| 摘要 |
PURPOSE:To make it very easy to provide silver, by coating the glass stem of an electrode with a mixed silver oxide paste comprising a silver oxide, a lead borate and a solvent, and by heating the paste to make a coating silver film. CONSTITUTION:A silver oxide, a lead borate and glycerin are mixed together to prepare a mixed silver oxide paste 44. The surface of the glass stem 34 of each electrode 3 is coated with the paste 44 and then dried at a temperature of about 100 to 150 deg.C. The electrodes 3 are put in a U-shaped inner tube 2 whole interior is an integral opening. The tube 2 is put on an end plate 5. A thin glass pipe 7 for gas evacuation is inserted into the end plate 5. An outer tube 1 is then put on the end plate 5. These members are thereafter put in a heating furnace and heated under an atmosphere of about 470 deg.C for about 5min so that the electrodes 3, the inner tube 2 the outer tube 1 are hermetically secured to the end plate 5 by frit 6, the silver oxide provided on the glass stems 34 of the electrodes is reduced to silver 4, and the lead borate is molten. The glass stems 34 are thus coated with films of the silver 4.
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