| 摘要 |
PURPOSE:To suppress the occurence of cracks in the electrode fixing part by making an electrode a sintered type electrode of a high melting point metal and an electron emitting material, and further by using a part in which said sintered type electrode and an enclosed body made of conductive ceramic are molded and sintered into one block. CONSTITUTION:A small quantity of binder is added to a mixture of approximately 85% alumina and 15% tungsten in weight ratio and after mixing, it is pressed to obtain a compression-molded body 2A as an enclosed body. In the next step a small quantity of binder is added to another mixture of approximately 75% of tungsten and 25% of tungstic acid barium calcium in weight ratio and after mixing, it is pressed to obtain a compression-molded body 4A of a sintered electrode in which a head part 4a of a large diameter and a shaft part 4b are unified. And then a recess 2b is provided on the compression-molded enclosed body 2A and the base end part of the shaft part 4b of the compression-molded body 4A of the sintered electrode is inserted into the recess 2b and fixed. When teh aforementioned assembly is heated in a hydrogen atmosphere, it is sintered and an assembly in which the enclosed body 2 of conductive ceramic and the sintered type electrode are formed in a block is obtained. Thereby, leakage troubles caused by cracks on the enclosed body are prevented.
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