Method of making a cathode for an electron tube
AssigneeSamsung SDI Co., Ltd.
InventorsSung-hwan Moon, Dong-hee Han, Seung-kwon Han
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Abstract
A cathode for an electron tube and a preparing method therefor are provided. In the cathode for an electron tube having a base metal and an electron-emitting material layer, the particle size of the micro structure of the surface of the base metal is controlled to be in the range of 3 to 50 μm. The cathode for an electron tube has an excellent effect of diffusing intermediate products generated during the operation of the cathode, and is capable of consistently supplying a diffusion path of a reducing agent. Also, the cut off drift rate can be reduced, thereby attaining a long life span characteristic.
Claims8
a method of preparing a cathode for an electron tube, comprising:
- oxidizing a base metal by heating to a temperature of 300 to 1100° C. in an oxidating oxidizing atmosphere to form a metal oxide layer;
- dry reducing the base metal having the metal oxide by heating to a temperature of 500 to 1200° C. in a hydrogen atmosphere having a dew point kept at −50 to −90° C., to remove the metal oxide layer;
- and
- wet reducing the base metal by heating to a temperature of 500 to 1200° C. in a hydrogen atmosphere having a dew point kept at −10 to 40° C.
Dependencies are inferred from the claim text.