| 摘要 |
PURPOSE:To omit or simplify the removal of an unnecessary oxide film and machining of an unnecessary part by constituting specifically a Cr-contg. sealing alloy plate to be used for an electrode, etc., for a display tube of a display, etc., in the stage of working said alloy plate to a required size and shape then subjecting the plate to a preliminary oxide film treatment. CONSTITUTION:Metallic or alloy plates 2 of a required size which do not form an oxide film by the preliminary oxide film treatment are welded and juxtaposed by welding on both sides on the thickness side of the sealing alloy plate 1 having the required size to form a sheet of the composite alloy plate in the stage of producing the electrode for the display tube. The composite ally plate is blanked or etched to the required size and shape. The plate 2 is then subjected to the preliminary oxidation treatment at 1,000-1,250 deg.C in a wet H2 atmosphere of dew point +10 deg.C -+40 deg.C if said plate is an Fe-30-50% Ni alloy plate, Fe, Ni metal or alloy. The plate 2 is subjected to the preliminary oxidation treatment at 1,000-1,050 deg.C in the above-mentioned atmosphere if the plate is copper or copper alloy. The formation of the oxide film on the surface of the plate 2 is thus obviated and glass 4 is sealed to the plate 1 part where the oxide film 3 is formed and deposited.
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