SETT ATT BEHANDLA RORFORMIGA METALLINLEGG FOR FLERGLASRUTOR

摘要

Method for processing glass coated tubular metal inserts for use in forming apertures employed in the manufacture of all-glass multiple sheet glazing units. The surface of the metal inserts are first cleaned and then their outer surfaces are prepared to receive a layer of glass frit by tumbling in sand. The layer of glass frit is physically adhered to the clean outer surface by tumbling the inserts in small pieces of glass. According to the invention, the glass frit-coated inserts are then treated at elevated temperatures by first degassing the glass frit layers in a vacuum, oxidizing the outer surface of the metal inserts at a temperature below the sintering temperature of the glass frit in an oxygen-inert gas atmosphere, and heating the glass frit at a temperature above the softening point thereof in an inert atmosphere to sinter and bond the glass layer to the metal inserts.