fusion point. Of the constituent groups one is selected and prepared as a molten host glass com- position into which the remaining groups are sequentially intro- duced and homogenized, forming a molten glass composition of desired forming characteristics. The ingredients for the host glass are pellitized and pre-heated in pellet form to a tempera- ture which is just below the fusion temperature of the host glass composition and that which the pellets will not agglomerate. The heated pellets are melted in a generally horizontally-disposed, continuous-flow main melter. The molten host glass from the main melter is flowed to a location where glass fibers are formed. A B2O3- containing additive glass is separately melted and combined (below the surface of the molten host glass and with mechanical mixing) with a larger portion of the molten host glass prior to the fiber-forming location, to give a fiberizable borosilicate glass. Borosilicate glass fiber is formed at the fiber-forming location. At least a major proportion of the B2O3 content of the fiber is supplied by the additive glass, so that the main melter exhibits longer life and the volatilization losses of B2O3 are substantially less than that which results when melting the ingredients of the additive and host glass together in the melter.
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