ALUMINA-BASED SINTERED COMPACT FOR ELECTRON GUN

PURPOSE: To make the potential gradient across respective cylindrical electrodes gentle by connecting the respective cylindrical electrodes of an electron gun with a sintered compact having a composition consisting essentially of alumina and a specific oxide added thereto. CONSTITUTION: This alumina...

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Hauptverfasser:	HAYASHI MASAKI, MUCHI TSUNEO
Format:	Patent
Sprache:	eng
Schlagworte:	ARTIFICIAL STONE BASIC ELECTRIC ELEMENTS CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS ELECTRICITY LIME, MAGNESIA METALLURGY REFRACTORIES SLAG TREATMENT OF NATURAL STONE
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Beschreibung
Zusammenfassung:	PURPOSE: To make the potential gradient across respective cylindrical electrodes gentle by connecting the respective cylindrical electrodes of an electron gun with a sintered compact having a composition consisting essentially of alumina and a specific oxide added thereto. CONSTITUTION: This alumina-based sintered compact for an electron gun comprises 70-96wt.% alumina, 1-20wt.% titanium oxide, 0.1-1.0wt.% vanadium pentoxide and at least one (preferably 3.0-20.0wt.%) of calcium oxide, chromium oxide, cobalt oxide, magnesium oxide, silica, manganese oxide and iron oxide as the remainder. The sintered compact has 1×10 to 1×10 Ωcm volume resistivity within the temperature range of 25-75 deg.C and further