Vitreous and glass ceramic bodies
AssigneeNational Research Development Corporation
InventorsRonald William Jones, Peter William McMillan
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Abstract
A glass ceramic body having a microcrystalline interior and a relatively amorphous outer surface layer, the composition of said layer comprising ions of at least two alkali metals the ratio of the concentrations of which ions increases from said layer to said interior.
Claims5
A glass ceramic fiber of a diameter no greater than 50 microns having a crystalline interior and a relatively amorphous outer surface layer no greater than 500 A in thickness, said glass ceramic fiber containing a first alkali metal ion wherein the concentration of said first alkali metal ion decreases from the interior of said glass ceramic fiber to the amorphous surface layer, the ratio of total alkali metal ions and silica being maintained constant from said interior to said amorphous surface layer by a second alkali metal ion whose concentration decreases from said amorphous surface layer to said crystalline interior such that there is no interface between said interior and said surface layer.
Dependencies are inferred from the claim text.