ELECTRIC DISCHARGE TUBE AND METHOD OF MANUFACTURING AN ELECTRICALLY CONDUCTIVE LAYER ON A WALL PORTION OF THE ENVELOPE OF SUCH A TUBE

摘要

"Electric discharge tube and method of manufacturing an electrically conductive layer on a wall portion of the envelope of such a tube". An electrically conductive layer on a wall portion of the envelope of an electric discharge tube which comprises an electrically conductive material and at least 5% by weight of silicon dioxide as an adhesive, adheres readily, is hard and can be washed with water. Such a layer can be obtained from a suspension comprising an electrically conductive material and a binder in a solvent, in which the binder is a quarternary ammonium silicate or a solution of silicon dioxide (SiO2) in phosphoric acid (H3PO4), in which the mol ratio SiO2/P2O5 is between 0.3:1 and 20:1.